Coronatella circumfimbriata ( Megard, 1967 )

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

Coronatella circumfimbriata ( Megard, 1967)

( Fig 11 )

Megard 1967: 37–40, fig. 1–7, pl. I, figs 1–6 ( Alona ); Smirnov 1971: 359, fig. 414 ( Alona ); Sinev 2009: 66–70, Fig. 4–5 ( Alona ).

Type locality. Lake Itasca, Clearwater County, Minnesota, U.S.A.

Holotype. Parthenogenetic female; British Museum (Nat. Hist.), London, 1966.3.21.3.

Material studied. 5 parthenogenetic females from pond near road to Los Arquitos town (in El Cariñan farm). Jesús María, Aguascalientes, 0 7.07.1988, AYS; 2 parthenogenetic females from Pond near La Tomatina town. Jesús María, Aguascalientes, 12.12.1989, AYS; 1 parthenogenetic female from small pond near El Colorín farm, Jesús María, Aguascalientes. 0 9.04.1993, AYS; 7 parthenogenetic females from pond in Gracias a Dios town, Jesús María, Aguascalientes, 0 9.04.1988, AYS; 2 parthenogenetic females from Pond in San Miguel de los Sandovales town. El Llano, Aguascalientes, 12.10.1991, AYS; 3 parthenogenetic females from Pond near La Gloria town. Asientos, Aguascalientes. 18.12.1990, AYS; 8 parthenogenetic females from Pond beside Mesa Montoro, Calvillo, Aguascalientes. 0 6.10.1990, AYS.

Comments. Morphology of the studied specimens ( Fig. 11A–D ) completely agrees with the recent redescription of the species (Sinev, 2009b).

Distribution. It is distributed from North Canada (Chengalath, 1982) to North Mexico (Elías-Gutiérrez, 1997). According to Chengalath (1982), it is a eurybiotic species, distributed in different types of lakes, including those with brackish water. An interesting feature of A. circumfimbriata is its ability to inhabit streams. In Indiana it is one of four most common species of Cladocera in such habitats ( Vila 1989). In Aguascalientes, it is found in the dry and temperate regions, but one locality, a pond beside Mesa Montoro, Calvillo, is to close to the subtropical zone.

Figures

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 5. Alona anamariae sp. nov. from La Araña dam, Sierra Fría, San Josй de Gracia, Aguascalientes State, Mexico. A – B, juvenile females of instars I and II. C –, parthenogenetic female. C, lateral view. D, ventral margin of valves. E – F, head pores. G – H, postabdomen. Scale bars denote 0.1 mm for A – C and D, 0.05 for E – H.

FIGURE 11. A – D, Coronatella circumfimbriata (Megard, 1967) from pond beside Mesa Montoro, Calvillo, Aguascalientes State, Mexico, parthenogenetic female. A, lateral view. B, posteroventral corner of valves. C, postabdomen. D, IDL and ODL of limb I. E – H, Leberis davidi (Richard, 1895) from pond near road to La Colorada town, El Llano, Aguascalientes State, Mexico, parthenogenetic female. E, lateral view. F, posteroventral corner of valves. G, postabdomen. H, IDL of limb I. Scale bars denote 0.1 mm for A and E, 0.05 mm for B – D and F – H.