Subfamily Sphaeridiinae

Pintar, M.R. 2023. Coelostoma orbiculare (Fabricius) (Coleoptera: Hydrophilidae: Sphaeridiinae): new records and distribution in North America. The Coleopterists Bulletin 77 (3): 382–385.
doi.org/10.1649/0010-065X-77.3.382

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Full title: Redescriptions and lectotype designations of Central American species of Phaenonotum Sharp (Coleoptera, Hydrophilidae) based on the type material from the David Sharp collection
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Ten species are recorded (of which five are described as new):
C. armatipenis sp.n.
C. floridanus BG page
C. gimmeli sp.n.
C. insularis
C. nigriceps
C. praetextatus BG page
C. quisquilius
C. sklodowskae sp.n.
C. spiniventris sp.n.
C. taino sp.n.

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Short A.E.Z. & Fikacek M. 2013. Molecular phylogeny, evolution, and classification of the Hydrophilidae (Coleoptera). Systematic Entomology 38: 723-​752.

Abstract. The phylogeny and evolutionary history of the water scavenger beetles (Coleoptera: Hydrophilidae) are inferred from comprehensive analyses of DNA sequence data from the mitochondrial genes COI, COII and 16S and the nuclear genes 18S, 28S and arginine kinase. Bayesian and maximum parsimony analyses included 151 taxa, representing all subfamilies, tribes and subtribes that have ever been proposed in the family, as well as representatives of the hydrophiloid families Helophoridae, Hydrochidae, Spercheidae, Epimetopidae and Georissidae. The resulting well-supported trees strongly disagree with prior classifications of the Hydrophilidae, suggesting that the smaller subfamilies (Horelophinae, Horelophopsinae and Sphaeridiinae) are derived from within the larger Hydrophilinae. The existing tribal classification is more compatible with our results, but many significant differences are evident. Here, we present a new classification of the Hydrophilidae comprising 6 subfamilies and 12 tribes. Each subfamily and tribe is reviewed in detail with (i) a morphological diagnosis, including known or putative morphological synapomorphies, (ii) its taxonomic circumscription, including genera not included in our analyses, and (iii) a review of its general biology and geographic distribution. A new identification key to subfamily and tribe based on adult morphology is also provided.