Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea) Author Ng, Peter K. L. Author Castro, Peter text Zootaxa 2016 4209 1 1 182 journal article 37321 10.11646/zootaxa.4209.1.1 2de5b7bf-3975-458a-b200-07ec69f4e013 1175-5326 272646 849BAB5C-464A-4B4A-A586-5742411EDC01 Key to subfamilies of Chasmocarcinidae 1. Antennule with peduncle not particularly enlarged although incapable of being folded into fossa (e.g., Fig. 21 A); dorsal anten- nular flagellum with elongated aesthetascs (e.g., Fig. 21 A). Carapace subtrapezoidal or subtriangular (e.g., Fig. 2 ); buccal cavern quadrate or rectangular (e.g., Figs. 21 B, 27A)........................................................... 2 - Antennule with greatly enlarged, swollen peduncle (e.g., Fig. 27 B); dorsal antennular flagellum with large, wide aesthetascs (e.g., Fig. 19 A‒C, G). Carapace quadrate or rectangular (e.g., Figs. 19 B, 20E); buccal cavern conspicuously arched, sunken (e.g., Figs. 27 C, 103D)..................................................................... Megaesthesiinae 2. Rounded or quadrate antennular peduncle ( Fig. 22 A); basal antennular article swollen so that antennular flagellum cannot fold into fossa ( Fig. 22 A). Vulva typically not conspicuously large, with thin margins (e.g., Figs. 89 B). Indirect development; marine................................................................................ Chasmocarcininae - Rectangular antennular peduncle ( Fig. 94 E, J); basal antennular article not swollen so that antennular flagellum can partially fold into fossa ( Fig. 94 E, J). Vulva conspicuously large, with thick margins (e.g., Fig. 99 D, F, H). Direct development (see Davie & Guinot 1996 : fig. 2). Freshwater, including inland caves.................................... Trogloplacinae