Osteocallis infestans Paes Neto et al., 2016

Cunha, Lucca S., Dentzien-Dias, Paula & Francischini, Heitor, 2024, New bioerosion traces in rhynchosaur bones from the Upper Triassic of Brazil and the oldest occurrence of the ichnogenera Osteocallis and Amphifaoichnus, Acta Palaeontologica Polonica 69 (1), pp. 1-21 : 10

publication ID	https://doi.org/ 10.4202/app.01093.2023
DOI	https://doi.org/10.5281/zenodo.10999094
persistent identifier	https://treatment.plazi.org/id/A253B73D-FFF4-4948-5A00-FF5EFE26FBEE
treatment provided by	Felipe
scientific name	Osteocallis infestans Paes Neto et al., 2016
status

Treatment

Fig. 4C View Fig .

Diagnosis.—Shallow to moderately deep, meandering trail of generally straight overlapping thick grooves excavated into the cortical bone surfaces. Grooves are randomly orientated, often overlapping other grooves which are either perpendicular or parallel to one another. The intensity of the grooves culminates in an irregular furrow-like morphology for the trail.

Material.—UFRGS-PV-1581- T #12 ( Fig. 4C View Fig ), a bone fragment referred to Hyperodapedon mariensis from Buriol Site, São João do Polêsine municipality, Rio Grande do Sul State, Brazil; Base of the Candelária Sequence (vertebrate remains associated to the lower subunit of the Hyperodapedon AZ ), SMS, Paraná Basin; middle Carnian (lower Upper Triassic).

Description.—Two overlapping, moderately deep trails formed by randomly oriented, overlapping grooves culminating in a furrow-like morphology. Isolated grooves outside of the furrow appear to be arcuate, but the intense overlapping prevents the precise observation of groove morphology. The length of the trails ranges from 8.37–14.38 mm and the width ranges from 0.33–1.47 mm.

Remarks.—Both trails described here are considerably narrower than the holotype of O. infestans (which came from the Exaeretodon sub-AZ of the Hyperodapedon AZ ) and the grooves are not as thick. As in the holotype, some areas outside of the furrow present isolated grooves. The furrow-like morphology is readily distinguishable from what is seen in O. mandibulus ( Fig. 4C View Fig ).