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

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Pasiphaea major Hayashi, 2006


Pasiphaea major Hayashi, 2006 

( Figure 2View 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), MNRJ 27921; St. 0 523, 19°42.569’S, 38°32.030’W, 922m, 1 female (37.21mm) and 1 male (55.20mm), MNRJ14620View MaterialsGoogleMaps  ; St. 0 496, 13°17.580’S, 38°17.599’W, 1717m, 1 male (71.25mm), MNRJ14613View MaterialsGoogleMaps  ; St. 0 524, 19°43.663’S, 38°39.838’W, 925m, 1 female (28.32mm), MNRJ27922View MaterialsGoogleMaps  ; St. 0 552, 21°07.493’S, 39°46.423’W, 1694m, 2 males (59.61mm– 69.35mm), MNRJ14604View MaterialsGoogleMaps  ; St. 0 551, 2107.780’S, 39°49.106’W, 1642m, 1 female (63.80mm), MNRJ14603View Materials  ; St. 0 548, 21°28.611’S, 39°40.303’W, depth 1799m, 1 male (67.30mm) and 1 female (80.36mm), MNRJ14609View MaterialsGoogleMaps  ; St. 0 505, 14°36.606’S, 38°49.345’W, 1089m, 1 female (59.29mm), MNRJ14619View MaterialsGoogleMaps  ; St. 0 519, 13°19.944’S, 38°19.654’W, 1730m, 1 male (61.52mm), MNRJ14618View MaterialsGoogleMaps  ; St. 0 550, 21°26.324’S, 39°49.113’W, 1598m, 1 male (57.20mm), MNRJ14612View MaterialsGoogleMaps  ; St. 0 526, 19°42.716’S, 38°36.497’W, 935m, 1 male (57.61mm), MNRJ27923View MaterialsGoogleMaps  ; St. 0 544, 21°24.306’S, 40°02.916’W, 1159m, 1 male (50.96mm) and 1 female (69.79mm), MNRJ14610View MaterialsGoogleMaps  ; St. 0 536, 20°24.008’S, 39°46.217’W, 1293m, 1 male (55.53mm) and 1 female (80.22mm), MNRJ14615View MaterialsGoogleMaps  ; St. 0 504, 19°42.734’S, 38°36.472’W, 910m, 1 female (32.01mm) and 1 male (61.22mm), MNRJ13692View MaterialsGoogleMaps  ; St. 0 502, 19°37’488’S, 38°41’909’W, 665–706m, 2 females (24.58mm– 28.05mm), MNRJ27925View Materials  ; St. 0 528, 19°45.258’S, 39°03.003’W, 1237m, 1 male (37.06mm), MNR 14606View Materials; St. 0 535, 19°58.936’S, 39°38.657’W, 1002m, 1 male (21.16mm) and 1 female (53.59mm), MNRJ14621View MaterialsGoogleMaps  . HABITATS, St. 8, 21°07’21.775”S, 39°38’21.365”W, 1890m, not sexed (20.80mm), MNRJ27924View MaterialsGoogleMaps  ; St. 13, 21°40’40.489’’S, 39°57’57.119’’W, 989.5m, 1 female (34.04mm), MNRJ27926View MaterialsGoogleMaps  ; St. 62; 23°9’51.124”S, 40°50’21.622’’W, 1244.4m, 1 female (19.55mm), MNRJ27927View MaterialsGoogleMaps  .

Diagnosis. Body robust. Rostrum with basal slit, apex not reaching or sometimes overreaching anterodorsal margin of carapace ( Fig. 2A, BView FIGURE 2). Carapace sharply carinate, sometimes with shallow depression near each side of rostral base ( Fig. 2A, BView FIGURE 2). Branchiostegal sinus large and deep; branchiostegal spine marginal or submarginal ( Fig. 2AView FIGURE 2). First pereopod with 2–10 spines on merus, unarmed on ischium and basis, posterodistal angle of basis bluntly produced, not dentiform ( Fig. 2CView FIGURE 2). 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. 2DView FIGURE 2). 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, FView FIGURE 2). Telson grooved in dorsal midline, posterior margin deeply forked with 8–11 pairs of spines ( Fig. 2G, HView FIGURE 2); 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. 2DView FIGURE 2) vs. 0–4 observed by Hayashi (2006a) and telson with 8 pairs of spines in most of the specimens herein examined ( Fig. 2HView FIGURE 2) 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, GView FIGURE 2) vs. slightly shorter in P. barnardi  ; first pereopod with 2–10 spines on merus ( Fig. 2CView FIGURE 2) vs. 0–6 spines; and second pereopod with 10–20 spines on merus and 0–1 spine on ischium ( Fig. 2DView FIGURE 2) vs. 7–21 spines on merus and 0–2 spine on ischium ( Hayashi, 2006a).














Pasiphaea major Hayashi, 2006

Rodrigues, Thaiana G. A. & Cardoso, Irene A. 2019

Pasiphaea major

De Grave, S. & Fransen, C. H. J. M. 2011: 258
Hayashi, K. I. 2006: 219