Comprehensive Description

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Description

Parharpinia obliqua, n.sp.

 

Occurrence: 1. St. 136. South Georgia. 1 ♂11 mm. 2. St. 175. South Shetlands. 1 ♀ 15 mm.

 

Description. Body dorsally rounded, glabrous. Hood flattened, apex in dorsal view rounded (cf. Sars, pl. Paraphoxus oculatus). Eyes black, in ♂ large, obliquely ovate, nearly meeting dorsally, in small, oval. Side-plates 1-4 fringed with setae on lower margin; 1 scarcely widened below, 4 as deep as long, excavation shallow. Postero­inferior angle of pleon segment 3 rounded, with an oblique row of long spine-setae; segment 4 with evenly rounded dorsal profile. Telson with the lobes apically rounded, a spine and a setule in a little notch towards the outer margin.

 

Antenna 1, 2nd joint with long setae on lower margin in ♀, flagellum 12 jointed in ♂, 11-jointed in ♀, accessory flagellum 8-jointed in ♂, 7 in ♀. Antenna 2, 4th joint expanded below, but width not more than two-thirds length, lower margin with very long spine-setae, upper margin in y with some long setae on inner side, on outer side a series of about 14 very strong outstanding spines, in ♂ with thick fringe of setae, 5th joint in ♀ also with very long setae on lower margin and strong outstanding spines on upper outer margin, the latter consisting of 4 in the middle of the joint, 2 towards the apex, in ♂ upper margin with 8-9 fascicles of setae and 8-9 calceoli, flagellum 12-jointed in ♀, multiarticulate and calceoliferous in ♂. Third palpal joint of mandible equal to 1st and 2nd together. Maxilliped, outer plate easily extending beyond middle of 2nd joint of palp, fringed on inner margin with about 12 graduated serrate spines, with 2-3 plumose spine-setae distally.

 

Gnathopods 1 and 2, similar to Tattersall's figure of villosa (1922, pl. i, figs. 9, 10) but 5th joint in gnathopod 1 measured along its upper margin nearly as long as 6th joint.

 

Peraeopods 1 and 2, 4th joint stout as in villosa. Peraeopod 3, 2nd joint pyriform, anterior margin straight, with a few long setae, posterior margin gently convex, with minute setules, 4th and 5th joints nearly as villosa. Peraeopod 4, 2nd joint stout, anterior margin angularly rounded, strongly setose, especially distally where the setae are plumose and form a thick fringe, hind margin slightly concave in ♀, straight in ♂, with a small rounded lobe distally. Peraeopod 5, 2nd joint almost subcircularly ex­panded, extending to end of 4th joint, margin shallowly notched, 3rd joint somewhat lobed on anterior apex, 4th with anterior margin convex, hind apex produced in a short acute lobe.

 

Uropod 2, peduncle fringed with upstanding spines on upper margin. Uropod 3, peduncle with a half circlet of spines around the lower apex, inner ramus two-thirds length of outer in y, in S rami subequal, much enlarged, with long plumose setae.

 

Remarks. Stebbing has recorded the Australian Pontharpinia rostrata (Dana) from the Falkland Islands (1914, p. 357), but the present species will not fit in with his 1906 diagnosis as regards the maxilliped, gnathopods and 3rd-5th peraeopods. The cha­racters of peraeopods 3-5 also differentiate it from the West Australian specimen which Tattersall referred to villosa.

 

It bears a close resemblance to Paraphoxus pyripes, Brnrd. (1930, p. 332, fig. 1o), as regards peraeopods 3-5, though the postero-inferior angle of pleon segment 3 is quad­rate in the latter; the present form, however, has a 2-jointed palp on maxilla 1.

 

The S was caught near the surface in a night haul.

 

The specific name refers to the oblique row of setae on the epimeron of pleon segment 3.”

 

 

(Barnard, 1932: 101-102)

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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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