Tavares, 1998
Carapace well calcified, flat and sculptured. Front subtriangular. Lateral margin clearly delimited dorsally and ventrally, and frontal supraorbital margin half as long as carapace width. Orbit continuous to antennal cavity; infraorbital lobe located at middle and attached to ocular- and antennal cavities. Supra and inferior orbital margin distinct.
Outer orbital tooth distinct. Ocular peduncle movable, short, running transversally. Antennae remarkable and robust; 1st article of antennule movable, 2-3 articles forming a large plate. Endostome shortly advanced.
Lateral margin of buccal cavity elongate, reaching antennal 2-3 articles.
Third maxilliped tightly attached to lateral margin of buccal cavity; Maxillipeds 1-3 exopodite with normal flagellum. Third maxilliped exopod tapering, very long, reaching distal margin of merus; palp of distal margin of merus depressed dorso-ventrally. Second maxilliped propodus terminated. Chelipeds equal. P2-3 similar, without setae, not ornamented; dactylus compressed. P4-5 similar; P5 ischium twice length of P4 ischium. P4-5 reduced, however coxae normal in form; dactyli deflexed to lateral surfaces of propodi. Abdominal cavity obscurely engraved. Female abdomen consists of 7 equal segment; 1 abdominal segment covering P5 coxae.
In Genkaia and Lonchodactylus female Pl 1 vestigial, uniramous, inserted under Pl 1. In Phyllotymolinum female Pl 1 absent. Pl 2-5 biramous; Pl 5 very short, bearing no eggs. Uropods absent in male and female. Male abdomen of 7 segments (after Tavares, 1998)
Genus treated:
genus Genkaia Miyake & Takeda, 1970