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Issue: Vol. 5563 No. 1: 3 Jan. 2025
Type: Article
Published: 2025-01-03
DOI: 10.11646/zootaxa.5563.1.14
Page range: 209-221
Abstract views: 172
PDF downloaded: 10

MicroCT Scan visualization of femur IV apophyses: a promising tool for phylogenetic reconstruction in K92, exemplified by a new species of Cajango (Arachnida: Opiliones: Gonyleptidae)

Departamento de Invertebrados; Museu Nacional/Universidade Federal do Rio de Janeiro; Quinta da Boa Vista; São Cristóvão; 20.940-040 Rio de Janeiro (RJ); Brazil
Departamento de Vertebrados; Museu Nacional/Universidade Federal do Rio de Janeiro; Quinta da Boa Vista; São Cristóvão; 20.940- 040 Rio de Janeiro (RJ); Brazil
Opiliones Caelopyginae Minas Gerais Bahia sexual dimorphism terminology

Abstract

In this study, we utilize microCT scan technology to investigate the morphology of femur IV in a new species of the genus Cajango, a member of the clade K92 of Gonyleptidae. The femur IV in males of K92 is often characterized by heavy spiniform apophyses arranged in longitudinal rows, referred to as armature. We discuss the potential of this technique to enhance future phylogenetic analyses by providing additional morphological characters. Cajango ednardoi sp. nov. is described from the Biological Reserve of Mata Escura, situated in the middle course of the Jequitinhonha River in eastern Brazil. This reserve falls within WWF Ecoregion NT0104 (Bahia interior forests). The genus Cajango already includes three other species, all of which are found along the northern bank of the Jequitinhonha River, but considerably closer to the coast in Bahia state, within NT0103 (Bahia coastal forests). The discovery of the new species extends the combined range of the genus further westward, marking its first recorded occurrence within the state of Minas Gerais. Additionally, it appears to be restricted to altitudes between 750 and 1100 meters, whereas most records of the other three species are from altitudes below 600 meters. The new species is most similar in general appearance to Cajango pestifer Kury & Bernabé, 2023. However, the armature of the male femur IV is more profuse, and the male genitalia do not share the extremely elongated ventral plate with deep cleft found in all other Cajango species. This suggests that the new species may represent the earliest branch of the genus, standing as the sister-group to all others, which, in turn, share slender femur IV and specialized genitalia.

 

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