New reticulosan sponges from the middle Cambrian of Sonora, Mexico

9Citations
Citations of this article
10Readers
Mendeley users who have this article in their library.

Abstract

A small assemblage of extremely well-preserved fragments of new sponges has been discovered in calcipelites of the middle Cambrian El Mogallón Formation in the Cerro El Mogallón section, near Arivechi in eastern Sonora, Mexico. The assemblage includes two new reticulosan species referred to Ratcliffespongia arivechensis sp. nov. and Valospongia sonorensis sp. nov., combined with disarticulated remains assigned to Kiwetinokia and additional, currently unidentifiable taxa. The new species represent the first records of these Cambrian genera from Mexico, although they are widely distributed at low latitudes, being previously best known from Utah but extending through Laurentia and South China. This middle Cambrian fauna indicates that there was considerable continuity of the deeper-water hexactinellid sponges between the warm peri-platform of Laurentia and the peri-continental Cambrian platform of Sonora. The new material supports the impression of extremely wide distribution of Cambrian sponge genera, with local diversification at species level within regions, in contrast to much greater generic-level endemism during the Ordovician Period.

Cite

CITATION STYLE

APA

BERESI, M. S., BOTTING, J. P., PALAFOX, J. J., & SÁNCHEZ, B. E. B. (2021). New reticulosan sponges from the middle Cambrian of Sonora, Mexico. Acta Palaeontologica Polonica, 62(4), 691–703. https://doi.org/10.4202/app.00378.2017

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free