Pasiphaea tarda Krøyer, 1845

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 : 324

Pasiphaea tarda Krøyer, 1845

( Figure 4 )

Pasiphaea tarda Krøyer, 1845: 453 ; Matthews & Pinnoi 1973: 139; Hayashi, 2006a: 234 –237; De Grave & Fransen, 2011: 259. Pasiphaea princeps — Rathbun, 1904: 23.

Pasiphaea principalis Sund, 1913: 6 ; De Man 1920: 2.

Material Examined. REVIZEE, St. 0 506, 19°42.716’S, 38°36.497’W, 935m, 1 female (70.44mm), MNRJ13737; St. 0 524, 19°43.663´S, 38°39.838’W, 925m, 1 male (47.33mm), MNRJ14605 ; St. 0 535, 19°58.936’S, 39°38.657’W, 1002m, 1 female (68.27mm), MNRJ26957 . HABITATS, St. 13, 989m, 1 female (78.73mm), MNRJ26956 .

Diagnosis: Body soft, but not fragile. Rostrum short, with basal slit; apex distinctly overreaching anterodorsal margin of carapace. Carapace acutely carinate with shallow depression at each side of rostral base ( Fig. 4A, B ). Branchiostegal sinus deep; branchiostegal spine small, marginal ( Fig. 4A ). First pereopod with 4–8 spines on merus, unarmed on ischium and basis, posterodistal angle of basis produced, but not dentiform ( Fig. 4C ). Second pereopod with 13–24 spines on merus, 0–1 spine on ischium and 1–7 spines and posterodistal tooth on basis ( Fig. 4D ). First abdominal somite with dorsal carina on distal half; second to fifth abdominal somites carinate; sixth abdominal somite with dorsal carina on proximal half ( Fig. 4E, F ). Telson grooved in dorsal midline, posterior margin moderately or deeply forked, with 8–12 pairs of spines ( Fig. 4G, H ); telson shorter than sixth somite. Pleurobranch on the eighth thoracic somite (modified from Hayashi, 2006a).

Distribution: Type locality: Atlantic Ocean, South Greenland (unknown location). Southern Canary Islands, South Carolina (American coast) and Angola. New record: Brazil (Espírito Santo). Depth: 250 – 2400m.

Remarks: Pasiphaea tarda is included in P. alcocki species group and differs from its close related species Pasiphaea multidentata Esmark, 1866 by the basis of second pereopod with 2–4 spines ( Fig. 4D ) vs. more than 6 spines ( Fig. 4A ) ( Matthews & Pinnoi, 1973).

Figures

FIGURE 4. Pasiphaea tarda Krøyer, 1845, male (cl: 47.33mm), MNRJ14605. A. Carapace, lateral view; B. Carapace, dorsal view; C. Right first pereopod, lateral view; D. Right second pereopod, lateral view; E. Sixth abdominal somite, lateral view; F. Sixth abdominal somite, dorsal view; G. Telson, dorsal view; H. Posterior margin of telson, dorsal view.