巴西地底蜘蛛新一种(蜘蛛目:蛛科)及其troglomerorphic性状分析

IF 1 3区农林科学 Q3 ENTOMOLOGY

Journal of Arachnology Pub Date : 2022-03-01 DOI:10.1636/JoA-S-20-068

Igor Cizauskas, Daniele Polotow, J. Gallão, M. E. Bichuette, A. Brescovit

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引用次数: 1

摘要

摘要在这项工作中，我们描述了第一种来自南美洲的栉蛛，它具有明显的trogloorphic特征，包括细长的附属物，眼睛减少和身体色素脱色。这种新物种只出现在巴西东北部巴伊亚州一个独特的砂岩洞穴中。外生殖器的形态表明，Ctenus igatu sp. 11 .与Ctenus fasciatus mello - leit， 1943，一种来自巴西东南部圣保罗州洞穴的兼性地下物种密切相关。此外，我们还比较了19种栉蚊(17种表生种、筋膜栉蚊和本文所述的新穴居种)的甲壳长与腿长、眼径与甲壳长之比等可能与地下生境隔离有关的形态学特征。我们的分析表明，两种物种都有形态上的troglomorphisms，其中有明显的向地下生活的特化。

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Ctenus igatu sp. nov. (Araneae: Ctenidae): a new subterranean spider from Brazil with an analysis of troglomorphic traits

Abstract. In this work we describe Ctenus igatu sp. nov., the first ctenid spider from South America with conspicuous troglomorphic traits, including elongated appendages, reduction of eyes, and body depigmentation. The new species is only known to occur in a unique sandstone cave from the state of Bahia, north-eastern Brazil. The morphology of the genitalia suggests that Ctenus igatu sp. nov. is closely related to Ctenus fasciatus Mello-Leitão, 1943, a facultative subterranean species from caves in the state of São Paulo, south-eastern Brazil. In addition, we compared morphological traits possibly related to the isolation in subterranean habitats, such as ratios between carapace length vs. leg IV length and eye diameters vs. carapace length, of 19 species of Ctenus (17 epigean species, C. fasciatus and the new troglobitic species described herein). Our analysis showed that both C. fasciatus as C. igatu sp. nov. have morphological troglomorphisms, with C. igatu sp. nov. showing marked specializations to subterranean life.

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来源期刊

Journal of Arachnology 生物-昆虫学

CiteScore

2.20

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of Arachnology publishes scientific articles reporting novel and significant observations and data regarding any aspect of the biology of arachnid groups. Articles must be scientifically rigorous and report substantially new information.