Longodus

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.

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.

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Thelodonti

• Kingdom: Animalia
• Phylum: Chordata
• Subphylum: Vertebrata

Thelodonti

Oeselia Skamolepis Sophialepis Thulolepis Archipelepidiformes Archipelepis Boothialepis Furcacaudiformes Barlowodus Drepanolepis Pezopallichthys Nikoliviidae Chattertonodus Nikolivia Lanarkiidae Lanarkia Phillipsilepis Apalolepididae Apalolepis Gampsolepis Furcacaudidae Canonia Cometicercus Furcacauda Sphenonectris Thelodontiformes Helenolepis Longodus Talivaliidae Amaltheolepis Glacialepis Talivalia Turiniidae Arianalepis Australolepis Boreania Jesslepis Neoturinia Turinia Coelolepidae Parathelodus Thelodus Loganelliidae Angaralepis Illoganellia Larolepis Loganellia Nunavutia Sandivia Stroinolepis Talimaalepis Valyalepis Phlebolepididae Erepsilepis Phlebolepis Shieliidae Eestilepis Goniporus Nethertonodus Niurolepis Overia Paralogania Praetrilogania Shielia Trimerolepis Valiukia Zuegelepis

This article about a prehistoric jawless fish is a stub. You can help Wikipedia by expanding it.

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This article related to a Silurian animal is a stub. You can help Wikipedia by expanding it.

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