Lamprops northwindae Gerken 2018, n. sp.

Lamprops northwindae n. sp.

(Figs 29–32)

Type material. Holotype: subadult female, LACM CR 10839, 74°N, 134°E, 10–20 m, Laptev Sea, collected by USCGC Northwind, August–September 1963, station 158. Paratypes: subadult female, dissected, LACM CR 10840, collected with holotype; adult male, dissected, LACM CR 10841, collected with holotype.

Other material. Adult male, 73°12’N, 134°E, 10–20 m, Laptev Sea, collected by USCGC Northwind, August–September 1963, station 111.

Diagnosis. Carapace without lateral ridges, antennal notch absent, pseudorostrum pointed, eyelobe large. Telson 1.1 length of uropod peduncles, 2–3 pairs lateral setae, 5 terminal setae. Uropod peduncle with 5 medial setae. Adult male smaller than female, antenna extending to end of carapace, pseudorostrum blunt; telson 1.2 length of uropod peduncles, with 1–2 pairs lateral setae, terminal setae long

Description. Holotype subadult female, LACM CR 10839.

Holotype subadult female, 2.3 mm. Carapace smooth, antennal notch oblique; pseudorostral lobes 0.5 carapace length; eyelobe 0.1 carapace length, no lenses; carapace longer than pereonites together (Fig. 29A, B).

Paratype subadult female, LACM CR 10840.

Paratype subadult female, 2.3 mm. Antennule peduncle article 1 longer than article 2, with 1 simple and 1 pappose seate; article 2 unarmed; article 3 equal to article 2, unarmed; main flagellum of 2 articles, as long as peduncle article 3, with 4 simple and 2 aesthetasc setae; accessory flagellum equal to first article of main flagellum, of 3 articles, with simple setae terminally (Fig. 29C).

Antenna of 4 articles, article 3 and 4 subequal, with 1 or 2 pappose setae per article (Fig. 29D).

Mandible broken, navicular, with 8 microserrate setae medially, lacinia mobilis with 3 cusps (Fig. 29E)

Maxillule with 2 endites; outer endite with double row of simple setae; inner endite with 4 simple and 1 pappose setae; palp with 2 microserrate setae (Fig. 29F).

Maxilla with 3 endites; broad endite distal margin with simple setae, medial margin with 11 simple setae; medial narrow endite with 4 simple setae terminally; distal narrow endite with 5 simple setae terminally; both narrow endites extend past distal margin of broad endite (Fig. 29G).

Maxilliped 1 basis produced distally as blunt lobe, distal margin with simple and pappose setae; ischium absent; merus unarmed; carpus medial face lined with simple and comb setae, distal corner with 1 pappose seta; propodus medial face with simple setae, 1 pappose seta distally; dactylus with 3 simple setae terminally (Fig. 29H).

Maxilliped 2 basis longer than all other articles together, with 4 plumose setae distally; ischium unarmed; merus 0.2 basis length, with 1 plumose seta distally; carpus 1.5 merus length, 3 simple setae medially, 1 plumose seta distally; propodus 0.8 carpus length, 5 simple setae medially, 1 plumose and 1 pappose setae distally; dactylus 0.5 propodus length, 3 simple setae terminally (Fig. 29I).

Maxilliped 3 basis longer than all other articles together, expanded distally, medial margin with 6 pappose setae, distal corner with 3 plumose setae; ischium unarmed; merus 0.2 basis length, 1 medial and 1 distal pappose setae; carpus equal to merus, 2 medial pappose and 1 distal simple setae; propodus equal to carpus, with 1 simple seta; dactylus 0.5 propodus length, 3 simple setae terminally; exopod as long as basis, basal article unarmed, flagellum with plumo-annulate setae (Fig. 30A).

Pereopod 1 basis longer than next 4 articles together, with 9 medial and 4 lateral pappose setae; ischium 0.25 merus length, unarmed; merus equal to carpus length, with 2 pappose setae; carpus 0.75 propodus length, with 2 pappose setae; propodus with 1 simple seta; dactylus 0.75 propodus length, with 1 simple seta and 4 simple setae terminally; exopod as long as basis, basal article with 1 pappose seta, flagellum with plumo-annulate setae (Fig. 30B).

Pereopod 2 basis longer than next 4 articles together, with 8 pappose and 1 plumose setae medially, 1 pappose seta distally; ischium unarmed; merus 0.2 basis length, with 2 stout microserrate setae medially; carpus twice length of merus, with 6 microserrate setae medially; propodus 0.5 carpus length with 1 stout microserrate seta medially; dactylus 1.4 propodus length, with 1 simple seta and 3 simple setae terminally; exopod longer than basis, ischium and merus together, basal article with 3 pappose setae, flagellum with plumo-annulate setae (Fig. 30C).

Pereopod 3 basis longer than all other articles together, 7 pappose and 1 plumose setae; ischium 0.1 basis length, with 4 annulate setae; merus 1.5 ischium length, unarmed; carpus equal to merus, with 3 annulate setae; propodus 0.7 carpus, with 1 annulate seta; dactylus 0.6 propodus length, with 2 simple setae terminally; exopod rudimentary, of 2 articles, 0.3 basis length (Fig. 4D).

Pereopod 4 not illustrated.

Pereopod 5 basis as long as next 4 articles together, unarmed; ischium 0.1 basis length, with 4 annulate setae; merus 2.3 ischium length, with 4 annulate setae; carpus 1.3 merus length, with 1 simple and 3 annulate setae; propodus 0.5 carpus length, with 1 annulate seta; dactylus 0.75 propodus length, with 2 simple setae terminally (Fig. 30E).

Telson 2.4 length of pleonite 6, with 3 lateral setae with single subterminal setule, 5 terminal simple setae (Fig. 30F)

Uropod peduncles 2.1 pleonite 6 length, 0.9 telson length, with 5 medial simple setae with single subterminal setule. Uropod endopod of 3 articles, 1.3 peduncle length; article 1 longer than articles 2 and 3 together, with 5 medial and 1 lateral setae with single subterminal setule; article 2 0.4 article 1 length, with 2 medial simple setae with single subterminal setule; article 3 equal to article 2, with 2 medial and 1 lateral setae with single subterminal setule, terminal seta simple, longer than article 3. Uropod exopod 0.8 length of endopod; article 1 with 1 seta with single subterminal setule; article 2 1.2 length of article 1, with 4 medial simple setae, 2 lateral simple setae and 2 lateral setae with single subterminal setule, terminal seta longer than article 2, simple (Fig. 30F).

Paratype adult male, LACM CR 10841.

Adult male, 1.8 mm. Carapace smooth, no trace of antennal notch; pseudorostral lobes 0.25 carapace length; eyelobe 0.1 carapace length; carapace longer than pereonites together (Fig. 31A, B).

Antennule including setae as long as antenna; peduncle article 1 equal to article 2,with 3 simple setae, surface scaled; article 2 with few simple setae; article 3 0.7 article 2 length, unarmed; main flagellum equal to article 1 length, of 3 articles, with 3 simple and 3 aethetasc setae; accessory flagellum as long as article 1 of main flagellum, of 3 articles, with simple setae (Fig. 31C).

Antenna peduncle of 3 articles, first article broken, with 2 plumose setae; next article short, unarmed; final article with few simple setae, not arranged in ranks; flagellum shorter than peduncle, first 10 articles with anterior tooth, as a section curved anteriorly, final 5 articles without tooth, as a section pointed posteriorly, this type of flagellum is interpreted as a clasping flagellum that wraps around the pereon of the female during mating (Fig. 31D).

Maxilliped 3 basis twice as long as all other articles together, with 2 medial pappose setae and 3 plumose setae at distal corner; ischium 0.05 basis length, unarmed; merus 2.7 length of ischium, with 1 medial pappose and 1 distal plumose setae; carpus equal to merus, with 4 medial pappose and 2 distal plumose setae; propodus equal to carpus, with 2 medial and 2 distal pappose setae; dactylus 0.75 propodus length, with 3 simple setae terminally; exopod equal to basis, basal article with 3 pappose setae, flagellum with plumo-annulate setae (Fig. 31E).

Pereopod 1 basis as long as all other articles together, with 4 pappose setae distally; ischium unarmed; merus 0.2 basis length, with 1 plumose and 2 pappose setae; carpus 0.6 merus length, with 2 pappose setae; propodus equal to carpus, with 3 simple setae; dactylus 0.8 propodus length, with 5 simple setae terminally; exopod as long as basis, basal article with 3 pappose setae, flagellum with plumo-annulate setae (Fig. 31F).

Pereopod 2 basis as long as next 3 articles together, with 9 pappose setae; ischium 0.1 basis length, unarmed; merus 1.75 ischium length, with 2 pappose setae; carpus 2.7 merus length, with 2 microserrate, 1 simple and 2 with subterminal setule setae; propodus 0.6 carpus length, with 2 setae with subterminal setule; dactylus 1.5 propodus length, with 5 simple setae terminally; exopod as long as basis, ischium and merus together, basal article with 3 pappose setae, flagellum with plumo-annnulate setae (Fig. 32A).

Pereopod 3 basis longer than all other articles together, with 2 pappose setae; ischium 0.1 basis length, with 1 annulate and 1 simple setae; merus 2.5 ischium length, with 3 annulate setae; carpus 0.9 merus length, with 1 simple and 2 annulate setae; propodus 0.6 carpus length, with 1 annulate seta; dactylus 0.6 propodus length, with 2 simple setae terminally; exopod longer than basis and ischium together, basal article unarmed, flagellum with plumo-annulate setae (Fig. 32B).

Pereopod 4 basis as long as next 4 articles together, with 1 pappose seta; ischium 0.2 basis length, with 2 annulate setae; merus twice ischium length, with 3 annulate setae; carpus equal to merus, with 3 annulate setae; propodus 0.5 carpus length with 1 annulate seta; dactylus 0.7 propodus length, with 3 simple setae terminally; exopod longer than basis, basal article with 1 pappose seta, flagellum with plumo-annulate setae (Fig. 32C).

Pereopod 5 basis as long as next 3 articles together, with 2 pappose setae; ischium 0.2 basis length, with 1 pappose and 2 annulate setae; merus 1.6 ischium length, with 1 simple and 3 annulate setae; carpus 0.2 merus length, with 3 annulate setae; propodus 0.5 carpus length, with 1 annulate seta; dactylus 0.7 propodus length, with 2 simple setae terminally (Fig. 32D).

Telson 2.9 length of pleonite 6, with 1 or 2 microserrate setae, 5 long terminal microserrate setae (Fig. 32F).

Uropod peduncles 2.3 length of pleonite 6, 0.8 length of telson, with 4–5 microserrate setae medially. Uropod endopod of 3 articles, equal to peduncle; article 1 longer than articles 2 and 3 together, medial margin serrate, with 4–5 microserrate setae medially, 1 simple seta distally; article 2 0.4 length of article 1, with 1 medial microserrate seta and 1 lateral simple seta; article 3 1.1 length of article 2, with 1 medial microserrate and 1 lateral simple setae, terminal seta as long as article 3, simple. Uropod exopod 0.8 length of endopod; article 1 0.6 length of article 2, with 1 lateral simple seta; article 2 with 3 lateral and 1 medial simple setae, terminal seta 0.8 article 2 length, with single subterminal setule (Fig. 32F).

Etymology. The species is named after the U.S. Coast Guard ship Northwind, the vessel from which the specimens were collected.

Depth. 10–20 m.

Distribution. Laptev Sea, 74°N, 119°E and 73°12’N, 134°E, estimated from cruise report station location (USCG 1965).

Remarks. The most similar species is Lamprops fuscatus. The new species can be distinguished by the combination of no antennal notch, blunt pseudorostrum and a large eyelobe. In comparison, L. fuscatus has a weak antennal notch, pointed pseudorostrum, and a small eyelobe. In addition, L. northwindae n. sp. is known from the North Pacific, while L. fuscatus was originally described from the North Atlantic. It is probable that the records of L. fuscatus from the boreal Pacific are actually L. northwindae or related species. Lamprops northwindae has the telson longer than the uropod peduncles in both sexes, which differentiates it from the similar species in Alamprops, A. affinis, A. carinatus, A. obfuscatus, in which the telson is shorter or subequal to the uropod peduncles in length. Lamprops northwindae has no antennal notch, and the anterolateral corner is entire, unlike A. serratus in which the antennal notch is present and the anterolateral corner is strongly serrate.