Larva of Lara avara, photographed by Larry Serpa.

Belongs within: Elateriformia.

The Elmidae are a group of mostly aquatic beetles (invariably aquatic as larvae) that feed on decaying vegetation and algae. Larvae breath through anal gills, while adults carry an air bubble when going underwater.

Characters (from Lawrence & Britton 1991): Small to minute, darkly pigmented, with moderately short, slender or slightly incrassate antennae, moderately to widely separated coxae, long legs with simple tarsi and long claws. Larvae onisciform to cylindrical, with movable operculum and paired hooks on S9 and three pairs of retractile anal gills. Adult Elminae glabrous or sparsely pubescent above but have ventral tomentose tracts that serve as a plastron; adult Larainae densely pubescent but lack a plastron.

    |  i. s.: Urumaelmis uenoi (Nomura 1961) [=Zaitzevia uenoi] S86
    |         Zaitzevia rufa Nomura & Baba 1961 I92
    |         Hydora AY04
    |--Lara LeConte 1852 [Larainae] O08
    |    |--*L. avara LeConte 1852 O08
    |    `--L. gehringi Darlington 1929 O08
    `--Elminae S86
         |--Anommatelmis Spangler 1981 S86
         |    `--A. botosaneanui Spangler 1981 S86
         |--Troglelmis Jeannel 1950 S86
         |    `-T. leleupi Jeannel 1950 S86
         `--Lemalelmis Spangler 1981 S86
              |--L. fontana Spangler 1981 S86
              `--L. minyops Spangler 1981 S86

*Type species of generic name indicated


[AY04] Austin, A. D., D. K. Yeates, G. Cassis, M. J. Fletcher, J. La Salle, J. F. Lawrence, P. B. McQuillan, L. A. Mound, D. J. Bickel, P. J. Gullan, D. F. Hales & G. S. Taylor. 2004. Insects 'Down Under' - diversity, endemism and evolution of the Australian insect fauna: examples from select orders. Australian Journal of Entomology 43 (3): 216-234.

[I92] Iwahashi, J. (ed.) 1992. Reddo Deeta Animaruzu: a pictorial of Japanese fauna facing extinction. JICC: Tokyo.

Lawrence, J. F., & E. B. Britton. 1991. Coleoptera. In: CSIRO. The Insects of Australia: A textbook for students and research workers, 2nd ed., vol. 2, pp. 543-683. Melbourned University Press.

[O08] Ă–zdikmen, H. 2008. Nomenclatural changes for some preoccupied harvestman genus group names (Arachnida: Opiliones). Turkish Journal of Arachnology 1 (1): 37-43.

[S86] Spangler, P. J. 1986. Insecta: Coleoptera. In Stygofauna Mundi: A Faunistic, Distributional, and Ecological Synthesis of the World Fauna inhabiting Subterranean Waters (including the Marine Interstitial) (L. Botosaneanu, ed.) pp. 622-631. E. J. Brill / Dr. W. Backhuys: Leiden.

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