Cercyon

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Taxonavigation

Ordo: Coleoptera
Familia: Hydrophilidae

Name

Cercyon Leach, 1817 – Wikispecies link – Pensoft Profile

• Cercyon Leach, 1817: 95. - Type species: Dermestes melanocephalus Linnaeus (designated by Thomson 1859: 19).

Diagnosis

Cercyon can be distinguished from other hydrophilid genera occurring in the Greater Antilles by the following combination of characters: antenna with compact club; prothorax with conspicuous antennal groove not reaching pronotal margin; medial part of prosternum not demarcated from lateral parts; metaventrite without arcuate lines in anterolateral corners; mesoventral plate fusiform, narrowing anteriorly and posteriorly, touching anterior margin of metaventrite in one point.
Cercyon species are very similar to the members of Pelosoma, a Neotropical genus that is recorded from the Lesser Antilles; Pelosoma differs from Cercyon by the mesoventral plate widely contacting the metaventrite (it only narrowly contacts it in Cercyon). Small species of Cercyon may resemble the members of Oosternum, which can be easily distinguished from Cercyon by possessing a metaventrite with an arcuate ridge delimiting its anterolateral corner, and in some species also by elevated median part of the prosternum.

Key to the Greater Antilles species of Cercyon

Key to the Greater Antilles species of Cercyon — E. Arriaga-Varela , M. Seidel , A. Deler-Hernández , . Viktor Senderov , M. Fikáček

1		Small species, body length 1.0–2.1 mm. Metaventrite with complete femoral lines (Fig. 13d)     Cercyon nigriceps (Marsham)
–		Larger species, body length 2.3–4.1 mm. Metaventrite without femoral lines (Figs 7d, 8g, 9c, h, 10g, 11g, 12g, 13b, f)    2
2		Mesoventral plate very wide, 1.9× as long as wide (Fig. 7d). Mesoventral plate and pentagonal raised part of the metaventrite with large, deep, semicircular punctures (Fig. 7d)     Cercyon floridanus Horn
–		Mesoventral plate moderately to very narrow, 3.3–5.9× as long as wide (Figs 8f, 9c, h, 10f, 11f, 12f, 13b, e). Mesoventral plate and pentagonal raised part of the metaventrite with small and shallow punctures (Figs 8g, 9c, h, 10g, 11g, 12g, 13b, f)    3
3		Mesoventral plate wide, 3.3× as long as wide (Fig. 13a). Dorsal coloration black, with large yellow spot at elytral apex; lateral margin of elytra narrowly yellow, the yellow stripe not widened in humeral area (Fig. 2g–i)     Cercyon praetextatus (Say)
–		Mesoventral plate narrow, 5.7–6.3× as long as wide as long as wide (Figs 8f, 9c, h, 10g, 11g, 12g, 13e). Dorsal coloration variable, if elytra is black with a large yellowish spot at apex, then the yellow coloration at the lateral margin of elytra expands to humeral area    4
4		Metaventrite with raised pentagonal area markedly wide at midlength, 0.6× as long as wide (Fig. 13f)     Cercyon quisquilius (Linnaeus)
–		Metaventrite with raised pentagonal area rather narrow at midlength, 0.9–1.2× as long as wide (Figs 8g, 9c, h, 10g, 11g)    5
5		Dorsal surface of head black, with reddish-brown spot(s) at vertex. Pronotum (Fig. 4a) yellowish to dark reddish, with a large median spot and smaller spot on each side, often fused together into one large tri-lobate spot. Elytra brown with black humeral spots extending to anterior margin and suture. Prosternum with median ridge not projected ventrally at anterior margin (Fig. 12c)     Cercyon insularis Chevrolat
–		Dorsal surface of head including vertex black, anterolateral margins of clypeus yellowish. Pronotum either black with yellowish to reddish lateral margins (Figs 1a–i, g, 2a–c), or uniformly light brown (Fig. 3a–i). Elytra either more or less uniformly brown, or black with yellowish to reddish lateral and apical parts    6
6		Pronotum uniformly light brown, elytra more or less uniformly greyish-brown (Fig. 3a). First abdominal ventrite of females (Fig. 11h) with longitudinal carina prolonged into an acute spiniform setose process; longitudinal carina of male first abdominal ventrite not projected. Raised area of metaventrite comparatively wide, 0.8× as long as wide (Fig. 11g)     Cercyon spiniventris sp. n.
–		Pronotum and elytra black with pale contrasting markings (Figs 1a, c, d, f, g, i, 2a, c): pronotum black with creamy-white or reddish lateral margins; elytra black with creamy-white to reddish humeral spot, lateral margins and apical third. First abdominal ventrite of both sexes not projecting beyond posterior margin (Figs 8h, 10h). Raised area of metaventrite rather narrow, 1.1–1.2× longer than wide (Figs 8g, 9c, h)    7
7		Prosternum with median ridge forming a small rounded to weakly pointed process (Fig. 10c). Raised median area of metaventrite reaching anterior margin of metaventrite (Fig. 10g). Anterior margin of mentum emarginate medially (Fig. 10a). Apex of fifth abdominal ventrite with a triangular bulged projection in females (Fig. 10i), not modified in males. Jamaica     Cercyon sklodowskae sp. n.
–		Prosternum with median ridge forming a large rounded knob (Figs 8c, 9g). Raised median area of metaventrite not reaching anterior margin of metaventrite (Figs 8g, 9c, h). Anterior margin of mentum not emarginate medially (Figs 8a, 9a, h). Apex of fifth abdominal ventrite rounded in both sexes. Hispaniola     Cercyon gimmeli species group...8
8		Median lobe strongly acuminate at apex (Fig. 5f–g); parameres distinctly shorter than phallobase (Fig. 5e)     Cercyon taino sp. n.
–		Median lobe blunt at apex (Fig. 5c, k); parameres as long as or longer than phallobase (Fig. 5a, i)    9
9		Median lobe wide basally, narrowing apically, with large gonopore and many spines in apical fifth (Fig. 5j–k); parameres ca. as long as phallobase (Fig. 5i)     C. armatipenis sp. n.
–		Median lobe narrowly parallel–sided, with indistinct gonopore and without spines at apex (Fig. 5b–c); parameres distinctly longer than phallobase (Fig. 5a)     C. gimmeli sp. n.

Taxon Treatment

• Arriaga-Varela, E; Seidel, M; Deler-Hernández, A; Viktor Senderov, ; Fikáček, M; 2017: A review of the Cercyon Leach (Coleoptera, Hydrophilidae, Sphaeridiinae) of the Greater Antilles ZooKeys, (681): 39-93. doi

Images

Figure 1. Cercyon spp. n. a–c Cercyon gimmeli sp. n. d–f Cercyon armatipenis sp. n. g–i Cercyon taino sp. n. a, d, g dorsal habitus b, e, h ventral habitus c, f, i lateral habitus.  Figure 2. Cercyon spp. a–c Cercyon sklodowskae sp. n. d–f Cercyon floridanus Horn g–i Cercyon praetextatus Say a, d, g dorsal habitus b, e, h ventral habitus c, f, i lateral habitus.  Figure 3. Cercyon spp. a–c Cercyon spiniventris sp. n. d–f Cercyon nigriceps Marsham g–i Cercyon quisquilius Linnaeus a, d, g dorsal habitus b, e, h ventral habitus c, f, i lateral habitus.  Figure 4. Cercyon insularis Chevrolat and C. variegatus Sharp. a–i C. insularis: a–c dorsal, ventral and lateral habitus of the non-type specimen from Cuba d habitus of the holotype e labels of the holotype f–i male genitalia of non-type specimen from Dominican Republic. j–o lectotype of C. variegatus: j dorsal habitus k labels l–o male genitalia. Genital parts illustrated: f, l tegmen of aedeagus g, m median lobe of aedeagus h, n detail of apex of median lobe; i, o 9th sternite.  Figure 5. Cercyon spp. n. genitalia a–d Cercyon gimmeli sp. n. e–h Cercyon taino sp. n. i–l Cercyon armatipenis sp. n. m–p Cercyon sklodowskae sp. n. a, e, i, m tegmen of aedeagus b, f, j, n median lobe of aedeagus c, g, k, o 9th sternite.  Figure 7. Cercyon floridanus Horn a tegmen of aedeagus b median lobe of aedeagus c 9th sternite d ventral view of pterothorax.  Figure 8. Cercyon gimmeli sp. n. a mentum b prosternum c lateral view of median ridge of prosternum d detail of elytral surface f mesoventral plate g metaventrite h median ridge of first abdominal ventrite i fifth abdominal ventrite.  Figure 9. Cercyon spp. n. a–d Cercyon armatipenis sp. n. f–i Cercyon taino sp. n. a, f mentum b detail of pronotal surface c, h ventral view of pterothorax d, i detail of elytral surface g lateral view of median ridge of prosternum.  Figure 10. Cercyon sklodowskae sp. n. a mentum b detail of pronotal surface c lateral view of median ridge of prosternum d detail of elytral surface f mesoventral plate g metaventrite h median ridge of first abdominal ventrite i female fifth abdominal ventrite.  Figure 11. Cercyon spiniventris sp. n. a mentum b prosternum c lateral view of median ridge of prosternum d detail of elytral surface f mesoventral plate g metaventrite h median ridge of female first abdominal ventrite i fifth abdominal ventrite.  Figure 12. Cercyon insularis Chevrolat a mentum b prosternum c lateral view of median ridge of prosternum d detail of elytral surface f mesoventral plate g metaventrite h median ridge of female first abdominal ventrite i fifth abdominal ventrite.  Figure 13. Cercyon spp. a–b Cercyon praetextatus Say c–d Cercyon nigriceps Marsham e–f Cercyon quisquilius Linnaeus a, c, e mesoventral plate b, d, f metaventrite.