PHYLOGENETIC ANALYSIS OF THE GASTROPOD GENUS CALLIOTROPIS SEGUENZA (VETIGASTROPODA: CALLIOTROPIDAE), INCLUDING FOSSIL AND LIVING SPECIES

DAMIÁN PÉREZ; FERRARI MARIEL; MARTÍN EZCURRA

JOURNAL OF SYSTEMATIC PALAEONTOLOGY

CAMBRIDGE UNIV PRESS

Lugar: Cambridge; Año: 2022

1477-2019

Thetaxonomic content of the genus Calliotropisand systematic position of the fossil species referred to this genus havebeen under debate because of striking resemblance with their extantcounterparts in their general shell morphology and ornament pattern. In arecent contribution, two subgenera of Calliotropiswere preliminarily distinguished and considered to be a result ofecomorphological variation translated to evolutionary changes: shallow-reefecomorphotypes, 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 aquantitative phylogenetic analysis sampling both modern and fossil taxa. Thepresent research aims to revisit comprehensively this systematic scheme after amorphological delimitation of calliotropid lineages. We use a quantitativephylogenetic analysis to shed light on the evolutionary history of this groupof gastropods. Our results indicate that the Mesozoic genus “Calliotropis” is not monophyletic, butliving species comprise a monophyletic group with Pliocene–Recent  distribution. Fossil “Calliotropis” species represent a paraphyletic assemblage composedof different clades: the monophyletic Riselloidea(Cossmann) including only Jurassic species; a Palaeogene group represented bythe new genus Arachnotropis gen. nov.; and a monophyletic Triassic groupthat matches the content of the previously described genus Trochonodus Nützel et al. The genus Ambercyclus Ferrari et al. ismonophyletic and also related to the abovementioned taxa.