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, minute to large, curved, looped, or nodular spinose projection, sometimes involving entire umbo [McLaughlin, 1980].

Crustacea glossary. . 2011.

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  • umbonal spine — (ARTHROPODA: Crustacea) In Conchostraca, a hollow, curved, looped or nodular spinose projection of variable size, sometimes covering the entire umbo …   Dictionary of invertebrate zoology

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