Systellommatophora
| Systellommatophora | |
|---|---|
| File:Laevecaulis-2.jpg | |
| Land slug Laevicaulis alte (Veronicelloidea) | |
| File:Onchidella.jpg | |
| Sea slug Onchidella sp. (Onchidioidea) | |
| Scientific classification | |
| Kingdom: | |
| Phylum: | |
| Class: | |
| (unranked): | |
| Families | |
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See text |
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| Synonyms | |
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Gymnomorpha |
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The Systellommatophora (synonym Gymnomorpha) is a clade of primitive, air-breathing slugs, according to the taxonomy of the Gastropoda (Bouchet & Rocroi, 2005). They are marine and terrestrial pulmonate gastropods within the Heterobranchia. There are two superfamilies in this clade. Slugs in the superfamily Onchidioidea are primarily marine (except for five land-dwelling or freshwater species),[1] whereas slugs in the superfamily Veronicelloidea are primarily terrestrial.
Anatomy
No species in this clade have shells as adults.[1][2] These slugs are distinguished by the location of the anus at the rear of the body.[3]
Although neither superfamily bears shells as adults,[2] the Onchidioidea do possess a vestigial, non-mineralized shell sac[4] and possess a larval shell.[5] It is not known whether or not the veronicellids bear a larval shell.[6]
Taxonomy
According to the previous taxonomy of the Gastropoda (Ponder & Lindberg, 1997) Systellommatophora was considered to be a suborder or an order.[7]
The following two superfamilies and families have been recognized in the taxonomy of Bouchet & Rocroi (2005):
- superfamily Onchidioidea Rafinesque, 1815
- Onchidiidae Rafinesque, 1815
- Superfamily Veronicelloidea Gray, 1840
- Veronicellidae Gray, 1840
- Rathouisiidae Heude, 1885
References
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