Conoidea

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Conoidea
Conus californicus.jpg
A live Conus californicus, in situ, anterior end on the right
Scientific classification e
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Clade: Caenogastropoda
Clade: Hypsogastropoda
Clade: Neogastropoda
Superfamily: Conoidea
Fleming, 1822[1]
Families

See text

Conoidea is a superfamily of predatory sea snails, marine gastropod mollusks within the suborder Hypsogastropoda. This superfamily is a very large group of marine mollusks, estimated at about 340 recent valid genera and subgenera, and considered by one authority to contain 4,000 named living species (Puillandre et al. 2008).[2] This superfamily includes the turrids, the terebras (also known as auger snails or auger shells) and the cones or cone snails.[2] The phylogenetic relationships within this superfamily are poorly established. Several families (especially the Turridae), subfamilies and genera are thought to be polyphyletic.[2]

In contrast to Puillandre's estimate, Bandyopadhyay et al. (2008)[3] estimated that the superfamily Conoidea contains about 10,000 species. Tucker (2004) even speaks of 11,350 species in the group of taxa commonly referred to as turrids.[4] 3000 recent taxa are potentially valid species. Little more than half of the known taxa are fossil species. Many species are little known and need more investigation to find their exact systematic place.[4]

The superfamily is known for its toxoglossan radula, which is used to inject powerful neurotoxins into its prey; within the superfamily there are four somewhat different varieties of radula. [5]

The radula types [6] are as follows:

  • Type 1 Drilliidae type: five teeth in each row with comb-like lateral teeth and flat-pointed marginal teeth
  • Type 2 Turridae type: two or three teeth in a row with the marginal teeth being of the duplex or wishbone form.
  • Type 3 Pseudomelatomidae type: two or three teeth in a row with curved and solid marginal teeth.
  • Type 4 hypodermic type: two hollow, enrolled, marginal teeth in each row with an absent or reduced radular membrane.

In 2009, a proposed new classification of this superfamily was published by John K. Tucker and Manuel J. Tenorio. In 2011, a new classification of this superfamily was published by Bouchet et al. Both classifications were based upon cladistical analyses and included modern taxonomic molecular phylogeny studies.

Families[edit]

1993 taxonomy[edit]

Families and subfamilies included within the superfamily Conoidea according to Taylor, et al. 1993[7]

This same classification was accepted by Bouchet & Rocroi in 2005 [8]

2009 taxonomy[edit]

In 2009 John K. Tucker and Manuel J. Tenorio proposed a classification system for the cone shells and their allies (which resorb their inner walls during growth) based upon a cladistical analysis of anatomical characters including the radular tooth, the morphology (i.e. shell characters), as well as an analysis of prior molecular phylogeny studies, all of which were used to construct phylogenetic trees.[9] In their phylogeny, Tucker and Tenorio noted the close relationship of the cone species within the various clades, corresponding to their proposed families and genera; this also corresponded to the results of prior molecular studies by Puillandre et al. and others.[10][11][12][13][14][15][16] This 2009 proposed classification system also outlined the taxonomy for the other clades of Conoidean gastropods (that do not resorb their inner walls), also based upon morphological, anatomical, and molecular studies, and removes the turrid snails (which are a distinct large and diverse group) from the cone snails and creates a number of new families.[9] Tucker and Tenorio’s proposed classification system for the cone shells and their allies (and the other clades of Conoidean gastropods) is set forth at Tucker & Tenorio cone snail taxonomy 2009.

2011 taxonomy[edit]

The Taylor, et al. 1993 (and Bouchet & Rocroi in 2005) classification was thoroughly changed by the publication in 2011 of the article Bouchet P., Kantor Yu.I., Sysoev A. & Puillandre N. (2011) A new operational classification of the Conoidea. Journal of Molluscan Studies 77: 273–308. The authors presented a new classification of the Conoidea on the genus level, based on anatomical characters but also on the molecular phylogeny as presented by Puillandre N., et al., 2008.[17] They recognize fifteen families: Conidae, Terebridae, and the polyphyletic family Turridae resolved into 13 monophyletic families (containing 358 currently recognized genera and subgenera). The authors follow tentatively the classification for the family Conidae as presented by Tucker & Tenorio, 2009[9] who divided the monogeneric family Conidae into 82 genera. However, there is no final opinion on this issue yet, as a new molecular phylogeny of the Conidae is in preparation. There are a number of genera within the Conoidea that could not be assigned to any family.

Recognized Families in the Conoidea (as of 2012):

In 2012, a new lineage in the Conoidea was revealed, leading to the creation of a new family Bouchetispiridae Kantor, Strong & Puillandre, 2012 that includes one genus Bouchetispira Kantor, Strong & Puillandre, 2012 and one species Bouchetispira vitrea Kantor, Strong & Puillandre, 2012, which was found on an isolated sea mount off New Caledonia. This is probably the sole survivor of a larger clade.[18]

References[edit]

  1. ^ Fleming J. (June 1822). The philosophy of zoology, a general view of the structure, functions and classification of animals 2. Constable & Co., Edinburgh, 618 pp., Conidae is on the page 490.
  2. ^ a b c Puillandre, N.; Samadi, S.; Boisselier, M. -C.; Sysoev, A. V.; Kantor, Y. I.; Cruaud, C.; Couloux, A.; Bouchet, P. (2008). "Starting to unravel the toxoglossan knot: Molecular phylogeny of the "turrids" (Neogastropoda: Conoidea)". Molecular Phylogenetics and Evolution 47 (3): 1122–1134. doi:10.1016/j.ympev.2007.11.007. PMID 18180170.  edit
  3. ^ Bandyopadhyay, P. K.; Stevenson, B. J.; Ownby, J. P.; Cady, M. T.; Watkins, M.; Olivera, B. M. (2008). "The mitochondrial genome of Conus textile, coxI–coxII intergenic sequences and Conoidean evolution". Molecular Phylogenetics and Evolution 46 (1): 215–223. doi:10.1016/j.ympev.2007.08.002. PMC 2718723. PMID 17936021.  edit
  4. ^ a b Tucker, J.K. 2004 Catalog of recent and fossil turrids (Mollusca: Gastropoda). Zootaxa 682:1–1295.
  5. ^ Kantor, Yuri I.; Taylor (1991). "John D.". J. Mollus. Stud. 57 (1): 129–134. doi:10.1093/mollus/57.1.129. Retrieved 27 August 2011. 
  6. ^ Kantor, Yuri I.; Taylor (2000). "John D.". J.Zool.,Lond. 252: 251–262. Retrieved 27 August 2011. 
  7. ^ Taylor J. D., Kantor Y. I. & Sysoev A. V. (1993). "Foregut anatomy, feeding mechanisms, relationships and classification of Conoidea (Toxoglossa) (Gastropoda)". Bull. Nat. Hist. Mus. (Zool.) 59: 125–169.
  8. ^ Bouchet P., Rocroi J.-P., Frýda J., Hausdorf B., Ponder W., Valdés Á. & Warén A. (2005). "Classification and nomenclator of gastropod families". Malacologia: International Journal of Malacology (Hackenheim, Germany: ConchBooks) 47 (1–2): 1–397. ISBN 3-925919-72-4. ISSN 0076-2997
  9. ^ a b c Tucker J.K. & Tenorio M.J. (2009) Systematic classification of Recent and fossil conoidean gastropods. Hackenheim: Conchbooks. 296 pp., at p. 133
  10. ^ P.K. Bandyopadhyay, B.J. Stevenson, J.P. Ownby, M.T. Cady, M. Watkins, & B. Olivera (2008), The mitochondrial genome of Conus textile, coxI-conII intergenic sequences and conoidean evolution. Molecular Phylogenetics and Evolution 46: 215-223.
  11. ^ S.T. Williams & T.F. Duda, Jr. (2008), Did tectonic activity stimulate Oligo-Miocene speciation in the Indo-West Pacific? Evolution 62:1618-1634.
  12. ^ R.L. Cunha, R. Castilho, L. Ruber, & R. Zardoya (2005), Patterns of cladogenesis in the venomous marine gastropod genus Conus from the Cape Verde Islands Systematic Biology 54(4):634-650.
  13. ^ T.F. Duda, Jr. & A.J. Kohn (2005), Species-level phylogeography and evolutionary history of the hyperdiverse marine gastropod genus Conus, Molecular Phylogenetics and Evolution 34:257-272.
  14. ^ T.F. Duda, Jr. & E. Rolan (2005), Explosive radiation of Cape Verde Conus, a marine species flock, Molecular Ecology 14:267-272.
  15. ^ B. Vallejo, Jr. (2005), Inferring the mode of speciation in the Indo-West Pacific Conus (Gastropoda: Conidae), Journal of Biogeography 32:1429-1439.
  16. ^ N. Puillandre, S. Samadi, M. Boesselier, A. Sysoev, Y. Kantor, C. Cruaud, A. Couloux, & P. Bouchett (2008), Starting to unravel the toxoglossan knot: molecular phylogeny of the "turrid" (Neogastropoda: Conoidea), Molecular Phylogenetics and Evolution 47:1122-1134.
  17. ^ Puillandre N., et al., 2008 " Starting to unravel the toxoglossan knot: molecular phylogeny of the 'turrids' (Neogastropoda: Conoidea)". Molecular Phylogenetics and Evolution 2008;47:1122–1134
  18. ^ Kantor Y.I., Strong E.E. & Puillandre N. (2012) A new lineage of Conoidea (Gastropoda: Neogastropoda) revealed by morphological and molecular data. Journal of Molluscan Studies 78: 246–255

Further reading[edit]