A new species of Ectinosoma Boeck, 1865 (Copepoda: Harpacticoida: Ectinosomatidae) from northwestern Mexico

摘要

A new species of harpacticoid copepod, Ectinosoma mexicanum (Harpacticoida: Ectinosomatidae), is described from a coastal lagoon in northwestern Mexico (Sinaloa state). Ectinosoma mexicanum appears to be allied to E. porosum (Wells, 1967) by sharing a robust endopod on P2 and P4 and a strong setae on the first and second endopodal segment of P2 and P4. The new Mexican ectinosomatid also has the seta next to the outermost seta of exopod of P5 barely longer than the exopod inner edge as in E. porosum and E. mediterraneum Kunz, 1975.