Acteonoidea: Difference between revisions
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| superfamilia_authority = [[Alcide d'Orbigny|d'Orbigny]], 1843 |
| superfamilia_authority = [[Alcide d'Orbigny|d'Orbigny]], 1843 |
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| subdivision_ranks = Families |
| subdivision_ranks = Families |
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| subdivision = |
| subdivision = See text. |
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*[[Acteonidae]] |
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*[[Bullinidae]] |
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*[[Aplustridae]] |
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}} |
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The [[superfamily]] of [[headshield]] [[slug]]s of the '''Acteonoidea''' belongs to the suborder [[Cephalaspidea]] and the [[Opisthobranchia]]. |
The [[superfamily]] of [[headshield]] [[slug]]s of the '''Acteonoidea''' belongs to the suborder [[Cephalaspidea]] and the [[Opisthobranchia]]. |
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They are considered very primitive opisthobranchs. The shell of these [[micromollusk]]s is gradually reduced in consecutive order from Acteonidae, to Bullidae, to Hydatinidae. They all have first an external penis; afterwards they develop the female part (a process called '''protrandry'''). They are distinguished from other [[Opisthobranchia|opisthobranchs]], by having a headshield, lack of tentacles and broad parapodia (mantle flaps), which fold along the side of the shell as the mollusk crawls on a sandy bottom. They are |
They are considered very primitive opisthobranchs. The shell of these [[micromollusk]]s is gradually reduced in consecutive order from Acteonidae, to Bullidae, to Hydatinidae. They all have first an external penis; afterwards they develop the female part (a process called '''protrandry'''). They are distinguished from other [[Opisthobranchia|opisthobranchs]], by having a headshield, lack of tentacles and broad parapodia (mantle flaps), which fold along the side of the shell as the mollusk crawls on a sandy bottom. They are [[carnivore]]s, preying on [[polychaete worm]]s. |
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==Families in the superfamily Acteonoidea== |
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== Taxonomy == |
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Superfamily Acteonoidea |
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*family |
* family [[Bullinidae]] <small>Gray, 1850 </small> |
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*family |
* family [[Aplustridae]] <small>Gray, 1847 </small> (former name Hydatinidae has been declared invalid) |
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*family |
*† family [[Acteonellidae]] <small>Gill, 1871 </small> |
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*† family |
*† family [[Zardinellidae]] <small>Bandel, 1994 </small> |
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| ⚫ | |||
==See also== |
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* [[Cephalaspidea]] |
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[[Category:Gastropods]] |
[[Category:Gastropods]] |
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Revision as of 15:10, 22 December 2007
| Acteonoidea | |
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| Superfamily: | Acteonoidea d'Orbigny, 1843
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| Families | |
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See text. | |
The superfamily of headshield slugs of the Acteonoidea belongs to the suborder Cephalaspidea and the Opisthobranchia.
They are considered very primitive opisthobranchs. The shell of these micromollusks is gradually reduced in consecutive order from Acteonidae, to Bullidae, to Hydatinidae. They all have first an external penis; afterwards they develop the female part (a process called protrandry). They are distinguished from other opisthobranchs, by having a headshield, lack of tentacles and broad parapodia (mantle flaps), which fold along the side of the shell as the mollusk crawls on a sandy bottom. They are carnivores, preying on polychaete worms.
Families in the superfamily Acteonoidea
- family Acteonidae d' Orbigny, 1843
- family Bullinidae Gray, 1850
- family Aplustridae Gray, 1847 (former name Hydatinidae has been declared invalid)
- † family Acteonellidae Gill, 1871
- † family Zardinellidae Bandel, 1994