Chauliopleona amdrupii ( Hansen, 1913 ), 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 : 1184-1191

Chauliopleona amdrupii ( Hansen, 1913) new combination

( Figures 3, 4)

Leptognathia amdrupii Hansen 1913: 81 .

Material examined

HOLOTYPE: ZMUC CRU-5284 , Forsbald Fjörd , Greenland . Other material: one nonovigerous female, ZMH K-40228, Ark XI-2, RV Polarstern, station 37-16, 78 ° 58.259N, 07 ° 39.429W, 188 m, 78 ° 58.339N, 07 ° 40.059W, 191 m, EBS, 30 September 1995 .

Diagnosis

Cheliped lacks carpal shield. Pereopod 1 with two serrated setae on carpus.

Description

Body ( Figure 3 a–c). Cylindrical, about 7.7 times as long as broad, 2.7–3.2 mm in length. Cuticle strongly sclerotized. Cephalothorax 1.5 times as long as broad with straight margins, tapering anteriorly. Ventral groove around cheliped insertion. Pereonite 2 longest, pereonite 6 shortest, pereonites 3, 4 and 5 subequal. Pleon longer than cephalothorax, pleonites of similar width and length. Pleonite 5 longest. Pleotelson pentagonal.

Antennule ( Figure 3d). Article 1 longest, with two long thin and three small simple setae. Article 2 with one long seta and two small simple setae. Article 3 shortest, with two simple terminal setae. Article 4 with three long and two short simple terminal setae.

Antenna ( Figure 3e). Article 1 short. Article 2 as long as 3, unarmed. Article 3 as long as broad, with one small ventrodistal seta. Article 4 longest with two short and three long simple setae. Article 5 with one long terminal simple seta. Article 6 shortest with five long simple setae.

Labrum ( Figure 4a). Hood-like with fine marginal setules. Mandible ( Figure 4b). Well calcified and sclerotized on incisive margins. Molar process developed, slender, with about 10 distal spinules.

Maxillule ( Figure 4d). Endite with three large setulated, four large and two small simple terminal spines. Palp with two terminal setae.

Maxilla ( Figure 4e). Rectangular without setae.

Labium ( Figure 4c). Composed of two triangular lobes, with a row of small terminal setae.

Maxilliped ( Figure 4f). Endites with one lateral seta. Palp of four articles. Article 1 naked. Article 2 with three inner and one outer long setae. Article 3 with three inner setae. Article 4 with four curved setae.

Epignath. Not recovered.

Cheliped ( Figures 3f, 15e). Basis as long as carpus, divided unequally by sclerite. Merus triangular in shape with one ventral simple seta. Carpus 2.2 times as long as wide. One ventral and one dorsal simple seta. Carpal shield very weak or absent. Fixed finger with four small teeth, three dorsal and two ventral setae. Dactylus smooth.

Pereopod 1 ( Figure 4g). Coxa without seta. Basis longer than the three following articles together, with two simple setae. Ischium short, naked. Merus with one spiniform seta. Carpus with two serrated strong setae and a row of spines ventrally. Propodus with about seven short spines ventrally and one short terminal spine, one spiniform terminal and one simple setae. Dactylus about as long as unguis. Unguis pointed.

Pereopod 2 ( Figure 4h). As pereopod 1, basis with one simple seta, ischium with one seta, merus with one short and one long spiniform pinnate seta. Carpus with about four small spines, one long spiniform pinnate and two short spiniform setae.

Pereopod 3 ( Figure 4i). As pereopod 1, except ischium with seta, carpus with only three small spines and three spiniform setae.

Pereopod 4 ( Figure 4j). Basis longer than three following articles, with two simple setae. Ischium with one simple seta. Merus with two spiniform pinnate setae. Carpus with two long spiniform pinnate and one short spiniform setae and a mid-ventral row of spinules. Propodus with a mid-ventral row of spinules and three very sharp spiniform setae. Dactylus long with a mid-ventral groove bordered by proximally directed spinules. Unguis short and pointed.

Pereopod 5 ( Figure 4k). As pereopod 4, except basis with only one setulose seta.

Pereopod 6 ( Figure 4l). As pereopod 5, except basis with one simple seta, carpus with four spiniform setae and propodus with five spiniform terminal setae.

Pleopods ( Figure 3g). Basal article cuadrangular. Endopod and exopod rectangular, with 10 simple setae.

Uropods ( Figure 3h). Basal article naked. Exopod very short, less than 50% of article 1 of endopod. Article 1 as long as 2, each with one long terminal simple seta. Endopod article 1 with one long feathered and one short simple seta. Article 2 with four long simple setae.

Type locality

Forsbald Fjörd, Greenland.

Remarks

The redescription is based on the type specimen of Hansen (1913) and one specimen from south Greenland. Most of the drawings are from the specimen from south Greenland ( ZMH K-40228) .

Chauliopleona armata ( Hansen, 1913) new combination

( Figures 5, 6)

Leptognathia armata Hansen, 1913 .

Leptognathia armata: Nierstrasz 1913: 30 ; Stephensen 1933: 347.

Non Leptognathia armata Kudinova-Pasternak 1965: 82 ; 1970: 353; 1973: 154; 1975: 219; 1986: 67; Menzies and Mohr 1962: 196–197.

Material examined

TYPE: non-ovigerous female, ZMUC CRU- 5612, Ingolf expedition, station 22, 48 ° 259N, 58 ° 109W, 3474 m.

Diagnosis

Cephalothorax long, about 1.6 times as long as broad. Cheliped propodus and dactylus smooth and slender, carpal shield well developed and rounded.

Redescription

Body ( Figure 5 a–c). Long and slender, about eight times as long as broad, cylindrical, 3.6 mm in length, cuticle strong. Cephalothorax 1.6 times as long as broad, conical, ventral groove around cheliped insertion. Pereonite 6 shortest, 4 and 5 of equal length, pereonites 2 and 3 longest. Pleon longer than cephalothorax. Pleonites of equal length, pleonite 5 with posteriorly directed ventral spiniform process. Pleotelson pentagonal.

Antennule ( Figure 5d). Articles 1–3 naked, article 1 longest. Article 4 with five terminal simple long setae.

Antenna ( Figure 5e). Article 1 very short. Article 2 short, as long as third, naked. Article 3 naked. Article 4 longest, with two terminal simple long setae. Article 5 long and naked. Article 6 with two long and two short terminal setae.

Mouthparts. Mouthparts were not dissected.

Cheliped ( Figures 5f, 15a). Basis unequal, two-thirds of it proximal to insertion. Merus triangular and naked. Carpus broad, about 1.4 times as long as wide. Carpal shield well developed. Propodus 2.5 times as long as broad. Fixed finger with four teeth, one ventral and two dorsal simple setae. Dactylus smooth and slender.

Pereopod 1 ( Figure 6a). Coxa without setae. Basis longer than three following articles together, naked. Ischium with one seta. Merus with one long spiniform seta. Carpus with three long spiniform setae. Propodus with ventral row of eight short strong spinules and one short spiniform seta. Dactylus about as long as unguis. Unguis pointed.

Pereopod 2 ( Figure 6b). As pereopod 1, except carpus with only two long spiniform terminal setae. Propodus with a row of about 14 short strong spinules.

Pereopod 3 ( Figure 6c). As pereopod 1, except propodus without short spinules. Pereopod 4 ( Figure 6d). Basis longer than following three articles together, naked. Ischium short, naked. Merus with two spiniform setae. Carpus with two spiniform setae. Propodus with two short terminal spiniform setae. Dactylus long, with mid-ventral groove bordered by backwardly directed spinules. Unguis short and pointed.

Pereopod 5 ( Figure 6e). As pereopod 4, except carpus with three long spiniform setae. Propodus with three long spiniform setae.

Pereopod 6 ( Figure 6f). As pereopod 5.

Pleopods ( Figure 5g). Basal article square. Exopod and endopod only with five terminal simple setae.

Uropods ( Figure 5h). Basal article rhomboid. Exopod shorter than half of article 1 of endopod. Exopod of two subequal articles: article 1 with a simple terminal seta, article 2 with a long simple terminal seta. Endopod composed of two equally long articles: article 1 with one short simple terminal seta, article 2 with three long terminal simple setae.

Type locality

48 ° 259N, 58 ° 109W, 3474 m, station 22, Ingolf Expedition.

Remarks

For this species only the type material was available so that no dissection was possible to study mouthparts. This species is only present in the North Atlantic Ocean.