Siambathynella, Camacho & Watiroyram & Brancelj, 2011

Camacho, A. I., Watiroyram, S. & Brancelj, A., 2011, The first record of Bathynellacea from Thailand: a new genus and species of Parabathynellidae (Crustacea: Syncarida), Journal of Natural History 45 (45 - 46), pp. 2841-2854 : 2844

Siambathynella gen. nov.

Generic diagnosis

Antennule (A.I) seven-segmented, without aesthetascs on fifth segment and with subterminal aesthetascs on last segment, sexually dimorphic, with male antennal organ on second segment of antennule. Antenna (A.II) six-segmented, first, second and fifth segments without setae. Mandible (Md) with expanded distal claw on pars molaris. Maxilla (Mx.II) with four segments. Exopod of thoracopods II–VII each two-segmented, that of Th I one-segmented; basipod of thoracopods I–VII with one smooth seta; epipod of Th I absent. Male thoracopod (Th) VIII: almost square, with small endopod integrated into basipod and with two smooth long setae; exopod, large, rectangular, twice as long as wide, overhanging basipod with three strong teeth or spinules; inner lobe incorporated into basal region, rectangular, a little shorter than dentate lobe; reduced outer lobe, fused to basipod; basipod very large, rectangular, slightly recurved and with a row of small denticles on distal part, proximal side with two lobes, one of which recurved inwards and almost completely covering the exopod, without seta. Th VIII female: triangular, with two long setae. Pleopods absent. Ventrolateral seta of pleotelson long, barbed and placed adjacent to insertion of furca. Sympod of uropod with few spines (usually eight), the distal one twice as long as rest; endopod with a spinous projection on the distal outer corner and with one strong spine ornamented with rows of setules.