movable spine
Spine set in socket; depressible, by movement towards basal structure such as carapace or segment of appendage [Butler, T.H.].

Crustacea glossary. . 2011.

Look at other dictionaries:

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  • spur — n. [A.S. spora, spur] 1. A movable spine like process. 2. (ARTHROPODA: Crustacea) a. In Cirripedia, a pendent like projection from the basal margin of the tergum. b. In Ostracoda, a flattened spine like projection in some dimorphic genera …   Dictionary of invertebrate zoology

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  • surgeonfish — noun Date: 1871 any of a family (Acanthuridae) of tropical bony fishes that have a laterally compressed body and typically a movable spine on each side of the body near the base of the tail capable of inflicting a painful wound …   New Collegiate Dictionary

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  • order Pediculati — noun anglers and batfishes; spiny finned marine fishes having pectoral fins at the ends of armlike processes and a long movable spine on the dorsal fin to lure prey to the large mouth • Syn: ↑Pediculati • Hypernyms: ↑animal order • Member… …   Useful english dictionary

  • fish — fishless, adj. /fish/, n., pl. (esp. collectively) fish, (esp. referring to two or more kinds or species) fishes, v. n. 1. any of various cold blooded, aquatic vertebrates, having gills, commonly fins, and typically an elongated body covered with …   Universalium

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