''Euthema'' is a
fossil genus of minute
land snail
A land snail is any of the numerous species of snail that live on land, as opposed to the sea snails and freshwater snails. ''Land snail'' is the common name for terrestrial gastropod mollusks that have shells (those without shells are known as ...
s with an
operculum,
terrestrial gastropod
The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda ().
This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...
mollusc
Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is esti ...
s in the family
Diplommatinidae from the
Cretaceous Burmese
Burmese may refer to:
* Something of, from, or related to Myanmar, a country in Southeast Asia
* Burmese people
* Burmese language
* Burmese alphabet
* Burmese cuisine
* Burmese culture
Animals
* Burmese cat
* Burmese chicken
* Burmese (hor ...
and
Hkamti ambers.
Species
As of 2021, 8 species are placed into ''Euthema'':
*''E. annae'' :
described from the
Cretaceous Burmese amber,
the species was first described in the paper published online by "
Cretaceous Research
''Cretaceous Research'' is a bimonthly peer-reviewed scientific journal published by Elsevier. The journal focuses on topics dealing with the Cretaceous period and the Cretaceous–Paleogene boundary.
Abstracting and indexing
The journal is abst ...
" on October 16th 2020, which qualifies as a nomenclatural act under Article 8.5 of the
ICZN
The International Code of Zoological Nomenclature (ICZN) is a widely accepted convention in zoology that rules the formal scientific naming of organisms treated as animals. It is also informally known as the ICZN Code, for its publisher, the I ...
when registered in
ZooBank, though the final version of the paper was published and printed in February 2021.
*''E. dilatata'' , originally described as ''Truncatellina dilatatus''
*''E. hesoana''
*''E. lophopleura'' , originally described in the new genus ''Xenostoma''
*''E. myanmarica'' - species from
Hkamti amber
Burmese amber, also known as Burmite or Kachin amber, is amber from the Hukawng Valley in northern Myanmar. The amber is dated to around 100 million years ago, during the latest Albian to earliest Cenomanian ages of the mid-Cretaceous period. The ...
*''E. naggsi'' , type species
*''E. spelomphalos'' , originally described in the new genus ''Paleodiplommatina''
*''E. truncatellina''
ZooBank - ''Euthema truncatellina''
/ref>
Etymology
''Euthema truncatellina'' is named after the extant genus ''Truncatellina
''Truncatellina'' is a genus of very small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Truncatellinidae.MolluscaBase (2018). Truncatellina R. T. Lowe, 1852. Accessed through: World Register of Marine Spec ...
'' (Stylommatophora
Stylommatophora is an orderPhilippe Bouchet, Jean-Pierre Rocroi, Bernhard Hausdorf, Andrzej Kaim, Yasunori Kano, Alexander Nützel, Pavel Parkhaev, Michael Schrödl and Ellen E. Strong. 2017. Revised Classification, Nomenclator and Typification ...
), which has a similar shell, acknowledging the convergence in the different lineages of gastropod
The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda ().
This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...
s on land.
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 tall and wide.
References
Links
MolluscaBase - ''Euthema''
{{Diplommatinidae-stub
Diplommatinidae
Burmese amber
Prehistoric gastropod genera