Pasiphaea major Hayashi, 2006

Rodrigues, Thaiana G. A. & Cardoso, Irene A., 2019, First record of four Pasiphaea Savigny, 1816 (Crustacea, Decapoda, Pasiphaeidae) species from the southwestern Atlantic, Zootaxa 4560 (2), pp. 321-330 : 323

Pasiphaea major Hayashi, 2006

( Figure 2 )

Pasiphaea major Hayashi, 2006a: 219 , figs. 9–11; De Grave & Fransen, 2011: 258.

Material Examined. REVIZEE, St. 0 506, 19°42.716’S, 38°36.497’W, 935m, 2 females (41.59mm; 47.84mm), MNRJ27921; St. 0 523, 19°42.569’S, 38°32.030’W, 922m, 1 female (37.21mm) and 1 male (55.20mm), MNRJ14620 ; St. 0 496, 13°17.580’S, 38°17.599’W, 1717m, 1 male (71.25mm), MNRJ14613 ; St. 0 524, 19°43.663’S, 38°39.838’W, 925m, 1 female (28.32mm), MNRJ27922 ; St. 0 552, 21°07.493’S, 39°46.423’W, 1694m, 2 males (59.61mm– 69.35mm), MNRJ14604 ; St. 0 551, 2107.780’S, 39°49.106’W, 1642m, 1 female (63.80mm), MNRJ14603 ; St. 0 548, 21°28.611’S, 39°40.303’W, depth 1799m, 1 male (67.30mm) and 1 female (80.36mm), MNRJ14609 ; St. 0 505, 14°36.606’S, 38°49.345’W, 1089m, 1 female (59.29mm), MNRJ14619 ; St. 0 519, 13°19.944’S, 38°19.654’W, 1730m, 1 male (61.52mm), MNRJ14618 ; St. 0 550, 21°26.324’S, 39°49.113’W, 1598m, 1 male (57.20mm), MNRJ14612 ; St. 0 526, 19°42.716’S, 38°36.497’W, 935m, 1 male (57.61mm), MNRJ27923 ; St. 0 544, 21°24.306’S, 40°02.916’W, 1159m, 1 male (50.96mm) and 1 female (69.79mm), MNRJ14610 ; St. 0 536, 20°24.008’S, 39°46.217’W, 1293m, 1 male (55.53mm) and 1 female (80.22mm), MNRJ14615 ; St. 0 504, 19°42.734’S, 38°36.472’W, 910m, 1 female (32.01mm) and 1 male (61.22mm), MNRJ13692 ; St. 0 502, 19°37’488’S, 38°41’909’W, 665–706m, 2 females (24.58mm– 28.05mm), MNRJ27925 ; St. 0 528, 19°45.258’S, 39°03.003’W, 1237m, 1 male (37.06mm), MNR 14606; St. 0 535, 19°58.936’S, 39°38.657’W, 1002m, 1 male (21.16mm) and 1 female (53.59mm), MNRJ14621 . HABITATS, St. 8, 21°07’21.775”S, 39°38’21.365”W, 1890m, not sexed (20.80mm), MNRJ27924 ; St. 13, 21°40’40.489’’S, 39°57’57.119’’W, 989.5m, 1 female (34.04mm), MNRJ27926 ; St. 62; 23°9’51.124”S, 40°50’21.622’’W, 1244.4m, 1 female (19.55mm), MNRJ27927 .

Diagnosis. Body robust. Rostrum with basal slit, apex not reaching or sometimes overreaching anterodorsal margin of carapace ( Fig. 2A, B ). Carapace sharply carinate, sometimes with shallow depression near each side of rostral base ( Fig. 2A, B ). Branchiostegal sinus large and deep; branchiostegal spine marginal or submarginal ( Fig. 2A ). First pereopod with 2–10 spines on merus, unarmed on ischium and basis, posterodistal angle of basis bluntly produced, not dentiform ( Fig. 2C ). Second pereopod with 10–20 spines on merus, 0–1 spine on ischium and 0–8 spines on basis and one acute posterodistal tooth ( Fig. 2D ). First abdominal somite with dorsal carina on distal half, second to fifth somites sharply carinate along entire length; sixth abdominal somite strongly compressed and slightly shorter than fifth, with dorsal margin sharply carinate in proximal 3/4 and distally flattened ( Fig. 2E, F ). Telson grooved in dorsal midline, posterior margin deeply forked with 8–11 pairs of spines ( Fig. 2G, H ); telson as long as sixth abdominal somite. Pleurobranch on the eighth thoracic somite (modified from Hayashi, 2006a).

Distribution. Type locality: Indo-Pacific Ocean, Norfolk Ridge (2316’S, 16749’E). Lord Howe Ridge, New Caledonia, Wallis & Futuna, Marquesas Islands, Tonga Island and Madagascar. New records: Atlantic Ocean, Brazil (Rio de Janeiro, Espírito Santo, Bahia). Depth: 226–1890m.

Remarks. The material herein examined agrees with the description of Hayashi (2006a) in almost all diagnostic characters, except: second pereopod with 0–8 spines on basis ( Fig. 2D ) vs. 0–4 observed by Hayashi (2006a) and telson with 8 pairs of spines in most of the specimens herein examined ( Fig. 2H ) vs. 11 pairs observed by Haysahi (2006a).

Pasiphaea major belongs to the P. alcocki species group and is closely related to Pasiphaea barnardi Yaldwyn, 1971 . Both species present the basis of the second pereopod with less than 8 spines. They present the following differences: telson as long as the sixth abdominal somite in P. major ( Fig. 2F, G ) vs. slightly shorter in P. barnardi ; first pereopod with 2–10 spines on merus ( Fig. 2C ) vs. 0–6 spines; and second pereopod with 10–20 spines on merus and 0–1 spine on ischium ( Fig. 2D ) vs. 7–21 spines on merus and 0–2 spine on ischium ( Hayashi, 2006a).

Figures

FIGURE 2. Pasiphaea major Hayashi, 2006, female (61.52mm), MNRJ 14618. A. Carapace, lateral view; B. Carapace, dorsal view; C. Right first pereopod, lateral view; D. Right second pereopod, lateral view; G. Telson, dorsal view; H. Posterior margin of telson, dorsal view. Pasiphaea major Hayashi, 2006, male (60.32mm), MNRJ14615. E. Sixth abdominal somite, lateral view; F. Sixth abdominal somite, dorsal view.