Adetomyrma caudapinniger

Known from a small number of males from two localities. All the specimens were collected with a malaise trap,

Identification
Yoshimura and Fisher (2012) - The male of Adetomyrma caudapinniger is distinguished easily from other Adetomyrma males by its bilobed paramere and 2,2 palpal formula. These characters, as well as those observed in the aedeagus, are unique to Adetomyrma caudapinniger, and a separation of this species from the remaining Adetomyrma species is clear and consistent. For example, Adetomyrma aureocuprea, which is superficially similar to A. caudapinniger, has a simple paramere and a 3,3 palpal formula.

Distribution based on Regional Taxon Lists
Malagasy Region: Madagascar.

Castes
Known only from the male caste.

Nomenclature

 * . Adetomyrma caudapinniger Yoshimura & Fisher, 2012b: 20, figs. 19, 33, 42, 51, 59, 68 (m.) MADAGASCAR.
 * Type-material: holotype male, 2 paratype males.
 * Type-locality: holotype Madagascar: Fianarantsoa, Miandritsara Forest, 40 km. S Ambositra, 20°47.56’S, 47°10.54’E, 822 m., 15-24.i.2007, MG-29-75, CASENT0244415, low altitude rainforest, Malaise trap (Rin’Ha, Mike); paratypes: 1 male with same data but CASENT0244416, 1 male with same data but MG-29-76, 24-31.i.2007, CASENT0244402.
 * Type-depository: CASC.
 * Distribution: Madagascar.

Male
Measurements: holotype. HL 0.57, HW 0.86, SL 0.2, EL 0.39, WL 1.48, MnW 0.93, CI 151.3, SI 23.4, EI 68.1, MnI 107.8.

HL 0.51–0.6, HW 0.71–0.88, SL 0.15–0.2, EL 0.36–0.43, WL 1.26–1.6, MnW 0.75–0.98, CI 138.6–147.5, SI 21.2–23.4, EI 66.5–71.8, MnI 103.2–111.1 (2 paratypes and 2 individuals measured).

Eye well-developed and prominent, posterior margin not exceeding the posterior margin of mid ocellus in full-face view. Distance between lateral ocellus and eye as long as or slightly longer than diameter of lateral ocellus. Palpal formula 2,2 (two maxillary and two labial). Notaulus absent on mesoscutum. Parapsidal line clearly impressed. Anterior margin of petiole shorter than dorsal margin in lateral view. Subpetiolar process developed as spinose with one to two hairs ventrally.

Left and right parameres not overlapping or narrowly overlapping on dorsal small part of basimere. Distinct lobe present on posterodorsal portion of paramere, making posterior portion appearing bilobed. Basal ring not reduced, covering whole anterior margin of paramere in lateral view. Basal projection on cuspis clear but not extraordinarily well developed. Aedeagus in lateral view slightly narrowed after ventral projection; apical margin with two distinct apices, one relatively blunt and one with a small ventral projection; posteroventral margin of ventral projection somewhat concave.

Hair on compound eyes short, less than 0.25X diameter of mid ocellus. Mesofemur in dorsal view, anterior face with dense subdecumbent hairs, and often with several longer subdecumbent hairs. Ventral margin of eye not edged with darker pigment or punctures. Body weakly bicolored, head darker than the rest of the body.

Type Material
Holotype. Male: CASENT0244415, MG-29-75: MADAGASCAR, Fianarantsoa, Miandritsara Forest, 40 km S of Ambositra, 20° 47.56´ S, 47° 10.54´ E, 822 m alt., low altitude rainforest, Malaise trap, 15–24.i.2007, Rin'ha, Mike leg. . Paratypes. 1 male: CASENT0244416, with same data as holotype [CASC]; 1 male: CASENT0244402, MG-29–76: same locality and method as holotype, 24–31.i.2007, Rin'ha, Mike leg. [CASC]

Etymology
This species name is derived from the Latin words caudapinna (tail fin) and gero (have), referring to the distinctive paramere. Pinniger can be both a noun and adjective, but is treated as a noun here, and thus invariant.

Determination Clarifications
This new species corresponds to the following species code used in previous studies: mgm05 (in part): Yoshimura & Fisher 2012.

References based on Global Ant Biodiversity Informatics

 * Yoshimura M., B.L. Fisher. 2012. A revision of the Malagasy endemic genus Adetomyrma (Hymenoptera: Formicidae: Amblyoponinae). Zootaxa 3341: 1-31.
 * Yoshimura, M., and B. L. Fisher. "A revision of the Malagasy endemic genus Adetomyrma (Hymenoptera: Formicidae: Amblyoponinae)." Zootaxa 3341 (2012): 1-31.