Biology:Longodus
| Longodus | |
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| Family: | Longodidae Märss, 2006
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| Genus: | Longodus Märss, 2006
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| Species: | L. acicularis
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| Binomial name | |
| Longodus acicularis Märss, 2006 [1]
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Longodus (Long meaning long and odus meaning tooth) is an extinct genus of thelodont, placed in its own family[1][2] – Longodidae – which existed in what is now Estonia during the Ludlow epoch of the upper Silurian period.[3] The type and only species is Longodus acicularis.[1][3] They are most noted for their long, needle-like scales, which run vertically along their trunk.
Description
Longodus acicularis possessed narrow but elongated scales, approximately 0.5 mm to 1.0 mm in length, with a width to length ratio of up to 1:11. Their heads were almond shaped, connected to a medium trunk and short, distinctly forked tail. Scales contained ridges along the margins, creating a ripple like visual effect. They also possess lateral spines posterior to the crown.[2] The scales on the crown are dentine based, covered by enameloid, while the scales of the base are acellular aspidin based.
References
- ↑ 1.0 1.1 1.2 T. Märss (2006). "Thelodonts (Agnatha) from the basal beds of the Kuressaare Stage, Ludlow, Upper Silurian of Estonia". Proceedings of the Estonian Academy of Sciences, Geology 55 (1): 43–66. doi:10.3176/geol.2006.1.03. http://www.kirj.ee/public/va_ge/geo-2006-1-3.pdf.
- ↑ 2.0 2.1 Mark V. H. Wilson; Tiiu Märss (2009). "Thelodont phylogeny revisited, with inclusion of key scale-based taxa". Estonian Journal of Earth Sciences 58 (4): 297–310. doi:10.3176/earth.2009.4.08. http://www.kirj.ee/public/Estonian_Journal_of_Earth_Sciences/2009/issue_4/earth-2009-4-297-310.pdf.
- ↑ 3.0 3.1 Märss, T., Turner, S.; Karatajūte-Talimaa, V. 2007. "Thelodonti". in H.P. Schultze. Agnatha II. 1B. Verlag Dr. Friedrich Pfeil, München. pp. 143. http://www.pfeil-verlag.de/07pala/abb/3_81d9.pdf.
Wikidata ☰ Q6674192 entry
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