Neoplanorbis

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Neoplanorbis
Neoplanorbis tantillus shell.jpg
Three views of a shell of Neoplanorbis tantillus oriented as if it were a dextral shell. (All planorbids are in fact sinistral.)
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Heterobranchia
clade Euthyneura
clade Panpulmonata
clade Hygrophila
Superfamily:
Planorboidea
Family:
Planorbidae
Subfamily:
Neoplanorbinae
Genus:
Neoplanorbis

Pilsbry, 1906 [1]

Neoplanorbis is a genus of small, freshwater, air-breathing snails. They are aquatic pulmonate gastropod mollusks in the family Planorbidae, the ram's horn snails.

Contents

Neoplanorbis is the type genus of the subfamily Neoplanorbinae. [2]

The shells of species in this genus appear to be dextral in coiling, but as is the case in all planorbids, the shell is actually sinistral. The shell is carried upside down with the aperture on the right, and this makes it appear to be dextral.

Species

The genus Neoplanorbis includes the following species:

Original description

Genus Neoplanorbis was originally described by Henry Augustus Pilsbry in 1906. [1]

Note that Pilsbry described the shell as if it were dextral, whereas planorbids are now known to be sinistral in shell coiling. In other words what Pilsbry describes as the "impressed and turned in" apex of the shell is actually the center of the umbilicus.

Pilsbry's original text (the original description) reads as follows:

Genus NEOPLANORBIS n. gen.

The shell is minute, subdiscoidal, nearly flat above, convex below, perforate, carinate at the periphery, composed of about two rapidly enlarging whorls, the apex impressed and turned in. The aperture is very oblique, wider than high, a little dilated at the base. Peristome thin, not continuous, the columellar margin straight and broadly dilated, somewhat thickened within.

The dentition and so far as known, the soft anatomy, is similar to Amphigyra .

Type N. tantillus .

The type of this group was at first taken for a Planorbis of the P. dilatatus group, (It was reported as Planorbis tantillus in Mr. Hinkley's list, Nautilus XVIII, p. 54.) but when the dentition was examined it became obvious at once that the snail could not belong to the Planorbinae. The radula is not materially unlike that of Amphigyra, but the conchological features of the two groups are quite diverse, Amphigyra being Crepiduloid with a distinct "deck" or columellar plate, while Neoplanorbis is Planorbis-shaped, perforate, with a carinate periphery and no "deck."

Related Research Articles

Planorbidae Family of gastropods

Planorbidae, common name the ramshorn snails or ram's horn snails, is a family of air-breathing freshwater snails, aquatic pulmonate gastropod molluscs. Unlike most molluscs, the blood of ram's horn snails contains iron-based hemoglobin instead of copper-based hemocyanin. As a result, planorbids are able to breathe oxygen more efficiently than other molluscs. The presence of hemoglobin gives the body a reddish colour. This is especially apparent in albino animals.

<i>Planorbis</i> Genus of gastropods

Planorbis is a genus of air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Planorbidae, the ram's horn snails, or planorbids. All species in this genus have sinistral or left-coiling shells.

<i>Planorbarius corneus</i> Species of gastropod

Planorbarius corneus, common name the great ramshorn, is a relatively large species of air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails, or planorbids, which all have sinistral or left-coiling shells.

<i>Vertigo arctica</i> Species of gastropod

Vertigo arctica is a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Vertiginidae, the whorl snails.

<i>Planorbella</i> Genus of gastropods

Planorbella is a genus of freshwater air-breathing snails, aquatic pulmonate gastropod mollusks in the family Planorbidae, the ram's horn snails, or planorbids, which all have sinistral, or left-coiling, shells.

<i>Achatinella bulimoides</i> Species of gastropod

Achatinella bulimoides is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Achatinellidae. This species is endemic to Hawaii.

<i>Achatinella byronii</i> Species of gastropod

Achatinella byronii is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Achatinellidae. This species is endemic to Oahu, in the Hawaiian Islands.

Achatinella sowerbyana is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Achatinellidae. This species is endemic to Hawaii.

<i>Achatinella vulpina</i> Species of gastropod

Achatinella vulpina is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Achatinellidae. This species is endemic to Hawaii.

Shoal sprite Species of gastropod

The shoal sprite was a species of minute, air-breathing, freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails. This species was endemic to Alabama, but it is now extinct.

<i>Amphigyra</i> Genus of gastropods

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

Ceratophallus socotrensis is a species of freshwater air-breathing snails, aquatic pulmonate gastropod mollusks in the family Planorbidae, the ram's horn snails, or planorbids. The snails in this species have sinistral or left-coiling shells. This species is endemic to Socotra, Yemen.

Glyptophysa is a genus of medium-sized sinistral (left-handed) air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family of Planorbidae.

†Neoplanorbis carinatus was a species of air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails.

†Neoplanorbis smithi was a species of small freshwater snail, an aquatic gastropod mollusk in the family Planorbidae, the ramshorn snails. This species was endemic to the United States; it is now extinct. The shells of this species appear to be dextral in coiling, but as is the case in all planorbids, the shell is actually sinistral. In life the shell was carried upside down with the aperture on the right, and this makes it appear to be dextral.

<i>Neoplanorbis tantillus</i> Species of gastropod

Neoplanorbis tantillus is a species of very small air-breathing freshwater snail, an aquatic gastropod mollusk in the family Planorbidae, the ram's horn snails. This species is endemic to the United States. In 2012, it has been declared extinct by the IUCN Red List of Threatened Species.

† Neoplanorbis umbilicatus was a species of air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails.

References

  1. 1 2 Pilsbry H. A. (September 1906). "Two new American genera of Basommatophora". The Nautilus20(5): 49–51.
  2. ↑ Bouchet, Philippe; Rocroi, Jean-Pierre; Frýda, Jiri; Hausdorf, Bernard; Ponder, Winston; Valdés, Ángel & Warén, Anders (2005). "Classification and nomenclator of gastropod families". Malacologia . Hackenheim, Germany: ConchBooks. 47 (1–2): 1–397. ISBN   3-925919-72-4. ISSN   0076-2997.
  3. ↑ Bogan, A.E. (2000). "Neoplanorbis carinatus". IUCN Red List of Threatened Species . 2000: e.T14553A4444062. doi: 10.2305/IUCN.UK.2000.RLTS.T14553A4444062.en . Retrieved 14 November 2021.
  4. ↑ Bogan, A.E. (2000). "Neoplanorbis smithi". IUCN Red List of Threatened Species . 2000: e.T14554A4444132. doi: 10.2305/IUCN.UK.2000.RLTS.T14554A4444132.en . Retrieved 14 November 2021.
  5. ↑ Cordeiro, J. & Perez, K. 2012. Neoplanorbis tantillus. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 20 October 2012.
  6. ↑ Bogan, A.E. (2000). "Neoplanorbis umbilicatus". IUCN Red List of Threatened Species . 2000: e.T14555A4444202. doi: 10.2305/IUCN.UK.2000.RLTS.T14555A4444202.en . Retrieved 14 November 2021.
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