Hydraena orcula

Perkins, Philip D., 2011, New records and description of fifty-four new species of aquatic beetles in the genus Hydraena Kugelann from South America (Coleoptera: Hydraenidae), Zootaxa 3074, pp. 1-198 : 46

Orcula Complex

Three species are included in the Orcula Complex: H. orcula , H. pantanalensis , and H. unita . These are very small to small species (ca. 1.16–1.36 mm), which have a pronotum with or without a macula, lack a pronotal scintilla, and have small plaques ( Figs. 84–85 , 90 ). The species are grouped here on the basis of the male genitalia, which have a similar general basic shape, especially in lateral aspect, and have the basal ring with a long upper extension ( Figs. 88–89, 93). The currently known species are from the Pantanal region of southern Brazil ( H. pantanalensis and H. unita ), and from Brazil, slightly east of the other species ( H. orcula ).

Figures

FIGURE 84. Hydraena orcula, holotype, dorsal and lateral habitus, and venter.

FIGURE 85. Hydraena pantanalensis, holotype, dorsal and lateral habitus, and venter.

FIGURE 90. Hydraena unita, holotype, dorsal and lateral habitus, and venter.