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Neogastropoda
Clade of sea snails

Neogastropoda is an order of aquatic snails, both freshwater and marine gastropod molluscs.

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Description

The available fossil record of Neogastropoda is relatively complete, and supports a widely accepted evolutionary scenario of an Early Cretaceous origin of the group followed by two rapid diversification rounds in the late Cretaceous and the Paleocene.3

These sea snails have only one auricle, one kidney and one monopectinate gill, i.e. the gill filaments develop on only one side of the central axis.4

The shell has a well-developed siphonal canal. The elongated trunk-like siphon is an extensible tube, formed from a fold in the mantle. It is used to suck water into the mantle cavity. At the base of the siphon is the bipectinate (branching from a central axis) osphradium, a sensory receptacle and olfactory organ, that is more developed than the one in the Mesogastropoda. They achieved important morphological changes including e.g., the elongation of the siphonal canal, a shift in the mouth opening to a terminal position on the head, and the formation of a well-developed proboscis.5

The nervous system is very concentrated. Many species have the ganglia in a compact space.

The rachiglossate (rasp-like) radula, a layer of serially arranged teeth within the mouth, has only three denticles (small teeth) in each transverse row.6

The Neogastropoda have separate sexes.

There are about 16,000 species. Neogastropoda includes many well-known gastropods including the cone snails, conchs, mud snails, olive snails, oyster drills, tulip shells, and whelks. The Neogastropoda all live in the sea, except Clea, and Rivomarginella that are freshwater genera. The neogastropods are most diverse in tropical seas.7 They are mostly predators, but some are saprophagous (scavengers).

Taxonomy

According to the taxonomy of the Gastropoda by Bouchet & Rocroi (2005) the clade Neogastropoda consists of these superfamilies:

When Neogastropoda was an order, it was placed within the prosobranch gastropods according to the taxonomy developed by Thiele (1921). The families which used to form the order Neogastropoda are now included in the clade Neogastropoda Cox, 1960.

Ever since Thiele (1929),9 Neogastropoda have been considered a natural group, clearly differentiated from other Caenogastropoda.10 The monophyly of the group is widely accepted among morphologists, and it is based on several synapomorphies mostly related with the anatomy of the digestive system.11 Current classifications of Neogastropoda generally recognize up to six superfamilies: Buccinoidea, Muricoidea, Olivoidea, Pseudolivoidea, Conoidea, and Cancellarioidea. Phylogenetic relationships among neogastropod superfamilies based on morphological characters are rather unstable, and for instance, Cancellarioidea12 or Buccinoidea13 have been alternatively proposed as the sister group of the remaining Neogastropoda.14

Families

According to the taxonomy of the Gastropoda by Bouchet & Rocroi (2005) the taxonomy of clade Neogastropoda is as follows:

This article incorporates CC BY 2.0 text from the reference.15

  • Bandel, K. & Dockery, D.T. III (2012): Protoconch characters of Late Cretaceous Latrogastropoda (Neogastropoda and Neomesogastropoda) as an aid in the reconstruction of the phylogeny of the Neogastropoda. – Freiberger Forschungshefte, C 542 psf (20): 93-128, pls. 1-5.
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References

  1. "WoRMS - World Register of Marine Species - Neogastropoda". www.marinespecies.org. Retrieved 27 September 2018. http://www.marinespecies.org/aphia.php?p=taxdetails&id=146 ↩

  2. "Neogastropoda". Integrated Taxonomic Information System. Retrieved 27 September 2018. https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=73228 ↩

  3. Cunha R. L., Grande C. & Zardoya R. (23 August 2009). "Neogastropod phylogenetic relationships based on entire mitochondrial genomes". BMC Evolutionary Biology 2009, 9: 210. 10.1186/1471-2148-9-210 /wiki/BMC_Evolutionary_Biology ↩

  4. Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 376. ISBN 978-0-03-056747-6. 978-0-03-056747-6 ↩

  5. Cunha R. L., Grande C. & Zardoya R. (23 August 2009). "Neogastropod phylogenetic relationships based on entire mitochondrial genomes". BMC Evolutionary Biology 2009, 9: 210. 10.1186/1471-2148-9-210 /wiki/BMC_Evolutionary_Biology ↩

  6. Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 376. ISBN 978-0-03-056747-6. 978-0-03-056747-6 ↩

  7. Cunha R. L., Grande C. & Zardoya R. (23 August 2009). "Neogastropod phylogenetic relationships based on entire mitochondrial genomes". BMC Evolutionary Biology 2009, 9: 210. 10.1186/1471-2148-9-210 /wiki/BMC_Evolutionary_Biology ↩

  8. Bouchet P., Rocroi J.P., Hausdorf B., Kaim A., Kano Y., Nützel A., Parkhaev P., Schrödl M. & Strong E.E. (2017). Revised classification, nomenclator and typification of gastropod and monoplacophoran families. Malacologia. 61(1-2): 1-526 ↩

  9. Thiele J. (1929). Handbuch der Systematischen Weichtierkunde Volume 1 (1) (Loricata; Gastropoda: Prosobranchia). Jena, 376 pp. In: (23 October 1929). Reprint, Asher & Co., Amsterdam, 1963; translation by J.S. Bhatti Edited by: R. Bieler & P. Mikkelsen, Smithsonian Libraries, 1993. ↩

  10. Cunha R. L., Grande C. & Zardoya R. (23 August 2009). "Neogastropod phylogenetic relationships based on entire mitochondrial genomes". BMC Evolutionary Biology 2009, 9: 210. 10.1186/1471-2148-9-210 /wiki/BMC_Evolutionary_Biology ↩

  11. Cunha R. L., Grande C. & Zardoya R. (23 August 2009). "Neogastropod phylogenetic relationships based on entire mitochondrial genomes". BMC Evolutionary Biology 2009, 9: 210. 10.1186/1471-2148-9-210 /wiki/BMC_Evolutionary_Biology ↩

  12. Kantor YI. (1996). Phylogeny and Relationships of Neogastropoda. In: Taylor J. D. (ed.) Origin and Evolutionary Radiation of the Mollusca. Oxford, Oxford University Press, 221-230. ↩

  13. Ponder W. F., Colgan D. J., Healy J. M., Nützel A., Simone L. R. L. & Strong E. (2008). Caenogastropoda. In: Ponder W. F., Lindberg D. R. Phylogeny and evolution of the Mollusca. Berkeley, University of California Press, 331-383. ↩

  14. Cunha R. L., Grande C. & Zardoya R. (23 August 2009). "Neogastropod phylogenetic relationships based on entire mitochondrial genomes". BMC Evolutionary Biology 2009, 9: 210. 10.1186/1471-2148-9-210 /wiki/BMC_Evolutionary_Biology ↩

  15. Cunha R. L., Grande C. & Zardoya R. (23 August 2009). "Neogastropod phylogenetic relationships based on entire mitochondrial genomes". BMC Evolutionary Biology 2009, 9: 210. 10.1186/1471-2148-9-210 /wiki/BMC_Evolutionary_Biology ↩