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By oilshale
Kingdom: Animalia
Phylum: Chordata
Class: Actinopteri Cope 1871
Order: Semionotiformes Arambourg & Bertin 1958
Family: Macrosemiidae Thiollière 1858
Genus: Legnonotus
Species: Legnonotus krambergeri
Author Citation Bartram, 1977
Eon: Phanerozoic
Era: Mesozoic
Period: Triassic
Sub Period: None
Epoch: Late
International Age: Norian
Argilliti di Riva di Solto Formation
Acquired by: Purchase/Trade
Ponte Giurino
Province of Bergamo
Lombardy region
Italy
Taxonomy from Fossilworks.org.
Genus Diagnosis by Bartram 1977, p.163: " Small macrosemiid fishes, the trunk tapering gradually to form a broad caudal peduncle; skull roof bearing genuine; gape small, the quadrate articulation lying beneath the anterior part of the orbit; dentigerous expansion of maxilla with upper and lower borders straight and diverging posteriorly, hind border also straight and perpendicular to oral border, bearing about 13 small, closely—set teeth; mandible with dentary bearing about 12 closely-set teeth, coronoid teeth rounded; leading edge of preopercular forming sharp angle; abdomina] vertebrae forming thin cylinders, notochord unconstricted; pectoral fin with about 15 rays, leading ray reduced to unpaired splint, no fringing fulcra; pelvic fin formed by five rays preceded by basa] and fringing fulcra; anal fin with seven rays, base compact; caudal fin weakly forked, axial lobe bearing five rays; dorsal fin single and long, preceded by basal and fringing fulcra, outline high anteriorly, convex posteriorly; region immediately on either side of dorsal fin devoid of scales; scales rhomboid."
Species Diagnosis by Bartram 1977, p.164: "Legnonotus with about 25 dorsal fin-rays; dentary teeth tall and sharp."
Line drawing from Bartram 1977, p. 164:
Identified by oilshale using Bartram 1977.
References:
Bartram, A.W.H. (1977) The Macrosemiidae, a Mesozoic family of Holostean fishes. Bulletin of the British Museum of Natural History (Geology), 29, 137-234.
Tintori, A. and Renesto, S. (1983) The Macrosemiidae (Pisces, Actinopterygii) from the Upper Triassic of Lombardy (N. Italy). Rivista Italiana di Paleontologia e Stratigrafia 89(2):209-222.
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