Abstract
The African species of the water beetle genus Ochthebius Leach (1815), subgenus Aulacochthebius Kuwert (1887) are revised. Nine new species are described, based on the examination and databasing of 5,911 specimens from 101 localities. Male genitalia are illustrated, and high resolution habitus images of the holotypes and specimens of previously described species are provided. Distribution maps are provided for the sixteen species now known from Africa and Madagascar, including specimens from Angola, Benin, Botswana, Burkina Faso, Chad, Ethiopia, Gambia, Ghana, Kenya, Lesotho, Mali, Morocco, Namibia, Nigeria, Senegal, South Africa, Uganda, Zimbabwe, and Madagascar. New species of O. (Aulacochthebius) are: O. (A.) copiosus n. sp.; O. (A.) flagellissimus n. sp.; O. (A.) latissimus n. sp.; O. (A.) mpumalangicus n. sp.; O. (A.) multilineatus n. sp.; O. (A.) nigeriensis n. sp.; O. (A.) persetosus n. sp.; O. (A.) scutatus n. sp.; and O. (A.) solitarius n. sp. The morphology of O. (A.) exaratus Mulsant, including the aedeagal morphology, is presented, and consequently O. (A.) strangulatus Régimbart is removed from synonymy with O. (A.) exaratus Mulsant.
References
Aguilera, P., Ribera, I. & Hernando, C. (1998) Notes on the Palaearctic species of Aulacochthebius, with a description of A. libertarius sp. n. from the Moroccan Anti Atlas (Coleoptera: Hydraenidae). European Journal of Entomology, 95, 629–637.
Bilton, D.T. & Perkins, P.D. (2012) Two new species of Parhydraenini from South Africa (Coleoptera: Hydraenidae). Zootaxa, 3342 (1), 51–59. https://doi.org/10.11646/zootaxa.3342.1.3
Bilton, D.T. (2013a) Description of the male of Sebasthetops omaliniformis Jäch, 1998—a phylogenetically isolated water beetle from South Africa, with notes on its ecology (Coleoptera: Hydraenidae). Zootaxa, 3635 (1), 94–100. https://doi.org/10.11646/zootaxa.3635.1.10
Bilton, D.T. (2013b) Prosthetops wolfbergensis sp. nov. – a giant amongst the ‘minute moss beetles’, with new data on other members of the genus (Coleoptera, Hydraenidae). Zootaxa, 3666 (3), 345–357. https://doi.org/10.11646/zootaxa.3666.3.5
Bilton, D.T. (2014a) New species and new records of Pterosthetops: eumadicolous water beetles of the South African Cape (Coleoptera, Hydraenidae). Zootaxa, 3811 (4), 438–462. https://doi.org/10.11646/zootaxa.3811.4.2
Bilton, D.T. (2014b) Two new water beetles from the Hantamsberg, an inselberg in the Northern Cape of South Africa (Coleoptera, Hydraenidae). Zootaxa, 3877 (4), 471–480. https://doi.org/10.11646/zootaxa.3877.4.5
Bilton, D.T. (2015a) New species and new records of Mesoceration from South Africa (Coleoptera: Hydraenidae). Zootaxa, 3972 (4), 495–520. https://doi.org/10.11646/zootaxa.3972.4.3
Bilton, D.T. (2015b) Two new species of madicolous water beetle from South Africa (Coleoptera: Hydraenidae). African Invertebrates, 56, 181–190.
Bilton, D.T. (2015c) A second Sebasthetops from South Africa (Coleoptera, Hydraenidae). Koleopterologische Rundschau, 85, 73–80.
Bilton, D.T. (2016) Two new water beetles from the South African Cape (Coleoptera, Hydraenidae). Zootaxa, 4137 (4), 585–591. https://doi.org/10.11646/zootaxa.4137.4.11
Bird, M.S., Bilton, D.T. & Perrissinotto, R. (2017) Diversity and distribution of polyphagan water beetles (Coleoptera) in the Lake St Lucia system, South Africa. Zookeys, 656, 51–84.
Bilton, D.T. (2017) Water beetles from the Bokkeveld Plateau: a semi-arid hotspot of freshwater biodiversity in the Northern Cape of South Africa. Zootaxa, 4268 (2), 191–214. https://doi.org/10.11646/zootaxa.4268.2.2
Bilton, D.T. (2018) A new humicolous species of Parhydraena d’Orchymont, 1937 from South Africa (Coleoptera, Hydraenidae). Zootaxa, 4378 (2), 284–288. https://doi.org/10.11646/zootaxa.4378.2.9
Bilton, D.T. & Mlambo, M.C. (2019) Two new Mesoceration Janssens, 1967 from the Piketberg, South Africa (Coleoptera, Hydraenidae). Zootaxa, 4555 (2), 268–274. https://doi.org/10.11646/zootaxa.4555.2.7
Bilton, D.T. (2021) Differentiation of South African coastal rock pool Ochthebius associated with major ocean currents (Coleoptera: Hydraenidae). Acta entomologica musei nationalis Pragae, 61, 253–260.
Bilton, D.T. (2021) Riberazantaena, a new hydraenid genus from the Eastern Arc Mountains of Tanzania (Coleoptera, Hydraenidae). Zootaxa, 4999 (6), 573–581. https://doi.org/10.11646/zootaxa.4999.6.4
Bilton, D.T. (2022) A new species of Protozantaena Perkins, 1997 from the Great Escarpment of South Africa (Coleoptera, Hydraenidae). Zootaxa, 5125 (1), 092–096. https://doi.org/10.11646/zootaxa.5125.1.6
Hansen, M. (1998) World Catalogue of Insects. Vol. 1. Hydraenidae (Coleoptera). Apollo Books, Stenstrup, 168 pp.
d’Orchymont, A. (1929) Notes pour la Classification des Aulacochthebius (Kuwert) Ganglbauer (Col. Palpicornia). Bulletin et Annales de la Société Entomologique de Belgique, 69, 191–202.
d’Orchymont, A. (1948) Mission Scientifique de l’Omo. Coleoptera XV. Hydraenidae. Mémoires du Museum National d’Histoire Naturelle, Nouvelle Serie, 27, 29–62.
Perkins, P.D. (1997) Life on the effective bubble: exocrine secretion delivery systems (ESDS) and the evolution and classification of beetles in the family Hydraenidae (Insecta: Coleoptera). Annals of Carnegie Museum, 66 (2), 89–207.
Perkins, P.D. (2004a) A revision of the South African endemic water beetle genus Pneuminion Perkins (Coleoptera: Hydraenidae). Zootaxa, 538 (1), 1–38. https://doi.org/10.11646/zootaxa.538.1.1
Perkins, P.D. (2004b) A revision of the South African endemic humicolous beetle genus Nucleotops Perkins and Balfour-Browne (Coleoptera: Hydraenidae). Zootaxa, 559 (1), 1–12. https://doi.org/10.11646/zootaxa.559.1.1
Perkins, P.D. (2005a) A revision of the South African endemic humicolous beetle genus Discozantaena Perkins and Balfour-Browne (Coleoptera: Hydraenidae). Zootaxa, 915 (1), 1–48. https://doi.org/10.11646/zootaxa.915.1.1
Perkins, P.D. (2005b) A revision of the African hygropetric genus Coelometopon Janssens, and description of Oomtelecopon new genus (Coleoptera: Hydraenidae). Zootaxa, 949 (1), 1–103. https://doi.org/10.11646/zootaxa.949.1.1
Perkins, P.D. (2007) Hydraenidae. In: Stals, R. & de Moor, I.J. (Eds.), Guides to the Freshwater Invertebrates of Southern Africa, Volume 10: Coleoptera. Water Research Commission, Pretoria, pp. 117–132.
Perkins, P.D. (2008) New species and new collection records for Prosthetopine water beetles from southern Africa (Coleoptera: Hydraenidae). Zootaxa, 1864 (1), 1–124. https://doi.org/10.11646/zootaxa.1864.1.1
Perkins, P.D. (2009) Revisions of the genera Parhydraena Orchymont, Protozantaena Perkins, Decarthrocerus Orchymont, and Parhydraenopsis nomen novum, aquatic and humicolous beetles from Africa and Madagascar, and comparative morphology of the tribe Parhydraenini (Coleoptera: Hydraenidae). Zootaxa, 2038 (1), 1–119. https://doi.org/10.11646/zootaxa.2038.1.1
Perkins, P.D. (2014) A revision of the water beetle genus Hydraena Kugelann for southern Africa (Coleoptera: Hydraenidae). Zootaxa, 3758 (1), 1–92. https://doi.org/10.11646/zootaxa.3758.1.1
Perkins, P.D. (2015) Taxonomy of the water beetle genus Limnebius in southern Africa (Coleoptera: Hydraenidae). Zootaxa, 3948 (1), 41–59. https://doi.org/10.11646/zootaxa.3948.1.3
Perkins, P.D. (2017) Hydraenidae of Madagascar (Insecta: Coleoptera). Zootaxa, 4342 (1), 1–264. https://doi.org/10.11646/zootaxa.4342.1.1
Perkins, P.D. (2019) Taxonomy of Venezuelan water beetles in the genus Hydrochus Leach, 1817, and an analysis of male genitalia morphology (Coleoptera: Hydrochidae). Zootaxa, 4708 (1), 1–59. https://doi.org/10.11646/zootaxa.4708.1.1
Perkins, P.D. (2022) Thirty-three new species of water beetles in the genus Hydraena Kugelann from Cameroon (Coleoptera: Hydraenidae). Zootaxa, 4858 (1), 035–52. https://doi.org/10.11646/zootaxa.4858.1.2
Perkins, P.D. & Balfour-Browne, J. (1994) Contribution to the taxonomy of aquatic and humicolous beetles of the family Hydraenidae in southern Africa. Fieldiana: Zoology, New Series, 77, 1–159. https://doi.org/10.5962/bhl.title.3533
Régimbart, M. (1906) Voyage de M. Ch. Alluaud dans l’Afrique Orientale. Dytiscidae, Gyrinidae, Hydrophilidae. Annales de la Société entomologique de France, 75, 235–278.
Valladares, L.F., Díaz, J.A., Garrido, J., Sáinz-Cantero, C.E. & Delgado, J.A. (2018) Coleoptera Hydraenidae. In: Ramos, M.A. (Ed.), Fauna Ibérica. Vol. 44. Museo Nacional de CienciasNaturales, CSIC, Madrid, pp. 1–520.
Villastrigo, A., Jäch, M.A., Cardoso, A., Valladares, L.F. & Ribera, I. (2018) A molecular phylogeny of the tribe Ochthebiini (Coleoptera, Hydraenidae, Ochthebiinae). Systematic Entomology, 44, 273–288 + 1– 21 (unnumbered) pp. (supporting information). https://doi.org/10.1111/syen.12318