One more step in solving the Chydorus puzzlea morphological comparison between Chydorus tilhoi Rey & Saint-Jeans, 1969 and Chydorus sphaericus (O.F. Mller, 1776) (Crustacea: Cladocera).

IF 0.8 4区生物学 Q3 ZOOLOGY

Zootaxa Pub Date : 2024-03-14 DOI:10.11646/zootaxa.5424.3.2

Francisco Diogo Rocha Sousa, Barbara Aparecida Souza DA Silva, Lourdes M A Elmoor-Loureiro, Camila Moreira-Silva, Greyce Espolau, Hugo Sarmento, Mwapu Isumbisho, Alberto V Borges, Gilmar Perbiche-Neves

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引用次数: 0

Abstract

A number of species of Chydorus Leach, 1816 (Crustacea: Cladocera) need improvements in their taxonomy much more than any other genus within the family Chydoridae Dybowsky & Grochowski, 1894 emend. Frey, 1967, which makes the systematics of the genus still a puzzle that lacks several pieces. Here, we redescribe the African species Chydorus tilhoi Rey & Saint-Jeans, 1969 and compare its morphology with that of Chydorus sphaericus (O.F. Mller, 1776). The two taxa might be easily differentiated because C. tilhoi has a single and relatively large major head pore with a wide rim, labral keel elongated with a large spine, and postabdomen with postanal part elongated, narrowing distally and with denticles near its anal margin, organized in groups. These morphological traits are absent in C. sphaericus. Chydorus tilhoi and C. sphaericus also differ in the morphology of the first (Inner Distal Lobe setae), third (exopodite proportion), and fifth (exopodite shape) limbs. Based on the literature and our observations, the limb morphology of C. tilhoi has important similarities with that of C. breviceps, C. nitidulus and C. dentifer, and their translocation to a new genus seems to be a fundamental piece in the puzzle of Chydorus.

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在解决 Chydorus 之谜方面又迈出了一步a Chydorus tilhoi Rey & Saint-Jeans, 1969 与 Chydorus sphaericus (O.F. Mller, 1776) 的形态比较（甲壳动物：Cladocera）。

与 Chydoridae Dybowsky & Grochowski, 1894 emend.Frey, 1967），这使得该属的系统学仍然是一个缺乏多块拼图的谜团。在此，我们重新描述了非洲种 Chydorus tilhoi Rey & Saint-Jeans，1969 年，并将其形态与 Chydorus sphaericus（O.F. Mller，1776 年）进行了比较。这两个类群很容易区分，因为 C. tilhoi 的头部有一个相对较大的单个主孔，孔缘较宽；唇龙骨拉长，有一个大刺；后腹部的肛门后部拉长，上部变窄，肛门边缘附近有成群的小齿。C. sphaericus 没有这些形态特征。Chydorus tilhoi 和 C. sphaericus 的第一肢（内侧远叶刚毛）、第三肢（外侧刚毛比例）和第五肢（外侧刚毛形状）的形态也不同。根据文献和我们的观察，C. tilhoi 的肢体形态与 C. breviceps、C. nitidulus 和 C. dentifer 的肢体形态有重要的相似之处，将它们归入一个新属似乎是 Chydorus 之谜的一个基本部分。

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来源期刊

Zootaxa 生物-动物学

CiteScore

1.90

自引率

33.30%

发文量

1895

审稿时长

2.7 months

期刊介绍： Zootaxa is a peer-reviewed international journal for rapid publication of high quality papers on any aspect of systematic zoology, with a preference for large taxonomic works such as monographs and revisions. Zootaxa considers papers on all animal taxa, both living and fossil, and especially encourages descriptions of new taxa. All types of taxonomic papers are considered, including theories and methods of systematics and phylogeny, taxonomic monographs, revisions and reviews, catalogues/checklists, biographies and bibliographies, identification guides, analysis of characters, phylogenetic relationships and zoogeographical patterns of distribution, descriptions of taxa, and nomenclature. Open access publishing option is strongly encouraged for authors with research grants and other funds. For those without grants/funds, all accepted manuscripts will be published but access is secured for subscribers only.