Aegognathus Leuthner, 1883

Ríos-Málaver, Juan Sebastián Dueñas Cáceres ı Cristóbal & Grossi, Paschoal Coelho, 2019, Taxonomic contribution on the Andean species of Aegognathus (Coleoptera: Lucanidae) with two new species from Colombia and Peru, Journal of Natural History 53 (35), pp. 2145-2164 : 2154-2155

Key to Andean Region Aegognathus Leuthner species

1. Body apparently uniformly black, at least along head and pronotum but showing some small dark-red spots ventrally and dorsally with bluish or reddish reflections along elytra. ........................................................................................................................................... 2.

Body with distinctly black and red to orange spots. ............................................................. 4.

2. Last Ventrite with two conical tubercles at both sides, and dense yellowish setae. Male aedeagi slender, strongly sclerotised, with setose median lobe at sides, X shaped dorsal cross bar presenting two acuminate projections near the median axis. Female unknown. ............................................... ............................................... A. waterhousei Leuthner.

Last ventrite with no lateral tubercles, presenting or not a somewhat continuous lateral carina along abdominal ventrites. Different genitalia. ............................................ 3.

3. Elytra showing bluish reflections and reddish longitudinal costae. Mandibles with a dorsal, basal carina, inner margin wavy. Median tooth almost triangular, apex emarginate, slightly bifurcated. Aedeagus short, weakly sclerotised, with a somewhat flatı short everted sac. Female unknown. ................... ................... A. dulima .

Body mainly black. Mandibles not wavy internally, and with no dorsal carina at base. Females entirely black, sometimes showing bluish reflections along elytra; elytra entirely punctate, with no traces of carina; left mandible showing a transverse laminar tooth presenting one bigger pit and two smaller at base. Abdominal ventrites presenting a lateral longitudinal carina, bordered, resembling a continuous line along lateral margins. Male genitalia elongate, somewhat slender, strongly sclerotised, presenting a cylindrical and somewhat long internal sac. .................. .................. A. arnaudi .

4. Heads as wide as elytra, mandibles somewhat cylindrical, strongly curved inwards with a media tooth pointing upwards in major males (not present or reduced in small specimens), females with laminar median tooth; Ocular canthus angulated, especially in females, sometimes rounded sometimes emarginate. ................................................... 5.

Males with head and pronotum robust, wider than elytra. Mandibles short, wide and somewhat flattenedı rectangular in cross section, all teeth pointing to the median axis of the body, never longer than mandible width; females with ocular canthi distinctly rounded. Gena strongly carinate in males and strongly punctate in females. Male genitalia with an internal sac subconical at apex, medially concave. ................................... ............................................................................................................ A. aguirei Arnaud & Bomans.

5. Body entirely bicoloured, with black and orange marks. Elytra presenting 2 – 4 orange longitudinal striae, some costae. Male genitalia with parameres apically rounded, dorsally with concave posterior margin. ............................ A. soulai Arnaud & Bomans.

Body bicoloured with black and dark red spots. Elytra without distinct costae, even with longitudinal red striae. Genitalia different from above .............................................. 6.

6. Male mandibles with truncate apex, dorsal angle slightly elongate, rounded; preapex in medium and major males with a small tooth. Female mandibles dorsally carinate along the external and internal margins; ocular canthi quadrate. Male second abdominal ventrite without transverse wrinkles along lateral margins. ............................................. .............................................................................................................. A. similis Arnaud & Bomans.

Mandibles with rounded or acuminate apex, second, or second and third abdominal ventrites presenting wrinkles along lateral margins. ............................................................. 7.

7. Second and third abdominal ventrites presenting transverse wrinkles. Elytra uniformly punctate, punctures elongate to coalescent; colour pattern almost uniform from darkish red to black with no distinct area of costate or subcostate striae. ......................... ........................................................................................................ A. confusus Arnaud & Bomans.

Only second abdominal ventrite with transverse wrinkles. Elytra bicoloured, with punctures not uniformly distributed, sometimes with longitudinal costae; elytral punctures circular and coalescent. ................................................................................................ 8.

8. Male mandibles more abruptly incurved, with a somewhat sharp apex, with a preapical transverse longitudinal carina. Pronotum and elytra showing distinctly long yellowish setae, densely distributed along elytra; setae longer than twice a puncture diameter; setae in females distinctly broader. Female elytra with disc bicoloured. Male genitalia with X shaped; dorsal cross bar poorly lobed, but broader at posterior portion. .............................................................. A. damasoi Arnaud & Bomans.

Male mandibles gradually incurved, with truncate to rounded apex, preapical carina absent. Yellowish setae mainly along elytra, but short, as long as a punctate diameter. Female elytral disc almost uniformly black, setae slender, hair-like. Male genitalia with X-shaped dorsal crossbar with broader posterior lobes. ...... A. leuthneri Van de Poll.