Triassospathodus aff. symmetricus ( Orchard, 1995 )

Leu, Marc, Bucher, Hugo, Vennemann, Torsten, Bagherpour, Borhan, Ji, Cheng, Brosse, Morgane & Goudemand, Nicolas, 2022, A Unitary Association-based conodont biozonation of the Smithian-Spathian boundary (Early Triassic) and associated biotic crisis from South China, Swiss Journal of Palaeontology (19) 141 (1), pp. 1-61 : 41

publication ID

https://doi.org/ 10.1186/s13358-022-00259-x

DOI

https://doi.org/10.5281/zenodo.13127749

persistent identifier

https://treatment.plazi.org/id/038B1D1D-6441-FF99-FF1B-EDFBD2D5FBA7

treatment provided by

Felipe

scientific name

Triassospathodus aff. symmetricus ( Orchard, 1995 )
status

 

Triassospathodus aff. symmetricus ( Orchard, 1995)

Figs. 18G View Fig ; 24B, E, F View Fig

2004 Neospathodus sp. aff. N. symmetricus Orchard ; Koike, p. 133, figs. 2.4–2.5.

2015 Triassospathodus symmetricus (Orchard) ; Chen et al., fig. 8.1.

Number of specimens.> 20.

Remarks. Te biostratigraphical range of these specimens is usually slightly older than that of Tr. symmetricus . Te P 1 element of Tr. aff. symmetricus resembles that of Tr. symmetricus , but is shorter with fewer denticles and a more circular and larger outline of the basal cavity. Te denticles are less inclined posteriorly compared to Tr. symmetricus and often have one additional small posteriormost denticle. Its denticles are not posteriorly arched as in Nv. pingdingshanensis . It differs from the very similar Nv. abruptus by having a downturned posterior part and posteriorly reclined denticles. Tis species might represent a transitional form between Novispathodus abruptus and Triassospathodus symmetricus but a multi-element apparatus reconstruction is currently lacking.

Occurrence. Taho Formation, Southwest Japan, Spathian age (Koike, 2004); South China, Luolou Formation, at the top of the black shales and the base of the nodular limestone in the earliest Spathian (this study).

GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF