Petalomera, STIMPSON, 1858

McLay, Colin L. & Ng, Peter K. L., 2007, Revision Of The Indo-West Pacific Sponge Crabs Of The Genus Petalomera Stimpson, 1858 (Decapoda: Brachyura: Dromiidae), Raffles Bulletin of Zoology 55 (1), pp. 107-120 : 109

Key to species of Petalomera

1. Carapace margin behind lateral rostral teeth distinctly eave-like, merus of P3 petaloid ............................................................. 2

– Carapace margin behind lateral rostral teeth not eave-like, merus of P3 flattened but not petaloid ............................................ 3

2. Carapace surface sparsely granulate; eave-like carapace margin behind lateral rostral teeth distinctly not granulate; three distinct anterolateral teeth; length to width of ratio of propodus of P3 and P4 less than 1.0, dactyli strongly hooked but not opposable to the small propodal spines ..................................................... ............................................ Petalomera pulchra Miers, 1884

– Carapace covered in small rounded granules; carapace margin behind rostral teeth weakly eave-like granulate; three broad, granulated anterolateral teeth (less clear because of granules); length to width of ratio of propodus of P3 and P4 more than 1.0, dactyli curved and opposable to large propodal spines ........... .............................................. Petalomera longipes Ihle, 1913

3. Carapace highly domed, surface covered with large blunt granules (may be areolate) especially on anterior half; carapace regions not marked by deep grooves; no distinct anterolateral teeth; dactyli of P4 and P5 opposable to propodal spines ....... ................................... Petalomera granulata Stimpson, 1858

– Carapace not highly domed, surface covered with unevenly distributed vesiculous granules; carapace regions marked by deep grooves; variable number of small granular anterolateral teeth; dactyli of P4 and P5 not opposable to propodal spines.. ............................................ Petalomera indica Alcock, 1900