Abstract
Petrodessus conatus sp. n., new genus and species, is described from hygropetric habitats in northeastern Australia. Thegenus is similar to Uvarus Guignot, 1939 or Microdessus Young, 1967 in lacking a transverse occipital line, a transversecarina on elytral epipleuron at the humeral angle and having both basal elytral and pronotal striae. The genus differs fromthese in having the anterior margin of the clypeus distinctly modified, flattened and anteriorly produced. This characterstate is somewhat more like that in Clypeodytes Régimbart, 1894, Leiodytes Guignot, 1936, Neoclypeodytes Young, 1967,but Petrodessus n. gen. differs from these in lacking a transverse occipital line and having the basal elytral and pronotal striae distinctly and strongly impressed. This is the first hygropetric diving beetle described from Australia.References
Balke, M. & Ribera, I. (2004) Jumping across Wallace's line: Allodessus Guignot and Limbodessus Guignot revisited (Coleoptera: Dytiscidae, Bidessini) based on molecular-phylogenetic and morphological data. Australian Journal of Entomology, 43, 114–128.
Balke, M., Ribera, I. & Beutel, R. G. (2003) Aspidytidae: On the discovery of a new beetle family: detailed morphological analysis, description of a second species, and key to fossil and extant adephagan families, pp. 53–63. In: Jäch, M.A. & Ji, L. (eds), Water beetles of China, Vol. 3. Zoologisch-Botanische Gesellschaft in Österreich and Wiener Coleopterologenverein, vi + 572 pp.
Biström, O. (1988) Generic review of the Bidessini (Coleoptera, Dytiscidae). Acta Zoologica Fennica, 184, 1–41.
Brancucci, M. & Monteith, G.B. (1997) A second Terradessus species from Australia (Coleoptera, Dytiscidae). Entomologica Basiliensia, 19, 585–591.
Miller, K.B. (2001) Revision and phylogentic analysis of the New World genus Neoclypeodytes Young (Coleoptera: Dytiscidae: Hydroporinae: Bidessini). Systematic Entomology, 26, 87–123.
Miller, K.B. (2009) On the systematics of Noteridae (Coleoptera: Adephaga: Hydradephaga): Phylogeny, description of a new tribe, genus and species, and survey of female genital morphology. Systematics and Biodiversity, 7, 191–214.
Miller, K.B. & Spangler, P.J. (2008) Fontidessus Miller and Spangler, a new genus of Bidessini from Venezuela (Coleoptera: Dytiscidae: Hydroporinae) with three new species. Zootaxa, 1827, 45–52.
Perkins, P.D. (2005) A revision of the African hygropetric genus Coelometopon Janssens, and description of Oomtelecopon new genus (Coleoptera: Hydraenidae). Zootaxa, 949, 1–103.
Perkins, P.D. (2006) A revision of the Australian humicolous and hygropetric water beetle genus Tympanogaster Perkins, and comparative morphology of the Meropathina (Coleoptera: Hydraenidae). Zootaxa, 1346, 1–396.
Ribera, I., Beutel, R.G., Balke, M. & Vogler, A.P. (2002) Discovery of Aspidytidae, a new family of aquatic Coleoptera. Proceedings of the Royal Society Biological Sciences Series B, 269, 2351–2356.
Short, A.E.Z. & García, M. (2010) A review of the Oocyclus Sharp of Venezuela with description of twelve new species (Coleoptera: Hydrophilidae: Laccobiini). Zootaxa, 2635, 1–31.
Spangler, P.J. & Steiner, W. E. (2005) A new aquatic beetle family, Meruidae, from Venezuela (Coleoptera: Adephaga). Systematic Entomology, 30, 339–357.
Watts, C.H.S. (1982) A blind terrestrial water beetle from Australia. Memoirs of the Queensland Museum, 20, 527–531.