Perplexiconus

Perplexiconus has become a synonym of Conasprella (Ximeniconus) Emerson & Old, 1962, a subgenus of sea snails, marine gastropod mollusks in the family Conidae, the cone snails and their allies.[1]

Perplexiconus
Apertural view of shell of Conasprella perplexa (G. B. Sowerby II, 1857)
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Caenogastropoda
clade Hypsogastropoda
clade Neogastropoda
Superfamily:
Conoidea
Family:
Conidae
Genus:
Conasprella
Subgenus:
Ximenoconus

Emerson & Old, 1962
Synonyms

Conasprella (Ximeniconus) Emerson & Old, 1962

In the new classification of the family Conidae by Puillandre N., Duda T.F., Meyer C., Olivera B.M. & Bouchet P. (2015), Perplexiconus has become a subgenus of Conasprella: Conasprella (Ximenoconus) Tucker & Tenorio, 2009 represented as Conasprella Thiele, 1929 [2]

Distinguishing characteristics

The Tucker & Tenorio 2009 taxonomy distinguishes Perplexiconus from Conus in the following ways:[3]

Shell characters (living and fossil species)
The basic shell shape is conical to elongated conical, has a deep anal notch on the shoulder, a smooth periostracum and a small operculum. The shoulder of the shell is usually nodulose and the protoconch is usually multispiral. Markings often include the presence of tents except for black or white color variants, with the absence of spiral lines of minute tents and textile bars.
Radular tooth (not known for fossil species)
The radula has an elongated anterior section with serrations and a large exposed terminating cusp, a non-obvious waist, blade is either small or absent and has a short barb, and lacks a basal spur.
Geographical distribution
These species are found in the Indo-Pacific region.
Feeding habits
These species eat other gastropods including cones.[3]
  • Subgenus Ximenoconus Emerson & Old, 1962
Shell characters (living and fossil species)
The shell is cylindrical in shape with a conical spire and angulate shoulders. The protoconch is either paucispiral or multispiral. The whorl tops do not have cords. Nodules are absent, however the shell may be ornamented with an undulating carina. The posterior notch is moderate to deep, and the anterior notch is well developed. The periostracum is smooth, and the operculum is small.
Radular tooth (not known for fossil species)
The anterior section of the radular tooth is shorter than the posterior section, and there is no posterior blade. A posterior fold is present. There is a blunt shaft fold which is blunt at its anterior end. A basal spur is present, and the barb and blade are short.
Geographical distribution
The species in this genus occur in the West Atlantic and Eastern Pacific regions.
Feeding habits
These cone snails are vermivorous, meaning that they prey on polychaete worms.[3]

Species list

This list of species is based on the information in the World Register of Marine Species (WoRMS) list. Species within the genus Perplexiconus include:[1]

The following species names are recognized as "alternate representations" (see full explanation below) in contrast to the traditional system, which uses the genus Conus for all species in the family:[1]

  • Perplexiconus baccatus (G.B. Sowerby III, 1877) is equivalent to Conus baccatus G. B. Sowerby III, 1877
  • Perplexiconus lucidus (W. Wood, 1828) is equivalent to Conus lucidus W. Wood, 1828 (alternate representation)
  • Perplexiconus perplexus (G.B. Sowerby II, 1857) is equivalent to Conasprella perplexa G. B. Sowerby II, 1857
  • Perplexiconus puncticulatus (Hwass in Bruguière, 1792) is equivalent to Conus puncticulatus Hwass in Bruguière, 1792 (alternate representation)
  • Perplexiconus wendrosi Tenorio & Afonso, 2013 : synonym of Conasprella wendrosi (Tenorio & Afonso, 2013) (alternate representation)

Significance of "alternative representation"

Prior to 2009, all cone species were placed within the family Conidae and were placed in one genus, Conus. In 2009 however, J.K. Tucker and M.J. Tenorio proposed a classification system for the over 600 recognized species that were in the family. Their classification proposed 3 distinct families and 82 genera for the living species of cone snails, including the family Conilithidae. This classification was based upon shell morphology, radular differences, anatomy, physiology, cladistics, with comparisons to molecular (DNA) studies.[3] Published accounts of genera within the Conidae (or Conilithidae) that include the genus Perplexiconus include J.K. Tucker & M.J. Tenorio (2009), and Bouchet et al. (2011).[4]

Testing in order to try to understand the molecular phylogeny of the Conidae was initially begun by Christopher Meyer and Alan Kohn,[5] and is continuing, particularly with the advent of nuclear DNA testing in addition to mDNA testing.

However, in 2011, some experts still use the traditional classification, where all species are placed in Conus within the single family Conidae: for example, according to the current November 2011 version of the World Register of Marine Species, all species within the family Conidae are in the genus Conus. The binomial names of species in the 82 cone snail genera listed in Tucker & Tenorio 2009 are recognized by the World Register of Marine Species as "alternative representations."[6] Debate within the scientific community regarding continues, and additional molecular phylogeny studies are being carried out in an attempt to clarify the issue.[3][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]

All this has been superseded in 2015 by the new classification of the Conidae [2]

References
  1. Bouchet, P. (2015). Perplexiconus Tucker & Tenorio, 2009. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=580589 on 2015-03-25
  2. Puillandre N., Duda T.F., Meyer C., Olivera B.M. & Bouchet P. (2015). One, four or 100 genera? A new classification of the cone snails. Journal of Molluscan Studies. 81: 1-23
  3. Tucker J.K. & Tenorio M.J. (2009), Systematic Classification of Recent and Fossil Conoidean Gastropods, ConchBooks, Hankenheim, Germany, 295 pp.
  4. Bouchet P., Kantor Yu.I., Sysoev A. & Puillandre N. (2011). "A new operational classification of the Conoidea". Journal of Molluscan Studies 77: 273-308.
  5. Interview of Professor Alan Kohn, Professor Emeritus, Zoology "SEASHELL COLLECTOR | Interview of Pr Alan Kohn, Professor Emeritus, Zoology". Archived from the original on 2012-02-27. Retrieved 2011-12-04.
  6. http://www.marinespecies.org/aphia.php?p=taxdetails&id=14107 Classification: Traditionally, all cone shells have been included in the Linnaean genus Conus. Tucker & Tenorio (2009) have recently proposed an alternative shell- and radula-based classification that recognizes 4 families and 80 genera of cones. In WoRMS, we currently still recognize a single family Conidae (following Puillandre et al. 2011), but Tucker & Tenorio's 80 genera classification is presented as "alternative representation". [P. Bouchet, 14 Aug. 2011]
  7. C.M.L. Afonso & M.J. Tenorio (August 2011), A new, distinct endemic Africonus species (Gastropoda, Conidae) from Sao Vicente Island, Cape Verde Archipelago, West Africa, Gloria Maris 50(5): 124-135
  8. P. Bouchet, Yu I. Kantor, A. Sysoev, and N. Puillandre (March 2011), A New Operational Classification of the Conoidea, Journal of Molluscan Studies 77:273-308, at p. 275.
  9. N. Puillandre, E. Strong, P. Bouchet, M. Boisselier, V. Couloux, & S. Samadi (2009), Identifying gastropod spawn from DNA barcodes: possible but not yet practicable, Molecular Ecology Resources 9:1311-1321.
  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. Tucker, J. K. & Stahlschmidt, P. (2010) A second species of Pseudoconorbis (Gastropoda: Conoidea) from India. Miscellanea Malacologica 4(3):31-34.
  17. Tucker, J. K., Tenorio, M. J. & Stahlschmidt, P. (2011) The genus Benthofascis (Gastropoda: Conoidea): a revision with descriptions of new species. Zootaxa 2796:1-14.
  18. Puillandre N., Meyer C.P., Bouchet P., and Olivera B.M. (2011), Genetic divergence and geographical variation in the deep-water Conus orbignyi complex (Mollusca: Conoidea), Zoologica Scripta 40(4) 350-363.
  19. Tucker, J. K. & Tenorio, M. J. (2011) New species of Gradiconus and Kohniconus from the western Atlantic (Gastropoda: Conoidea: Conidae, Conilithidae). Miscellanea Malacologica 5(1):1-16.
  20. Petuch, E. J. & Sargent, D. M. (2011) New species of Conidae and Conilithidae (Gastropoda) from the tropical Americas and Philippines. With notes on some poorly-known Floridian species. Visaya 3(3):116-137.
  21. Petuch & Drolshage (2011) Compendium of Florida Fossil Shells, Volume 1 MDM Publications, Wellington, FL., 432 pp.

Further reading
  • Kohn A. A. (1992). Chronological Taxonomy of Conus, 1758-1840". Smithsonian Institution Press, Washington and London.
  • Monteiro A. (ed.) (2007). The Cone Collector 1: 1-28.
  • Berschauer D. (2010). Technology and the Fall of the Mono-Generic Family The Cone Collector 15: pp. 51-54
  • Puillandre N., Meyer C.P., Bouchet P., and Olivera B.M. (2011), Genetic divergence and geographical variation in the deep-water Conus orbignyi complex (Mollusca: Conoidea), Zoologica Scripta 40(4) 350-363.
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