Acanthephyra curtirostris Wood-Mason & Alcock, 1891

(Figs. 3 A–B, 4, 39 B)

Acanthephyra acutifrons Spence Bate, 1888, p. 749 . (Part)— Kemp, 1906: 22.

Acanthephyra curtirostris Wood Mason & Alcock, 1891, 195.—Wood Mason & Alcock 1892: 364, pl. 3, fig. 5.— Faxon 1895: 164, pl. 43, figs. 2–5.— Anderson, 1896: 94.— Alcock 1899: 76; 1901: 81.— Kemp 1906: 22.— de Man 1920: 44.— Balss 1925: 261, fig. 30.— Chace 1936: 26; 1937: 111; 1940: 143, fig. 21; 1947: 17.— Calman 1939: 194.— Springer & Bullis 1956: 11.— Figueira 1957: 28, pl. 2, fig. 1.— Pearcy & Forss 1966: 1137.— Crosnier & Forest 1968: 1129; 1973: 39, fig. 8a.—Kensley 1981a: 57; 1981b: 21.— Kensley et al. 1987: 283.— Vereshchaka 1990: 139.— Pequegnat & Wicksten 2006: 96.

Material examined: 2 M and 1 F, Rocas Atoll, Abracos 1 ST# 22/ Leg.1, Midwater Tow, 830 m, 04° 07’ S / 033/ 47’ W; 04° 07’ S / 033° 48’ W, 0 8 October 2015, MOUFPE: 15.659. 2 M and 4 OF, Rio Grande do Norte, Abracos 2 ST# 35/ Leg. 1, 04° 19,60’ S / 035° 29,8’ W; 04° 18,54’ S / 035° 32,40 W, 20 April 217, MOUFPE : 18463. 3 M and 5 F, Fernando de Noronha, Abracos 2 ST# 39/ Leg. 2, Midwater Tow, 800 m, 04° 52,43’ S / 034° 3,51’ W; 04° 50,86’ S / 034° 5, 11’ W, 24 April 2017, MOUFPE : 18.407. 3 M, 2 F and 2 OF, Fernando de Noronha, Abracos 2 ST#42/ Leg. 2, Midwater Tow, 780 m, 03° 15,72’ S / 031° 49’ W; 03° 15,46’ S / 031° 50,68’ W, 27 April 2017, MOUFPE : 18.471. 6 M, 5 F and 1 OF, Fernando de Noronha, Abracos 2 ST#44A/ Leg. 2, Midwater Tow, 850 m, 03° 52,87’ S / 032° 17,54’ W; 03° 52,21’ S / 032° 16,45’ W, 28 April 2017, MOUFPE : 18462. 2 F, Fernando de Noronha, Abracos 2 ST#46/ Leg. 2, Midwater Tow, 360 m, 04° 08’ S / 032° 18’ W; 04° 8,59’ S / 032° 17,46’ W, 29 April 2017, MOUFPE : 18.420. 1 F, Rocas Atoll, Abracos 1 ST# 51/ Leg. 2, Midwater Tow, 800 m, 08° 56’ S / 034° 29’ W; 08° 59’ S / 034° 28’W, 19 October 2015, MOUFPE : 15.660. 5 M, 4 F and 3 OF, Rocas Atoll, Abracos 2 ST#53A/ Leg. 2, Midwater Tow, 65 m, 03° 49, 75’ S/ 0 33 87,70’ W; 03° 48,44’ S / 033° 57,75’ W, 0 2 May 2017, MOUFPE : 18.435.

Diagnosis: Integument firm. Rostrum not reaching beyond antennular peduncle, 10–14 dorsal teeth and with a single tooth on lower margin. Carapace not dorsally carinate posteriorly. Branchiostegal spine supported by a carina that extends back to posterior part of branchial region. Abdomen carinate on all but the first somite and with a median posterior spine on the third, fourth, fifth and sixth somites; telson dorsally sulcate on proximal half and armed with 6–15 dorsolateral spines (modified from Chace 1940).

Distribution: Western Atlantic: United States (Oregon), Bermudas, Bahamas, Gulf of Mexico, Caribbean Sea, Antilhas, Panama Basin, British Guiana and Brazil (Pará, Rocas Atoll, Fernando de Noronha and off Pernambuco). East Atlantic: Portugal (Madeira Island). Indo-Pacific Oceans: East coast of Africa, Aldabra Atoll, Arabian Sea, Maldives Islands, Gulf of Bengale, Andaman sea, United States (Northward California, coast of Baja) and Peru (Springer & Bullis 1956; Crosnier & Forest 1973; Chace 1986) (Fig. 4).

Bathymetric distribution: 550–5900 m depth (Springer & Bullis 1956; Crosnier & Forest 1973; Burghart et al. 2007; 2017), herein this species was found in Rocas Atoll at depths between 65–850 m, thus extending its bathymetric distribution from shallow waters.