Nudisodalis acicula Dojiri & Cressey 1987

Nudisodalis acicula Dojiri & Cressey, 1987

(Figs 4–5)

Nudisodalis acicula Dojiri & Cressey 1987: 190.

Material examined. 16 Ƥ (NSMT-Cr 21653), ex 1 Pervagor aspricaudus (Hollard) (URMP 33884), East China Sea, Manza, Okinawa-jima Island, Okinawa Prefecture, Japan, 1 July 1995; 5 Ƥ (WAM C38582, C38749), ex 1 P. aspricaudus (WAM P.29641.011), Juliette Cay, Coral Sea, 14 November 1987; 5 Ƥ, 2 3 and 46 copepodids (AM P65283), ex 1 P. aspricaudus (AM I20779-197), Cape York, Queensland, Australia, 22 February 1979; 1 Ƥ (WAM C38691), ex Pervagor janthinosoma (Bleeker) (WAM P.25542.002), Northwest Cape, Western Australia, Australia, 20 May 1976; 1 Ƥ (WAM C38588), ex P. janthinosoma (WAM P.30652.065), Norwegian Bay, Western Australia, Australia, 19 June 1993; 2 Ƥ (WAM C38618), ex 1 P. janthinosoma (WAM P.27970.038), Point Quobba, Western Australia, Australia, 26 April 1983; 3 Ƥ (WAM C38608, C38736), ex 1 P. janthinosoma (WAM P.25813.009), S. Muiron Island, Western Australia, Australia, 5 June 1977; 9 Ƥ, 5 3 and 3 copepodids (WAM C38653, C38657–C38658, C38737–C38738), ex 3 P. janthinosoma (WAM P.31290.009), S. Muiron Island, Western Australia, Australia, 18 May 1996; 1 Ƥ (AM P65285), ex P. janthinosoma (AM I33703-047), Reef 11-102, Queensland, Australia, 14 January 1993; 1 Ƥ (AM P65286), ex P. janthinosoma (AM I37320-017), Vanuatu, 31 May 1996; 2 Ƥ (1 damaged) (AM P65284), ex 1 P. janthinosoma (AM I20983-038), Lizard Island, Queensland, Australia, 28 November 1978; 20 Ƥ, 3 3 and 1 copepodid (CAS 175477), ex 1 P. janthinosoma (CAS 57272), Palau Island, 11 September 1957; 5 Ƥ (CAS 175277), ex P. janthinosoma (CAS 57280), Nha Trang Bay, Vietnam, 31 January 1961; 4 Ƥ (CAS 175260), ex P. janthinosoma (CAS 57268), Ngakarak Reef, Palau Island, 12 July 1956; 1 Ƥ and 2 3 (CAS 175259), ex 1 P. janthinosoma (CAS 57276), W. Caroline Island, 14 April 1959; 6 Ƥ (CAS 175485), ex 1 P. janthinosoma (CAS 57271), Aitaburai Pt., Palau Island, 30 October 1956; 6 Ƥ (1 damaged) (CAS 175514), ex 1 P. janthinosoma (CAS 57273), Ngakarak Reef, Palau Island, 12 September 1957; 2 Ƥ (MAGNT Cr014960), ex 1 P. janthinosoma (MAGNT S.13589-041), Pandora Wreck, Queensland, Australia, 14 January 1993; 4 Ƥ and 2 3 (NSMT-Cr 21647), ex 1 Pervagor melanocephalus (Bleeker), East China Sea, Manza, Okinawa-jima Island, Okinawa Prefecture, Japan, 1 July 2007; 3 Ƥ and 2 3 (NSMT-Cr 21652), ex 1 P. melanocephalus, East China Sea, Seragaki, Okinawa-jima Island, Okinawa Prefecture, Japan, 4 July 2007; 14 Ƥ and 2 3 (AM P69679), ex 1 P. melanocephalus (AM I33744-020), Boot Reef, Coral Sea, 26 January 1993; 3 Ƥ, 4 3 and 10 copepodids (1 damaged) (AM P65292), ex 1 P. melanocephalus (AM I39040-012), Solomon Island, 29 September 1998; 3 Ƥ, 1 3 and 1 copepodid (AM P65289), ex 1 P. melanocephalus (AM I 21915-017), Sombrero Island, Philippines, 24 April 1980; 3 Ƥ (AM P65287–P65288), ex 2 P. melanocephalus (AM I18354-090), Bird Island, Fiji, 9 July 1974; 3 Ƥ and 1 damaged 3 (AM P65290), ex 1 P. melanocephalus (AM I21422-040), Lizard Island area, Queensland, Australia, 27 January 1975; 12 Ƥ, 3 3 and 21 copepodids (LACM CR1981-092.2), ex 1 P. melanocephalus (LAC 42491-19), Mindoro Island, Philippines, 13 July 1981; 9 Ƥ (LACM CR1950-002.1 and 1950- 002.3), ex 2 Pervagor spilosoma (Lay & Bennett) (LAC 1270), Oahu, Hawaii, 18 July 1950; 2 Ƥ paratypes (USNM 228425), ex P. spilosoma, Oahu, Hawaii.

Supplemental description of adult female. Body 0.74 mm long (excluding caudal setae) and 0.38 mm wide (n = 7) (Fig. 4 A). Several specimens with considerably wider cephalothorax and second pedigerous somite (Fig. 4 B). Caudal ramus (Fig. 4 C) armed with 7 setae (seta I minute) and posterodorsal flap. Terminal spinulate process of maxilla (Fig. 4 D) bearing 2 minute, unequal elements.

Description of adult male. Body 0.50 mm long (excluding caudal setae) and 217 µm wide (n = 2) (Fig. 4 E). Second pedigerous somite 153 µm wide; remaining pedigerous somites decreasing in width posteriorly. Genital double-somite nearly equal in length (78 µm) and width (77 µm). Abdomen 75 µm long and 47 µm wide, composed of 3 free somites; ventral surface of anal somite (Fig. 4 F) with fewer rows of spinules (3 vs. 5) than in female. Caudal ramus longer (23 µm) than wide (15 µm), bearing similar elements as in female.

Postantennal process (Fig. 5 A) slimmer and more elongate than that in female. Maxilliped (Fig. 5 B–C) 4-segmented; syncoxa bearing naked inner seta; basis elongate, armed with 2 naked setae and 2 longitudinal rows of denticles; first endopodal segment small, unarmed; second segment elongate, curved, bearing long seta on posterior surface, 2 setae on anterior surface and 2 rows of large denticles along concave margin. Exopodal spines of leg 2 (Fig. 5 D) bearing large teeth along outer margin; outer distal spine on third segment strongly curved, about as long as apical spine. Outer proximal spine on third endopodal segment of leg 2 (Fig. 5 E) slightly curved; outer distal spine appearing slightly bent due to fringe of spinules near midlength. Leg 3 exopod (Fig. 5 F) similar to that of leg 2, except outer distal spine straight, about two-thirds length of apical spine. Middle spine on third endopodal segment of leg 3 (Fig. 5 G) robust, strongly curved.

Attachment site. Branchial cavity wall.

Remarks. Nudisodalis acicula was established by Dojiri & Cressey (1987) for specimens found on Pervagor spilosoma (Lay & Bennett) (as Pervagor spilosomus) collected from Oahu, the Hawaiian Islands. Comparisons between our material and two N. acicula paratype females (one left intact, the other with cephalothoracic appendages removed) revealed that Dojiri & Cressey (1987) had overlooked seta I and the posterodorsal flap on the caudal rami and an additional element on the terminal process of the maxilla. Nudisodalis acicula can be distinguished from all other taeniacanthid species by the combination of the lanceolate terminal process of the maxilla and the non-prehensile terminal segment of the maxilliped.