Hippeutister Reichensperger, 1935

Caterino, Michael S. & Tishechkin, Alexey K., 2008, A review of Hippeutister Reichensperger with new species from California and Costa Rica (Coleoptera: Histeridae: Hetaeriinae), Zootaxa 1895, pp. 39-52 : 41

Hippeutister Reichensperger, 1935

Solenopsister Wenzel, 1938: 318 ; Blackwelder, 1944: 186. Type species: Solenopsister amabilis .

Type species: Hippeutister solenopsidis Reichensperger, 1935: 208 (= H. manicatus Lewis ), by monotypy.

Diagnosis: Hippeutister is easily recognizable among Hetaeriinae , and almost undoubtedly monophyletic. It is most easily recognized by the broad, weakly convex prosternum with strongly divergent carinal striae, its deeply, triangularly emarginate prosternal keel, and by the correspondingly broad mesosternal projection ( Fig. 6 ). A number of other features are more unusual among neotropical Hetaeriinae , and are also useful in recognizing members of Hippeutister . They have a cylindrical, obliquely truncate antennal club ( Fig. 3 B), the frons is longitudinally depressed along inner edge of eye, resulting in a distinct ocular carina ( Fig. 7 ), the prosternum has an extra, third pair of carinal striae ( Fig. 6 ), the pronotum exhibits oblique depressions extending forward from posterior corners ( Figs. 4 , 5 ), the elytra lack striae (though they may be weakly marked by punctures or setae), and the dorsum of the elytra is margined by a strong epipleural carina ( Figs. 4 , 8 ). It is most similar to members of the genus Poneralister Bruch , which are identical in characters of the frontal carinae. The pro- and mesosternal characters of Hippeutister separate the two genera easily.

Figures

FIGURE 3. SEM photographs. A. mouthparts of Hippeutister californicus. B. Antenna of H. solisi. C. Pygidium of H. californicus. D. Pygidium of H. solisi.

FIGURE 4. Dorsal SEM photographs showing elytra. A. Hippeutister californicus. B. H. solisi, C. H. castaneus. D. H. manicatus.

FIGURE 5. Dorsal SEM photographs showing pronota. A. Hippeutister californicus. B. H. solisi, C. H. castaneus. D. H. manicatus.

FIGURE 6. Ventral SEM photographs showing sterna. A, B. Hippeutister californicus. C. H. solisi, D, E. H. castaneus. F. H. manicatus. G. H. plaumanni.

FIGURE 7. Anterior SEM photographs showing frons. A. Hippeutister californicus. B. H. solisi, C. H. castaneus. D. H. manicatus.

FIGURE 8. Lateral SEM photographs. A. Hippeutister californicus. B. H. solisi, C. H. castaneus. D. H. manicatus.