2022/08/24 by Damián E. Pérez, Mariel Ferrari, Martín D. Ezcurra · 1 citation
Earth and Planetary Sciences · Agricultural and Biological Sciences · #Marine Biology and Ecology Research #Paleontology and Stratigraphy of Fossils #Mollusks and Parasites Studies
paper · doi:10.1080/14772019.2022.2100288
openalex publication_date 2022/08/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29
The taxonomic content of the genus Calliotropis and the systematic positions of the fossil species referred to this genus have been under debate because of the striking resemblance they bear to their extant counterparts in terms of general shell morphology and ornament pattern. In a recent contribution, two subgenera of Calliotropis were preliminarily distinguished and considered to be a result of ecomorphological variation translated into evolutionary changes: shallow-reef ecomorphotypes, representing the fossil species of Calliotropis (Riselloidea), and deep-water ecomorphotypes, grouping the living forms of Calliotropis (Calliotropis). However, this division of Calliotropis species was based on qualitative grounds, lacking a quantitative phylogenetic analysis sampling both modern and fossil taxa. The present research aims to comprehensively revisit this systematic scheme after a morphological delimitation of calliotropid lineages. We use a quantitative phylogenetic analysis to shed light on the evolutionary history of this group of gastropods. Our results indicate that the Mesozoic genus ‘Calliotropis’ is not monophyletic, but living species comprise a monophyletic group with a Pliocene–Recent distribution. Fossil ‘Calliotropis’ species represent a paraphyletic assemblage composed of different clades: the monophyletic Riselloidea (Cossmann) including only Jurassic species; a Palaeogene group represented by the new genus Arachnotropis gen. nov.; and a monophyletic Triassic group that matches the content of the previously described genus Trochonodus Nützel et al., 2003 Nützel, A., Hamedani, A., Senowbari-Daryan, E. & Senowbari- Daryan, B. 2003. Some Late Triassic gastropods from the Nayband Formation in Central Iran. Facies, 48, 127–134.[Crossref], [Web of Science ®] , [Google Scholar]. The genus Ambercyclus Ferrari et al., 2014 Ferrari, S. M., Kaim, A. & Damborenea, S. 2014. The genera Calliotropis Seguenza and Ambercyclus n. gen. (Vetigastropoda, Eucyclidae) from the Early Jurassic of Argentina. Journal of Paleontology, 88, 1174–1188.[Crossref], [Web of Science ®] , [Google Scholar] is monophyletic and also related to the above-mentioned taxa.http://zoobank.org/urn:lsid:zoobank.org:pub:0BF29053-3D67-41A4-923D-5621D448AD61