Stromboidea

Stromboidea
Three shells of species in the Stromboidea
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Littorinimorpha
Superfamily: Stromboidea
Rafinesque, 1815[1]
Families

See text

The Stromboidea, originally named the Strombacea by Rafinesque in 1815, is a superfamily of medium-sized to very large sea snails in the clade Littorinimorpha.[2]

Morphology

Shell

Stromboideans have medium to large shells, attaining a wide variety of lengths depending on the species (20–400 mm[3] from the smallest aporrhaids to the largest strombids). A stromboidean shell has a medium (e.g. spider conchs, Lambis spp.) to high spire (e.g. tibias, Tibia spp.), and a thickened and frequently expanded outer lip (e.g. the queen conch, Lobatus gigas, or the goliath conch, Lobatus goliath) that may be ornamented by long spines (e.g. the spider conch, Lambis chiragra, common pelican foot, Aporrhais spp.) or digitations (e.g. the millipede spider conch, Lambis millepeda). The anterior portion of the outer lip may present a stromboid notch, an indentation through which one of the animal's long eyestalks may protrude.[3]

The shell morphology of some stromboideans (e.g. Lobatus gigas) is not solely determined by the animal's genes; environmental conditions such as location, diet, temperature and depth, and biological interactions such as predation, can greatly affect it.[4] Juvenile individuals of some species develop heavier shells when exposed to predators. They also develop wider and thicker shells with fewer but longer spines in deeper water.[5]

Taxonomy

This superfamily was previously known as Strombacea. Prior to the recent ruling by the ICZN, many invertebrate superfamily names ended in the suffix -acea, or -aceae, not -oidea as now required according to ICZN article 29.2. The suffix -oidea used to be used for some subclasses and superorders, where it is still found. In much of the older literature including Keen 1958, Moore and colleagues 1952, and the Treatise on Invertebrate Paleontology, gastropod superfamilies are written with the suffix -acea.[6][7][8]

2005 taxonomy

According to the classification proposed by Bouchet & Rocroi (2005),[9] the families and subfamilies in the superfamily Stromboidea are as follows. Fossil families are marked with a dagger †.

2008 taxonomy

Some authors[who?] consider[why?] two following families as separate families:

Phylogeny

Struthiolariidae
Phylogeny and relationships of Stromboidea according to Simone (2005)[10]

The phylogenetic relationships among the Stromboidea have been addressed in 2005, by Simone. The author proposed a cladogram (a tree of descent) based on an extensive morpho-anatomical analysis of representatives of Aporrhaidae, Strombidae, Xenophoridae and Struthiolariidae.[10]

In his analysis, Simone recognized Strombidae as a monophyletic taxon supported by 13 synapomorphies (traits that are shared by two or more taxa and their most recent common ancestor), with at least eight distinct genera. He considered the genus Terebellum as the most basal taxon, distinguished from the remaining strombids by 13 synapomorphies, including a rounded foot.[10] Though the genus Tibia was left out of the analysis, Simone regarded it as probably closely related to Terebellum, apparently due to some well known morphological similarities between them.[10]

Ecology and behavior

Stromboideans are exclusively marine, and most species inhabit shallow waters.[3] Adult individuals may be epifaunal, remaining partially buried in the sand or never burying at all (e.g. Strombidae), but may also be infaunal, remaining buried for most of their lifetime (Struthiolariidae).[3][11]

Feeding habits

Herbivory is the most common feeding habit among stromboideans. Snails in the family Strombidae were widely accepted as carnivores by several authors in the 19th century, a concept that persisted until the first half of the 20th century. This erroneous idea evidently originated in the writings of Jean-Baptiste Lamarck, who classified strombids with other supposedly carnivorous snails. This idea was subsequently repeated by other authors, but were not supported by observation.[12] Nowadays, strombids are known to be specialized herbivores and occasional detritivores. They are usually associated with shallow water reefs and seagrass meadows.[3]

Struthiolariids are ciliary mucous feeders, obtaining their nutrition from particles and organic matter suspended in the water. While remaining completely buried in the sand, struthiolariids are connected to the surface by two artificially produced holes. These holes are made by the animal's proboscis, held in place with mucus, and are used for inhalating and exhalating water. Feeding particles are captured as the inhaled water flows over the animal's gills, become embedded in mucus, and are moved along a ciliary tract that leads to the animal's mouth, where they are finally ingested.[3]

References

  1. ^ Rafinesque C. R. (1815). Analyse de la nature 145.
  2. ^ MolluscaBase eds. (2020). MolluscaBase. Stromboidea Rafinesque, 1815. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=14770 on 2020-05-24
  3. ^ a b c d e f Beesley, P. L.; Ross, G. J. B.; Wells, A. (1998). Mollusca: The Southern Synthesis. Fauna of Australia: Part B. Melbourne, AU: CSIRO Publishing. p. 766. ISBN 0-643-05756-0.
  4. ^ Tewfik, A. (1991)."An assessment of the biological characteristics, abundance, and potential yield of the queen conch (Strombus gigas L.) fishery on the Pedro Bank off Jamaica". Thesis submitted in partial fulfilment of the requirements for the Degree of Masters of Science (Biology). Acadia University, Canada.
  5. ^ McCarthy, K. (2007). "A review of queen conch (Strombus gigas) life-history". Sustainable Fisheries Division NOAA. SEDAR 14-DW-4.
  6. ^ Keen A. M. (1958). Sea Shells of Tropical West America. Stanford University Press.
  7. ^ Moore, Lalicker & Fischer (1952).Invertebrate Fossils. McGraw-Hill Book.
  8. ^ Treatise on Invertebrate Paleontology; part K (Nautiloidea) 1964 and part L (Ammonoidea) 1962; Geological Society of America and Univ. of Kansas Press.
  9. ^ Bouchet P. & Rocroi J.-P. (Ed.); Frýda J., Hausdorf B., Ponder W., Valdes A. & Warén A. 2005. Classification and nomenclator of gastropod families. Malacologia: International Journal of Malacology, 47(1-2). ConchBooks: Hackenheim, Germany. ISBN 3-925919-72-4. ISSN 0076-2997. 397 pp. http://www.vliz.be/Vmdcdata/imis2/ref.php?refid=78278
  10. ^ a b c d Simone, L. R. L. (2005). "Comparative morphological study of representatives of the three families of Stromboidea and the Xenophoroidea (Mollusca, Caenogastropoda), with an assessment of their phylogeny". Arquivos de Zoologia. 37 (2). São Paulo, Brazil: Museu de Zoologia da Universidade de São Paulo: 141–267. doi:10.11606/issn.2176-7793.v37i2p141-267. ISSN 0066-7870.
  11. ^ Savazzi, E. (1989). "New observations on burrowing in strombid gastropods". Stuttgarter Beiträge zur Naturkunde. Serie A (Biologie) (434). Staatliches Museum für Naturkunde: 1–10. ISSN 0341-0145.
  12. ^ Robertson, R. (1961). "The feeding of Strombusand related herbivorous marine gastropods". Notulae Naturae of the Academy of Natural Sciences of Philadelphia (343): 1–9.
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