|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Acanthodii - Ischnacanthiformes - Acritolepidae
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|C. Burrow 2011||?Acritolepid ischnacanthiform acanthodian estimated
at ca. 12 cm long, with normal body scales 0.3-0.7 mm
long and wide with a mostly smooth flat crown bearing 6–12 short subparallel ridges along the anterior edge, formed
of 3–5 superposed growth zones composed of odontocytic
mesodentine, a convex base, and concave neck, each ca.
0.1 mm high; low scales 0.3 mm wide and 0.2 mm long that
have a crown formed of elongate sharp areal growth ridges,
forward of the pectoral region; gradual transition in size
from trunk scales to fin-web scales; long, laterally com-
pressed anterior dorsal fin spine with more than seven
smooth, longitudinal ridges on each side that terminate at the
distal tip or along the trailing edge; anteriormost and poster-
iormost ridges on spine are widest, other ridges narrow, with
all ridges separated by narrow grooves; thin perichondral os-
sification of scapular region of endoskeletal pectoral girdle,
with scapula having a broad shaft that narrows towards its
base; “dentition” cones and small denticles in the branchial,
pharyngeal, or oral region.