The Echinoid Directory

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Key to genera of Urechinidae

1a. Two discrete anterior genital plates. Go to 2	1b. Single anterior genital plate. Cystechinus
2a. Periproct marginal (arrowed) ; four gonopores; females with modified brood pouch. Antrechinus	2b. Periproct inframarginal (arrowed); three gonopores; no sexual dimorphism. Urechinus