Valvata oregonensis

Last updated

Valvata oregonensis
Temporal range: Pliocene–Pleistocene
Valvata oregonensis.jpg
Two views of the type specimen of Valvata oregonensis. Width: 8.0 mm, height: 5.0 mm.
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Heterobranchia
Family: Valvatidae
Genus: Valvata
Species:
V. oregonensis
Binomial name
Valvata oregonensis
Hanna, 1922 [1]
Synonyms

Valvata whitei Hannibal, 1900
Valvata calli Hannibal, 1910
Valvata tricarinata (Say, 1817) (in part)

Contents

Valvata oregonensis is a species of fossil freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Valvatidae, the valve snails.

Taylor (1966) stated that Valvata oregonensis is a synonym of Valvata whitei . [2] Despite that the name Valvata oregonensis is still used (for example Pierce 1993 [3] ).

Distribution

The type locality for this species is the Warner Lakes beds in eastern Oregon. The age is Pliocene. [1]

Valvata oregonensis was a very common species in eastern Oregon during the Pleistocene. The University of Oregon collection contains specimens from numerous localities around the Warner Lakes beds, Snake River Valley and in Lake County. [1]

Description

The shell is composed of four whorls, marked with none to three spiral carinae. The spire is normally low and umbilicus is wide, exposing all the whorls to the apex. There is great variation in the height of the spire and with its increase there is a proportionate decrease in the width of the umbilicus. The apical two whorls are flat and planulate, smooth and shining, unmarked with carinae even when the remainder of the shell may have three. Sculpture is comparatively uniform in character, being composed of fine growth lines. [1]

This species is characterized by its flat nuclear whorls and generally flat shell. Only rarely is the spire as elevated, while great numbers are as flat as the lowest. The thickness of the shells is greater than in any other Valvata species. [1]

Dimensions of the holotype and paratypes are as follows: The width of the shell is 4.6-8.0 mm. The height of the shell is 2.6-5.4 mm. [1] In general the width of shell can reach up to 10 mm [1] and so this is the largest species of North American Valvata. [1]

Related Research Articles

<span class="mw-page-title-main">Gastropod shell</span> Part of the body of a gastropod or snail

The gastropod shell is part of the body of a gastropod or snail, a kind of mollusc. The shell is an exoskeleton, which protects from predators, mechanical damage, and dehydration, but also serves for muscle attachment and calcium storage. Some gastropods appear shell-less (slugs) but may have a remnant within the mantle, or in some cases the shell is reduced such that the body cannot be retracted within it (semi-slug). Some snails also possess an operculum that seals the opening of the shell, known as the aperture, which provides further protection. The study of mollusc shells is known as conchology. The biological study of gastropods, and other molluscs in general, is malacology. Shell morphology terms vary by species group.

<span class="mw-page-title-main">Chinese mystery snail</span> Species of gastropod

The Chinese mystery snail, black snail, or trapdoor snail, is a large freshwater snail with gills and an operculum, an aquatic gastropod mollusk in the family Viviparidae. The Japanese variety of this species is black and usually a dark green, moss-like alga covers the shell.

<i>Chytra kirki</i> Species of gastropod

Chytra kirki is a species of tropical freshwater snail with an operculum, aquatic gastropod mollusk in the family Paludomidae.

<i>Clappia umbilicata</i> Species of gastropod

Clappia umbilicata, the umbilicate pebblesnail, was a species of small freshwater snail that had an operculum, an aquatic gastropod mollusk in the family Lithoglyphidae. This species is now extinct.

<i>Sinployea decorticata</i> Extinct species of land snail

Sinployea decorticata a species of small air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Charopidae. This species was endemic to the Cook Islands; it is now extinct.

<span class="mw-page-title-main">Thickshell pondsnail</span> Species of gastropod

Ladislavella utahensis, common name the thickshell pondsnail, is a species of air-breathing freshwater snail, an aquatic pulmonate gastropod mollusc in the family Lymnaeidae, the pond snails. This species is endemic to Utah Lake in the United States. The last living snails were found in the early 1930s.

<span class="mw-page-title-main">Utah roundmouth snail</span> Species of gastropod

The Utah roundmouth snail, also known as the Utah valvata or desert valvata, scientific name Valvata utahensis, is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusc in the family Valvatidae, the valve snails.

<i>Valvata</i> Genus of gastropods

Valvata is a genus of very small freshwater snails with an operculum, aquatic gastropod mollusks in the family Valvatidae, the valve snails.

<i>Radix auricularia</i> Species of gastropod

Radix auricularia, the big-ear radix, is a species of medium-sized freshwater snail, an aquatic pulmonate gastropod mollusk in the family Lymnaeidae.

<i>Valvata cristata</i> Species of gastropod

Valvata cristata is a species of minute freshwater snail with an operculum, an aquatic gastropod mollusk or micromollusk in the family Valvatidae, the valve snails.

<i>Valvata piscinalis</i> Species of gastropod

Valvata piscinalis, common name the European stream valvata or European valve snail, is a species of minute freshwater snail with gills and an operculum, an aquatic gastropod mollusk in the family Valvatidae, the valve snails. It is also known as Cincinna piscinalis.

Menetus dilatatus is a species of small air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails.

<i>Urticicola umbrosus</i> Species of gastropod

Urticicola umbrosus is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Hygromiidae, the hairy snails and their allies.

Felipponea elongata is a species of large freshwater snail with an operculum, an aquatic gastropod mollusk in the family Ampullariidae, the apple snail family.

Choristella hickmanae is a species of sea snail, a marine gastropod mollusk in the family Lepetellidae.

<i>Staffordia staffordi</i> Species of gastropod

Staffordia staffordi is a species of air-breathing land snail, terrestrial pulmonate gastropod mollusk in the family Staffordiidae.

<i>Theodoxus altenai</i> Species of gastropod

Theodoxus altenai is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Neritidae, the nerites.

<i>Margarites pupillus</i> Species of gastropod

Margarites pupillus, common name the puppet margarite or the little margarite, is a species of sea snail, a marine gastropod mollusk in the family Margaritidae, the turban snails.

<i>Lirularia acuticostata</i> Species of gastropod

Lirularia acuticostata, common name the sharp-keeled lirularia, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.

<i>Minolia peramabilis</i> Species of gastropod

Minolia peramabilis, common name the lovely Pacific margarite, is a species of sea snail, a marine gastropod mollusk in the family Solariellidae.

References

This article incorporates public domain text from reference. [1]

  1. 1 2 3 4 5 6 7 8 9 Hanna G. D. (August) 1922. Fossil Freshwater Mollusks from Oregon Contained in the Condon Museum of the University of Oregon. Volume I, number 12. page 11-12, plate 3. plate 4, figures 1-4.
  2. ↑ Taylor D. W. 1966. Summary of North American Blancan nonmarine mollusks. Malacologia, volume 4(1), 1-172. page 132.
  3. ↑ Pierce H. G. 1993. The Nonmarine Mollusks of the Late Oligocene-Early Miocene Cabbage Patch Fauna of Western Montana III. Aquatic Mollusks and Conclusions. Journal of Paleontology, Vol. 67, No. 6 (Nov., 1993), pp. 980-993.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.