Synonymy: Akanthophoreus multiserratus Sieg, 1986
Leptognathia multiserrata Hansen, 1913
Material examined: Five individuals. Holotype ZMUC CRU 7430 RV ”Ingolf” St. 4, 64° 07´N 11° 12´W, 237 fm (450 m), one female, one manca. Other material: ZMB 27518 Faroe Bank Channel St. 11B1 61° 00´N 7° 30´W, 862 m, one female, ZMUC CRU 3959, Faroe, Bordoy Island, Kalksvig Indlobit Til, 20–25 m, 22. 9.1926, two females.
Diagnosi s: Cheliped carpal shield with crenulation, propodus and dactylus with crenulation.
Description: nonovigerous female. Body (Fig. 16a, b): long, about 8.3 times longer than broad. Body length 2.9 to 3.5 mm. Cephalothorax (Fig. 16a, b): long, about 1.7 times longer than broad. Pereon (Fig. 16a, b): pereonite 1 as long as pereonite 6 and shorter than pereonite 5; pereonite 2, 3, and 4 of equal length and longer than 5. Pleon (Fig. 16a, b): pleonite one longest, pleonites 2, 3, 4, 5 subequal.
Antennule (Fig. 16c): article 1 longest, with one simple distal and three short setae; article 2 with one long and one short distal setae; article 3 shortest, with one distal simple seta; article 4 with five terminal setae.
Antenna (Fig. 16d): article 1 short, semifused to cephalothorax; article 2 as long as broad; article 3 with one dorsal simple seta; article 4 with two terminal long simple and two short setae; article 5 with two terminal simple setae; article 6 shortest, with four terminal simple setae.
Labrum (Fig. 16g): hoodshaped, with a row of distal setules.
Mandible (Fig. 17b): well calcified, pars molaris turned inwards and downwards; lacinia mobilis broad and blunt on distal edge.
Maxillula (Fig. 17c): endite with four rows of setules ventrally and one short, two pinnate and five simple terminal spiniform setae.
Maxilla (Fig. 17d): triangular, naked.
Labium (Fig. 17f): composed of two lobes with two short simple setae distally.
Maxilliped (Fig. 17h): endites not fused, basis heartshaped, palpus relatively large.
Epignath (Fig. 17e): with no particular feature.
Cheliped (Fig. 16g, 17a): basis as long as carpus; merus with one ventral simple seta; carpus with two ventral and one dorsal setae, one tubercle near insertion of chela; carpal shield moderately developed, with row of tubercles in the lower margin; propodus with three dorsal tubercles near insertion of dactylus, and a row of lateral tubercles at ventral setae level, three teeth at cutting edge; dactylus with a row of tubercles on the dorsal margin.
Pereopod 1 (Fig. 16h): coxa naked; basis about three and a half times longer than broad; ischium short, with one simple seta; merus with one spiniform seta; carpus longer than merus, with two spiniform setae; propodus with one terminal short spiniform seta; dactylus smooth; unguis as long as dactylus.
Pereopod 2 (Fig. 16i): as pereopod 1, except carpus with three spiniform setae.
Pereopod 3 (Fig. 16j): as pereopod 2.
Pereopod 4 (Fig. 16k): basis about three and a half times longer than wide; ischium short, with a short simple seta; merus with one spiniform seta; carpus with three spiniform setae; propodus with three terminal spiniform setae; dactylus short; unguis as long as dactylus.
Pereopod 5 (Fig. 16l): as pereopod 4, except basis with two setulose setae, ischium with two simple setae, merus with two spiniform setae.
Pereopod 6 (Fig. 16m): as pereopod 4, except basis with two simple setae; merus with two spiniform setae and propodus with four spiniform setae.
Pleopods (Fig. 16e): exopod with 18 simple long setae, endopod with eleven simple long setae.
Uropods (Fig. 16f): Exopod less than half as long as article 1 of endopod. Exopod article 1 with one long distal seta; article 2 with one long terminal seta. Endopod article 1 with two distal short setae; article 2 with four terminal setae.
Manca body length 1.5 mm.
Type locality: East of Iceland, RV ” Ingolf” St. 4, 64° 07´N 11° 12´W, 237 fm (450 m).
Distribution: this species occurs in the North Atlantic from the Faroe Islands to the east of Iceland.
Remarks: this species can be easily distinguish from all other Paraleptognathia species from the North Atlantic by a well developed carpal shield on the cheliped with a prominent crenulation as well as a strong crenulation on the propodus.