Alona ossiani Sinev, 1998

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 : 20

Alona ossiani Sinev, 1998

( Fig 10 )

Sars, 1901, 48–49, Pl. IX, fig. 1, a–d ( affinis ); Daday, 1905: 171–172, Taf. X, Fig. 26–27 ( affinis ); Sinev 1998: 105–110, Fig 1–4 .

Type locality. Neighborhood of San Paolo, Brazil.

Type material. Holotype. Male, Zoological Museum of Oslo University, GOS slide F12324a.

Studied material. 5 parthenogenetic females from pond near Laguna Seca pond, San Josй de Gracia, Aguascalientes, 25.09.1993, AYS; 38 parthenogenetic females from Pond 4, Mesa Montoro, Calvillo, Aguascalientes, 0 5.10.1990, AYS.

Comments. Alona ossiani is a sibling-species to Palearctic Alona affinis (Leydig, 1860) . These species clearly differs by the male morphology (see Sinev, 1998), but their parthenogenetic females are not obviously distinguishable (Sinev, 2009a). According to Sinev (2009a), A. ossiani is the only species of the affinis -group known from the Americas. Specimens in our material ( Figs. 10 K–M) demonstrated no significant differences from those from the type population of A. ossiani (see Sinev, 1998).

Distribution. Alona ossiani appears to be widely distributed in North and South America, but precise records of this species, with male morphology described, are sparse (Sinev, 2009a). In Aguascalientes, it is found in cold regions in two mountainous areas: Mesa Montoro mountain, over 2,500 m.a.s.l., and Laguna Seca pond in Sierra Fría mountain, at 3,100 m.a.s.l.

Figures

FIGURE 1. Alona aguascalientensis sp. nov. pond beside highway Villa Hidalgo city—Aguascalientes city, Aguascalientes State, Mexico. A – B, juvenile females of instar I and II. C – J—parthenogenetic female. C, lateral view. D, valve. E – H, posteroventral angle of valves. I – J, head pores. K, instar II juvenile male. L, adult male. Scale bars denote 0.1 mm for A – C, K – L and D; 0.05 mm for E – J.

FIGURE 3. Alona aguascalientensis sp. nov. pond beside highway Villa Hidalgo city—Aguascalientes city, Aguascalientes State. Mexico. A – E, parthenogenetic female. A – B, labrum. C – D, postabdomen. E, antennule. F – G, antenna. H – I, instar II juvenile male. H, postabdomen. I, antennule. J – K, adult male. J, postabdomen. K, antennule. Scale bars denote 0.1 mm for F, 0.05 for A – E, G – K.

FIGURE 4. Alona aguascalientensis sp. nov. pond beside highway Villa Hidalgo city—Aguascalientes city, Aguascalientes State. Mexico. A – I, limbs of parthenogenetic female. A, limb I. B, IDL and ODL of limb I. C, limb II. D, exopodite of limb II. E, exopodite of limb III. F, distal part of inner portion of limb III. G, exopodite of limb IV. H, inner portion of limb IV. I, limb V. J – K, limb I of instar II juvenile male. L – M, limb I of adult male. Scale bar denotes 0.05 mm.

FIGURE 10. A – J, Alona cf. guttata Sars, 1862 from Pond 1, 2.5 Kms north of La Congoja town, San Josй de Gracia, Aguascalientes State, Mexico, parthenogenetic female. A, limb I. B, IDL and ODL of limb I. C, limb II. D, exopodite of limb III. E – F, inner portion of limb III. G, exopodite of limb IV. H, inner portion of limb IV. I, limb V. J, limb VI. K – M, Alona ossiani Sinev, 1998 from Pond 4 at Mesa Montoro mountain, Calvillo, Aguascalientes State, Mexico, parthenogenetic female. K, lateral view. L, head pores. M, postabdomen. Scale bars denote 0.2 mm for K, 0.1 mm for L – M, 0.05 for A – J.