Pasiphaea major Hayashi 2006
Creators: name: Rodrigues, Thaiana G. A.
name: Cardoso, Irene A.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Pasiphaeidae
Pasiphaea
Pasiphaea major

description: 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).
description: Published as part of Rodrigues, Thaiana G. A. & Cardoso, Irene A., 2019, First record of four Pasiphaea Savigny, 1816 (Crustacea, Decapoda, Pasiphaeidae) species from the southwestern Atlantic, pp. 321-330 in Zootaxa 4560 (2) on page 323, DOI: 10.11646/zootaxa.4560.2.5, http://zenodo.org/record/2627697