Longodus

Longodus
Temporal range: Ludlow epoch
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Infraphylum: Agnatha
Class: †Thelodonti
Order: †Thelodontiformes
Family: †Longodidae
Märss, 2006
Genus: †Longodus
Märss, 2006
Species:
†L. acicularis
Binomial name
†Longodus acicularis
Märss, 2006 [1]

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. ^ a b c T. Märss (2006). "Thelodonts (Agnatha) from the basal beds of the Kuressaare Stage, Ludlow, Upper Silurian of Estonia" (PDF). Proceedings of the Estonian Academy of Sciences, Geology. 55 (1): 43–66. doi:10.3176/geol.2006.1.03. S2CID 199522655.
  2. ^ a b Mark V. H. Wilson & Tiiu Märss (2009). "Thelodont phylogeny revisited, with inclusion of key scale-based taxa" (PDF). Estonian Journal of Earth Sciences. 58 (4): 297–310. doi:10.3176/earth.2009.4.08.
  3. ^ a b Märss, T., Turner, S. & Karatajūte-Talimaa, V. 2007. "Thelodonti". In H.P. Schultze (ed.). Agnatha II (PDF). Vol. 1B. München: Verlag Dr. Friedrich Pfeil. p. 143.{{cite book}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link)


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