The Echinoid Directory

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Key to the families of Stomopneustoida 1a. Primary tubercles obviously crenulate. Glyptocidaridae 1b. Primary tubercles non-crenulate go to 2 2a. Ambulacral plate compounding in triads and diadematid or arbaciid in style. Stomechinidae 2b. Ambulacral plate compounding polygeminate and stomopneustid in style. Stomopneustidae