Polkamenes, de Gier & Fransen, 2023

de Gier, Werner & Fransen, Charles H. J. M., 2023, Polka-dotted treasures: Revising a clade of ascidian- and bivalve-associated shrimps (Caridea: Palaemonidae), Contributions to Zoology 92 (3), pp. 179-282 : 244

Key to the species of Polkamenes

1. Ambulatory pereiopods with dactyli simple, not biunguiculate.................. P. liui

– Ambulatory pereiopods with dactyli biunguiculate.................................................2

2. First pereiopod chela with cutting edges minutely pectinate......................................3

– First pereiopods with cutting edges entire, not minutely pectinate............. ....................................................... P. spondylis

3. Anterior margin of basal segment of antennular peduncle rounded; accessory tooth of ambulatory dactyli not ventrally bifurcate.............. P. pycnodontae

– Anterior margin of basal segment of antennular peduncle with tooth; accessory tooth of ambulatory dactyli usually ventrally bifurcate.......................... P. nobilii