Kyphosichthys

Kyphosichthys Temporal range: Middle Triassic, Anisian PreꞒ Ꞓ O S D C P T J K Pg N

Holotype skeleton of K. grandei
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Clade:	Ginglymodi
Order:	†Kyphosichthyiformes
Family:	†Kyphosichthyidae
Genus:	†Kyphosichthys Xu & Wu, 2011
Species:	†K. grandei
Binomial name
†Kyphosichthys grandei Xu & Wu, 2011

Kyphosichthys is an extinct genus of basal actinopterygian bony fish known from the lower Middle Triassic (Anisian) marine deposits (Guanling Formation) in Luoping, eastern Yunnan Province, southwestern China.^[1] The species is the first known fossil record of highly deep-bodied ginglymodians.

Description

Kyphosichthys (Greek for "bent fish") has a strongly arched hump between the head and the dorsal fin, from which its name derives. The holotype measures 96 mm in total length, and 76 mm in standard length. The greatest body height occurs at the posterior opercular margin, where the body height is over 70% of the standard length. The dorsal fin and anal fin are located far back on the body, the latter is only half as long as the dorsal fin. The pelvic fins are much smaller than the pectoral fins. The forked caudal fin is hemi-heterocercal due to a heavy lobe extending into the dorsal lobe of the fin, but outwardly is nearly symmetrical. The body is covered in ganoid scales; those of the anterior flank are decorated with ornate ridges and tubercles while the scales further back are smoother.^[1]

In describing Kyphosichthys, Xu and Wu compared its body form to modern day deep-bodied fish such as the boarfish and butterflyfish (Chaetodon sp.), and inferred that Kyphosichthys was similarly a slow swimmer but highly maneuverable, likely adapted to structurally complex habitats.^[1]

Classification

When it was first described, Kyphosichthys was assigned as incertae sedis within Ginglymodi, a group of Holostean fish which includes the living gars as well as extinct species. A phylogenetic analysis of Kyphosichthys and other Mesozoic neopterygians placed Kyphosichthys in an unresolved polytomy with Lepisosteus (living gars) and the extinct Semionotus.^[1]

Neopterygii

Teleostei

	Leptolepis

	Pholidophorus

Dapedium

Holostei

Halecomorphi

	Amia

	Watsonulus

Ginglymodi

	Lepisosteus

	Semionotus

	Kyphosichthys

	Acipenser

	Birgeria

References

^ ^a ^b ^c ^d Xu, G. -H.; F.- X., Wu. (2011). "A deep-bodied ginglymodian fish from the Middle Triassic of eastern Yunnan Province, China, and the phylogeny of lower neopterygians". Chinese Science Bulletin. 57: 111–118. doi:10.1007/s11434-011-4719-1.

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