Lenacanthus, Karatajute-Talimaa & Smith, 2003

Valiukevičius, Juozas & Burrow, Carole J., 2005, Diversity of tissues in acanthodians with Nostolepis-type histological structure, Acta Palaeontologica Polonica 50 (3), pp. 635-649 : 646

Genus Lenacanthus Karatajūtė− Talimaa and Smith, 2003

Type and only species: Lenacanthus priscus Karatajūtė− Talimaa and Smith, 2003; South Yakutia, Niuya River outcrops and Irkutsk amphitheatre; Llandovery , Lower Silurian .

Diagnosis.—Head scales irregular, polygonal, seldom hexagonal, and rounded, with flat, or gently convex, smooth crown; edges of crown with relativly deep hollows and notches; neck feebly demarcated; base low, relatively flat but slightly convex. Transitional scales irregular, broad and short; anterior crown subdivided into two, four or seven sections. Body scales with base smaller than crown, low, polygonal or oval/diamond−shaped, with crown extended backwards to point; crown anteriorly subdivided into 3–5 sections by deep, longitudinal fissures. Areal (head), areal−superpositional (transitional) and superpositional (body) scale growth; crown of cellular mesodentine with distinct lacunae and very thin, branched tubules; base with simple cells, lacunae without branching canaliculi; system of vascular canals absent.