umbonal spine

umbonal spine
(ARTHROPODA: Crustacea)
In Conchostraca, a hollow, curved, looped or nodular spinose projection of variable size, sometimes covering the entire umbo.

Online Dictionary of Invertebrate Zoology. . 2005.

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  • umbonal spine — Hollow, minute to large spinose projection of conchostracan carapace that may involve entire umbo; may be curved, looped, or represented as node or nipple. (Larval condition characteristic in Vertexiidae.) [Moore and McCormick, 1969]. Hollow,… …   Crustacea glossary

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