Stylopandalus richardi Coutiere 1905

Stylopandalus richardi (Coutiére, 1905)

(Figs. 7, 8)

Pandalus (Stylopandalus) Richardi Coutiére, 1905: 1115.

Stylopandalus Richardi – Richard, 1905: 11.

Parapandalus Richardi – De Man, 1920: 108, 138, 140.

Parapandalus richardi – Chace, 1940: 192, fig. 58–61; Crosnier & Forest, 1968: 1138; 1973: 224, fig. 69b; Pequenat, 1970: 86.

Plesionika nana Murray & Hjort, 1912: 585, 668.

Pandalus (Plesionica) gracilis Borradaile, 1915: 208.

Parapandalus Zur strasseni Balls, 1914: 597; De Man, 1920: 108, 138, 139, 141, pl.12, fig 32, 32d.

Parapandalus Zurstrasseni – Balls, 1925: 273; Calman, 1939: 201.

Stylopandalus richardi – Burukovsky, 1982: 45; Chace, 1985: 136, fig. 62; Kensley et al., 1987: 319.

Material examined: Oceanprof II: A13, 21o53’S, 39o51’W, 1077m, 1 male (7.2mm), MNRJ 19995.

Description: Rostrum long, slightly curved upwards beyond antennular peduncle; far overreaching scaphocerite, 2.8 times as long as carapace; ventral margin with 18 teeth, anterior closely disposed, distal well spaced; dorsal margin with 11 teeth, larger one proximal and smaller ones at irregular intervals until distal rostrum end, one small post-rostral teeth, not movable; eye small, spherical, without ocellus; strong antennal and pterygostomian spines present; carapace dorsal margin carinate anteriorly (Fig. 7 A). Stylocerite outer and inner margin convex, apex triangular, not reaching the distal margin of first antennular peduncle article (Fig. 7 B). Scaphocerite 0.87 as long as carapace, with rounded apex, distal tooth strongly overreaching blade (Fig. 7 C). Maxilliped III with epipod, penultimate segment as long as terminal segment. Pereopods 1–5 without epipod. Pereopod 2 chelate, equal in size (Fig. 7 D, E), carpus with 11 articles. Dorsal surface of abdominal somite 3 rounded and pronounced; pleura of somites 4 and 5 triangular but not acute (Fig. 8 D), abdominal somite 6 3.3 times as long as high. Telson as long as abdominal somite 6; sulcate on dorsal midline, with four pairs of dorsolateral stout setae, and two pairs of stout distal setae (Fig. 8 E).

Distribution: Western Atlantic: New Foundland (Canada), Mexico (Gulf of Mexico), Bermudas, Cadix, Brazil (Rio de Janeiro). Eastern Atlantic: Azores Island, Canary Islands, Madeira Islands, Gibraltar, Gulf of Guinea, Adriatic Sea, Red Sea, Gabon, Congo, Angola. Mediterranean. Indian and Pacific: Natal, Philippines, Seychelles, Sumatra, Indonesia, Malay Archipelago, Gulf of Bengal, Banda Sea, Australia, Hawaii, Alaska. Absent from South and East China seas and from the large islands of Japan. Adults are pelagic, living in depths from 7 meters to 3600 m (modified from Calman, 1939; Chace 1940, 1985; Pequegnat, 1970; Crosnier & Forest, 1973).

Remarks: The specimen examined herein presents a number of rostral ventral teeth (18) fitting in the range cited by Chace (1985) to Philippines material (16–27). The number of dorsal teeth (11) however is lower than the range cited by Chace (1985) (15–21) and by Pequegnat to Gulf of Mexico material (16–18). Instead the rostrum of the specimen examined is brooked in its extreme distal end, it is possible to conclude that only a small portion was lost, and the proportion of its length in relation with carapace is 2.8, agreeing with that cited by Pequegnat (1970), Chace (1940; 1985) and Kensley et al. (1987). The number of articles on carpus of pereopod 2 is 11, also in the range (7–13) pointed by Chace (1985) and Kensley et al. (1987), and the relative size of abdominal somite 6 (3.3) agrees with that cited in literature: at least three times as long as high (Pequegnat, 1970; Chace, 1949; 1985; Kensley et al., 1987). The long posteromesial stout seta on abdominal somite 3 and the distal end of the dactyl of pereopods were lost in the examined specimen.