Systellommatophora
| Systellommatophora | |
|---|---|
| File:Laevecaulis-2.jpg | |
| Land slug Laevicaulis alte (Veronicelloidea) | |
| File:Onchidella.jpg | |
| Sea slug Onchidella sp. (Onchidioidea) | |
| Scientific classification Edit this classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Superorder: | Eupulmonata |
| Order: | Systellommatophora |
| Families | |
|
See text | |
| Synonyms | |
|
Gymnomorpha | |
The Systellommatophora (synonym Gymnomorpha) is a clade of primitive, air-breathing slugs, according to the taxonomy of the Gastropoda (Bouchet & Rocroi, 2005).[1]
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),[2] whereas slugs in the superfamily Veronicelloidea are primarily terrestrial.
Anatomy
[edit | edit source]No species in this clade has a shell as an adult.[2][3] These slugs are distinguished by the location of the anus at the rear of the body.[4]
Although neither superfamily bears shells as adults,[3] the Onchidioidea do possess a vestigial, non-mineralized shell sac[5] and possess a larval shell.[6] It is not known whether or not the veronicellids bear a larval shell.[7]
Taxonomy
[edit | edit source]According to the previous taxonomy of the Gastropoda (Ponder & Lindberg, 1997) Systellommatophora was considered to be a suborder or an order.[8]
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
[edit | edit source]- ^ MolluscaBase eds. (2020). MolluscaBase. Stylommatophora. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=447 on 2020-05-02
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