Paralibrotus Stephensen, 1923

Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), Zootaxa 3867 (1), pp. 1-92 : 45-47

Paralibrotus Stephensen, 1923

( Fig. 28 )

Paralibrotus Stephensen, 1923: 61 .—J.L. Barnard, 1969: 356.— Barnard & Karaman, 1991: 512.

Type species. Paralibrotus setosus Stephensen, 1923 , monotypy.

Included species. Paralibrotus includes 1 species: P. setosus Stephensen, 1923

Diagnostic description. Antenna 1 peduncle article 1 without anterodistal lobe; accessory flagellum forming cap covering callynophore. Antenna 2 without brush setae. Mandible molar a weakly setose flap. Maxilla 1 outer plate with 8 well developed setal-teeth in modified 7/4 crown. Maxilla 2 inner plate significantly shorter than outer plate. Gnathopod 1 simple; coxa 1 large, about as long as coxa 2, subrectangular with straight anterior margin; ischium short (length less than 2 × breadth); carpus short (length 1 to 2 × breadth); propodus margins tapering distally. Uropod 2 inner ramus not constricted. Telson entire .

Remarks. Paralibrotus has a number of highly derived characters which make it difficult to characterize. Based on the gnathopod 1 large coxa and short carpus, and an entire telson it is most similar to Onisimus . It differs mainly in the reduced flap-like molar and the simple first gnathopod.

Figures

FIGURE 28. Paralibrotus setosus Stephensen, 1923, paratype male, 9 mm, ZMUC, from west Greenland; female, 8.5 mm, AM P.35572, from north-west Greenland. Scale bars: antennae, gnathopods, pereopods, 0.2 mm; remainder, 0.1 mm.