Homolidae, De Haan, 1839

Ng, Peter K. L., Forges, Bertrand Richer De & Martin, Joel W., 2020, The Homolidae of the Hawaiian Islands, with notes on the taxonomy of Moloha major (Kubo, 1936) (Crustacea: Decapoda: Brachyura), Zootaxa 4809 (2), pp. 306-328 : 325-326

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