Semi-slug: Difference between revisions
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{{short description|Land gastropod}} |
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[[File:Cryptella canariensis.jpg|thumb|Drawing of two views of ''[[Cryptella canariensis]]'' from the [[List of non-marine molluscs of the Canary Islands|Canary Islands]]]] |
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[[File: |
[[File:Cryptella canariensis.jpg|thumb|Side and top view of a ''[[Cryptella canariensis]]'' from the [[List of non-marine molluscs of the Canary Islands|Canary Islands]]]] |
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[[File:Cryptella_canariensis_01.JPG|thumb|Shell of ''[[Cryptella canariensis]]'' ]] |
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[[File:Gastropod from Uganda.jpg|thumb|An unidentified semi-slug from [[List of non-marine molluscs of Uganda|Uganda]]]] |
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'''Semi-slugs''', also spelled '''semislugs''', are land [[gastropod]]s whose [[gastropod shell|shells]] |
'''Semi-slugs''', also spelled '''semislugs''', are land [[gastropod]]s whose [[gastropod shell|shells]] are too small for them to retract into, but not quite [[Vestigiality|vestigial]].<ref name="Burton 1982"/> The shell of some semi-slugs may not be easily visible on casual inspection, because the shell may be covered over with the [[Mantle (mollusc)|mantle]]. |
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This is a type of gastropod that is intermediate between a [[slug]] (without an external shell) and a [[land snail]] (with a large shell). |
This is a type of gastropod that is intermediate between a [[slug]] (without an external shell) and a [[land snail]] (with a large enough shell to retract completely into). |
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There exist a number of gastropod families that have semi- |
There exist a number of gastropod families that have semi-slug species.<ref name="Breure 2010">Breure A. S. H. (2010). "The rediscovery of a semi-slug: ''Coloniconcha prima'' Pilsbry, 1933 (Gastropoda, Pleurodontidae) from Hispaniola". ''[[Basteria]]'' '''74'''(4-6): 78-86.</ref> There exist about 1,000 species of semi-slugs in comparison to about only 500 species of slugs.<ref name="Burton 1982">Burton D. W. (1982). "How to be sluggish". ''[[Tuatara (journal)|Tuatara]]'' '''25'''(2): 48-63. [https://nzetc.victoria.ac.nz/tm/scholarly/tei-Bio25Tuat02-t1-body-d2.html HTM].</ref> |
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== Examples == |
== Examples == |
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Semi-slugs have a worldwide distribution and have evolved in several families; genera include: |
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* [[Palearctic realm|Palearctic]] and [[Nearctic realm|Nearctic]] |
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** family [[Parmacellidae]]: ''[[Cryptella]]'' |
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** family [[Vitrinidae]]: ''[[Eucobresia]], [[Semilimax]], [[Vitrina]], [[Vitrinobrachium]]''<ref>{{Cite journal |last1=Giusti |first1=F. |last2=Fiorentino |first2=V. |last3=Benocci |first3=A. |last4=Manganelli |first4=G. |date=2011 |title=A Survey of Vitrinid Land Snails (Gastropoda: Pulmonata: Limacoidea) |url=https://www.researchgate.net/publication/275555755 |journal=Malacologia |language=en |volume=53 |issue=2 |pages=279–363 |doi=10.4002/040.053.0206 |s2cid=86724021 |issn=0076-2997}}</ref> |
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* Asia - Pacific |
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** family [[Ariophantidae]]: ''[[Parmarion]]'', ''[[Ratnadvipia]], [[Varadia amboliensis|Varadia]]'' |
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** family [[Helicarionidae]]: ''[[Attenborougharion rubicundus|Attenborougharion]]'', ''[[Helicarion]]'', ''[[Howearion]]'', ''[[Ibycus (gastropod)|Ibycus]]'', ''[[Parmellops]]'', ''[[Ubiquitarion iridis|Ubiquitarion]]'' |
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* [[Tropical Africa]] |
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** family [[Urocyclidae]]: ''[[Gymnarion]]'' {{citation needed|date=January 2024}} |
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==See also== |
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* "Leatherleaf slugs" - [[Veronicellidae]] |
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== References == |
== References == |
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{{reflist}} |
{{reflist}} |
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[[Category: |
[[Category:Gastropod anatomy]] |
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Latest revision as of 00:12, 3 November 2024
Semi-slugs, also spelled semislugs, are land gastropods whose shells are too small for them to retract into, but not quite vestigial.[1] The shell of some semi-slugs may not be easily visible on casual inspection, because the shell may be covered over with the mantle.
This is a type of gastropod that is intermediate between a slug (without an external shell) and a land snail (with a large enough shell to retract completely into).
There exist a number of gastropod families that have semi-slug species.[2] There exist about 1,000 species of semi-slugs in comparison to about only 500 species of slugs.[1]
Examples
[edit]Semi-slugs have a worldwide distribution and have evolved in several families; genera include:
- Palearctic and Nearctic
- family Parmacellidae: Cryptella
- family Vitrinidae: Eucobresia, Semilimax, Vitrina, Vitrinobrachium[3]
- Asia - Pacific
- family Ariophantidae: Parmarion, Ratnadvipia, Varadia
- family Helicarionidae: Attenborougharion, Helicarion, Howearion, Ibycus, Parmellops, Ubiquitarion
- Semi-slugs also exist but are exceptional in the Camaenidae.[2]
- Neotropics
- family Amphibulimidae: Amphibulima, Gaeotis[2]
- family Xanthonychidae: Cryptostrakon, Semiconchula, Xanthonyx[2]
- family Pleurodontidae: Coloniconcha prima[2]
- Tropical Africa
- family Urocyclidae: Gymnarion [citation needed]
See also
[edit]- "Leatherleaf slugs" - Veronicellidae
References
[edit]- ^ a b Burton D. W. (1982). "How to be sluggish". Tuatara 25(2): 48-63. HTM.
- ^ a b c d e Breure A. S. H. (2010). "The rediscovery of a semi-slug: Coloniconcha prima Pilsbry, 1933 (Gastropoda, Pleurodontidae) from Hispaniola". Basteria 74(4-6): 78-86.
- ^ Giusti, F.; Fiorentino, V.; Benocci, A.; Manganelli, G. (2011). "A Survey of Vitrinid Land Snails (Gastropoda: Pulmonata: Limacoidea)". Malacologia. 53 (2): 279–363. doi:10.4002/040.053.0206. ISSN 0076-2997. S2CID 86724021.