Acorn-shell
(n.) One of the sessile cirripeds; a barnacle of the genus Balanus. See Barnacle. | ||||
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Acorn-shell definition was found in categories: Language, Idioms & Slang(1) Encyclopedia(1)
Acorn-shell Definition from Language, Idioms & Slang Dictionaries & Glossaries
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acorn-shell
acorn-shell
\a"corn-shell`\ (&?;), n. (zo?l.) one of the sessile cirripeds; a barnacle of the genus balanus. see barnacle.
acorn-shell
\a"corn-shell`\ (&?;), n. (zo?l.) one of the sessile cirripeds; a barnacle of the genus balanus. see barnacle.
Acorn-shell Definition from Encyclopedia Dictionaries & Glossaries
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Balanus
Balanus amphitrite is small about 1.5 cm diameter. The color is whitish with purple or brown longitudinal stripes. Surface of test plates are longitudinally ribbed. The interlocking tergum and scutum, the paired structures which cover the animal inside are as pictured below.
A similar species, Balanus reticulatus Utinomi, commonly occurs with B. amphitrite. It also has longitudinal purple or brown stripes, but these stripes are intersected by horizontal grooves, giving the surface of the test plates a rough reticulated striation, unlike B. amphitrite. It can also be distinguished by examination of the tergum and scutum. Note the more sharply pointed apex of the tergum and the elongated and narrower tergum spur of B. reticulatus.
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Barnacle
A barnacle is a type of arthropod belonging to infraclass Cirripedia in the subphylum Crustacea and is hence distantly related to crabs and lobsters. Some authorities regard Cirripedia as a full class or subclass, and the orders listed at right are sometimes treated as superorders. Around 1,220 barnacle species are currently known. The name "Cirripedia" is Latin, meaning "curl-footed".
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