Pinnotheroidea De Haan, 1833

Tsang, Ling Ming & Naruse, Tohru, 2023, Recognition of Parapinnixidae Števčić, 2005, and Tetriasidae fam. nov. in Pinnotheroidea De Haan, 1833 (Crustacea: Brachyura: Thoracotremata), Zootaxa 5249 (5), pp. 540-558 : 550

Key to the families in Pinnotheroidea De Haan, 1833

1. Pereopod 2 or pereopods 2 and 3 distinctly larger, more inflated and longer than pereopods 4 and 5. G1 long, slender, markedly bent mesially at proximal one-third to quarter....................................... Parapinnixidae Števčić, 2005

- Pereopod 2 shorter than, and not more inflated than other pereopods. G1 slender to rather stout, variously curved but not markedly bent at proximal one-third to quarter.................................................................. 2

2. Mxp3 palp articles (carpus, propodus, dactylus) all large, each article is about two-thirds length of merus; dactylus always present, extending to base of ischiomerus when palp folded...................................... Tetriasidae fam. nov.

- Mxp3 palp articles (carpus, propodus, dactylus) may be developed but not always all large; dactylus present or absent, if present, extending at most to distal quarter of ischiomerus when palp folded.................. Pinnotheridae De Haan, 1833