Pachychilidae Temporal range: Paleogene - recent | |
---|---|
Two shells of Pachychilus laevissimus | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Gastropoda |
Subclass: | Caenogastropoda |
Superfamily: | Cerithioidea |
Family: | Pachychilidae P. Fischer & Crosse, 1892 [1] |
Type genus | |
Pachychilus I. Lea & H. C. Lea, 1851 | |
Diversity [2] [3] | |
191-226 extant species | |
Synonyms | |
Pachychilidae, common name pachychilids, is a taxonomic family of freshwater snails, gastropod molluscs in the clade Sorbeoconcha. [8]
Pachychilids are freshwater snails with a worldwide distribution in the tropics. Representatives are found in South and Central America, Africa, Madagascar, South and South-east Asia and tropical Australia (Queensland: Torres Strait Islands).
Pachychilids have an operculum, which is concentric and multispiral.
All species in the family inhabit freshwater except Faunus ater , which is a brackish water snail found in estuaries and other coastal habitats. Pachychilids are either oviparous (lay eggs), ovoviviparous or viviparous (retain developing eggs and youngs in special incubatory structures).
The name is derived from a combination of the words 'pachy' (Greek = thick) and the suffix '-chilus' (Greek = Lip), meaning 'thick lipped' - with respect to the thickened aperture of the shell in some species. Most 20th-century authors did not recognize Pachychilidae as an independent family, but affiliated species under different groups, such as Thiaridae and Pleuroceridae. However, recent revisions based on molecular and morphological evidence have proven their independent and distinct status from the former. This family has no subfamilies (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). [9]
Genera within the family Pachychilidae include:
A cladogram based on sequences of mitochondrial 16S ribosomal RNA sequences showing phylogenic relations of Pachychilidae: [12]
Pachychilidae | |||||||||||||||||||||||||
Madagasikara is a genus of tropical freshwater snails with an operculum, aquatic gastropod molluscs in the family Pachychilidae.
The Cerithioidea is a superfamily of marine, brackish water and freshwater gastropod containing more than 200 genera. The Cerithioidea are included unassigned in the subclass Caenogastropoda. The original name of this superfamily was Cerithiacea, in keeping with common superfamily endings at the time.
Batillariidae, common name batillariids or mudcreepers, are a family of marine, cerithioidean gastropod molluscs in thesuperfamily Cerithioidea.
Brotia is a genus of Southeast Asian freshwater snails, gastropod molluscs in the taxonomic family Pachychilidae.
Brotia citrina is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae.
Brotia pagodula is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae.
Brotia episcopalis is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae.
Brotia sumatrensis is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae. Previously frequently synonymized with Brotia costula, biological systematics was able to molecularly distinguish the two.
Jagora is a genus of freshwater snails which have an operculum, aquatic gastropod mollusks in the family Pachychilidae.
Sulcospira is a genus of freshwater snails which have an operculum, aquatic gastropod mollusks in the family Pachychilidae.
Tylomelania is a genus of freshwater snails which have an operculum, aquatic gastropod mollusks in the family Pachychilidae. In the aquarium hobby, snails from this genus are commonly known as "rabbit snails".
Tylomelania neritiformis is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae.
Tylomelania kruimeli is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae.
Tylomelania masapensis is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae.
Tylomelania towutica is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae.
Sermyla is a genus of brackish water and freshwater snails with an operculum, an aquatic gastropod mollusks in the subfamily Thiarinae of the family Thiaridae.
Brotia herculea, common name the giant tower cap snail, is a species of freshwater snail with an operculum, an aquatic gastropod mollusc in the family Pachychilidae.
Sulcospira tonkiniana is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae.
Brotia costula is a species of gastropod belonging to the family Pachychilidae.
Paracrostoma is a genus of Southeast Asian freshwater snails, gastropod molluscs in the taxonomic family Pachychilidae.