The Homolidae of the Hawaiian Islands, with notes on the taxonomy of Moloha major (Kubo, 1936) (Crustacea: Decapoda: Brachyura) Author Ng, Peter K. L. Author Forges, Bertrand Richer De Author Martin, Joel W. text Zootaxa 2020 2020-07-07 4809 2 306 328 journal article 10.11646/zootaxa.4809.2.4 1175-5326 3934146 7DD95C27-8BEF-467A-B24F-B43C7665B1A9 Key to the known species of Homolidae in the Hawaiian Islands 1. Pereopod 5 merus clearly longer than carapace length (including rostrum).......................... Latreillopsis okala - Pereopod 5 merus shorter than carapace length (including rostrum.............................................. 2 2. Rostrum with pair of dorsal spines, directed anterolaterally, forming trident; carapace with long lateral spine at base of cervical groove and long upright median gastric spine............................................. Homologenus namakae - Rostrum simple or at most bifid, never tridendate; carapace margin at base of cervical groove unarmed or with spines of similar length to other carapace spines; without long median gastric spine.............................................. 3 3. P5 merus long, reaching anteriorly to level of orbit when folded anteriorly.............................. Moloha major - P5 merus relatively short, not reaching anteriorly to the level of orbit when folded anteriorly......................... 4 4. Pseudorostral spines well developed, as long as or longer than rostrum........................................... 5 - Pseudorostral spines small, conical, much shorter than rostrum................................................. 6 5. P5 merus very slender, length more than 10 times width.................................... Yaldwynopsis hawaiiana - P5 merus relatively stout, length about 7 times width........................................... Paramola japonica 6. Anterior wall of carapace either side of rostrum with elongated, transverse cavity forming orbit-like structure. Outer surface of cheliped palm with dark-coloured sunken depression at base of pollex in males and some females..................... 7 - Anterior wall of carapace lateral to rostrum rounded, without orbit-like structure. Outer surface of cheliped palm never with dark-coloured sunken depression at base of pollex........................................................... 8 7. Cheliped pollex straight, alignedt with rest of ventral margin of chela; outer surface of chela with scattered granules on median part, lateral parts more distinctly granulated; P2–P4 long......................................... Lamoha williamsi - Cheliped pollex bent at an angle from ventral margin of chela; outer surface of chela covered with numerous prominent granules on entire surface; P2–P4 proportionately shorter........................................... Lamoha personata 8. Only extremity of tip of rostrum slightly bifurcated, not easily visible.............................. Homola dickinsoni - Tip of rostrum clearly bifid even without magnification......................................... Homola orientalis