Venom composition of the Iberian adder (Vipera seoanei) from northern Portugal reveals limited sex and size variation

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  Venom composition of the Iberian adder (Vipera seoanei) from northern Portugal reveals limited sex and size variation Abstract Snake venom is a complex and dynamic ecological trait, with high potential for intraspecific variation. In this study, the venom composition of the Iberian adder ( Vipera seoanei ) from the Peneda Mountains of northern Portugal was investigated to explore whether venom varies with body size and sex. Venom proteomes from six individuals representing juvenile, subadult, and adult males and females were characterised using LC–MS/MS, while individual variation was assessed from SDS–PAGE profiles of 18 snakes. LC–MS/MS identified 144 proteins, dominated by phospholipases A 2 (PLA 2 ), snake venom serine proteases (svSP), and C-type lectin-related proteins (CTL). Descriptive comparisons revealed contrasting individual profiles, particularly between the juvenile male, characterised by high svSP and svMP abundance, and the juvenile female, characterised by high ...

On a new genus of dwarf tarantulas (Araneae: Mygalomorphae: Theraphosidae) endemic from Peru: evidence from morphology and molecular phylogeny, with description of three new species

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On a new genus of dwarf tarantulas (Araneae: Mygalomorphae: Theraphosidae) endemic from Peru: evidence from morphology and molecular phylogeny, with description of three new species

Abstract

Recent field campaigns conducted in Peru along with the examination of museum specimens allowed us to identify small tarantulas that do not fit with any known Theraphosidae genera. Morphology and additional molecular evidence from the mitochondrial gene COI led us to propose Kiskalla gen. nov. from southern Peru, at Puno region. Three new species of Kiskalla gen. nov. (K. ignacioi sp. nov., K. yeisoni sp. nov. and K. zukuapasanka sp. nov.) are herein described, diagnosed and illustrated. Kiskalla gen. nov. differs from the known Theraphosinae genera in the presence of lateral stripes on the abdomen and a small dorsal arrowhead-shaped patch of type III urticating setae, presence of a large number of spines on all legs, short and stout setae on the dorsal metatarsi encircling the filiform trichobothria, an apical crown of long spines on the metatarsi of all legs in both sexes and scopula of tarsi IV slightly developed, restricted to the margins due to the presence of long ventral setae. Males and females show genitalic features that resemble those of Hapalotremus Simon, 1903, but differ by the development of copulatory bulb keels and the aspect of the spermathecae. We also present data on the natural history and distribution of the species.

Quispe-Colca OM, Ferretti NE, Chaparro JC, Ochoa JA, West RC (2026) On a new genus of dwarf tarantulas (Araneae: Mygalomorphae: Theraphosidae) endemic from Peru: evidence from morphology and molecular phylogeny, with description of three new species. Arthropod Systematics & Phylogeny 84: 371-392. https://doi.org/10.3897/asp.84.e181294