Order1-ONCHIDIACEA
1) They are slug-like, naked or without shell.
2) They have mantle which is projected widely beyond
the foot.
3) They have head with a pair retractile tentacles each
tipped with an eye.
4) Pulmonary sac ,anus and female gonopore located at
the posterior end.
5) They have male gonpore placed posteriorly.
Examples:-Onchidium, Onchidella.
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| Onchidella nigricans |
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| Onchidella celtica |
Order2-CEPHALASPIDEA
1) They generally have shell but may be partly or wholly
enclosed by mantle.
2) They may or maynot have Parapodial lobes.
3) They have head with tentacular shield.
Examples:-Acteon, Hydatina, Bulla  |
| Bulla peasiana |
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| Acteon tonatilis |
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| Hydatina |
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