Difference between revisions of "beak"
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|definition=1. Anything projecting and ending in a point. | |definition=1. Anything projecting and ending in a point. | ||
| − | 2. ([[Arthropoda]]) <i>a.</i> In Chelicerata, the gnathosome of acarines. <i>b.</i> In Crustacea, the anteroventral projection of the free margin of the carapace; not equivalent to rostrum. <i>c.</i> In [[Insecta]], the snout, proboscis, or rostrum; in Homoptera, usually 3-segmented, arising from the ventroposterior of the head and directed backward under the body. | + | 2. ([[Arthropoda]]) <i>a.</i> In [[Chelicerata]], the gnathosome of acarines. <i>b.</i> In [[Crustacea]], the [[anteroventral]] projection of the [[free margin]] of the [[carapace]]; not equivalent to [[rostrum]]. <i>c.</i> In [[Insecta]], the [[snout]], [[proboscis]], or [[rostrum]]; in Homoptera, usually 3-segmented, arising from the ventroposterior of the [[head]] and directed backward under the body. |
| − | 3. ([[Brachiopoda]]) The pedicel valve. | + | 3. ([[Brachiopoda]]) The [[pedicel]] valve. |
4. ([[Bryozoa]]) The avicularia. | 4. ([[Bryozoa]]) The avicularia. | ||
| − | 5. ([[Mollusca]]) <i>a.</i> An angular projection of the apex of an intermediate valve; a mucronate valve; a similar projection of the upper surface of the valve anteriorly and between the sutural laminae is termed a false beak. <i>b.</i> In [[Bivalvia]], noselike angle, along or above the hinge margin, marking the area of shell growth. <i>c.</i> In Cephalopoda, paired horny mandibles. | + | 5. ([[Mollusca]]) <i>a.</i> An angular projection of the [[apex]] of an [[intermediate valve]]; a [[mucronate valve]]; a similar projection of the upper surface of the valve anteriorly and between the [[sutural laminae]] is termed a false beak. <i>b.</i> In [[Bivalvia]], noselike angle, along or above the hinge margin, marking the [[area]] of [[shell]] [[growth]]. <i>c.</i> In [[Cephalopoda]], [[paired]] [[horny]] mandibles. |
| + | }} | ||
[[Category:Disambiguation page necessary]] | [[Category:Disambiguation page necessary]] | ||
| + | {{Concept scheme relation | ||
| + | |scheme=Dictionary of Invertebrate Zoology | ||
}} | }} | ||
Latest revision as of 23:39, 13 September 2013
beak (noun; Old French bec, beak): 1. Anything projecting and ending in a point.2. (Arthropoda) a. In Chelicerata, the gnathosome of acarines. b. In Crustacea, the anteroventral projection of the free margin of the carapace; not equivalent to rostrum. c. In Insecta, the snout, proboscis, or rostrum; in Homoptera, usually 3-segmented, arising from the ventroposterior of the head and directed backward under the body.
3. (Brachiopoda) The pedicel valve.
4. (Bryozoa) The avicularia.
5. (Mollusca) a. An angular projection of the apex of an intermediate valve; a mucronate valve; a similar projection of the upper surface of the valve anteriorly and between the sutural laminae is termed a false beak. b. In Bivalvia, noselike angle, along or above the hinge margin, marking the area of shell growth. c. In Cephalopoda, paired horny mandibles.
