Biology:Mongolepidida
| Mongolepidida | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia
|
| Phylum: | |
| Class: | Chondrichthyes
|
| Subclass: | |
| Order: | †Mongolepidida Karatajute-Talimaa et al., 1990
|
| Genera | |
| |
The Mongolepidida is an order of primitive elasmobranchs that lived during the Late Silurian and Early Devonian periods of Russia and Mongolia, with possible fragmentary remains dating back to the Katian epoch of the Late Ordovician (c.450 Ma).[1] The three known genera are: Elegestolepis,[2] Mongolepis[3] and Polymerolepis.[4][1][5][6] They are only known from fragmentary placoid scales, so their appearance is unknown. The oldest of these scales have been dated back to the Ludlow epoch (427.4 Ma to 423 Ma), making the members of the Mongolepidida possibly the oldest sharks known to date.[7]
Although the placoid scales of the Mongolepidida are accepted to be those of sharks, subtle differences in the scales suggest that they may have been quite different in appearance to modern sharks. It is not known what they looked like due to the fragmentary nature of the known remains.[8]
References
- ↑ 1.0 1.1 Andreev, Plamen; Coates, Michael I.; Karatajūtė-Talimaa, Valentina; Shelton, Richard M.; Cooper, Paul R.; Wang, Nian-Zhong; Sansom, Ivan J. (2016). "The systematics of the Mongolepidida (Chondrichthyes) and the Ordovician origins of the clade". PeerJ 4: e1850. doi:10.7717/peerj.1850. PMID 27350896.
- ↑ "Elestegolepis". https://planetsharkdivers.com/elegestolepis/.
- ↑ "Mongolepis". https://planetsharkdivers.com/mongolepis/.
- ↑ "Polymerolepis". https://planetsharkdivers.com/polymerolepis/.
- ↑ Karatajùtè-Talimaa, Valentina (1995-01-01). "The Mongolepidida: Scale structure and systematic position" (in en). Geobios. Premiers Vertandébrandés et Vertandébrandés Infandérieurs 28: 35–37. doi:10.1016/S0016-6995(95)80083-2. Bibcode: 1995Geobi..28...35K. http://www.sciencedirect.com/science/article/pii/S0016699595800832. Retrieved 2020-08-14.
- ↑ Andreev, Plamen; Zhao, Wenjin; Wang, Nian-Zhong; Meredith Smith, Moya; Li, Qiang; Cui, Xindong; Zhu, Min; Sansom, Ivan (2020-02-13). "Early Silurian chondrichthyans from the Tarim Basin (Xinjiang, China)". PLOS ONE 15 (2): e0228589. doi:10.1371/journal.pone.0228589. PMID 32053606. Bibcode: 2020PLoSO..1528589A.
- ↑ "The Paleobiology Database". https://paleobiodb.org/cgi-bin/bridge.pl?a=checkTaxonInfo&taxon_no=34423&is_real_user=0.
- ↑ "Prehistoric Sharks | Sharkopedia". https://sharkopedia.discovery.com/shark-topics/prehistoric-sharks/#interactive-timeline-of-shark-evolution.
Wikidata ☰ Q104848000 entry
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