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Issue: Vol. 5424 No. 3: 14 Mar. 2024
Type: Article
Published: 2024-03-14
DOI: 10.11646/zootaxa.5424.3.2
Page range: 308-322
Abstract views: 12
PDF downloaded: 3

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

Laboratório de Taxonomia Animal; Instituto de Biociências; Universidade Federal de Jataí—UFJ; BR 364 km 195 n°3800; CEP 75801-615; Jataí; GO; Brazil
Laboratório de Plâncton; Departamento de Hidrobiologia; CCBS; Universidade Federal de São Carlos- UFSCar; São Carlos; SP; Brazil
Laboratório de Taxonomia Animal; Instituto de Biociências; Universidade Federal de Jataí—UFJ; BR 364 km 195 n°3800; CEP 75801-615; Jataí; GO; Brazil; Independent Researcher
Programa de Pós-graduação em Ciências Biológicas (Zoologia); Universidade Estadual Paulista- UNESP; Instituto de Biociências; CEP 18618-970; Botucatu; Brazil
Laboratório de Plâncton; Departamento de Hidrobiologia; CCBS; Universidade Federal de São Carlos- UFSCar; São Carlos; SP; Brazil
Laboratório de Plâncton; Departamento de Hidrobiologia; CCBS; Universidade Federal de São Carlos- UFSCar; São Carlos; SP; Brazil
Unité d’Enseignement et de Recherche en Hydrobiologie Appliquée; Département de Biologie-Chimie; ISP/Bukavu; Bukavu; Democratic Republic of the Congo; Africa
University of Liège; Chemical Oceanography Unit; Liège; Belgium
Laboratório de Plâncton; Departamento de Hidrobiologia; CCBS; Universidade Federal de São Carlos- UFSCar; São Carlos; SP; Brazil
Crustacea Africa Congo River Basin morphometry redescription taxonomy

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. Müller, 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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