PROFILPELAJAR.COM

Boreaspis

Boreaspis
Temporal range: Pragian-Emsian
CGI reconstruction of B. rostrata
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Infraphylum: Agnatha
Class: †Osteostraci
Order: †Benneviaspidida
Family: †Boreaspididae
Genus: †Boreaspis
Stensiö, 1927
Species
  • †B. rostrata Stensiö, 1927 (type)
  • †B. batoides Wangsjö, 1952
  • †B. macrorhynchus Wangsjö, 1952
  • †B. puella Wangsjo, 1952
  • †B. spinicornis Wangsjö, 1952
  • †B. triangularis Wangsjö, 1952
  • †"B." ceratops Wangsjo, 1952
  • †"B." intermedia Wangsjö, 1952

Boreaspis (meaning "Boreas's Shield") is an extinct genus of osteostracan agnathan vertebrate that lived in the Devonian period.

Fourteen different species of Boreaspis have been found in sandstone of the lagoons and estuaries of Devonian Spitsbergen; however, some of these likely do not belong to the genus.[1] The species B. robusta and B. costata have been reassigned to Spatulaspis; and B. circinus, B. curtirostris, and B. gracilis now belong to Dicranaspis.[2]

Species of Boreaspis were very small, with head shields about 2 centimetres (0.79 in) long.[3] All species possessed a long spathe-like rostrum derived from the anterior-most end of the head shield, which would have enhanced the fish's hydrodynamics and was probably also used to root out food buried beneath the substrate.[4]

References

  1. ^ Sansom, R.S. (2009). "Phylogeny, classification and character polarity of the Osteostraci (Vertebrata)". Journal of Systematic Palaeontology. 7 (1): 95–115. doi:10.1017/S1477201908002551.
  2. ^ Groh, S. "Appendix". Patterns of diversification in osteostracan evolution (PDF) (M.S.). Uppsala University.
  3. ^ Frickhinger, Karl Albert (1995). Fossil Atlas: Fishes. Trans. Dr. R.P.S. Jefferies. Blacksburg, Virginia: Tetra Press.
  4. ^ Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 25. ISBN 978-1-84028-152-1.
  • Long, John A. (1996). The Rise of Fishes: 500 Million Years of Evolution. Baltimore: The Johns Hopkins University Press. ISBN 978-0-8018-5438-5.


Stub icon

This article about a prehistoric jawless fish is a stub. You can help Wikipedia by adding missing information.

Content Disclaimer

Informasi ini disarikan dari Wikipedia dan disajikan kembali untuk tujuan edukasi. Konten tersedia di bawah lisensi CC BY-SA 3.0. Kami tidak bertanggung jawab atas ketidakakuratan data yang bersumber dari kontribusi publik tersebut.

  1. The information displayed on this website is sourced in part or in whole from Wikipedia and has been adapted for the purpose of restating it. We strive to provide accurate and relevant information, however:
  2. There is no guarantee of absolute accuracy. Wikipedia is an open, collaborative project that can be edited by anyone, so information is subject to change.
  3. It is not intended to constitute professional advice. The content displayed is for informational and educational purposes only. For important decisions (e.g., medical, legal, or financial), please consult a professional.
  4. Content copyright. Wikipedia is licensed under the Creative Commons Attribution-ShareAlike License (CC BY-SA). This means that content may be reused with appropriate attribution and shared under a similar license.
  5. Responsible use. Any risk arising from the use of information from this website is entirely the responsibility of the user.