Alona glabra Sars, 1901

Sinev, Artem Y. & Silva-Briano, Marcelo, 2012, Cladocerans of genus Alona Baird, 1843 (Cladocera: Anomopoda: Chydoridae) and related genera from Aguascalientes State, Mexico, Zootaxa 3569, pp. 1-24 : 13-15

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Alona glabra Sars, 1901


Alona glabra Sars, 1901  

( Fig 7 View FIGURE 7. A – E )

Sars, 1901, p. 49–51, Pl. 9: figs. 6, 6a; Richard 1897, p. 289–290, figs 35–36 ( cambouei   ); Daday 1905, p. 173–174, Pl. 11, figs 3–4; Delachaux 1919, p. 28, Pl. 2, fig. 10 ( cambouei   ); Harding 1955, p. 343–344, figs. 61–64 ( cambouei   ); Uéno 1967, p. 559, figs 35–36 ( cambouei   ); Infante 1980, p. 598–599, figs 5 a–c ( pulchella   ); Albertina Kameya 1986, p. 135–136, fig. 6–7; Sinev 2001 a, p. 203–280, figs 1–40; Elmoor-Loureiro et al. 2004, p. 417, figs 12–13; Kotov, Sinev & Berrios, 2010: 33.

Type locality of A. glabra   is " Argentina ", no further information was given by Sars (1901).

Lectotype. Female, GOS F 12326 View Materials a.

Studied material: 12 parthenogenetic females, 2 males from pond between El Picacho and Loma La Plata mountains. Aguascalientes. 23.10. 1988 AYS; 20 parthenogenetic females from pond beside highway Aguascalientes city – Calvillo city. Calvillo, Aguascalientes, 0 3.09. 1991, AYS.

Comments. Both females ( Figs. 7 A–B View FIGURE 7. A – E ) and males ( Fig. 7 C–E View FIGURE 7. A – E ) were found. Morphology of the studied specimens completely agrees with the recent redescription of the species ( Sinev 2001 a). In our material there were no specimens with tuberculated valves, reported by Kotov et al. (2010) for Andean populations.

In course of the redescription of the species, Sinev (2001 a) did not provide a description of male antennule. In studied male specimens, antennule ( Fig. 7 E View FIGURE 7. A – E ) moderately thick, length about 2 widths, provided with two lateral and ten terminal aesthetascs of similar length, about 2 / 3 length of antennule. Male seta short and thick, arising at 3 / 4 distance from the base, not reaching to the end of antennule. Such morphology of antennule is typical for the group, recorded for all species with known males.

In Aguascalientes, Alona glabra   can be at first glance confused with A. aguascalientensis   sp. nov. specimens without denticles on posteroventral corner of valves. But A. glabra   clearly differs by connected major head pores, protruding distal angle of postabdomen and by the morphology of postanal marginal denticles of postabdomen. In A. glabra   , two-three distalmost denticles are significantly larger than others, while in A. aguascalientensis   sp. nov., all denticles are of the same size. Male of A. glabra   clearly differs from that of A. aguascalientensis   sp. nov. by a shorter basal spine of the postabdominal claw.

Distribution. Common in Neotropics, including Mexico ( Sinev 2001 a; Elías-Gutiérrez et al. 2008 a), encountered in Chilean and Bolivian Andes as well as in lowland (Kotov et al. 2010; Coronel et al. 2007). In Aguascaliantes, A. glabra   is found in the south of the state, close to the subtropical region.