Plesiopenaeus coruscans (Wood-Mason, 1891)

(Figs. 23–25)

Aristeus coruscans Wood-Mason in Wood-Mason & Alcock, 1891:280, fig. 6. Aristaeus (Plesiopenaeus) coruscans - Alcock, 1901: 37 –38.

Plesiopenaeus coruscans - Burkenroad, 1936: 95 –100; Crosnier, 1978: 86 –96, figs. 31 f–g, 32 c–f; Pérez Farfante & Kensley, 1997: 52; Dall, 2001: 422.

Type locality: Bay of Bengal.

Material examined: St. E0496, 13º17.580' S – 38º17.599' W to 13º12.030' S – 38º14.873' W, 1717 m, 07/ VI/2000, 1 female, cl: 65.4 mm, MNRJ 14524. St. E0519, 13º19.944' S – 38º19.654' W to 13º22.615' S – 38º21.960' W, 1730 m, 20/VI/2000, 2 females, cl: 22.7–26.8 mm, 1 male, cl: 54. 9 mm, MNRJ 14577. St. E0525, 20º08.145' S – 38º38.081' W to 20º07.308' S – 38º42.906' W, 1639 m, 28/VI/2000, 4 females, cl: 59.0– 74.6 mm, MNRJ 14525. St. E0526, 20º06.565' S – 38º40.502' W to 20º03.984' S – 38º36.676' W, 1637 m, 28/VI/ 2000, 3 females, cl: 54.9–75.6 mm, 3 males, cl: 62.2–69.3 mm, MNRJ 14515. St. E0527, 19º50.736' S – 39º10.817' W to 19º50.563' S – 39º14.496' W, 1402 m, 29/VI/2000, 2 females, cl: 77.7–90.5 mm, 2 males, cl: 64.8–65.2 mm, MNRJ 14521. St. E0528, 19º45.258’ S – 39º03.003’ W to 19º47.581’ S – 38º59.827’ W, 1237 m, 29/VI/2000, 1 female, cl: 99.0 mm. MNRJ 14514. St. E0536, 20º24.008' S – 39º46.217' W to 20º27.001' S – 39º44.843' W, 1293 m, 02/VII/2000, 1 female, cl: 88.1 mm, 1 male, cc: 70.6 mm, MNRJ 14513. St. E0538, 20º27.667' S – 39º38.101' W to 20º32.771' S – 39º37.650' W, 1680 m, 02/VII/2000, 1 female, cl: 78.3 mm, MNRJ 14516. St. E0540, 21º12.293' S – 38º39.838' W to 19º42.684' S – 38º44.568' W, 925 m, 27/VI/2000, 1 female, cl: 89.3 mm, MNRJ 14520. St. E0544, 21º24.306' S – 40º02.847' W to 21º20.953' S – 40º02.847' W, 1159 m, 05/VII/2000, 2 females, cl: 77.1–86.1 mm, 2 males, cl: 60.6–60.8 mm, MNRJ 14519. St. E0549, 21º25.738' S – 39º43.946' W to 21º22.965' S – 39º44.646' W, 1718 m, 07/VII/2000, 1 male, cl: 62.2 mm, MNRJ 14522. St. E0550, 21º26.324’ S – 39º49.113’ W to 21º28.583’ S – 39º47.176’ W, 1598 m, 07/VII/2000, 1 female, cl: 72.2 mm, MNRJ 14523. St. E0551, 21º.07.780' S– 39º49.106' W to 21º04.783' S – 39º48.698' W, 1642 m, 08/VII/2000, 1 female, cl: 83.8 mm, 1 male, cl: 71.3 mm, MNRJ 14526. St. E0552, 21º07.493' S – 39º46.423' W to 21º09.541' S – 39º46.079' W, 1694 m, 08/VII/2000, 1 female, cl: 81.8 mm, MNRJ 14518.

Diagnosis: Rostrum curved sligthly upward, with 3 dorsal spines; gastro-orbital carina reaching cervical carina and orbital margin. Females with an oval plate on sternite XII. Males with ventral spines on sternites IX–XI, sternite XII with an oval plate, and sternite XIII with a tubercle. Abdominal somites 4–6 with a dorsal carina and ending in spines. Petasma with distal extremity slightly rounded; ventral costa smaller than median lobe, sligthly curved inward, not forming a hook. Appendix interna oval, with a small carina. Appendix masculina triangular, smaller and thinner than appendix interna.

Description: Rostrum curved sligthly upward, with 3 dorsal spines, with some simple setae on ventral region of rostrum and in front of rostrum spines (Fig. 23 a). Adrostral carina well defined; branchiocardiac carina extends for almost total length of carapace; antennal, branchiostegal, cervical and submarginal carina and post-cervical sulcus present; gastro-orbital carina reaching cervical carina and orbital margin; antennal and branchiostegal spines present (Fig. 23 a).

Abdominal somites 1–3 with a depression that extends from dorsum to middle of pleurae; pleurae with marginal setae; abdominal somites 4–6 with a dorsal carina and ending in spines (Fig. 23 a).

Antenna l scaphocerite approximately 1.5 X of antennular peduncle (Fig. 23 a–c).

Right and left mandibles with incisor and molar processes distinct; palp present (Fig. 23 d, 23e).

Maxillae, maxillipeds as for the family (Figs. 23 f–g, 24a–c).

First pereopod dactyl approximately 1.6 X of palm; carpus approximately 2 X of dactyl; merus approximately 0.7 X of carpus, with or without a disto-lateral cuspidate setae (Fig. 24 d).

Second pereopod dactyl approximately 1.4 X of palm; carpus approximately 3.5 X of dactyl; merus approximately 0.5 X of carpus, without a disto-lateral cuspidate setae (Fig. 24 e).

Third pereopod dactyl approximately 1.2 X of palm; carpus approximately 4.4 X of dactyl; merus approximately 0.5 X of carpus (Fig. 24 f).

Fourth pereopod dactyl approximately 1.5 X of propodus; propodus approximately 0.6 X of carpus; carpus approximately of the same size of merus (Fig. 24 g).

Fifth pereopod dactyl approximately 0.6 X of propodus; propodus approximately 0.4 X of carpus; merus approximately 1.4 X of carpus; males with an inner spine on coxa (Fig. 24 h).

Females with an oval plate on sternite XII (Fig. 25 a). Males with ventral spines on sternites IX–XI, sterniteXII with an oval plate, and sternite XIII with a tubercle (Fig. 25 b).

Petasma with distal extremity slightly rounded; ventral costa smaller than median lobe, sligthly curved inward, not forming a hook (Fig. 25 c–d). Appendix masculina oval, with a small carina (Fig. 25 e–f). Appendix interna triangular, smaller and thinner than appendix masculina (Fig. 25 f).

Distribution: Indian Ocean: Northeast of Australia. Eastern Atlantic Ocean: Madagascar; Arabian Sea; Bay of Bengal; Andaman Islands. Western Atlantic Ocean: Gulf of Mexico; Bahamas (Pérez Farfante & Kensley, 1997; Dall, 2001).

Depth: 900–2367 m. (Pérez Farfante & Kensley, 1997, Dall, 2001)

New records: Brazil, from Bahia to Espírito Santo states, between 925 and 1730 m.