Chauliopleona nickeli, 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 : 1203-1208

Chauliopleona nickeli n. sp.

( Figures 13 , 14 )

Material examined

HOLOTYPE: non-ovigerous female, ZMH K-40249, ANT XV/3, RV Polarstern, station 48– 89, 73 ° 27.59S, 22 ° 43.109W, 1583 m, 73 ° 27.909S, 22 ° 47.89W, 1573 m, EBS, 4 February 1998 . PARATYPES: three non-ovigerous females, ZMH K-40250, ANT XV/3, RV Polarstern, station 48–89, 73 ° 27.59S, 22 ° 43.109W, 1583 m, 73 ° 27.909S, 22 ° 47.89W, 1573 m, EBS, 4 February 1998; 11 non-ovigerous females, ZMH K-40251, ANT XV/3, RV Polarstern, station 48–272, 71 ° 27.59S, 15 ° 06.59W, 2007 m, 71 ° 30.49S, 15 ° 13.39W, 2061 m, EBS, 26 February 1998 (one dissected) .

Diagnosis

Cheliped propodus crenulated dorsally at dactylus insertion.

Description

Body ( Figure 13 a–c). About 6.4 times as long as broad, cylindrical, 2.38–3.5 mm in length. Cuticle strong. Cephalothorax about 1.5 times as long as broad. Ventral groove around cheliped insertion. Pereonite 2 longest. Pereonite 6 shortest, pereonites 4 and 5 of equal length. Pleon longer than cephalothorax. Pleonites 1–4 of similar length, pleonite 5 longest. Pleotelson rounded.

Antennule ( Figure 13d ). Article 1 as long as all other articles together, with one terminal seta and two small lateral setae. Article 2 with one long distal simple seta. Article 3 with two terminal setae, one long and one short. Article 4 with four terminal setae and one aesthetasc.

Antenna ( Figure 13e ). Article 1 very short. Article 2 square. Article 3 short with one seta distally. Article 4 longest with one short and three long distal simple setae. Article 5 as long as 1. Article 6 shortest with five terminal setae.

Labrum ( Figure 14a ). Hood-like with fine marginal setules.

Mandible ( Figure 14b ). Well calcified and sclerotized on incisive margins, molar process developed, broad, bearing about 10 distal spinules.

Maxillule ( Figure 14d ). Endite setulated, with seven setulated setae and one small simple terminal spine. Palp with two terminal setae.

Maxilla ( Figure 14e ). Rectangular, with one row of setules distally.

Labium ( Figure 14c ). Composed of two triangular lobes, naked.

Maxilliped ( Figure 14g ). One long simple seta on each side of basis at attachment of palp, endites naked. Palp article 1 naked. Article 2 with one outer and three inner curved setae. Article 3 with three inner setae. Article 4 with four terminal setae.

Epignath ( Figure 14f ). Falciform.

Cheliped ( Figure 13f , 15c ). Basis naked, as long as carpus. Merus triangular, with one seta. Carpus about 1.2 times as long as broad, with one mid-ventral simple seta and one dorsodistal simple seta, and rounded protuberance at end of shield. Carpal shield developed. Fixed finger with two simple ventral setae and three dorsal setae at level of propodus and three dorsal teeth. Insertion margin of propodus crenulated. Dactylus smooth.

Pereopod 1 ( Figure 14h ). Coxa without seta. Basis smooth. Ischium short, with one seta. Merus triangular in shape with one spiniform ventral seta as long as carpus. Carpus with two spiniform setae and a row of spinules ventrally. Propodus with about 14 fine spines ventrally, one strong seta distally, half length of dactylus. Dactylus about as long as unguis. Unguis short and pointed.

Pereopod 2 ( Figure 14i ). As pereopod 1 except basis with one seta, carpus with three terminal spiniform setae.

Pereopod 3 ( Figure 14j ). As pereopod 1.

Pereopod 4 ( Figure 14k ). Basis with two setulose setae. Ischium with one seta. Merus of triangular shape with two spiniform setae. Carpus with three spiniform setae. Propodus with three terminal spiniform setae. Dactylus longer than propodus, with ventral groove bordered with proximally directed spinules. Unguis short and pointed.

Pereopod 5 ( Figure 14l ). As pereopod 4, except basis with one simple seta and propodus longer than dactylus.

Pereopod 6 ( Figure 14m ). As pereopod 5, except propodus with four terminal spiniform setae.

Pleopods ( Figure 13g ). Basal article triangular, exopod and endopod with simple strong setae.

Uropods ( Figure 13h ). Basal article longer than wide. Exopod shorter than basis, composed of two articles: article 1 with one terminal seta, article 2 with one terminal seta as long as exopod. Endopod composed of two long articles: article 1 with two and article 2 with five simple terminal setae.

Type locality

Weddel Sea, ANT XV/3, RV Polarstern, station 48–89, 73 ° 27.59S, 22 ° 43.109W– 73 ° 27.909S, 22 ° 47.89W, 1583– 1573 m, EBS, 4 February 1998 .

Etymology

This species is named after Jörg Nickel, a colleague and friend.

Remarks

The C. armata reported from the South Pacific, Indian Ocean and Antarctic waters by Kudinova-Pasternak (1986) are probably C. nickeli n. sp. or a closely similar species. Material from the reference collection of Jürgen Sieg from Kerguelen Island are close to C. nickeli n. sp., unfortunately they are not in good enough condition to make a description. The material of Vanhöffen (1914) referred to Leptognathia sp., could not be found for comparison but it is very probable that it belongs to C. nickeli n. sp.

Figures

Figure 13. Chauliopleona nickeli n. sp., ZMH K-40251. (a) Dorsal view; (b) lateral view; (c) ventral view of cephalothorax; (d) antennule; (e) antenna; (f) cheliped; (g) pleopod; (h) uropod. Scale bars: 1 mm (a–c); 0.5 mm (d–h).

Figure 14. Chauliopleona nickeli n. sp., ZMH K-40251. (a) Labrum; (b) mandibles; (c) labium; (d) maxillule; (e) maxilla; (f) epignath; (g) maxilliped; (h) pereopod 1; (i) pereopod 2; (j) pereopod 3; (k) pereopod 4; (l) pereopod 5; (m) pereopod 6. Scale bars: 0.5 mm (a–c, e–m); 0.1 mm (d).

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.