anal spine
a spine at the origin of the anal fin before the soft rays. In flatfishes this is not a true spine but the free end of the first distal anal pterygiophore under the skin which may protrude through the skin

Dictionary of ichthyology. 2009.

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  • anal spine(s) — Single row of spines on either side of cladoceran postabdomen (e.g., Sididae, Holopedidae, Daphniidae). (In addition, some cladocerans possess lateral spines (e.g., Macrothricidae, Chydoridae).) [Moore and McCormick, 1969]. Single row of spines… …   Crustacea glossary

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