Tylomelania Helmuti
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''Tylomelania helmuti'' is a species of
freshwater snail Freshwater snails are gastropod mollusks which live in fresh water. There are many different families. They are found throughout the world in various habitats, ranging from ephemeral pools to the largest lakes, and from small seeps and springs ...
with an operculum, an aquatic
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 ...
mollusk in the family Pachychilidae. The
specific name Specific name may refer to: * in Database management systems, a system-assigned name that is unique within a particular database In taxonomy, either of these two meanings, each with its own set of rules: * Specific name (botany), the two-part (bino ...
''helmuti'' is in honor of Helmut Glaubrecht, father of the second author and supporter of the malacological research."Glaubrecht, Curriculum Vitae, Persönliche Daten"
.accessed 6 July 2014.


Distribution

This species occurs in the Lake Towuti drainage, in
Sulawesi Sulawesi (), also known as Celebes (), is an island in Indonesia. One of the four Greater Sunda Islands, and the world's eleventh-largest island, it is situated east of Borneo, west of the Maluku Islands, and south of Mindanao and the Sulu Ar ...
, Indonesia. The type locality is the stream-crossing on the road from Wawondula to Timampu.


Description

The shell has always some whorls corroded with 3-8
whorls A whorl ( or ) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs). Whorls in nature File:Photograph and axial plane floral d ...
. The width of the shell is up to 8.0–16.3 mm. The height of the shell is up to 15.8–34.6 mm. The width of the aperture is 4.0–8.5 mm. The height of the aperture is 6.2–13.2 mm.


Ecology

This species lives in shallow streams and marshes.


References

helmuti Gastropods described in 2003 {{Pachychilidae-stub