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<p>A recent revision resulted in the description or resurrection from synonymy of 19 species of <i>Astyanax</i> from Panama to Texas, most of them formerly identified as <i>A. aeneus</i>. The review was based mostly on osteology, informed by previous genetic studies. Although traditional morphometrics and meristics were included in the diagnoses, extensive overlap among species in most traits makes identification very difficult without dissection. This study applies geometric morphometrics to discriminate similarly-shaped sympatric or neighboring species of <i>Astyanax</i> in seven geographical areas: (1) Northern Mexico and Texas; (2) West-Central Mexico; (3) Southern Mexico to El Salvador; (4) Yucatan Peninsula; (5) Mexican Caribbean versant to Honduras; (6) the Verapaces of Guatemala; (7) Nicaragua to Panama. The results show that most species that occur within a given region or in adjacent regions are indeed discernible morphologically without need for dissection or molecular analysis. This finding supports the new taxonomy of the genus in Mesoamerica.</p>

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Geometric morphometrics can discriminate recently described Mesoamerican species of Astyanax (Characiformes: Acestrorhamphidae)

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Juan J. Schmitter-Soto

摘要

A recent revision resulted in the description or resurrection from synonymy of 19 species of Astyanax from Panama to Texas, most of them formerly identified as A. aeneus. The review was based mostly on osteology, informed by previous genetic studies. Although traditional morphometrics and meristics were included in the diagnoses, extensive overlap among species in most traits makes identification very difficult without dissection. This study applies geometric morphometrics to discriminate similarly-shaped sympatric or neighboring species of Astyanax in seven geographical areas: (1) Northern Mexico and Texas; (2) West-Central Mexico; (3) Southern Mexico to El Salvador; (4) Yucatan Peninsula; (5) Mexican Caribbean versant to Honduras; (6) the Verapaces of Guatemala; (7) Nicaragua to Panama. The results show that most species that occur within a given region or in adjacent regions are indeed discernible morphologically without need for dissection or molecular analysis. This finding supports the new taxonomy of the genus in Mesoamerica.