64:
17:
494:
50:
39:
215:
120:. The umbo forms while the animal is a juvenile, and radial growth subsequently proceeds around that area. The umbo is situated above the
262:
535:
27:
164:
128:, the umbones can nonetheless usually be readily identified by examining the concentric growth lines of the shell.
255:
223:
528:
415:
554:
248:
22:
559:
190:"Advanced glossary of molluscan terms | The Conchological Society of Great Britain and Ireland"
521:
112:, the oldest point of the valve, and its degree of prominence and position relative to the
124:. In those bivalves where the umbones do not protrude, as is the case for example in some
8:
420:
353:
509:
303:
189:
16:
373:
55:
440:
430:
313:
288:
31:
363:
90:
505:
425:
368:
308:
144:
109:
548:
338:
328:
280:
94:
63:
333:
323:
67:
Diagram of a bivalve shell viewed from the dorsal side: 1:Plane of symmetry
471:
466:
298:
493:
461:
435:
293:
132:
121:
113:
102:
49:
343:
89:) is the vaguely defined, often most prominent, highest part of each
43:
38:
456:
399:
348:
271:
98:
240:
501:
476:
105:
389:
125:
394:
318:
117:
59:(Lightfoot, 1786), the umbones are at the top of the image
196:. The Conchological Society of Great Britain and Ireland
42:
Diagram of the left valve of a bivalve resembling a
546:
131:Umbo is also in use in anatomic descriptions of
116:are sometimes helpful in distinguishing bivalve
34:on the right, next to the forward facing umbo.
529:
256:
536:
522:
263:
249:
135:, for the origin of growth of the valves.
30:aspect in order to show the brown-tinted
62:
48:
37:
15:
547:
244:
488:
270:
13:
108:. It usually contains the valve's
14:
571:
162:
492:
53:A side view of a whole shell of
208:
182:
156:
1:
150:
508:. You can help Knowledge by
7:
138:
20:A left valve of a juvenile
10:
576:
487:
449:
408:
382:
279:
23:Mercenaria campechiensis
504:-related article is a
170:. University of Oregon
74:
60:
46:
35:
220:www.manandmollusc.net
66:
52:
41:
19:
165:"Mollusca: Bivalva"
75:
61:
47:
36:
517:
516:
485:
484:
56:Cucullaea labiata
567:
538:
531:
524:
496:
489:
416:Adductor muscles
383:Other hard parts
265:
258:
251:
242:
241:
236:
235:
233:
231:
222:. Archived from
212:
206:
205:
203:
201:
194:www.conchsoc.org
186:
180:
179:
177:
175:
169:
163:Brink, Laura A.
160:
26:viewed from the
575:
574:
570:
569:
568:
566:
565:
564:
555:Bivalve anatomy
545:
544:
543:
542:
486:
481:
445:
404:
378:
275:
269:
239:
229:
227:
214:
213:
209:
199:
197:
188:
187:
183:
173:
171:
167:
161:
157:
153:
141:
72:
70:
68:
12:
11:
5:
573:
563:
562:
557:
541:
540:
533:
526:
518:
515:
514:
497:
483:
482:
480:
479:
474:
469:
464:
459:
453:
451:
447:
446:
444:
443:
438:
433:
428:
426:Gastric shield
423:
418:
412:
410:
406:
405:
403:
402:
397:
392:
386:
384:
380:
379:
377:
376:
371:
366:
361:
356:
351:
346:
341:
336:
331:
326:
321:
316:
311:
306:
301:
296:
291:
285:
283:
277:
276:
268:
267:
260:
253:
245:
238:
237:
207:
181:
154:
152:
149:
148:
147:
145:Beak (bivalve)
140:
137:
69:2:Growth lines
9:
6:
4:
3:
2:
572:
561:
560:Bivalve stubs
558:
556:
553:
552:
550:
539:
534:
532:
527:
525:
520:
519:
513:
511:
507:
503:
498:
495:
491:
490:
478:
475:
473:
470:
468:
465:
463:
460:
458:
455:
454:
452:
448:
442:
439:
437:
434:
432:
429:
427:
424:
422:
419:
417:
414:
413:
411:
407:
401:
398:
396:
393:
391:
388:
387:
385:
381:
375:
372:
370:
367:
365:
362:
360:
357:
355:
352:
350:
347:
345:
342:
340:
339:Prodissoconch
337:
335:
332:
330:
329:Pallial sinus
327:
325:
322:
320:
317:
315:
312:
310:
307:
305:
302:
300:
297:
295:
292:
290:
287:
286:
284:
282:
278:
273:
266:
261:
259:
254:
252:
247:
246:
243:
226:on 5 May 2012
225:
221:
217:
211:
195:
191:
185:
166:
159:
155:
146:
143:
142:
136:
134:
129:
127:
123:
119:
115:
111:
107:
104:
100:
96:
92:
88:
84:
80:
65:
58:
57:
51:
45:
40:
33:
29:
25:
24:
18:
510:expanding it
499:
358:
334:Periostracum
324:Pallial line
228:. Retrieved
224:the original
219:
210:
198:. Retrieved
193:
184:
172:. Retrieved
158:
130:
86:
82:
78:
76:
54:
21:
472:Trochophore
467:Pseudofeces
299:Hinge teeth
133:brachiopods
549:Categories
462:Glochidium
436:Nephridium
409:Soft parts
294:Hinge line
216:"Bivalves"
151:References
122:hinge line
114:hinge line
71:3:Ligament
421:Ctenidium
354:Sculpture
344:Resilifer
457:Abductin
400:Sea silk
349:Resilium
304:Ligament
139:See also
103:univalve
81:(plural
502:bivalve
477:Veliger
274:anatomy
272:Bivalve
126:mussels
106:mollusc
99:bivalve
93:of the
83:umbones
44:venerid
441:Siphon
431:Mantle
390:Byssus
374:Annuli
314:Lunule
289:Callus
230:27 May
200:27 May
174:27 May
73:4:Umbo
32:lunule
28:dorsal
500:This
450:Other
395:Pearl
364:Valve
359:Umbo
319:Nacre
281:Shell
168:(PDF)
97:of a
95:shell
91:valve
87:umbos
506:stub
369:Beak
309:Lira
232:2017
202:2017
176:2017
118:taxa
110:beak
79:umbo
77:The
101:or
85:or
551::
218:.
192:.
537:e
530:t
523:v
512:.
264:e
257:t
250:v
234:.
204:.
178:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
