A new species of the mygalomorph spider genus Euagrus Ausserer (Araneae: Euagridae) from central Mexico and new records of E. gus Coyle from Tlaxcala

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  A new species of the mygalomorph spider genus Euagrus Ausserer (Araneae: Euagridae) from central Mexico and new records of E. gus Coyle from Tlaxcala Abstract  A new species of the spider genus Euagrus Ausserer, 1875 from temperate pine-oak forests in the states of Tlaxcala and Hidalgo, Mexico is described: E. pulque sp. nov. The description of the new species is based on male and female adult specimens. Additionally, Euagrus gus Coyle, 1988 is recorded for the very first time in the state of Tlaxcala. These species have sympatric distributions in La Malinche National Park, Tlaxcala. With this description, the diversity of the genus increases to 23 species, with Mexico harboring the highest diversity with 17 described species.  Valdez-Mondragón, A., Salinas-Velasco, H. V. & Bueno-Villegas, J. (2026). A new species of the mygalomorph spider genus Euagrus Ausserer (Araneae: Euagridae) from central Mexico and new records of E. gus Coyle from Tlaxcala. Zootaxa 5810 (...

Morphometric delimitation of Pterinopelma longisternale (Bertani, 2001) and Pterinopelma roseum (Mello-Leitão, 1923) (Mygalomorphae, Theraphosidae)

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Morphometric delimitation of Pterinopelma longisternale (Bertani, 2001) and Pterinopelma roseum (Mello-Leitão, 1923) (Mygalomorphae, Theraphosidae)

ABSTRACT

Delimiting morphological characters for phylogenetic studies in Mygalomorphae taxa can be challenging due to their conservative morphology, often resulting in the establishment of diagnoses with overlapping characters of continuous variation. The Theraphosidae species P. longisternale and P. roseum are considered sister species and the main diagnostic character to distinguish them is the sternum length. We tested the significance of this character in distinguishing these two species using the landmark-based analysis to explore the sternum morphometric variations. Our results showed that sternum shape variations between P. longisternale and P. roseum are continuous and can be differentiated by the width x length ratio, although they are associated with other diagnostical characters, as the size of the branches of the tibial apophysis and the palpal bulb subapical keel.

Moeller, W., Galleti-Lima, A., & Guadanucci, J. P. L. (2024). Morphometric delimitation of Pterinopelma longisternale (Bertani, 2001) and Pterinopelma roseum (Mello-Leitão, 1923) (Mygalomorphae, Theraphosidae). Studies on Neotropical Fauna and Environment, 1–10. https://doi.org/10.1080/01650521.2024.2430077