Important Points to Remember of Phylum Mollusca
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Important Points to Remember of Phylum Mollusca
Classification of Animals Non Chordates of Class 11
- Tridaena derasa posseses largest molluscan shell.
- Ammonicera rota is smallest mollusc.
- Eupyrene are small thread-like motile sperms, which are capable of fertilising ova.
- Oligopyrene are large spindle-shaped, non-motile sperms, unable to fertilise ova.
- During larval development of gastropods, visceropallium rotates anticlockwise through 180° from its initial position. This is known as torsion.
- Umbo is the thickest & oldest part of shell of Unio.
- An organ which is used to transfer the sperms to the female body is known as intromittent organ.
- Architeuthis posseses largest eye.
- Octopus apollyon is the largest Octopus.
- Tethys is the largest snail.
- Architeuthis (giant squid) is largest invertebrate.
- Helix alpersa is slowest moving snail.
| Common Name | |
|---|---|
| Polyplacophora | |
| Chiton | Sea mica (Mail shell) |
| Scaphooda | |
| Dentalium | Tusk shell |
Gastropoda |
|
| Patella | Limpet |
| Fissurella | Key–hole limpet |
| Trochus | Top shell |
| Pila | Apple snail |
| Crepidula | Slipper shell |
| Cypraea | Cowrie |
| Natica | Star shell |
| Buccinum | Whelk |
| Doris | Sea lemon |
| Aplysia | Sea hare |
| Turbo | Cat’s eyes |
| Vermetes | Worm shell |
| Nassa | Mud shell |
| Conus | Cone shell |
| Bulla | Bubble shell |
| Helix | Land snail |
| Limax | Slug |
| Pteropod | Sea butterfly |
Pelecypoda |
|
| Mytilus | Sea mussel |
| Spondylus | Edible oyster |
| Pinctada | Pearl Oyster |
| Pecten | Scallop |
| Teredo | Shipworm |
| Solen | Rozor clam |
Cephalopoda |
|
| Sepia | Cuttle fish |
| Loligo | Squid (sea arrow) |
| Octopus | Devil fish |
| Spirula | Spiral shell |
| Architeuthis | Giant squid |
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