Tumidochelia dentifera ( G.O. Sars, 1896 ) G.O. Sars, 1896

Larsen, Kim & Shimomura, Michitaka, 2007, Tanaidacea (Crustacea: Peracarida) from Japan. II. Tanaidomorpha from the East China Sea, the West Pacific Ocean and the Nansei Islands, Zootaxa 1464, pp. 1-43 : 8-9

Tumidochelia dentifera ( G.O. Sars, 1896) new comb.

( Fig. 3 )

Leptognathia dentifera G.O. Sars, 1896

Material. Syntypes, 8 non-ovigerous females, 1 ovigerous female, ( NHMO F15188), Christiania Fjord (Olso Fjord) 113– 188 m.

Supplementary description (appendages of dissected paratype).

FEMALE.

Mouthparts. Labrum apex curved and setose ( Fig. 3 A). Right Mandible ( Fig. 3 B) incisor with three acute denticles. Labium ( Fig. 3 C) with one pair of lobes, without process at outer corners. Maxillule ( Fig. 3 D) endite with eight terminal spiniform setae of which two are setulose; palp not recovered. Maxilla ( Fig. 3 E) narrow and fairly large (half as long as maxillule endite). Maxilliped ( Fig. 3 F) endites with blunt distal process, fairly wide (almost as wide as basis). Basis fused. Palp article 1 naked; article 2 with two inner setae; article 3 with three inner setae; article 4 with four setae.

Cheliped ( Fig. 3 G). Attachment via large sclerite. Basis naked, narrow in posterior part, approximately as long as carpus. Merus with one ventral seta. Carpus widening distally, with small dorsodistal seta and one simple ventrodistal seta, ventrodistal part inflated, extending distally past propodus articulation. Propodus shorter than basis, with two simple ventral setae mid-length, and three small distal setae proximal to dactylus. Fixed finger displaying two spines and three setae on inner margin. Dactylus naked.

Remarks. Tumidochelia dentifera is very close to T. knighti , but apart from the large distance between the type localities, the obvious fusion line on the antenna article 3 and the longer uropodal exopod of T. dentifera is sufficient to discriminate between these species.

As with the species above L. dentifera is here transferred to Tumidochelia due to the biramous uropod with a spiniform process on the basal article; the short antennule article 1 and long article 2. The cheliped carpal shield is not described ( G.O. Sars 1896:30) and the illustration ( G.O. Sars 1896:p.142, pl1) is not clear regarding this character. However, examination of the syntypes confirms the presence of this character ( Fig. 3 G) in all specimens and we suspect that Sars illustrated the inner side of the cheliped, thus obscuring this character.

Figures

FIGURE 3. Tumidochelia dentifera G. O. Sars, 1896, syntype, female. A, labrum; B, right mandible; C, labium; D, maxillule; E, maxilla; F, maxilliped; G, cheliped. Scale bars = 0.2 mm.