Asialepidotus shingyiensis Su, 1959

By oilshale

• September 13, 2021

Taxonomy

Kingdom: Animalia
Phylum: Chordata Haeckel 1874
Class: Actinopteri Cope 1871
Order: Ionoscopiformes Grande and Bemis 1998
Family: Incertae sedis
Genus: Asialepidotus
Species: Asialepidotus shingyiensis
Author Citation Su, 1959

Geological Time Scale

Eon: Phanerozoic
Era: Mesozoic
Period: Triassic
Sub Period: None
Epoch: Middle
International Age: Anisian (Pelsonian)

Stratigraphy

Falang Formation

Provenance

Acquired by: Purchase/Trade

Dimensions

Length: 24 cm

Location

Dingxiao Town
Qianxinan Buyei and Miao Autonomous Prefecture
Guizhou Province
China

• anisian
• asialepidotus
• dingxiao
• falang formation
• guizhou
• shingyiensis
• tff-oilshale-ch919
• triassic

Comments

Taxonomy according to Xu and Ma, 2018

Junior synonym: Guizhoueugnathus analilepida Liu et al., 2003. Preoccupied name: Guizhouella analilepida Liu et al., 2013.

Quote from Xu and Ma (2017, p. 36): “Based on three nearly complete fish specimens …, Liu et al. (2003) named Guizhouella analilepida and referred it to the family Eugnathidae (= Caturidae, Amiiformes); this genus was later renamed as Guizhoueugnathus, because it was preoccupied by a brachiopod genus (Liu, 2004). Jin (2009) first noticed that G. analilepida was a junior synonym of A. shingyiensis, and suggested that this taxon was closely related to parasemionotiforms.

Quote from Xu and Ma (2018, pp. 97-98): ”Emended diagnosis: A large-sized ionoscopiform distinguished from other members of this order by the following combination of features: frontal nearly three times as long as parietal; parietal rectangular, slightly longer than wide; supraorbital sensory canal contacting anterior pitline in parietal; dermopterotic 1.3–1.4 times as long as parietal; three (two, occasionally) pairs of extrascapulars; two supraorbitals; dermosphenotic with canal-bearing innerorbital flange; five infraorbitals; two suborbitals; quadratojugal splint-like; supramaxilla single, nearly half of length of maxilla; maxilla with branch of infraorbital sensory canal; maxilla ending at level of posterior margin of orbit; 14 pairs of branchiostegal rays; median gular large and nearly triangular; 15 rays in each pectoral fin; 10–11 principal dorsal rays; 11–12 principal anal rays; 21–23 principal caudal rays; rhomboidal scales with serrated posterior margin; and scale formula of D25–26/P11–13, A22–24, C37–40/T43–45.”

Line drawing from Xu and Ma, 2018, p. 100:

Identified by oilshale using Xu and Ma, 2017.

References:

Su, D.-Z. 1959. Triassic fishes from Kueichow, Southwest China. Vertebrata PalAsiatica 3, 205–210.

Liu, G. -B., Yin, G. -Z., Wang, X. -H., Luo, Y. -M. and Wang, S. -Y. 2003. New discovered fishes from Keichousaurus bearing horizon of Late Triassic in Xingyi of Guizhou. Acta Palaeontologica Sinica 42, 346–366.

Liu, G. -B. 2004. Change names: Guizhoueugnathus, new name for Guizhouella Liu, 2003 and Guizhoubrachysomus, new name for Brachysomus Liu, 2003. Acta Palaeontologica Sinica 43, 447.

Jin, F. 2009. Fishes. In: Li, J. -L. and Jin, F. (Eds.), Swim in the ocean two hundred million years ago. Ocean Press, Beijing. pp. 99–121.

Xu, G. H. and Ma, X. Y.  (2017): Taxonomic revision of Asialepidotus shingyiensis Su, 1959 (Halecomorphi, Holostei) from the Middle Triassic (Ladinian) of Guizhou and Yunnan, China. Research & Knowledge 3:36-38 

Xu, G. H. and Ma, X. Y. (2018): Redescription and phylogenetic reassessment of Asialepidotus shingyiensis (Holostei: Halecomorphi) from the Middle Triassic (Ladinian) of China. The Linnean Society of London, Zoological Journal of the Linnean Society, 184, 95–114.