Geographical distribution and new records of Ariamnes longissimus keyserling, 1891 (Araneae, Theridiidae) in South America

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  Geographical distribution and new records of Ariamnes longissimus keyserling, 1891 (Araneae, Theridiidae) in South America Abstract Ariamnes longissimus plays a relevant ecological role as a predator, yet its distribution remains underestimated, reflecting knowledge gaps. This study updates its distribution, reports new occurrences, and discusses biogeographic implications. Primary and secondary data (118 records) were compiled, georeferenced, and mapped according to biomes and political divisions. We report the first occurrence in Bahia (Northeast Brazil) and in the Cerrado. The species occurs in Argentina, Peru, and 10 Brazilian states, predominantly in the Atlantic Forest (78%) and Pampas (16%), with additional records in the Amazon and Cerrado. The concentration of records in southern and southeastern Brazil (94%) suggests either sampling bias or historical barriers, whereas its rarity in the Cerrado and absence in the Caatinga/Chaco indicate an association with humid enviro...

On Some Rare Mygalomorph from Ecuador, with the Description of 16 New Species in Five Families (Mygalomorphae: Actinopodidae, Barychelidae, Halonoproctidae, Idiopidae, and Theraphosidae)

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On Some Rare Mygalomorph from Ecuador, with the Description of 16 New Species in Five Families (Mygalomorphae: Actinopodidae, Barychelidae, Halonoproctidae, Idiopidae, and Theraphosidae)

Abstract

This study on Mygalomorphs from Ecuador revealed an amazing unknown diversity, including the first record of the families Actinopodidae and Halonoproctidae. Here, 16 new species and one new genus are described in five families: in Actinopodidae, Actinopus saraguro n. sp. (♀); in Barychelidae, Paracenobiopelma vesca n. sp. (♀), Strophaeus pacificanus n. sp. (♀), S. real n. sp. (♀), S. elongata n. sp. (♂♀), S. josefita n. sp. (♂♀), S. peronii n. sp. (♂♀), S. kaiae n. sp. (♀), S. subterraneus n. sp. (♂), S. spiculum n. sp. (♂), and S. kawsay n. sp. (♀); in Halonoproctidae, Ummidia pupulae n. sp. (♂); in Idiopidae, Idiops clepsydra n. sp. (♀); and in Theraphosidae, Pululahua gen. n., Pululahua kunukyaku gen. n., n. sp. (♂♀), and Pululahua winku gen. n., n. sp. (♂♀); and Thalerommata yasuni n. sp. (♂). Furthermore, images of the type specimens of Actinopus nattereri (Doleschall, 1871) and Actinopus piceus (Ausserer, 1871) are presented. Finally, the synonymy of Idiops fulvipes under Idiops argus is rejected.

Dupérré, N., & Tapia, E. (2025). On Some Rare Mygalomorph from Ecuador, with the Description of 16 New Species in Five Families (Mygalomorphae: Actinopodidae, Barychelidae, Halonoproctidae, Idiopidae, and Theraphosidae). Taxonomy, 5(3), 35. https://doi.org/10.3390/taxonomy5030035