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Article: Morphological–phylogenetic analysis of the late Cenozoic Chlamydini von Teppner (Bivalvia, Pectinidae) of southern South America

Papers in Palaeontology - Volume 7 Issue 1 - Cover
Publication: Palaeontology
Volume: 7
Part: 4
Publication Date: November 2021
Page(s): 1825 1846
Author(s): María Belén Santelli, Maximiliano J. Alvarez, and Claudia J. del Río
DOI: 10.1002/spp2.1365
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How to Cite

SANTELLI, M.B., ALVAREZ, M.J., RíO, C.J.D. 2021. . Papers in Palaeontology, 7, 4, 1825-1846. DOI: /doi/10.1002/spp2.1365

Author Information

  • María Belén Santelli - División Paleoinvertebrados Museo Argentino de Ciencias Naturales ‘Bernardino Rivadavia’ CONICET, Av. Ángel Gallardo 470 (C1405DJR) Buenos Aires Argentina
  • Maximiliano J. Alvarez - División Paleoinvertebrados Museo Argentino de Ciencias Naturales ‘Bernardino Rivadavia’ CONICET, Av. Ángel Gallardo 470 (C1405DJR) Buenos Aires Argentina
  • Claudia J. del Río - División Paleoinvertebrados Museo Argentino de Ciencias Naturales ‘Bernardino Rivadavia’ CONICET, Av. Ángel Gallardo 470 (C1405DJR) Buenos Aires Argentina

Publication History

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    Abstract

    The tribe Chlamydini was highly diversified in the marine Neogene of southern South America, reaching its maximum taxonomic diversity during the Miocene. However, the evolutionary relationships of South American taxa remain uncertain. This is the first phylogenetic analysis based on a large morphological matrix on Pectinidae, which focuses on South American taxa and species related to Chlamys s.s. The phylogenetic analysis is based on a matrix composed of 145 shell-characters scored for 48 species, and multiple searches were conducted using equal and implied weighting. Two new monophyletic clades are defined, Multiplicata and Pauciplicata. The first includes DietotenhosenCkaraosippurZygochlamysMoirechlamys (South America), the North-West Pacific Azumapecten, and the North-East Pacific Chlamys hastata. Pauciplicata is represented by Chokekenia (Patagonia, Argentina), Laevichlamys (tropical Atlantic and Indo-Pacific), Semipallium (Indo-Pacific), Swiftopecten (South America and North Pacific), and Jorgechlamys + Reticulochlamys (Patagonia, Argentina). All of these genera are monophyletic except for the paraphyletic Jorgechlamys. The oldest documented occurrence of the tribe is Semipallium foulcheri from the lower Oligocene, a derived taxon that pushes the divergence time of basal genera to the Eocene–Oligocene boundary, generating ghost lineages in all clades, except Jorgechlamys + Reticulochlamys. Pauciplicata and Multiplicata diverge in the early history of the tribe, at the Eocene–Oligocene boundary. Future analyses are necessary to gain a better understanding of the taxonomic arrangement of this poorly understood tribe. Further insights into the relationships of its deepest nodes may well resolve many ghost lineages.

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