Comprehensive Description

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Description

Pasiphaea berentsae n. sp.
Figs 7-9

 

Type material. New South Wales: HOLOTYPE: AM P26768, north-east of Norah Head, 33°11'S 152°24'E to 33°09'S 152°25'E, 720 m, demersal prawn trawl, Kapala (K77-23-10), 7 Dec 1977; 1 ♀ ovig. cl 47.2 mm. PARATYPES: AM P26797, north-east of Broken Bay, 33°27'S 152°09'E to 33°25'S 152°11'E, 874 m, demersal prawn trawl, Kapala (K77-23-13), 8 Dec 1977; 1 ♀, cl 43.1 mm. AM P26798, north-east of Broken Bay, 33°27'S 152°09'E to 33°25'S 152°11'E, 874 m, demersal prawn trawl, Kapala (K77-23­-13), 8 Dec 1977; 2 ♂, cl 29.0, 30.8 mm, 13 ♀, cl 33.0-44.1 mm. AM P26779, south-east of Broken Bay, 33°40-35'S 151°56-58'E, 714-732 m, demersal prawn trawl Kapala (K77-23-05), 6 Dec 1977; 5 ♀, cl 30.0-37.4 mm. USNM 211394, north-east of Broken Bay, 33°27'S 152°09'E to 33°25'S 152°11'E, 874 m, demersal prawn trawl, Kapala (K77-23-13), 8 Dec 1977; 1 ovig. ♀, cl 37.8 mm, 1 ♀, cl 43.2 mm.

 

Diagnosis. Carapace dorsally carinate. Abdominal somites 2-6 dorsally carinate. Posterior margin of telson deeply notched. Pereopod 1, merus armed with 0-3 spines; pereopod 2, merus armed with 12-17 spines, ischium with 0-1 spine, basis with 1-5 spines.

 

Description. Rostrum just reaching anterior carapace margin, directed obliquely upward, anteriorly narrowed into spine-like extremity, anterior margin oblique, slightly convex, straight, or slightly concave. Carapace dorsally carinate almost to posterior margin; with strong suprabranchial ridge extending almost to posterior margin; branchiostegalspine marginal, strong, non-carinate. Abdominal somite 1 dorsally rounded; somites 2-6 dorsally carinate, all somites lacking posterodorsal spine. Pleuron 1 ventrally straight; pleuron 2 broadly rounded, pleura 3 and 4 ventrally straight, with rounded lobe-like extension anteriorly; pleuron 5 subrectangular, ventral margin faintly concave. Somite 6 1.5X length of somite 5, subequal to telson in length. Telson dorsally grooved, posterior margin deeply cleft, bearing 7 pairs of spines.

 

Antenna 1, stylocerite twisted, distally acute, almost reaching distal margin of basal peduncular segment; segment 2 less than half length of basal segment, ventromesial margin with slight shoulder at about midlength. Antenna 2 overreaching peduncle of antenna 1 by slightly more than half of blade-length; scaphocerite with outer margin gently convex; distal spine extending well beyond apex of blade; strong elongate ventrodistal spine on peduncle segment 2.

 

Mouthparts as illustrated. Maxilliped 3 not quite reaching distal spine of scaphocerite; distal segment apically subacute, about 1.4X length of segment 2, with dense bands of spines on ventral margin, and subterminal clump of ventrally directed spines; segment 2 with dense patch of ventrodistal setae.

 

Pereopod 1 over-reaching scaphocerite by half length of fingers of chela; fingers about 0.6X length of palm; palm about 2.6X length of carpus; merus 4X length of carpus, with 0-3 spines on posterior margin.

 

Pereopod 2 over-reaching scaphocerite by length of fingers of chela; palm about 1.2X length of fingers; carpus slightly less than 1/4 length of palm, with strong ventrodistal spine; merus 7X length of carpus, with 12-17 spines on posterior margin; ischium with 0-1 posterior spine; basis with 1-5 posterior spines.

 

Pereopod 3 very slender, reaching to distal margin of merus of pereopod 1.

 

Pereopod 4 shorter than either pereopod 3 or 5, reaching to distal margin of carpus of pereopod 5; dactylus ovate, setose; propodus with dense band of setae on ventral margin. Pereopod 5 reaching to midlength of merus of pereopod 2; dactylus distally rounded, with fringe of setae on posteroventral margins; propodus almost 4X length of dactylus, 2.5X length of carpus.

 

Pleopod 1 of male, endopod roughly ovate, with rounded lobe bearing tiny hooks on mesial margin. Pleopod 2 of male with appendix masculina half length of appendix interna, bearing 12 elongate spines on mesial and distal margins.

 

Inner uropodal ramus exceeding telson by 1/4 of its length; outer ramus exceeding inner by 1/4 of its length.

 

Remarks. Pasiphaea berentsae differs from P. meiringnaudei Kensley, 1977, which it closely resembles, in having fewer spines on the segments of pereopod 2, in having a shorter stylocerite, a shallower telsonic notch, more spines on the appendix masculina, and in the female becoming ovigerous at a smaller size (cl 50 to 58 mm in the South African species).

 

While many of the diagnostic characters of this species agree with those of P. tarda Kroyer, the shape of the rostrum and the telsonic notch differ markedly.

 

The species is most easily separated from P. barnardi Yaldwyn, 1971, by the possession of spination on the bases of pereopod 2.

 

Etymology. The species is named for Penelope B. Berents of the Australian Museum, in thanks for her assistance with the sorting and cataloguing of the Kapala collection.

 

Distribution. Off New South Wales, 720-874 m.

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Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© National Museum of Natural History, Smithsonian Institution

Source: Antarctic Invertebrates Website (NMNH)

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