Venom Variation as a Window into the Ecology and Evolution of Snakes

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  Venom Variation as a Window into the Ecology and Evolution of Snakes Abstract Snake venoms are complex biochemical systems that function primarily in prey subjugation and defense, yet their composition varies extensively across individuals, populations, species, and environments. This variation provides a powerful framework for investigating ecological and evolutionary processes. Here, we offer a forward-looking synthesis of snake venom diversity that proposes new research directions and highlights how venom variation can illuminate eco-evolutionary dynamics across biological scales. We review evidence for ten key contexts in which venom variation arises, including within-population differences, sexual dimorphism, geographic structuring, ontogenetic shifts, seasonal changes, interspecific divergence, hybridization, convergent evolution, prey specificity, and venom resistance. Together, these processes demonstrate that venom phenotypes are shaped by interacting selective pressures...

A web of canopy discoveries part I (Araneae: Araneidae). New astonishing species of orb-weaving spiders from Ecuador and the first country record of Pozonia Schenkel, 1953

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A web of canopy discoveries part I (Araneae: Araneidae). New astonishing species of orb-weaving spiders from Ecuador and the first country record of Pozonia Schenkel, 1953

Abstract

Two new species from the family Araneidae are described: a new species from the monotypic orb-weaving genus Spinepeira Levi, 1995, Spinepeira erwini sp. nov. (♀), and a new species of Scoloderus Simon, 1887, Scoloderus neilli sp. nov. (♀), are described from the Ecuadorian Amazon. Both species were collected with insecticidal canopy knockdown. Furthermore, herein, we present the first images of Spinepeira’s internal genitalia, and the first country record of Pozonia Schenkel, 1953 is reported with Pozonia bacillifera (Simon, 1897) collected in the canopy of Tiputini in Ecuador.

Díaz-Guevara, D.R. & Dupérré, N. (2025) A web of canopy discoveries part I (Araneae: Araneidae). New astonishing species of orb-weaving spiders from Ecuador and the first country record of Pozonia Schenkel, 1953. Zootaxa, 5660 (4), 587–595. https://doi.org/10.11646/zootaxa.5660.4.9