Partulidae
Partula radiolata
The Partulidae, sometimes called tree snails, are a family of snails from the subordination of terrestrial snails ( gastropod ). Many species of the family are or were endemic to individual islands of the Pacific Ocean. A total of at least about 140 species are known. Many are endangered or already extinct.
Features
The housings are medium to large, low to hochkonisch, oval to slender. It can be right-or linksgewunden. The estuary margins are widened and folded back. Laminate plicae and are not present, but often presents the parietal wall, a short tooth on. The surface is smooth or spiral striped or ribbed. The sole is not divided into fields. In hermaphroditic genital apparatus of the penis is usually simple, without epiphallus, but a flagellum may be present. The apical or subapical Penisretraktor sits on the penis. The vas deferens arises just below the albumin gland, the prostate is generally small and round. The stem of the spermathecae is relatively long, the reservoir itself of various shapes.
Occurrence, lifestyle and dissemination
The distribution of the family is restricted to the Pacific. The species are mostly arboreal.
System
The Partulidae family is the family of the superfamily nominotypical Partuloidea Pilsbry, 1900, which still contains the Partulidae the monotypic family Draparnaudiidae.
- Partulidae Pilsbry, 1900 Genus Eua Pilsbry & Cooke, 1934 ( with the subgenera Eua Pilsbry & Cooke, 1934 Neanassa Pilsbry & Cooke, 1934, and Thakombaua Pilsbry, 1909)
- Genus Partula Ferussac, 1819 ( with the subgenera Partula Ferussac, 1819 Melanesica Pilsbry, 1909, Carolin Ella Pilsbry, 1909, Mary Ella Pilsbry, 1909, Leptopartula Pilsbry, 1909 and Palaopartula Pilsbry, 1909)
- Genus Rennellia Clench, 1941
- Genus Samoana Pilsbry, 1909 ( with the subgenera Samoana Pilsbry, 1909 and Marquesana Pilsbry, 1909)
Phylogeny
After the molecular genetic analysis of Wade et al. (2006 ) form the Partulidae the sister group to a larger group of snails families, all for Orthurethra - type include ( Cochlicopidae, Valloniidae, Vertiginidae, Orculidae etc.). However, the analysis is based on yet few taxa. Remarkably, the genus Draparnaudia in this diagram is not related to the sister group of the Partulidae, but close to the Gastrocoptinae. This of course raises questions about the correct position of the Draparnaudiidae on the Partuloidea.