Luoxiongichthys hyperdorsalis Wen et al., 2011

Taxonomy

Kingdom: Animalia
Phylum: Chordata
Class: Actinopteri Cope 1871
Order: Kyphosichthyiformes Sun and Ni 201
Family: Kyphosichthyidae Sun and Ni 2017
Genus: Luoxiongichthys
Species: Luoxiongichthys hyperdorsalis
Author Citation Wen et al., 2011

Geological Time Scale

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

Stratigraphy

Guanling Formation
Member II

Biostratigraphy

Nicoraella kockeli Zone

Provenance

Acquired by: Purchase/Trade

Dimensions

Length: 15 cm

Location

Daaozi, Luoxiong
Luoping County
Yunnan
China

• china
• luoping
• luoxiongichthys
• triassic
• yunnan

Comments

Taxonomy from Fossilworks.org.

Diagnosis from Wen et al. 2012. p. 152: "Middle−sized fishes, laterally compressed. The outline is triangular, with the apex of the triangle formed by a pointed “hump” in the dorsal region. Opercular series com− prising opercle, subopercle, interopercle, and preopercle; subopercular has long ramus anterior to opercular; suboper− cular a little less than half the size of the opercular; preopercular almost vertically oriented, with slender dorsal limb; three square−like suborbitals; at least eight branchiostegal rays with tubercles on the surface and comb−like ornament on their anterior margin; strong lower jaw has coronoid pro− cess; pointed grasping teeth in upper jaw, lower jaw, para− sphenoid and entopterygoid; articulation of jaw immediately below posterior margin of orbit; cleithrum is strong, with ridge ornament on surface of upper part; supracleithrum is large, nearly half the depth of the cleithrum, the lower end is somewhat pointed; two postcleithra lie behind the cleithrum; clavicle present; hemiheterocercal tail slightly forked; each radial supports one lepidotrichium in unpaired fins; all rays segmented from middle part and bifurcated distally; fringing fulcra on anterior margin of all fins; enlarged fulcra before anal fin and caudal fin; the whole body is covered with ganoid scales with tuberculate ornament; scales contact each other by peg−and−socket structure."

Line drawing by Wen et al., p. 152:

Identified by oilshale using Wen et al. 2002.

References:

W. Wen, Q. Y. Zhang, C. Y. Zhou, J. Y. Huang, Z. Q. Chen and M. J. Benton. (2012) A new genus of basal actinopterygian fish from the Anisian (Middle Triassic) of Luoping, Yunnan Province, Southwest China. Acta Palaeontologica Polonica 57:149-160.

Sun, Z. Y. and Ni, P. G.  (2017) Revision of Kyphosichthys grandei Xu & Wu, 2012 from the Middle Triassic of Yunnan Province, South China: implications for phylogenetic interrelationships of ginglymodian fishes. Journal of Systematic Palaeontology 16:67-85.