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.