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<p>The genus <i>Eutatus</i> (Chlamyphoridae, Euphractinae, Eutatini) includes two species, <i>Eutatus pascuali</i> (Late Pliocene–Middle Pleistocene) and <i>Eutatus seguini</i> (Middle Pleistocene–Early Holocene), to which is added a third species (<i>Eutatus crispianii</i>, Late Pleistocene) recognized through a single record. Here, we present a new exceptionally preserved specimen (MG-G-Pv0035) assigned to <i>E. seguini</i>, recovered from Late Pleistocene deposits outcropping at Laguna Melincué area (southern Santa Fe Province, Argentina). It includes a mostly complete skull preserving the cephalic shield, a partial dorsal carapace, caudal armor and two caudal vertebrae. This specimen is of particular interest for preserving almost the totality of the caudal armor, a previously unknown structure for the genus. Moreover, this material represents the most complete caudal armor preserved for an Eutatini armadillo, and the morphology of this structure clearly differs from that of the other major clades of armadillos. Since the caudal armor represents a structure with high diagnostic value in Cingulata, its description and characterization has a great scientific value since it represents a potential apomorphic character of the tribe.</p> Graphical abstract <p></p>

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An exceptional specimen of Eutatus seguini Gervais, 1867 (Xenarthra Cingulata) and new insights on the caudal armor variation in armadillos

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Daniel Barasoain,
  • Carlos A. Luna,
  • Raúl I. Vezzosi,
  • Alfredo E. Zurita,
  • Germán Giordano Porati,
  • Juan D. Avila,
  • Mariela Gallego,
  • Fernán García,
  • Belén Molinengo

摘要

The genus Eutatus (Chlamyphoridae, Euphractinae, Eutatini) includes two species, Eutatus pascuali (Late Pliocene–Middle Pleistocene) and Eutatus seguini (Middle Pleistocene–Early Holocene), to which is added a third species (Eutatus crispianii, Late Pleistocene) recognized through a single record. Here, we present a new exceptionally preserved specimen (MG-G-Pv0035) assigned to E. seguini, recovered from Late Pleistocene deposits outcropping at Laguna Melincué area (southern Santa Fe Province, Argentina). It includes a mostly complete skull preserving the cephalic shield, a partial dorsal carapace, caudal armor and two caudal vertebrae. This specimen is of particular interest for preserving almost the totality of the caudal armor, a previously unknown structure for the genus. Moreover, this material represents the most complete caudal armor preserved for an Eutatini armadillo, and the morphology of this structure clearly differs from that of the other major clades of armadillos. Since the caudal armor represents a structure with high diagnostic value in Cingulata, its description and characterization has a great scientific value since it represents a potential apomorphic character of the tribe.

Graphical abstract