• Antennae with a large lateral expansion on basal joint of dorsal ramus
• Ventral head plate with a long posterior outgrowth
• Eye is situated dorsally
• Postabdomen with 9 to 11 anal teeth
• Long setae on posterior margin of valves

• In 2008 Korovchinsky reinstated Latona glacialis as a valid species endemic to Greenland. The main distinguishing feature being a ventral head plate with a long posterior outgrowth (2). Initially two specimens of Latona were found in the Salmon Falls River Reservoir, New Hampshire / Maine which exhibited this feature. Further sampling uncovered two more specimens (one male) from Lake Christine in northern NH.

(1) KOROVCHINSKY, N.M. 1992. Sididae & Holopediidae. Guides to the Identification of the Microinvertebrates of the Continental Waters of the World 3. SBA Academic Publishers, The Hague, 82 pp.

(2) KOROVCHINSKY, N.M. 2008. Redescription of Latona setifera (O.F. Müller, 1776) from the type locality and reinstatement of Latona glacialis Wesenberg-Lund, 1894 (Crustacea: Cladocera: Sididae) as a valid species. Streenstrupia. 30: 1-19.