Overview
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Stenothecidae is an extinct family of univalved Cambrian molluscs. (Do not confuse with Cambrian problematic invertebrates with bivalved (dorsal and ventral) shell, members of the class Stenothecoida1]).
Morphology
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The group comprises conical laterally compressed shells that may be smooth or ornamented with folds or ribs.[3] The shells are broadly limpet-like, which led to their initial consideration as monoplacophoran molluscs.[1]
Taxonomy
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The taxonomic position of the group is unclear;[4] it has been classified as a Yochelcionelloid or Helcionelloid,[5]. It is not obviously in the stem group of any modern molluscan class and has been referred to the monoplacophora,[3] although the monoplacophora are no longer considered to be a clade, and thus the classification means little more than "primitive mollusc".[6]
Genera
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The family Stenothecidae consists of two subfamilies and the following genera:
- Stenothecinae Runegar & Jell, 1980 - synonym: Mellopegmidae Missarzhevsky, 1989[7]
- Stenotheca Salter [in Hicks], 1872 - type genus of the family Stenothecidae
- Mellopegma Runegar & Jell, 1976
Taxonomy
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The Class Stenothecoida is further organized into finer groupings including:
- Order (1): Cambridioida
- Species: ZipcodeZoo has pages for 9 species and subspecies in the Class Stenothecoida.
Orders
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Cambridioida
At least 9 species and subspecies belong to the Order Cambridioida.
More info about the Order Cambridioida may be found here.
References
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- ^ a b c Yochelson, E. L. (1969). "Stenothecoida, A Proposed New Class of Cambrian Mollusca". Lethaia 2: 49?62. doi:10.1111/j.1502-3931.1969.tb01250.x. edit
- ^ Runegar & Jell. 1980. Alcheringa, 4(2): 111.
- ^ a b Runnegar , B.; Pojeta J, J. (Oct 1974). "Molluscan Phylogeny: the Paleontological Viewpoint". Science 186 (4161): 311?317. Bibcode 1974Sci...186..311R. doi:10.1126/science.186.4161.311. JSTOR 1739764. PMID 17839855. edit
- ^ Bouchet P., Rocroi J.-P., Fr?da J., Hausdorf B., Ponder W., Vald?s ?. & War?n A. (2005). "Classification and nomenclator of gastropod families". Malacologia: International Journal of Malacology (Hackenheim, Germany: ConchBooks) 47 (1-2): 1?39 7. ISBN 3925919724. ISSN 0076-2997. http://www.archive.org/details/malacologia47122005inst.
- ^ Parkhaev, P. Yu..
- ^ Budd, G. E.; Jensen, S. (2000). "A critical reappraisal of the fossil record of the bilaterian phyla". Biological Reviews of the Cambridge Philosophical Society 75 (2): 253?295. doi:10.1017/S000632310000548X. PMID 10881389. edit
- ^ (Russian) Missar zhevsky. (after 10 July) 1989. Drevneishie skeletnye okamenelosti i stratigrafiia pogranichnykh tolshch Dokembriia i Kembiia. (English translation: Oldest skeletal fossils and stratigraphy of Precambian and Cambrian boundary beds.) Trudy Geologicheskogo Instituta, Akademia Nauk SSSR, 443, 237 pp., 32 plates. Mellopegmidae is on the page 179.
- ^ Parkhaev P. Yu. 2001. Molluscs and siphonoconchs. In: Alexander E. M. et al. (eds.) The Cambrian biostratigraphy of the Stansbury basin, South Australia. Transactions of the Paleontological Institute, Russian Academy of Sciences, 282: 133-210, plates 24-54. Watsonellinae on the page 187.
- ^ Grabau A. W. 1900. Palaeontology of the Cambrian terranes of the Boston Basin. Occasional Papers of the Boston Society of Natural History 4:601-694.
Further Reading
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- Kouchinsky, A. V. (1999). "Shell microstructures of the Early Cambrian Anabarella and Watsonella as new evidence on the origin of the Rostroconchia". Lethaia 32 (2): 173?180. doi:10.1111/j.1502-3931.1999.tb00537.x. edit
- http://www.palaeos.org/Stenothecoida
Sources
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