Drymaeus henseli
Encyclopedia
Anthinus henselii is a species of air-breathing land snail, a terrestrial gastropod mollusk in the family Strophocheilidae
.
This species is also known as Drymaeus henselii and then it is placed in the subfamily Bulimulinae, family Orthalicidae
.
This species was originally described by Eduard von Martens
as Bulimulus henselii in 1868. The specific name is in honor of the German naturalist, paleontologist and zoologist Reinhold Hensel (1826–1881), who collected the first two specimens from which the species was described.
The type locality is Costa da Serra in the state Rio Grande do Sul
, which is the southernmost State of Brazil. This species is endemic to Brazil.
This species is accidentally listed twice in the Checklist of Rio Grande do Sul State (2009): as Drymaeus henselii (Martens, 1868) (subfamily Bulimulinae, family Orthalicidae) and as Gonyostomus henselii (Martens, 1868) in family Strophocheilidae. This species also inhabits Santa Catarina
in Brazil (listed as Drymaeus henselii (Martens, 1868)).
is perforate, ovate-turrited, irregularly striate and sculptured with very delicate, very close spiral lines. The color of the shell is whitish, painted with brown streaks, which are confluent in the middle of each whorl. The apex
is obtuse, brownish. The shell has 6 whorls
, that are rather flattened. The suture is irregularly undulating. The last whorl
is little convex below.
The aperture
is subvertical, ovate-oblong, nearly half the length of the shell. The peristome is a little thickened, lightly spreading and white. The columellar margin is dilated, not closing the perforation, expanded above in a parietal lamina. Columella itself is twisted.
The length of the shell is 40 mm. The width of the shell is 28 mm. The height of the aperture is 20 mm. The width of the aperture is 11 mm.
Strophocheilidae
Strophocheilidae is a taxonomic family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Acavoidea .- Subfamilies and genera :...
.
This species is also known as Drymaeus henselii and then it is placed in the subfamily Bulimulinae, family Orthalicidae
Orthalicidae
Orthalicidae are a family of tropical air-breathing land snails, terrestrial pulmonate gastropod mollusks are classified in the informal group Sigmurethra of the clade Stylommatophora...
.
This species was originally described by Eduard von Martens
Eduard von Martens
Eduard von Martens sometimes known as Carl or Karl Eduard von Martens, was a German zoologist.Born in Stuttgart in 1831, von Martens attended universities in Tübingen, Stuttgart and Munich, graduating from the University of Tübingen in 1855. In 1860, he set off as part of an expedition to the Far...
as Bulimulus henselii in 1868. The specific name is in honor of the German naturalist, paleontologist and zoologist Reinhold Hensel (1826–1881), who collected the first two specimens from which the species was described.
The type locality is Costa da Serra in the state Rio Grande do Sul
Rio Grande do Sul
Rio Grande do Sul is the southernmost state in Brazil, and the state with the fifth highest Human Development Index in the country. In this state is located the southernmost city in the country, Chuí, on the border with Uruguay. In the region of Bento Gonçalves and Caxias do Sul, the largest wine...
, which is the southernmost State of Brazil. This species is endemic to Brazil.
This species is accidentally listed twice in the Checklist of Rio Grande do Sul State (2009): as Drymaeus henselii (Martens, 1868) (subfamily Bulimulinae, family Orthalicidae) and as Gonyostomus henselii (Martens, 1868) in family Strophocheilidae. This species also inhabits Santa Catarina
Santa Catarina (state)
Santa Catarina is a state in southern Brazil with one of the highest standards of living in Latin America. Its capital is Florianópolis, which mostly lies on the Santa Catarina Island. Neighbouring states are Rio Grande do Sul to the south and Paraná to the north. It is bounded on the east by...
in Brazil (listed as Drymaeus henselii (Martens, 1868)).
Description
The shellGastropod shell
The gastropod shell is a shell which is part of the body of a gastropod or snail, one kind of mollusc. The gastropod shell is an external skeleton or exoskeleton, which serves not only for muscle attachment, but also for protection from predators and from mechanical damage...
is perforate, ovate-turrited, irregularly striate and sculptured with very delicate, very close spiral lines. The color of the shell is whitish, painted with brown streaks, which are confluent in the middle of each whorl. The apex
Apex (mollusc)
Apex is an anatomical term for the tip of the mollusc shell of a gastropod, scaphopod, or cephalopod mollusc.-Gastropods:The word "apex" is most often used to mean the tip of the spire of the shell of a gastropod...
is obtuse, brownish. The shell has 6 whorls
Whorl (mollusc)
A whorl is a single, complete 360° revolution or turn in the spiral growth of a mollusc shell. A spiral configuration of the shell is found in of numerous gastropods, but it is also found in shelled cephalopods including Nautilus, Spirula and the large extinct subclass of cephalopods known as the...
, that are rather flattened. The suture is irregularly undulating. The last whorl
Body whorl
Body whorl is part of the morphology of a coiled gastropod mollusk.- In gastropods :In gastropods, the body whorl, or last whorl, is the most recently-formed and largest whorl of a spiral or helical shell, terminating in the aperture...
is little convex below.
The aperture
Aperture (mollusc)
The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where part of the body of the animal emerges for locomotion, feeding, etc....
is subvertical, ovate-oblong, nearly half the length of the shell. The peristome is a little thickened, lightly spreading and white. The columellar margin is dilated, not closing the perforation, expanded above in a parietal lamina. Columella itself is twisted.
The length of the shell is 40 mm. The width of the shell is 28 mm. The height of the aperture is 20 mm. The width of the aperture is 11 mm.