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In many species of bivalves the beaks point towards one another. However, in some species of bivalves the beaks point posteriorly, in which case they are referred to as opisthogyrate; in others the beaks point forward, and are described as being prosogyrate.
57:, the highest and most prominent point on the valve. Because by definition, all bivalves have two valves, the shell of a bivalve has two umbones, and two beaks.
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If the beak is not eroded or worn down at all, it may still be capped with the
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of the adult animal. The beak usually, but not always, coincides with the
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26:(Lightfoot, 1786). In this species the beaks face one another across the
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85:Hatterlie, Eugene C.; Abbott, Donald P. (1980).
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91:Intertidal Invertebrates of California
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93:. Stanford University. p. 356.
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23:Cucullaea labiata
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286:Adductor muscles
253:Other hard parts
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368:Bivalve anatomy
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204:Periostracum
194:Pallial line
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342:Trochophore
337:Pseudofeces
169:Hinge teeth
373:Conchology
362:Categories
332:Glochidium
306:Nephridium
279:Soft parts
164:Hinge line
72:References
28:hinge line
291:Ctenidium
224:Sculpture
214:Resilifer
327:Abductin
270:Sea silk
219:Resilium
174:Ligament
347:Veliger
144:anatomy
142:Bivalve
47:mollusk
44:bivalve
311:Siphon
301:Mantle
260:Byssus
244:Annuli
184:Lunule
159:Callus
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320:Other
265:Pearl
234:Valve
229:Umbo
189:Nacre
151:Shell
51:valve
42:of a
40:shell
239:Beak
179:Lira
95:ISBN
55:umbo
36:beak
34:The
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134:e
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
