View source for Euthema

{{Short description|Extinct genus of gastropods}}
{{Automatic taxobox
| taxon = Euthema
| fossil_range =<br/>[[Albian]]-early [[Cenomanian]]<br/>{{fossilrange|110|99}}
| image = Euthema hesoana holotype Fig4.jpg
| image_caption = Holotype specimen of ''Euthema hesoana''
| authority = Yu, Wang & Pan, 2018<ref name="Yu">{{cite journal |last1=Yu |first1=T. |last2=Wang |first2=B. |last3=Pan |first3=H. |year=2018 |title=New terrestrial gastropods from mid-Cretaceous Burmese amber |journal=Cretaceous Research |volume=90 |pages=254–258|doi=10.1016/j.cretres.2018.04.015 }}</ref>
| subdivision_ranks = Species
| subdivision = ''See text''
| synonyms = * ''Paleodiplommatina'' {{small|Bullis et al., 2020}}
* ''Xenostoma'' {{small|Bullis et al., 2020}}
| display_parents = 3
}}
'''''Euthema''''' is a [[fossil]] [[genus]] of minute [[land snail]]s with an [[operculum (gastropod)|operculum]], [[Terrestrial molluscs|terrestrial]] [[gastropod]] [[mollusc]]s in the family [[Diplommatinidae]] from the [[Cretaceous]] [[Burmese amber|Burmese]] and [[Hkamti amber|Hkamti]] ambers.
==Species==
As of 2021, 8 species are placed into ''Euthema'':<ref name="Balashov21">{{Cite journal|last1=Balashov|first1=Igor|date=March 2021|title=The first records of mollusks from mid-Cretaceous Hkamti amber (Myanmar), with the description of a land snail, ''Euthema myanmarica'' n. sp. (Caenogastropoda, Cyclophoroidea, Diplommatinidae)|journal=[[Journal of Paleontology]]|volume=95 |issue=5 |pages=994–1003|doi=10.1017/jpa.2021.26}}</ref>
*''E. annae'' {{small|Balashov, 2020}}:<ref name="Balashov20">{{Cite journal |last=Balashov |first=I. |year=2020 |title=An inventory of molluscs recorded from mid-Cretaceous Burmese amber, with the description of a land snail, ''Euthema annae'' sp. nov. (Caenogastropoda, Cyclophoroidea, Diplommatinidae) |journal=[[Cretaceous Research]] |volume=118 |pages=Article 104676 |doi=10.1016/j.cretres.2020.104676 }}</ref><ref name="MolluscaBase - Euthema annae">[http://www.molluscabase.org/aphia.php?p=taxdetails&id=1463058 MolluscaBase - ''Euthema annae'']</ref> described from the [[Cretaceous]] [[Burmese amber]],<ref name="Balashov20"/><ref name="Balashov21"/><ref name="MolluscaBase - Euthema annae"/> the species was first described in the paper published online by "[[Cretaceous Research]]" on October 16, 2020, which qualifies as a nomenclatural act under Article 8.5 of the [[ICZN]] when registered in [[ZooBank]],<ref>[https://www.iczn.org/the-code/the-international-code-of-zoological-nomenclature/the-code-online/ ICZN - The Code Online]</ref> though the final version of the paper was published and printed in February 2021.
*''E. dilatata'' {{small|(Yu, 2020)}}, originally described as ''Truncatellina dilatatus''<ref name="Balashov21"/>
*''E. hesoana'' {{small|Asato & Hirano in Hirano et al., 2019}}
*''E. lophopleura'' {{small|(Bullis, Herhold, Czekanski-Moir, Grimaldi & Rundell, 2020)}}, originally described in the new genus ''Xenostoma''<ref name="Balashov21"/>
*''E. myanmarica'' {{small|Balashov, 2021}} - species from [[Hkamti amber]]<ref name="Balashov21"/><ref>[http://zoobank.org/NomenclaturalActs/a1b26f35-aa40-44b7-ab84-2c12de02ce74 ZooBank - ''Euthema myanmarica'']</ref>
*''E. naggsi'' {{small|Yu, Wang & Pan, 2018}}, type species
*''E. spelomphalos'' {{small|(Bullis, Herhold, Czekanski-Moir, Grimaldi & Rundell, 2020)}}, originally described in the new genus ''Paleodiplommatina''<ref name="Balashov21"/>
*''E. truncatellina'' {{small|Balashov, Perkovsky & Vasilenko, 2020}}<ref>{{Cite journal|last1=Balashov|first1=I.|last2=Perkovsky|first2=E.|last3=Vasilenko|first3=D.|year=2020 |title=A mid-Cretaceous land snail ''Euthema truncatellina'' sp. nov. (Caenogastropoda, Cyclophoroidea, Diplommatinidae) from Burmese amber |journal=[[Zootaxa]]|volume= 4858|issue=2|pages=295–300 |doi=10.11646/zootaxa.4858.2.11|pmid=33056238}}</ref><ref>[http://www.molluscabase.org/aphia.php?p=taxdetails&id=1460828 MolluscaBase - ''Euthema truncatellina'']</ref><ref>[http://zoobank.org/NomenclaturalActs/ba61c2bb-3477-4773-ab70-775c66eccae1 ZooBank - ''Euthema truncatellina'']</ref>
==Etymology==
''Euthema truncatellina'' is named after the extant genus ''[[Truncatellina]]'' ([[Stylommatophora]]), which has a similar shell, acknowledging the [[Convergent evolution|convergence]] in the different lineages of [[gastropod]]s on land.<ref name="Balashov20"/>
==Description==
''Euthema annae'' has a shell which is almost cylindrical with 6 weakly convex whorls, ribbed, with strong constriction. Aperture almost heart-shaped with parietal inclusion. Umbilicus narrow. Periumbilical keel weak. Height of shell {{convert|2|mm|in|abbr=on}} tall and {{convert|1-1.1|mm|in|abbr=on}} wide.<ref name="Balashov20"/><ref name="Balashov21"/>
''E. myanmarica'' has a shell which is almost cylindrical, comprising 6 moderately convex whorls, ribbed, with weak constriction. The aperture is oval and the umbilicus wide, with a strong periumbilical keel. The shells are {{convert|2|mm|in|abbr=on}} and {{convert|0.9|mm|in|abbr=on}} wide.<ref name="Balashov21"/>
''E. truncatellina'' has a shell which is almost cylindrical, comprising 6.5 moderately convex whorls, ribbed, with weak constriction. The aperture is circular, the umbilicus narrow, and the periumbilical keel is absent. The shells are {{convert|1.7|mm|in|abbr=on}} and {{convert|0.9|mm|in|abbr=on}} wide.<ref name="Balashov20"/><ref name="Balashov21"/>
==References==
{{Reflist}}
==Links==
*[http://www.molluscabase.org/aphia.php?p=taxdetails&id=1320402 MolluscaBase - ''Euthema'']
{{Taxonbar|from1=Q100707322|from2=Q100707319|from3=Q106448051|from4=Q104860118}}
[[Category:Diplommatinidae]]
[[Category:Burmese amber]]
[[Category:Prehistoric gastropod genera]]
{{Diplommatinidae-stub}}