Orthonychiidae

†Orthonychiidae is an extinct taxonomic family of fossil sea snails, marine, gastropod mollusks in the clade Cyrtoneritimorpha.[2]

Orthonychiidae
Temporal range: Mid Ordovician–Devonian[1]
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Superfamily: †Platyceratoidea
Family: †Orthonychiidae
Bandel & Frýda, 1999

There is an unusually great degree of variability within the shells of species in the genus Orthonychia,[1] but an analysis of this variability has not been done yet (2008).[1]

Genera

Genus Orthonychia Hall, 1843[3]

  • Orthonychia acuta Roemer, 1856
  • Orthonychia baldwini Rohr et al., 1981
  • Orthonychia belli Clarke, 1908
  • Orthonychia bowsheri Yochelson, 1956
  • Orthonychia chesterense Meek & Worthen, 1866
  • Orthonychia concavum Hall, 1860
  • Orthonychia conicum Hall, 1860
  • Orthonychia conoidea (Goldfuss, 1844)
  • Orthonychia cornuforme (Winchell, 1863)
  • Orthonychia costata (Barrois, 1889)
  • Orthonychia daschi (Rohr & Smith, 1978)
  • Orthonychia dentalium Hall, 1862
  • Orthonychia enorme (Lindström, 1884)
  • Orthonychia infabricatus Hyde, 1953
  • Orthonychia marblecreekensis Talent & Philip, 1956
  • Orthonychia obliquesulata Spitz, 1907
  • Orthonychia pajerensis Chronic, 1949
  • Orthonychia parva (Shumard & Swallow, 1858)
  • Orthonychia parvulum Whiteaves, 1892
  • Orthonychia pentalvea Talent & Philip, 1956
  • Orthonychia perplexum (Hall, 1879)
  • Orthonychia prosseri Clarke & Swartz, 1913
  • Orthonychia protei (Oehlert, 1883)[1]
  • Orthonychia puellaris (Whidborne, 1891)
  • Orthonychia quadrangularis (Whidborne, 1891)
  • Orthonychia rostratus (Trenkner, 1867)
  • Orthonychia sciotoensis Hyde, 1953
  • Orthonychia sileni (Oehlert, 1883)
  • Orthonychia subrectum Hall, 1860 - type species
  • Orthonychia talon Tolmachoff, 1930
  • Orthonychia tortuosa (Hall, 1860)
  • Orthonychia trirotundolobatum (Talent & Philip, 1956)
  • Orthonychia unguiculata Clarke & Swartz, 1913
  • Orthonychia variablis Tyler, 1965
  • Orthonychia vishtytica Saladzius, 1966
  • Orthonychia vomerium (Winchell, 1863)
  • Orthonychia waverlyensis Hyde, 1953
  • Orthonychia compressa / Platyceras (Orthonychia) compressum Girty 1910[4]
  • Orthonychia ungula / Platyceras (Orthonychia) ungula (Weller, 1906)[5]
gollark: That is an arbitrary and silly dividing line.
gollark: This is "unnatural" or whatever but it's probably good to have vitamin D in sufficient quantity.
gollark: I take vitamin D supplements because I was apparently somewhat horribly deficient when blood tested some time ago, for instance.
gollark: Well, by the definition of "optimal", you probably want to improve them, see.
gollark: It's not like bodies are automatically perfect and optimal™.

References
  1. Frýda, J.; Racheboeuf, P. R.; Frýdová, B. (2008). "Mode of life of Early Devonian Orthonychia protei (Neritimorpha, Gastropoda) inferred from its post-larval shell ontogeny and muscle scars". Bulletin of Geosciences: 491–502. doi:10.3140/bull.geosci.2008.04.491.
  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. Hall J. (1843). "Geology of New York. Part IV, comprising the survey of the fourth geological district". Natural History of New York 4: 1-683.
  4. "†Platyceras (Orthonychia) compressum Girty 1910 (snail)". Paleobiology Database, accessed 8 August 2010.
  5. "†Platyceras (Orthonychia) ungula Weller 1906 (snail)". Paleobiology Database, accessed 8 August 2010.


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