A new genus and species of miniature tridentine catfish from the Amazon basin (Siluriformes: Trichomycteridae)

IF 2 4区生物学 Q1 ZOOLOGY Neotropical Ichthyology Pub Date : 2023-01-01 DOI:10.1590/1982-0224-2023-0076

Alessio Datovo, Luz Ochoa, George Vita, Paulo Presti, William M. Ohara, Mario C. C. de Pinna

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Abstract

Abstract A new miniature tridentine catfish is described from the rio Purus drainage, Amazon basin, Brazil. It differs from all other tridentines in having several unique autapomorphies: conspicuous anteromedial protuberance in the snout; set of symphyseal premaxillary and dentary teeth inclined posteromedially; distal process of the hyomandibula directed anteriorly; rod-like orbitosphenoid ossified only ventral to the optic nerve; mesethmoid cornua inclined ventrolaterally; opercular and interopercular odontodophores separated by a large interspace; basipterygia fused sagittally; and conspicuous dark brown horizontal stripe in the middle of the caudal fin. The new taxon is hypothesized to be sister to the clade formed by Tridensimilis and Tridens. A detailed osteological description of the new taxon is provided based on X-ray microcomputed tomography (µCT-scans) data and on cleared and stained specimens. Our analysis also reveals that “Tridens” brevis, an enigmatic species that has been indecisively assigned to three different tridentine genera over the past 134 years, belongs to Tridentopsis.Consequently, Tridensimilis is a monotypic genus that currently includes only T. venezuelae.

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亚马逊河流域微型三角鲶鱼一新属、新种(蛭形目:毛鳞鱼科)

摘要描述了巴西亚马逊河流域里约热内卢Purus流域一种新的微型三叉戟鲶鱼。它不同于所有其他的三叉戟在有几个独特的自异形:在鼻部明显的前内侧突起;一组联合的前上颌和近颌牙齿后内侧倾斜;下颌肱骨远端前突;杆状眶蝶骨仅在视神经腹侧骨化;中筛角腹外侧倾斜;眼周和眼周间有较大的间隙;矢状融合的盆柄;在尾鳍中部有明显的深棕色水平条纹。这个新分类群被认为是由Tridensimilis和Tridens组成的分支的姐妹。基于x射线微计算机断层扫描(微ct扫描)数据以及清除和染色标本，提供了新分类群的详细骨学描述。我们的分析还揭示了Tridens brevis，一个在过去134年里被不确定地划分为三个不同的tridentine属的神秘物种，属于Tridentopsis。因此，三叉戟属是一个单型属，目前只包括委内瑞拉三叉戟属。

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来源期刊

Neotropical Ichthyology 生物-动物学

CiteScore

2.80

自引率

17.60%

发文量

审稿时长

6-12 weeks

期刊介绍： Neotropical Ichthyology is the official journal of the Sociedade Brasileira de Ictiologia (SBI). It is an international peer-reviewed Open Access periodical that publishes original articles and reviews exclusively on Neotropical freshwater and marine fishes and constitutes an International Forum to disclose and discuss results of original research on the diversity of marine, estuarine and freshwater Neotropical fishes. -Frequency: Four issues per year published only online since 2020, using the ‘rolling pass’ system, which posts articles online immediately as soon as they are ready for publication. A searchable and citable Digital Object Identifier (DOI) is assigned to each article immediately after online publication, with no need to await the issue’s closing. -Areas of interest: Biology, Biochemistry and Physiology, Ecology, Ethology, Genetics and Molecular Biology, Systematics. -Peer review process: The Editor-in-Chief screens each manuscript submitted to Neotropical Ichthyology to verify whether it is within the journal’s scope and policy, presents original research and follows the journal’s guidelines. After passing through the initial screening, articles are assigned to a Section Editor, who then assigns an Associate Editor to start the single blind review process.