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or swimming larval stage which hatches out of egg capsules, there are two parts to the protoconch. The first part of the protoconch (which is formed within the embryonic egg capsule) is called protoconch 1, while the part that is formed after the larva has hatched is called protoconch 2. There is
194:. The teleoconch starts forming when the larval gastropod becomes a juvenile, and the protoconch may dissolve. Quite often there is a visible line of demarcation where the protoconch ends and the teleoconch begins, and there may be a noticeable change in
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323:"Inflated Protoconchs and Internally Dissolved, Coiled Protoconchs of Nudibranch Larvae: Different Developmental Trajectories Achieve the Same Morphological Result"
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have an 'inflated' protoconch, which does not grow but houses the growing soft tissues of the larva, and this distinguishes them from other gastropods.
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often a different sculpture or ornamentation on protoconch 1 compared with protoconch 2, and this can be distinguished under the
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The structure of the protoconch has been widely used as a discriminating feature in gastropod
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183:. In older texts it is also called "nucleus". The protoconch may sometimes consist of several
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Detail of apical view of the same shell showing clearly visible protoconch, that has 2¼
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The whorls of the adult shell, which are formed after the protoconch, are known as the
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11 hours post fertilization, with calcified protoconch (pc) prior to
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Comparison of the whole shell and the protoconch of
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49:. Unsourced material may be challenged and removed.
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16:Embryonic or larval shell of some molluscs
109:Learn how and when to remove this message
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201:In some gastropod groups (such as the
171:shell which occurs in some classes of
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651:Flotation devices ("secondary fins")
47:adding citations to reliable sources
299:showing protoconch in bottom image.
943:) → Juvenile → Subadult → Adult •
175:, e.g., the initial chamber of an
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1329:Reproductive system of gastropods
1334:Respiratory system of gastropods
1249:Circulatory system of gastropods
687:Hepatopancreas (digestive gland)
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656:Funnel–mantle locking apparatus
272:Apical view of the whole shell.
34:needs additional citations for
1274:Excretory system of gastropods
1264:Digestive system of gastropods
843:Nuchal folds (occipital folds)
838:Nuchal crest (occipital crest)
1:
155:when the torsion is complete.
1339:Sensory organs of gastropods
1304:Nervous system of gastropods
949:Protoconch (embryonic shell)
1370:Circumesophageal nerve ring
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179:or the larval shell of a
212:In species which have a
228:. For example, certain
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243:(clams) is called the
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930:Developmental stages:
822:Spadix and antispadix
706:Nephridia ("kidneys")
321:Page, Louise (2000).
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281:
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327:Invertebrate Biology
43:improve this article
1294:Hypobranchial gland
1242:Internal soft parts
1166:External soft parts
917:Squid giant synapse
848:Occipital membrane
721:Pericardial glands
416:Argonautid eggcase
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1319:Oesophageal pouch
1178:Caudal mucous pit
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786:Suckers and hooks
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711:Nidamental glands
641:Dermal structures
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295:Growth series of
258:Atlanta lesueurii
203:Architectonicidae
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1309:Nidamental gland
1233:Suprapedal gland
1130:Other hard parts
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941:Doratopsis stage
912:Squid giant axon
831:Occipital region
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682:Ctenidia (gills)
677:Branchial hearts
670:Internal anatomy
634:External anatomy
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153:Haliotis asinina
136:Haliotis asinina
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853:Olfactory organ
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1406:Mollusc shells
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899:Chromatophores
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297:Caecum glabrum
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207:heterostrophic
151:Protoconch of
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795:Buccal region
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464:Spirula shell
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459:Gladius (pen)
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449:Cirrate shell
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245:prodissoconch
242:
239:structure in
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129:image of the
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99:November 2020
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63:
60: –
59:
55:
54:Find sources:
48:
44:
38:
37:
32:This article
30:
26:
21:
20:
1065:
1046:Periostracum
948:
929:
858:Nuchal organ
757:Hectocotylus
646:Fins (wings)
552:Body chamber
516:Periostracum
335:. Retrieved
330:
326:
316:
296:
256:
254:
234:
230:nudibranches
223:
211:
206:
200:
189:
160:
158:
152:
134:
105:
96:
86:
79:
72:
65:
58:"Protoconch"
53:
41:Please help
36:verification
33:
1375:Trochophore
1360:Pseudofeces
1314:Odontophore
1269:Diverticula
1213:Pneumostome
1056:Planispiral
945:Egg fossils
904:Photophores
867:Other parts
812:Odontophore
734:Head &
567:Phragmocone
337:20 November
226:systematics
131:trochophore
1324:Osphradium
1299:Nephridium
1218:Rhinophore
1208:Parapodium
1137:Clausilium
1076:Selenizone
1066:Protoconch
1016:Body whorl
879:Statocysts
716:Osphradium
454:Cuttlebone
380:Cephalopod
308:References
237:homologous
219:microscope
192:teleoconch
161:protoconch
69:newspapers
1355:Epiphragm
1259:Ctenidium
1147:Operculum
1142:Love dart
1106:Umbilicus
1071:Sculpture
1051:Peristome
1026:Columella
989:Gastropod
937:Paralarva
764:Tentacles
577:Siphuncle
536:Umbilicus
521:Sculpture
426:Orthocone
196:sculpture
181:gastropod
165:embryonic
1400:Category
1188:Cnidosac
1006:Aperture
802:Aptychus
774:Dactylus
545:Internal
496:Aperture
489:External
482:Features
437:Internal
404:External
251:Examples
241:bivalves
177:ammonite
173:molluscs
1385:Veliger
1365:Torsion
991:anatomy
892:General
692:Ink sac
557:Camerae
531:Sutures
382:anatomy
214:veliger
141:torsion
83:scholar
1228:Siphon
1198:Mentum
1193:Mantle
1183:Cerata
1157:Radula
1101:Suture
1021:Callus
817:Radula
769:Carpus
626:funnel
623:&
621:Mantle
582:Whorls
506:Callus
469:Stylet
284:whorls
185:whorls
169:larval
85:
78:
71:
64:
56:
1348:Other
1203:Notum
1152:Pearl
1121:Whorl
1116:Varix
1111:Valve
1091:Spire
1061:Plait
1041:Nacre
998:Shell
933:Spawn
779:Manus
737:limbs
572:Septa
562:Nacre
526:Spire
511:Lirae
397:Types
389:Shell
90:JSTOR
76:books
1254:Crop
1036:Lira
1011:Apex
874:Eyes
807:Beak
752:Arms
694:and
661:Tail
501:Apex
339:2020
235:The
62:news
1031:Lip
696:ink
333:(3)
331:119
221:.
209:.
167:or
133:of
127:SEM
125:An
45:by
1402::
947:•
935:→
329:.
325:.
261::
247:.
159:A
981:e
974:t
967:v
939:(
372:e
365:t
358:v
341:.
143:.
112:)
106:(
101:)
97:(
87:·
80:·
73:·
66:·
39:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
