Table 2

Diagnotic features listed by Taylor (1966a) for hydrobiid subfamilies found in Cuatro Ciénegas

Subfamily Diagnostic features
Cochliopinae Shell trochoid to planispiral
Littoridininae Shell elongate to turriform; penis with bulbous or elongate lobes
Nymphphilinae Shell large, trochoid, with operculum multispiral; penis with elongate filament and blood sinus; vas deferens in elevated ridge along mantle cavity floo
Mexithaumatinae Shell with britsly periostracum; anterior end of pallial oviduct reflected; mantle edge papillate; tentacles with pigment strip along length
Paludiscalinae Shell with lamelliform costae

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