Cercyon armatipenis, Arriaga-Varela, Emmanuel, Seidel, Matthias, Deler-Hernandez, Albert, Viktor Senderov, & Fikacek, Martin, 2017

Arriaga-Varela, Emmanuel, Seidel, Matthias, Deler-Hernandez, Albert, Viktor Senderov, & Fikacek, Martin, 2017, A review of the Cercyon Leach (Coleoptera, Hydrophilidae, Sphaeridiinae) of the Greater Antilles, ZooKeys 681, pp. 39-93: 46-48

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scientific name

Cercyon armatipenis

sp. n.

Cercyon armatipenis  sp. n. Figures 1 d–f, 5 i–l, 9 a–d, 15a

DNA barcodes.

GANTC013-17, GANTC014-17



Figures on Flickr.


Type locality.

Dominican Republic, Independencia Province, Parque Nacional Sierra de Neiba, 11.3 km NW of La Descubierta, 18°39.81'N, 71°46.17'W, 1650 m a.s.l.

Type material.

Holotype (male): "DOMINICAN R.: Independencia, PN Sierra de Neiba, 11.3 km NW of La Descubierta; 1650 m, 18°39.81'N, 71°46.17'W; 18.viii.2014, Deler, Gimmel DR13 // disturbed montane cloud forest with many ferns and mosses: in cow excrement" ( NMPC). Paratypes: DOMINICAN REPUBLIC: Independencia: same label data as the holotype (2 males: NMPC; 1 male: BMNH; 1 male: SBNM) [DNA extractions MF1264.5, MF1264.6 in NMPC].


Externally identical with other members of the Cercyon gimmeli  species group, it may be only distinguished from them by the morphology of the aedeagus (Fig. 5 i–l): parameres as long as phallobase; median lobe moderately wide basally, narrowing apicad, with spines in apical fifth, apex finely truncate.


Measurements. (Fig. 1 d–f) 3.0-3.7 mm long (length of holotype: 3.45 mm); 1.8 –1.9× as long as wide, 3.2 × as long as high (height of holotype: 1.15 mm).

Conforming to the description of C. gimmeli  , with the following differences: Pterothorax. Punctation of even intervals consisting of small non-setiferous punctures, but here and there with infrequent crescent-shaped larger setiferous punctures; only lateralmost elytral interval completely pale.

Male genitalia. Median projection of sternite 9 (Fig. 5l) moderately wide, slightly widening apically, with few subapical setae. Phallobase (Fig. 5i) as long as parameres, asymmetrically narrowing basally, base narrowly rounded. Parameres wide basally, gradually narrowing towards apex, sinuate on outer face near apex, apex rounded, with 3 apical and few subapical setae. Median lobe (Fig. 5j) wide basally, gradually narrowing towards apex; (Fig. 5k) apex finely truncate, with numerous backward-directed spines on dorsal and lateral surfaces; gonopore large, subapical; basal portion with dorsal plate simply bifid.


The species name is derived from Latin words armatus (armed) and penis (penis), in reference to the diagnostic character of this species, i.e. the apex of the median lobe armed by small spines.


Dominican Republic: Independencia (Fig. 15a).


Specimens were collected in cow dung in a cloud forest.