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Species Cercyon nigriceps

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Revision of the beach-dwelling species of Cercyon Leach (Coleoptera: Hydrophilidae) of the West Coast of North America
By Suzumura A., Kobayashi N., Ôhara M.
Col. Bull. 73: 473‒493, 2019

A review of the Cercyon Leach (Coleoptera, Hydrophilidae, Sphaeridiinae) of the Greater Antilles
By Emmanuel Arriaga-Varela, Matthias Seidel, Albert Deler-Hernández, Viktor Senderov, Martin Fikácek
ZooKeys 681: 39-93, 2017
Full text (PDF)

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.

Occurrence of introduced species of the genus Cercyon (Coleoptera: Hydrophilidae) in the Neotropical Region
By M. Fikáček
Rev. Soc. Entomol. Argent. 68: 351-357, 2009

Revision of the subfamily Sphaeridiinae of America north of Mexico (Coleoptera: Hydrophilidae)
By Smetana A.
Mem. Ent. Soc. Canada 105: 1–292, 1978

2 supplements have been published in 1979 (Can. Entomol. 111: 959-966) and 1984 (Can. Entomol. 116: 555-566)

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

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.

The Hydrophilinae of Delaware (Coleoptera: Hydrophilidae)
By Short, A.E.Z.
The Coleopterists Bulletin, 58: 598-599, 2004
52 species recorded, 33 of which are newly recorded.

Review of the Family Hydrophilidae of Canada and Alaska
By Ales Smetana
Entomological Society of Canada, 1988
Smetana, A. 1988. Review of the Family Hydrophilidae of Canada and Alaska (Coleoptera). Mem. Ent. Soc. Can. 142: 1-316.

Available online ($15 pay per view for non-members) at NRC Research Press:

World Catalogue of Insects, Vol. 2: Hydrophiloidea (Coleoptera).
By Hansen, M.
Apollo Books, Stenstrup, Denmark. 416 pp., 1999
Limited Perview

Hansen, M. 1999. World Catalogue of Insects, Vol. 2: Hydrophiloidea (Coleoptera). Apollo Books, Vester-Skerninge, Denmark. 416 pp.

World Catalogue of Insects is an initiative aimed at compiling worldscale, authoritative catalogues of monophyletic insect taxa.

Volumes will as a minimum contain standard nomenclatoral information on all names pertaining to the taxon treated, including type locality and distribution to the extent this is relevant.

Additional information is optional, e.

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