Socotra, Cumberlidge & Wranik, 2002

Cumberlidge, Neil & Wranik, Wolfgang, 2002, A new genus and new species of freshwater crab (Potamoidea, Potamidae) from Socotra Island, Yemen, Journal of Natural History 36 (1), pp. 51-64 : 52-53

Socotra n. gen.

Type species. Socotra pseudocardisoma n. sp., by monotypy.

Diagnosis. Cephalothorax heart-shaped (cw>cl): highly arched (ch/fw 1.9), very wide (cw/fw 5.3), very long (cl/fw 3.6); front very narrow (fw/cw 0.2). Postfrontal crest low, faint, complete, ends curving forward to meet anterolateral margins at epibranchial teeth; mid-groove between epigastric crests long, ¯at, wide, forked at posterior end. Exorbital tooth small, low, blunt; epibranchial tooth reduced, almost undetectable; anterolateral margin between exorbital, epibranchial teeth extremely short, lacking intermediate tooth; anterolateral margin posterior to epibranchial tooth forming smooth raised rim. Front sharply deēxed, meeting inferior margins of antennulular fossae so that antennules almost completely enclosed within fossae. Exopod of third maxilliped distinctly widened at midpoint, base; tip narrow (i.e. not long columnar with parallel sides). Third sternal sulcus (s3/s4) reduced to two short notches at lateral edges of sternum; anterior margin of sterno-abdomina l cavity almost reaching s3/s4 junction. Episternal sulci s4/e4 to s7/e7 not visible. Gonopod 1 long, extending anteriorly as far as s4/s5. Terminal article of gonopod 1 relatively long (about one-third as long as subterminal segment).

Distribution. Socotra is known only from the type locality (®gure 5). Unveri®ed local reports of its occurrence from other localities (e.g. Homhil) have been treated with caution, because local people use one word (`hanchio ’) to describe all crabs, regardless of species.