A new Cataleptoneta species (Araneae, Leptonetidae) from sulfidic caves in Greece and Albania

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  A new Cataleptoneta species (Araneae, Leptonetidae) from sulfidic caves in Greece and Albania Abstract A new species of the genus Cataleptoneta Denis, 1955, Cataleptoneta sulfur sp. nov ., is described from caves in the Vromoner Canyon (Sarandaporo River Valley), on the Greek–Albanian border (northwestern Greece and southern Albania), on the basis of both sexes. Drawings, scanning electron micrographs, and digital images of diagnostic features are presented. Analysis of COI mitochondrial barcode sequences confirmed the species distinction from all the other sequences. Within the species two separate lineages, unique to each cave were found. The genus Cataleptoneta is not monophyletic as now circumscribed and confirmed also by the phylogenetic analysis of the sequences. Urák I, Ştefan A, Motoc RM, Brad T, Zsigmond A-R, Sarbu SM, Szűts T (2026) A new Cataleptoneta species (Araneae, Leptonetidae) from sulfidic caves in Greece and Albania. ZooKeys 1294: 89-107. https://doi.org/...

Batesian Mimicry Converges Towards Inaccuracy in Myrmecomorphic Spiders

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Batesian Mimicry Converges Towards Inaccuracy in Myrmecomorphic Spiders

Abstract

Batesian mimicry is an impressive example of convergent evolution driven by predation. However, the observation that many mimics only superficially resemble their models despite strong selective pressures is an apparent paradox. Here, we tested the ‘perfecting hypothesis’, that posits that inaccurate mimicry may represent a transitional stage at the macro-evolutionary scale by performing the hereto largest phylogenetic analysis (in terms of the number of taxa and genetic data) of ant-mimicking spiders across two speciose but independent clades, the jumping spider tribe Myrmarachnini (Salticidae) and the sac spider sub-family Castianeirinae (Corinnidae). We found that accurate ant mimicry evolved in a gradual process in both clades, by an integration of compound traits contributing to the ant-like habitus with each trait evolving at different speeds. Accurate states were highly unstable at the macro-evolutionary scale likely because strong expression of some of these traits comes with high fitness costs. Instead, the inferred global optimum of mimicry expression was at an inaccurate state. This result reverses the onus of explanation from inaccurate mimicry to explaining the exceptional evolution and maintenance of accurate mimicry and highlights that the evolution of Batesian mimicry is ruled by multiple conflicting selective pressures.

Kelly, M. B., Derkarabetian, S., McLean, D. J., Shofner, R., Grismado, C. J., Haddad, C. R., Cassis, G., Giribet, G., Herberstein, M. E., & Wolff, J. O. Batesian Mimicry Converges Towards Inaccuracy in Myrmecomorphic Spiders. Systematic Biology. https://doi.org/10.1093/sysbio/syaf037