Tchunacanthus, Karatajute-Talimaa & Smith, 2003
publication ID |
https://doi.org/ 10.5281/zenodo.13620888 |
persistent identifier |
https://treatment.plazi.org/id/0D32E506-FFF6-FFEA-FCF8-6461FBE470D7 |
treatment provided by |
Felipe |
scientific name |
Tchunacanthus |
status |
|
Genus Tchunacanthus Karatajūtė− Talimaa and
Smith, 2003 Type and only species: Tchunacanthus obruchevi Karatajūtė− Talimaa and Smith, 2003; Siberia, Irkutsk amphitheatre, Tchuna River, Staroe Balturino outcrop; Lower Silurian , Upper Llandovery , Upper Balturino Subformation .
Diagnosis.—Squamation comprising head, transitional and body scales, and larger tesserae with complicated sculptured crowns and with multilobate outlines; head scales have smooth crowns with concentric growth lines; transitional body scales have crowns folded into longitudinal ridges, formed of separate tubercles; head and transitional scales have deep bases, with funnel−shaped or oblong furrows in centre and surrounding convex bosses subdivided by narrower furrows; base of body scales smaller than crown, diamond−shaped, convex; areal growth characterizes head and transitional scales; body scales have either areal−superpositional or only superpositional growth; canal system absent; crown of cellular mesodentine, with regular, rounded cell spaces, in the inner part of each dentine layer; base contains simple, small, fusiform cell spaces without processes, disposed parallel to distinct growth lines comprising very thin first order, and second−order lines.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.