Gymnoichthys inopinatus Tintori et al, 2010

Taxonomy

Kingdom: Animalia
Phylum: Chordata
Class: Actinopteri Cope 1871
Order: Amiiformes Hay 1929
Family: Incertae sedis
Genus: Gymnoichthys
Species: Gymnoichthys inopinatus
Author Citation Tintori et al., 2010

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: 10 cm

Location

Daaozi, Luoxiong
Luoping County
Yunnan
China

• gymnoichthys
• luoping
• tff-oilshale-ch1487
• triassic
• yunnan

Comments

Taxonomy from Mindat.org.

Diagnosis for the species by Tintori et al. 2010, p. 164:  "Medium size, almost naked basal neopterygians with high fusiform body. Postero-ventral infraorbital much larger than the others; no suborbitals. Ventral surface of the parasphenoid and median surface of palatal bones totally covered by small teeth. Skull dermal bones with a ridged external surface, but with scarce ganoine covering. Vertebral column with no ossified or calcified centra. Autogeneous neural spines showing an enlarged leaf-like proximal end articulated to the corresponding enlarged distal area of paired neural arches. Short neural arches fused to the neural spines beginning from the end of the dorsal fin. Ossified ribs present, followed by haemal arches with a median spine at level of the insertion of the anal fin, Squamation constituted only by very small scales, arranged in a discontinuous row along the lateral line and in a single urodermal row on the dorsal body lobe of the hemiheterocercal tail. Last radial in  both dorsal and anal fins supporting the last two or three lepidotricha. Median fins with very small scutes, several basal fulcra, very few and thin fringing fulcra. Size to at least 105 mm (S.L.); about 44 vertebral segments comprising the ural ones. All fins large and made by rather elongate lepidotrichia. Pectoral and pelvic fins made respectively by 13 and 8 lepidotrichia, dorsal and anal fin by 19 and 14 lepidotrichia. Caudal fin with 10 dorsal caudal fulcra, 3 dorsal unbranched, 17 segmented and branched, 3 ventral unbranched (at least two of them bearing few tiny fringing fulcra), 2-3 ventral caudal fulcra and 1-2 ventral scute. Dorsal body lobe with a single row of 12-13 urodermals, Cleithrum and postcleithrum ornamented by very low ridges with a dendritic pattern posteriorly directed."

Line drawing from Tan & Jin 2013, p. 51:

References:

Tintori, A. et al. (2010): A NEW BASAL NEOPTERYGIAN FROM THE MIDDLE TRIASSIC OF LUOPING COUNTY (SOUTH CHINA). Rivista Italiana di Paleontologia Stratigrafia 2010, Vol. 116, No. 2, pp 162-171.
Tan, K. und Jin, F. (2013): Re-study on Gymnoichthys inopinatus from Middle Triassic of Luoping, Yunnan, China. Vertebrata Palasiatica 2013, pp 1-8.