Paraleptognathia inermis (Hansen, 1913) new combination (Figs 11, 12)

Synonymy: Leptognathia inermis Hansen, 1913

Material examined: 14 individuals. Holotype ZMUC CRU 6821, North Iceland, RV ”Ingolf” St. 126, 67° 19´N 15° 52´W, 293 fm (536 m), one female, two neuters, other material: ZMH K­40536 RV ”Polarstern” St. 39, two females, ZMH K­39759 RV ”Polarstern” St. 179, six females, ZMH K­40532 RV ”Polarstern” St. 31­9, one female, ZMH K­40552 RV ”Polarstern” ARK IX­3 St. 155, two females.

Diagnosis: Cheliped carpal shield very prominent, carpus less then twice as long as wide.

Description: non­ovigerous female. Body (Fig. 11a, b): long, about 6.5 times longer than broad. Body length 2.2 to 3.9 mm. Cephalothorax (Fig. 11a, b): about 1.3 times longer than broad. Pereon (Fig. 11a, b): pereonite 6 shortest, pereonite 1 and 5 of equal length, pereonite 4 longer than 5 and equal to 3; pereonite 2 longest. Pleon (Fig. 11a, b): pleonites equal in length, with one lateral simple seta.

Antennule (Fig. 11c): article 1 longest (longer than the rest articles combined length) with one long simple and four short simple distal setae; article 2 with one long and one short distal setae; article 3 shortest, with three distal simple short setae; article 4 with four terminal setae and one aesthetasc.

Antenna (Fig. 11d): article 1 short semifused to cephalothorax; article 2 as long as broad, with one short spiniform seta; article 3 with one dorsal simple seta; article 4 with a constriction at midlength, two terminal long simple and at constriction one short simple setae; article 5 with one terminal simple seta and one at midlength; article 6 shortest, with four terminal simple setae.

Labrum (Fig. 12d): hood­shaped, with a row of setules on the distal margin.

Mandible (Fig. 12c): well calcified, pars molaris bent ventrally (one broken during dissection), lacinia mobilis broad and pointed.

Maxillula (Fig. 12a): endite with three dorsal and three ventral rows of setules; one thin, one pinnate and six simple terminal spiniform setae.

Maxilla (Fig. 12f): rectangular, smooth.

Labium (Fig. 12e): composed of two triangular lobes with three short distal setae.

Maxilliped (Fig. 12g): endites not fused, as broad as basis, no setae were observed on the basis.

Epignath (Fig. 12a): with no special features.

Cheliped (Fig. 11g): basis as long as carpus; merus with one ventral simple seta; carpus with one ventral and two short simple setae, with tubercle near insertion of chela, carpal shield developed, rounded; propodus about twice as long as dactylus, with four teeth at cutting edge; dactylus smooth.

Pereopod 1 (Fig. 11h): coxa naked; basis three times longer than wide, with a simple short seta; ischium short, with one simple seta; merus as long as carpus, with one spiniform seta; carpus with two spiniform setae; propodus with one terminal spine and a thin dorsal and a short spiniform ventral setae; dactylus smooth; unguis sharp.

Pereopod 2 (Fig. 11i): as pereopod 1, except carpus longer than merus, with three spiniform setae.

Pereopod 3 (Fig. 11j): as pereopod 1, except basis naked.

Pereopod 4 (Fig. 11k): basis about two and a half times longer than broad, with one setulose and one simple ventral seta; ischium short, with one long simple seta; merus with two spiniform setae; carpus longer than merus, with three spiniform setae; propodus longer than carpus, with three spiniform terminal setae; dactylus as long as propodus; unguis sharp.

Pereopod 5 (Fig. 11l): as pereopod 4, except basis with one extra dorsal simple seta; ischium with two simple setae; carpus with four spiniform setae.

Pereopod 6 (Fig. 11m): as pereopod 5, except basis with only one setulose seta; ischium with one simple seta; propodus with four spiniform setae.

Pleopods (Fig. 11e): exopod with nine simple long setae; endopod with ten simple long setae.

Uropods (Fig. 11f): exopod about half as long as first article of endopod. Exopod article 1 with a long simple seta; article 2 with one long simple terminal seta. Endopod article 1 with three distal simple setae; article 2 with five terminal setae.

Type locality: North Iceland, RV ”Ingolf” St. 126, 67° 19´N 15° 52´W, 293 fm (536 m) .

Distribution: North Atlantic Ocean, Iceland, Greenland Sea.

Remarks: this species is very similar to P. alba . The carpal shield on the carpus is better developed in P. inermis and the carpus is shorter in P. inermis than in P. alba .

Sieg (1986b) gives in his figures and description some features that were not observed in the present material like the setules on the maxilla, on pereopod 1 and 2, the absence of setules on the labium. Other differences are probably due to the style in which Sieg draw tanaids.