Crucisternum queneyi, Girón & Short, 2018

Giron, Jennifer C. & Short, Andrew Edward Z., 2018, Three new genera of acidocerine water scavenger beetles from tropical South America (Coleoptera, Hydrophilidae, Acidocerinae), ZooKeys 768, pp. 113-158 : 118-120

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Crucisternum queneyi

sp. n.

Crucisternum queneyi sp. n. Figs 1E-H View Figure 1 ; 6J View Figure 6 ; 7 View Figure 7

Type material examined.

Holotype (male): FRENCH GUIANA: Sinnamary: "[Pripris de Yiyi]/ 25.xi.2007/ P. Queney réc.” (MNHN). Paratypes (2): FRENCH GUIANA: Roura: "[Patawa: ru]/ 19.xi.2007/ P. Queney réc.” (1, SEMC); "[N2, PK 73,5: petite crique accidentée, 250m]/ 23.xi.2007/ P. Queney réc.” (1, PQPC).

Differential diagnosis.

Crucisternum queneyi is very similar to C. ouboteri and C. vanessae in the sharpness of the punctation and the general coloration of the body (compare Fig. 1E-H View Figure 1 to Fig. 2 View Figure 2 ). It can be readily recognized by the pear-shaped aedeagus (as opposed to fusiform), with simple (as opposed to broadened) margins of the apical region of the median lobe, as well as outwardly pointing apices of the parameres (see Fig. 6J View Figure 6 ).


Body length 1.9-2.3 mm, width 1.0-1.1 mm. General coloration dark brown on elytra, slightly paler on pronotum and head (Fig. 1E View Figure 1 ). Elytra with punctures rather sharply marked. Aedeagus pear-shaped, widest along basal third; apex of parameres pointing outwards; apical third of median lobe narrower than a paramere at the base of its apical third, with simple converging margins; gonopore located near midlength of median lobe (Fig. 6J View Figure 6 ).


Named after French coleopterist Pierre Queney, who collected and beautifully prepared the known specimens of this species.


French Guiana (Roura). See Fig. 7 View Figure 7 . Collected at 250 m elevation.


This species is known from streams.