Paramphimonhystrella sinica, Huang & Zhang, 2006

Huang, Y. & Zhang, Z. N., 2006, A new genus and three new species of free-living marine nematodes from the Yellow Sea, China, Journal of Natural History 40 (1 - 2), pp. 5-16 : 13-14

Paramphimonhystrella sinica sp. nov.

( Tables V, VI; Figures 6 , 7 )

Type material

Two males and two females collected from Stations 152194 and 12494 ( Figure 1 ). Holotype: „ 1 (ZB0301100) slide number ZB030123413, Station 152194. Paratypes: one male (ZB0301101) ZB030115122, Station 12494 and two females (ZB0301102–03) ZB030115213, ZB030123413, Stations 12494 and 152194.

Paratype female 1: 1114 mm; a535.9, b55.8, c54.0, V548 %

11 30 31 22

Type locality

Benthic in the Yellow Sea. Station 152194: 32 ° 30.449N, 125 ° 28.219E, 73 m, MdØ 2.32, organic matter 1.05%; Station 12494: 33 ° 59.769N, 122 ° 59.859E, 68 m, MdØ 7.54, organic matter 2.78 %.

Etymology

This species is named for the type locality, the Yellow Sea of China .

Description Body length 1012–1142 mm; maximum body diameter 29–32 mm. Cuticle smooth. Head

extended. Buccal cavity widely cylindrico-conical. Ten cephalic setae, 5–8 mm long. Two groups of ten cervical setae each, first group at the level of the amphids, about 8 mm long; the second circle about 16 mm behind amphids, 19 mm long. Amphids circular, diameter 8–12 mm, about 17 mm from the head end. Tail 220–282 mm long, conico-cylindrical. Conical part about third of tail length; anal diameter 22–27 mm. Three terminal caudal setae, about 16 mm long.

Male. Spicules 26–34 mm long, slender with blunt tip. Gubernaculum and precloacal supplement lacking.

Female. A single anterior ovary; vulva at about 48–53% of body length.

Diagnosis and discussion

Paramphimonhystrella sinica sp. nov. is characterized by the circular amphids, extended head, broad buccal cavity, and cylindrical part of tail longer than conical part. It differs from Paramphimonhystrella elegans sp. nov. and Paramphimonhystrella minor sp. nov. by the structure of the head, the buccal cavity, the shape of amphids, and the proportion of cylindrical part of tail and conical part. In P. elegans sp. nov., the amphids are ovoid and the spicule has a hook at distal end, the cylindrical part of the tail is shorter than the conical part while in P. minor sp. nov. the body size is small, generally shorter than 800 mm, amphids are circular, but the head is not extended and the spicule has a sharp tip, not a hook at distal end, and cylindrical part of tail is about the same length as the conical part.

Figures

Figure 1. Map of distributed stations of new species in the Yellow Sea.

Figure 6. Paramphimonhystrella sinica sp. nov. (A) Lateral view of male head end, showing buccal cavity, amphids, and cervical setae; (B) lateral view of female body, showing position of vulva; (C) lateral view of male tail, showing spicule and terminal setae; (D) lateral view of female tail, showing caudal glands.

Figure 7. Paramphimonhystrella sinica sp. nov. (A) Lateral view of male head end, showing buccal cavity, amphid, and cervical setae; (B) lateral view of male tail, showing spicule and terminal setae.