New genera and species of Urothoidae (Amphipoda) from the Brazilian deep sea, with the re-assignment of Pseudurothoe and Urothopsis to Phoxocephalopsidae

Box-corer samples taken between 700 and 2000 m depth on the slope of the Campos Basin, southeastern Brazilian deep sea, provided the material for the description of two new genera in the family Urothoidae, Carangolioides gen. nov. and Coronaurothoe gen. nov., and three new species: Carangolioides castellatus sp. nov., Carangolioides hamatus sp. nov. and Coronaurothoe rotunda sp. nov. Carangolioides gen. nov. differs from other urothoid genera by the presence of a distolateral projection on the outer lobes of the lower lip and the distally truncated margin of the upper lip, while Coronaurothoe gen. nov. differs by the mandibular molar being triturative with a distal crown of stout setae. In this study, we provide detailed descriptions and illustrations of the new taxa. An identification key to genera of Urothoidae is also provided. The genera Pseudurothoe Ledoyer, 1986 and Urothopsis Ledoyer, 1967 are removed in this paper from Urothoidae to Phoxocephalopsidae. http://zoobank.org/urn:lsid:zoobank.org:pub:18863639-4F10-4E25-9C62-8B1047538046


Introduction
The family Urothoidae Bousfield, 1978 comprises small, ranging from 2 mm to 10 mm in length, exclusively marine amphipods, highly adapted to a fossorial lifestyle (Bousfield 1982). Urothoid species are densely setose and spinose, displaying broad bodies and appendages modified for burrowing. They are commonly recognized by the following: antenna 1 geniculate between articles 2 and 3 of the peduncle, gnathopods 1 and 2 subchelate, pereopod 7 phoxocephalid-like, shorter than pereopod 6, with basis posteriorly expanded, and a deeply cleft telson (Barnard and Drummond 1979).

Removed genera
Pseudurothoe Ledoyer, 1986 andUrothopsis Ledoyer, 1967 are transferred here to Phoxocephalopsidae Barnard and Clark, 1982. Remarks Until now, the family Urothoidae included three monotypic genera: Cunicus, Pseudurothoe and Urothopsis; the last two genera are now removed to Phoxocephalopsidae. Carangolia comprises four described species, Urothoides 10 species and Urothoe, which is the most speciose, 44 species. Most taxonomic studies dedicated to this group in the past commonly have neither illustrations nor descriptions of mouthparts. In this study, we detail these structures, which have become essential for the separation of the species, and which have been used to establish the two new genera described herein. Another important aspect of urothoid taxonomy is that only a small number of structures have been illustrated and often the descriptions are short or poorly detailed, as in Chevreux and Fage (1925), Gurjanova (1951), Lincoln (1979) and Bellan-Santini (1989), making it difficult to recognize the species. The biggest taxonomic problem in the family Urothoidae involves the genus Urothoe, because it has a large number of species and some variation in the character states. In the original description of Dana (1852) only a few features were used, including: gnathopods 1 and 2 slender, subchelate, and similar; antenna 1 shorter than antenna 2; maxillipeds long and slender, with inner plate small; uropod 3 rami foliaceous; and telson deeply cleft. Only the uropod 3 with foliaceous rami is an exclusive feature of the genus, which makes it a weakly defined group. Many species displaying features described above were grouped into Urothoe, resulting in a taxon with wide morphological variation. These facts suggest that Urothoe might be, actually, a non-monophyletic group. Currently, Urothoe is in great need of an extensive revision, and a more restricted diagnosis for it must be established. Still, in this work it has been possible to establish two new genera supported by clear and well-defined characters. The diagnostic characters of the genera included in Urothoidae are presented in Table 1.

Etymology
The name Carangolioides refers to the morphological similarity of this genus to Carangolia. Gender masculine.

Remarks
Carangolioides gen. nov. differs from the other genera previously described in the family by the upper lip with distal margin truncated and lower lip with distolateral projection on the outer lobe.
The new genus is similar to Carangolia by the globular shape of the body, pereopods 3 and 4 similar to each other, with marginal and facial stout setae on carpus and propodus, and the extremely enlarged mandible with incisor strongly developed. However, in Carangolioides gen. nov. the accessory flagellum on antenna 1 is short, but well developed, molar and lacinia mobilis are present, and the telson is longer than wide.
The studies of Barnard (1961) and Bellan-Santini and Ledoyer (1986) do not present complete descriptions and illustrations of the type materials, besides the lack of details of their mouthparts, which makes it difficult to determine the character variations of the mouthparts of Urothoidae. To establish the states of those characters, the studies of Barnard (1962) and Jaume and Sorbe (2001) were used, with complete descriptions of the type species Carangolia mandibularis Barnard, 1961

Etymology
The species name is an adjective, derived from the Latin word castellum, and refers to the posterior margin of the pereopod 5 basis, which is castellated.

Diagnosis
Rostrum present; head anteroventral angle rounded. Mandible lacinia mobilis reduced to a robust seta. Gnathopod 1 palm subequal in length to posterior margin of propodus. Gnathopod 2 palm shorter than posterior margin of propodus. Coxa 4 posterior margin straight. Pereopod 5 basis with posterior margin castelloserrate. Coxa 6 and 7 posteroventral margin lobate. Epimeral plate 3 posteroventral corner produced, apically rounded. Uropods 1 and 2 rami naked. Uropod 3 short and robust, outer ramus article 1 about twice as long as article 2. Description Head: eyes absent; rostrum absent; anteroventral corner rounded. Antenna 1 peduncular article 1 naked; primary flagellum 4-articulate, 1.25 times longer than peduncular article 3; accessory flagellum present, 3-articulate. Antenna 2 reaching end of peduncular article 2 of antenna 1; peduncular article 4 longer and stouter than article 5, both with two and three slender setae, respectively, on anterior margin, and with a row of eight and four robust setae, respectively, on posterior margin. Upper lip truncate distally. Mandible molar present, non-triturative; lacinia mobilis of both left and right simple and spiniform; accessory setal row absent; incisor process well developed of medium length and smooth; palp article 2 shorter than article 3 (0.6 times), with two marginal setae; article 3 with four distal long setae. Lower lip outer lobes with distolateral projection. Maxilla 1 inner plate with one subdistal seta and three distal pappose setae; outer plate with nine robust setae; article 1 of palp 1.8 times longer than article 2; article 2 with three distal pappose setae. Maxilla 2 outer plate wider than inner plate, both with long setae on distal margin. Maxilliped inner plate with three apical robust setae, outer plate reaching two-thirds of palp article 2, with seven marginal robust setae; palp article 2 expanded, 1.65 times longer than wide, inner distal margin produced, inner margin densely setose; article 3 expanded distally; article 4 0.65 times the length of article 3, with two slender distal setae. Gnathopod 1 coxa rectangular, twice as long as wide, anteroventral angle rounded and posteroventral angle notched; basis long and slender, widened distally, anterior margin with four long setae, posterior margin with seven long setae; carpus subequal to propodus, posterior margin slightly lobate and densely setose; propodus with a seta on anterodistal angle; palm acute, sinuous, longer than posterior margin, with five long setae and one robust seta near palmar corner; dactylus moderately stout, longer than propodus. Gnathopod 2 coxa rectangular, about twice as long as wide, anteroventral and posteroventral angles rounded; basis long and slender, widened distally, posterior margin with 11 long setae; carpus slightly longer than propodus, posterior margin slightly lobate and densely setose; propodus outer surface not densely setose; palm almost transverse, shorter than outer margin, with one robust seta on palmar corner; dactylus moderately stout, subequal to propodus. Pereopod 3 coxa 1.6 times longer than wide; basis 1.8 times longer than wide; merus with a seta at anterodistal angle, shorter than propodus and carpus together; carpus robust 1.2 times longer than wide, with nine robust setae on posterior margin; propodus slightly more slender than carpus, with two rows of four robust setae on both inner and outer margins of posterior margin; dactylus short, 0.8 times propodus length. Pereopod 4 coxa 1.25 times longer than wide, posterior margin not excavate with posteroventral angle not produced; basis twice as long as wide, with six long setae posterior margin; merus shorter than propodus and carpus together; carpus robust, 1.3 times longer than wide, with six robust and three slender setae on posterior margin and a row of four facial robust setae; propodus slightly more slender than carpus, with two rows of four and three robust setae on both inner and outer margin of posterior margin, respectively; dactylus short, 0.8 times propodus length. Pereopod 5 coxa 1.2 times wider than long, with posteroventral lobe produced; basis ovate, as long as wide, posterior margin castelloserrate with three long setae; merus as long as wide, posterodistal angle with one seta; carpus 1.2 times longer than wide, anterior margin with two combs of robust setae (4-4), posterior margin with two combs of robust setae (4-6); propodus about as long as carpus, 1.7 times longer than wide, anterior margin with five long setae, posterodistal angle with one comb of three robust setae; dactylus styliform, 1.2 times longer than propodus. Pereopod 6 coxa slightly wider than long, with produced posteroventral lobe; basis ovate, 1.2 times longer than wide, posterior margin smooth with a row of four very long plumose facial setae; merus 1.3 times longer than wide, anterior margin with four slender setae, posterior margin with six slender setae; carpus 1.8 times longer than wide, anterior margin with two combs of slender setae (4-4); propodus shorter than carpus, 0.6 times longer than wide, anterior margin with two combs of slender setae (3-5); dactylus as long as propodus. Pereopod 7 coxa as long as wide, with posteroventral lobe produced; basis ovate, 1.25 times longer than wide, posterior margin sinuous lacking setae; merus slightly longer than wide, anterior margin with three slender setae, posterodistal angle with two slender setae; carpus 1.75 times longer than wide, anterior margin with one comb of four slender setae, posterior margin with two medial slender setae, posterodistal angle with five slender setae; propodus 1.4 times shorter than carpus, 1.6 times longer than wide, anterior margin with one medial comb of four slender setae, distal margin with six slender setae; dactylus subequal to propodus. Epimeral plate 1: ventral margin with two long setae; posteroventral angle acute and slightly produced. Epimeral plate 2: ventral margin with one pappose seta; posteroventral angle acute and slightly produced. Epimeral plate 3: ventral margin lacking setae, posteroventral angle strongly produced into blunt process. Uropod 1: peduncle 1.2 times longer than rami, inner margin with one robust seta, anterodistal angle with one stout seta, posterodistal angle with robust setae; inner ramus subequal to outer ramus, both rami naked. Uropod 2: peduncle 0.7 times as long as rami, inner margin with one robust seta, inner distal angle with one stout seta, outer distal angle with robust setae; inner ramus subequal in length to outer ramus, both rami naked. Uropod 3 about 0.7 times the uropod 2 length and 0.6 times as long as uropod 1, peduncle as long as wide, and subequal in length to outer ramus, distomedial angle with one plumose seta, distolateral angle with one robust seta; rami foliaceous and stubby; inner ramus shorter than article 1 of outer ramus, with one long seta on inner margin, and one distal pappose seta; outer ramus 2-articulate, article 1 twice as long as article 2, distolateral angle with one robust seta; article 2 with two distal pappose setae. Telson deeply cleft (up to 70% length), lateral margins each with one short, slender seta; distal margin of each lobe weakly incised and with one robust seta.

Variation
The antenna 1 flagellum varies from 4-to 5-articulate. The distolateral corner of pereopod 6 basis has four to nine pappose setae. The epimeral plates 1 and 2 also present variation in number of setae on their ventral margins.

Remarks
Carangolioides castellatus gen. et sp. nov. is easily distinguished from C. hamatus gen. et sp. nov. by the following: the anteroventral unproduced angle of the head, in contrast to the acute projected angle observed in C. hamatus (which slightly overlaps the anteroventral margin of the head in the illustration); the unproduced posterior margin of coxa 4, in contrast to the sinuous coxa 4, with a posterodistal subacute projection in C. hamatus; the posteroventral corner of epimeral plate 3 produced in an apically rounded process, versus the posteroventral corner produced in an acute upward hook, in C. hamatus; and the lacinia mobilis reduced to a stout seta, in contrast to the well-developed and multicuspidate lacinia mobilis present in C. hamatus. In addition, the naked rami and sparsely armed peduncle of uropod 1 of C. castellatus differ markedly from the heavily armed uropod 1 of C. hamatus.

Geographic distribution
Known only from the type locality, Campos Basin, off Rio de Janeiro State coast.

Bathymetric range
Collected at 750 m depth.

Etymology
The species name is a Latin adjective hamatus (hooked), and refers to the hookshaped posteroventral corner on the epimeral plate 3. posteroventral angle produced into a large hook. Uropod 1 and 2 rami with robust setae.

Description
Head without eyes; rostrum absent; anteroventral corner produced into a curved acute and long spine. In the illustration this projection slightly overlaps the anteroventral margin of the head. Antenna 1 peduncular article 1 with five slender setae on posterior margin; primary flagellum 5-articulate and subequal in length to peduncular article 3; accessory flagellum present, 3-articulate. Antenna 2 reaching end of peduncular article 2 of antenna 1; peduncular article 4 longer and stouter than article 5, with row of 14 robust setae on anterior margin, and row of seven long setae on lateral surface; article 5 with row of nine robust setae on anterior margin, and two long setae on posterior margin. Mandible molar present, non-triturative; right mandible lacinia mobilis 5-dentate; left lacinia mobilis bifid, accessory setal row present, with four simple setae; incisor process well developed, of moderate length and smooth; palp article 2 longer than article 3, with three marginal setae; article 3 with one subdistal and six distal long setae. Maxilla 1 inner plate with three distal pappose setae; outer plate with nine robust setae; palp article 1 1.6 times longer than article 2; article 2 with three distal pappose setae. Maxilla 2 outer plate wider than inner plate, both with long setae on distal margin. Maxilliped inner plate with three apical robust setae, outer plate reaching two-thirds of palp article 2, with seven marginal robust setae; palp article 2 expanded, 1.8 times longer than wide, distomedial margin produced, medial margin densely setose; article 3 widened distally; article 4 half length of article 3, with a slender distolateral seta. Gnathopod 1 coxa rectangular, longer than wide (2.5 times), anteroventral angle rounded and posteroventral angle about 90°; basis long and slender, widened distally, posterior margin with four long setae, facial margin with two combs of long setae (5-7); carpus slightly longer than propodus, posterior margin slightly lobate and densely setose; propodus with a tuft of setae on anterodistal angle; palm acute, longer than outer margin, with six long setae and one robust seta near palmar corner; dactylus stout, longer than propodus. Gnathopod 2 coxa rectangular, longer than wide (2.4 times), anteroventral angle rounded and posteroventral angle about 90°; basis long and slender, widened distally, posterior margin with 16 long setae, facial margin with five long setae; carpus slightly longer than propodus, posterior margin not lobate and densely setose; propodus facial margin densely setose; palm acute, longer than outer margin, with eight long setae defining palmar corner; dactylus moderately stout, as long as palm. Pereopod 3 coxa longer than wide (1.8 times), with two setae on posteroventral angle; basis 2.3 times longer than wide, with one seta on posterodistal angle; merus with a row of oblique and facial setae, longer than propodus and carpus together; carpus robust 1.1 times longer than wide, with nine robust and long setae on posterior margin; propodus more slender than carpus, with five robust setae on posterior margin; dactylus short, 0.7 times propodus length. Pereopod 4 coxa longer than wide (1.2 times), posterior margin excavate with posteroventral angle produced into an acute process; basis 2.6 times longer than wide, with three plumose setae on posterodistal angle; merus with a row of oblique and facial setae, longer than propodus and carpus together; carpus robust 1.25 times longer than wide, with nine robust and long setae on posterior margin; propodus more slender than carpus, with seven robust setae on posterior margin; dactylus short, 0.9 times propodus length. Pereopod 5 coxa wider than long (1.2 times), with posteroventral lobe produced; basis ovate, longer than wide (1.4 times), posterior margin smooth with five long setae; merus as long as wide, posterodistal angle with a very long plumose seta and one short seta; carpus 1.3 times longer than wide, anterior margin with two combs of robust setae (7-6), posterior margin with two combs of setae , posterodistal angle with three very long setae; propodus as long as carpus, 2.3 times longer than wide, anterior margin with one proximal comb of two robust setae and one middle and distal combs of slender setae (3-3), posterior margin with one comb of robust setae (3), posterodistal angle with two slender setae; dactylus styliform, 1.1 times longer than propodus. Pereopod 6 coxa wider than long (1.4 times), with posteroventral lobe slightly produced; basis ovate, longer than wide (1.3 times), posterior margin smooth with a row of 11 facial very long plumose setae; merus longer than wide (2.3 times), anterior margin with nine slender setae, posterior margin with seven slender setae and one robust seta on posterodistal angle; carpus 2.1 times longer than wide, anterior margin with three combs of slender setae (2-2-7), posterodistal angle with six slender setae; propodus as long as carpus, 2.2 times longer than wide, anterior margin with one middle comb of three slender setae, distal margin with five slender setae; dactylus short, 0.8 times longer than propodus. Pereopod 7 coxa wider than long (1.3 times), with posteroventral lobe not produced; basis ovate, longer than wide (1.25 times), posterior margin smooth, lacking setae; merus longer than wide (1.2 times), anterior margin with four slender setae, posterior margin with two combs of slender setae (2-5); carpus 2.4 times longer than wide, anterior margin with three combs of slender setae (2-2-7), posterodistal angle with six slender setae; propodus as long as carpus, 2.2 times longer than wide, anterior margin with one middle comb of three slender setae, distal margin with five slender setae; dactylus short, 0.8 times of propodus length.
Epimeral plate 1 ventral margin with four pappose setae; posteroventral angle acute. Epimeral plate 2 ventral margin with four pappose setae; posteroventral angle acute and slightly produced. Epimeral plate 3 ventral margin lacking setae, posteroventral angle strongly produced into an upturned acute spine. Uropod 1 peduncle shorter than rami (0.7 times), both inner and outer margins with four robust setae; inner ramus slightly shorter than outer ramus, with two medial robust setae; outer ramus with three robust setae. Uropod 2 peduncle shorter than rami (0.8 times), inner margin with three robust setae, outer margin with one robust seta on distal angle; inner ramus glabrous and subequal outer ramus; outer ramus with one medial robust seta. Uropod 3 slightly longer than uropod 2 and 0.6 times the uropod 1 length, peduncle wider than long (1.2 times), shorter than outer ramus (0.6 times), distal inner angle with one robust seta, distal outer angle with two robust setae; rami foliaceous; inner ramus shorter than article 1 of outer ramus, inner margin with four long setae and two distal pappose setae; outer ramus 2-articulate, article 1 3.3 times longer than article 2, inner margin with three slender setae, outer margin with three robust setae and one long seta; article 2 with two distal pappose setae. Telson deeply cleft (up to 70% length), lateral margins each with two short setae; distal margin of each lobe weakly incised distally with one robust seta.

Journal of Natural History 543
Variation Paratypes showed variation in the number of setae on the ventral margin of both epimeral plates 1 and 2, and in the number of long setae in the facial row on the basis of pereopod 6, which varied from 9 to 12.

Remarks
Apart from the generic differences, Carangolioides hamatus gen. et sp. nov. shows some similarities with Urothoe falcata. At a glance, both species can be differentiated by epimeral plate 3, which has the posteroventral angle strongly produced into an upturned acute spine in the new species. However, C. hamatus sp. nov. differs from the latter in having the palm of gnathopod 2 longer than the posterior margin of the propodus; the posterior margin of pereopod 7 smooth versus dentate; basis of pereopod 6 not widened distally; coxa 7 lacking a posteroventral lobe; and the inner ramus of uropod 3 shorter than article 1 of the outer ramus, versus subequal.

Geographic distribution
Known only from the type locality, Campos Basin, off Rio de Janeiro State coast.

Bathymetric range
Collected at 750 m depth.

Etymology
From Latin corona (crown), referring to the crown of short, stout setae present on mandible molar combined with the pre-existing genus Urothoe. Gender feminine.

Remarks
Coronaurothoe gen. nov. differs from other urothoid genera by its mandibular molar surrounded by a crown of robust setae, article 1 of the maxillary palp shorter than article 2, article 2 of maxillipedal palp having the distal corner of the inner margin produced and the telson cleft to about 50% length.

Etymology
From Latin rotundus (rounded), referring to the rounded projection present at the anteroventral corner of the head.

Diagnosis
As for genus.

Description
Head without eyes; rostrum absent; anteroventral corner produced into rounded process. Antenna 1 peduncular article 1 with two slender setae on anterior margin; primary flagellum 4-articulate and 2.6 times as long as peduncular article 3; accessory flagellum absent. Antenna 2 reaching end of peduncular article 2 of antenna 1; peduncular article 4 as long as article 5, anterior margin with five slender setae, facial margin with two long setae; peduncular article 5 anterior margin with five slender setae. Upper lip rounded distally. Mandible molar present, large and triturative; right mandible lacinia mobilis 5-dentate; left mandible lacinia mobilis 4-dentate, accessory setal row absent; incisor process well developed, large and smooth; palp article 2 longer than article 3, with one marginal seta; article 3 with four distal setae. Maxilla 1 inner plate with one distal pappose seta and three short setae; outer plate with nine robust setae; palp article 1 shorter than article 2 (0.12 times); article 2 with six distal pappose setae. Maxilla 2 outer plate wider than inner plate, both with long setae on distal margin. Maxilliped inner plate with three apical robust setae, outer plate about one-half length of palp article 2, with seven marginal robust setae; palp article 2 expanded, twice as long as wide, inner distal margin produced, inner margin densely setose; article 3 widened distally; article 4 0.3 times of article 3, with a slender distal setae. Gnathopod 1 coxa rectangular, twice as long as wide, anteroventral corner subquadrate, posteroventral angle with a notch bearing a seta; basis long and slender, widened distally, posterior margin with four long setae; carpus slightly shorter than propodus, posterior margin slightly lobate and poorly setose; propodus with a tuft of setae on anterodistal angle; palm extremely acute, excavated and longer than posterior margin, with two long and robust setae near palmar corner; dactylus stout, as long as propodus. Gnathopod 2 coxa rectangular, 2.9 times longer than wide, posteroventral angle with a notch; basis long and slender, widened distally, posterior margin with one long seta; carpus 1.2 times longer than propodus, posterior margin not lobate and poorly setose; propodus facial margin setose; palm acute, shorter than outer margin, with one robust seta on palmar corner; dactylus stout, as long as palm. Pereopod 3 coxa twice as long as wide, with one seta on posteroventral angle; basis 2.5 times longer than wide, with one seta on posterodistal angle; merus with two setae on posterior margin, shorter than carpus and propodus combined; carpus moderately robust, 1.5 times longer than wide, with six long robust setae on posterior margin; propodus more slender than carpus, with four robust setae on posterior margin; dactylus short, 0.8 times propodus length. Pereopod 4 coxa almost as long as wide, posterior margin excavate with posteroventral angle produced into rounded process; basis 3.3 times longer than wide, with one short seta on posterodistal angle; merus with two long setae on posterior margin, longer than carpus and propodus combined; carpus moderately robust, 1.7 times longer than wide, with seven long robust setae on posterior margin; propodus more slender than carpus, with three robust setae on posterior margin; dactylus short, 0.75 times propodus length. Pereopod 5 coxa slightly wider than long, with posteroventral lobe produced; basis ovate, 1.3 times longer than wide, posterior margin slightly sinuous, distally notched, with two short setae; merus as long as wide, anterodistal angle with a robust seta; posterodistal angle with a robust seta; carpus 2.3 times longer than wide, anterior margin with two combs of robust setae (2-2), posterior margin with two combs of setae (2-2); propodus shorter than carpus, 2.75 times longer than wide, anterior margin with two combs of setae (2-2), posterodistal angle with two slender setae; dactylus styliform, 1.6 times longer than propodus. Pereopod 6 coxa 1.7 times wider than long, with produced posteroventral lobe; basis ovate, 1.8 times longer than wide, posterior margin smooth, lacking setae; merus 1.9 times longer than wide, anterior margin with two combs of setae (1-2), posterior margin with two setae on posterodistal angle; carpus 2.9 times longer than wide, anterior margin with two combs of slender setae (3-3), posterodistal angle with three slender setae; propodus about 0.7 times carpus length, 3.6 times longer than wide, anterior margin with two setae midway, distal margin with five slender setae; dactylus long, 1.4 times longer than propodus. Pereopod 7 coxa 1.2 times wider than long, with posteroventral lobe not produced; basis ovate, 1.4 times longer than wide, posterior margin smooth lacking setae; merus 1.3 times longer than wide, anterodistal angle with two seta, posterodistal angle with one long seta; carpus 2.5 times longer than wide, anterior margin with two combs of slender setae (3-5), posterior margin with a slender seta midway, posterodistal angle with three slender setae; propodus shorter than carpus, 3.8 times longer than wide, anterior margin with one middle comb of six slender setae, distal margin with six slender setae; dactylus short, 0.5 times of propodus length.
Epimeral plates 1-3 each with ventral margin lacking setae and with posteroventral angle acute. Uropod 1 peduncle 0.7 times shorter than rami, with one robust seta on both inner and outer distal angle; rami subequal in length and naked. Uropod 2 peduncle shorter than rami (0.85 times), with one facial robust seta, inner margin with four robust setae, outer margin with one robust seta; rami subequal in length and naked. Uropod 3 about 0.7 times the uropod 2 length and 0.5 times the uropod 1 length, peduncle 1.2 times longer than wide, 0.47 times shorter than outer ramus, distal outer angle with two robust setae; rami lanceolate; inner ramus subequal to article 1 of outer ramus, with one long seta on inner margin, with one apical long pappose seta; outer ramus 2-articulate, article 1 1.3 times longer than article 2, outer margin distal angle with one robust seta; article 2 with one apical long and pappose seta and one short seta. Telson cleft (about 40%), lateral margins with two short setae; distal margin of each lobe weakly incised distally with one robust seta.

Variation
Paratypes showed variation in number of pappose setae on the ventral margin of both epimeral plates 1 and 2, and the flagellum of antenna 1, that varied from 4-to 5articulate.