Chauliopleona amftae, Guerrero-Kommritz, 2005

Guerrero-Kommritz, Jürgen, 2005, Review of the genus Chauliopleona Dojiri and Sieg, 1997 (Crustacea, Peracarida, Tanaidacea) and description of three new species, Journal of Natural History 39 (16), pp. 1177-1210 : 1195-1199

Chauliopleona amftae n. sp.

( Figures 9 , 10 )

Material examined

HOLOTYPE: non-ovigerous female, ZMH K-40230, Diva, RV Meteor, station 345, 16 ° 17.09S, 05 ° 27.09E, 5390 m, BC, 25 July 2000 . PARATYPE: non-ovigerous female, ZMH K-40231, Diva, RV Meteor, station 348, 16 ° 18.19S, 05 ° 27.09E, 5390 m, 16 ° 19.39S, 05 ° 27.29E, 5387 m, EBS, 28 July 2000 (dissected) .

Diagnosis

Cheliped merus with one ventral rounded protuberance with one simple seta on it.

Description

Body ( Figures 9 a–c). Slender, about 6.7 times as long as broad, cylindrical, 2.48–4.18 mm in length, cuticle strong. Cephalothorax about 1.4 times as long as broad, rounded tapering towards antennules. Pereonite 2 longest, pereonites 3 and 4 of equal length, pereonite 6 shortest. Pleon as long as cephalothorax, pleonites of equal length. Pleotelson apex rounded.

Antennule ( Figure 9d ). Article 1 with three small short and one long simple setae. Article 2 with one long terminal seta. Article 3 with three small lateral and two terminal setae. Article 4 with one short and four long terminal setae.

Antenna ( Figure 9e ). Article 1 short. Article 2 as long as wide, with one small distal seta. Article 3 with long simple seta. Article 4 longest, with one small lateral and one short and two long terminal setae. Article 5 about half length of 4, with one terminal simple seta. Article 6 very short, with four terminal setae, two long and two short.

Labrum ( Figure 10b ). Hood-like with fine marginal setules.

Mandible ( Figure 10c ). Well calcified and sclerotized on incisive margins, molar process developed, bearing about 10 terminal spinules.

Maxillule ( Figure 10e ). Endite setulose, with one large setulose, six large simple spines and one short terminal one. Palp with two terminal setae.

Maxilla ( Figure 10f ). Rectangular, naked.

Labium ( Figure 10d ). Composed of two pentagonal lobes with row of setules distally.

Maxilliped ( Figure 10h ). Endites with one short spiniform seta. Palp article 1 naked. Article 2 with one outer spiniform seta. Article 3 with four inner setae. Article 4 with three inner and three terminal setae.

Epignath ( Figure 10g ). Falciform.

Cheliped ( Figures 9f , 15d ). Basis as long as carpus. Merus triangular with one ventral rounded protuberance at mid-length, with one simple seta on top of it. Carpus about 1.5 times as long as broad with one ventral seta at mid-length. Carpal shield developed. Fixed finger with four teeth on inner margin, two ventral and three laterodorsal simple setae. Dactylus smooth with no special features.

Pereopod 1 ( Figure 10i ). Coxa without seta. Basis longer than three following articles together, with one simple seta at mid-length. Ischium with one small simple seta. Merus with one spiniform seta as long as carpus. Carpus with two rows of small setules and two terminal spiniform setae. Propodus with row of about 15 spinules, two small terminal spiniform setae. Unguis as long as dactylus.

Pereopod 2 ( Figure 10j ). Coxa without seta. Basis longer than the three following articles together, with one simple seta. Ischium with a small simple seta. Merus with one long terminal spiniform seta. Carpus with row of setules ventrally and three terminal spiniform and one simple setae. Propodus with one terminal spiniform seta and row of setules ventrally and around insertion of dactylus. Unguis pointed, about half as long as dactylus.

Pereopod 3 ( Figure 10k ). As pereopod 2, except carpus lacks simple seta and setulation on propodus less prominent.

Pereopod 4 ( Figure 10l ). Basis with two setulose seta. Ischium with two simple setae. Merus with two spiniform setae. Carpus with two long and one short spiniform setae. Propodus with three terminal spiniform setae. Dactylus with ventral groove bordered by proximally directed spinules. Unguis short and pointed.

Pereopod 5 ( Figure 10m ). As pereopod 4, except basis with one setulose seta, carpus with three long spiniform setae.

Pereopod 6 ( Figure 10n ). As pereopod 4, except basis with one simple and one setulose setae, carpus with three long and one short spiniform setae, propodus with four spiniform setae.

Pleopods ( Figure 9g ). Basis subtriangular. Exopod with about eight simple setae, endopod with bipinnate seta at base.

Uropods ( Figure 10a ). Basis rectangular naked. Exopod as long as basis, composed of two articles: article 1 with one long seta, article 2 with two terminal setae, one very long. Endopod article 1 with small terminal seta, article 2 with one short and four long terminal setae.

Type locality

Angola Basin , Diva, RV Meteor, station 345, 16 ° 17.09S, 05 ° 27.09E, 5390 m, KG, 25 July 2000 .

Etymology

The species is named after Diana Amft.

Remarks

This species resembles C. armata . It differs from the latter in the shape of the cephalothorax and the cheliped (see Figure 15a, d ).

Figures

Figure 9. Chauliopleona amftae n. sp., ZMH K-40231. (a) Dorsal view; (b) lateral view; (c) schematic ventral view of cephalothorax; (d) antennule; (e) antenna; (f) cheliped; (g) pleopod. Scale bars: 1 mm (a–c); 0.5 mm (d–g).

Figure 10. Chauliopleona amftae n. sp., ZMH K-40231. (a) Uropod; (b) labrum; (c) mandibles; (d) labium; (e) maxillule; (f) maxilla; (g) epignath; (h) maxilliped; (i) pereopod 1; (j) pereopod 2; (k) pereopod 3; (l) pereopod 4; (m) pereopod 5; (n) pereopod 6. Scale bar: 0.5 mm.

Figure 15. Chauliopleona chelipeds. (a) Ch. armata; (b) Ch. hastata; (c) Ch. nickeli; (d) Ch. amftae; (e) Ch. amdrupii; (f) Ch. paradoxa; (g) Ch. dentata. The chelipeds are not drawn to the same scale.