Aenictosymbia cornuta Maruyama, 2014

Maruyama, Munetoshi, Komatsu, Takashi, Katayama, Yuji, Song, Xiao-Bin & Sakchoowong, Watana, 2014, Myrmecophilous rove beetles (Coleoptera: Staphylinidae) associated with Aenictus hodgsoni (Hymenoptera: Formicidae) from Thailand, with description of two new genera and three new species, Zootaxa 3796 (2), pp. 361-373 : 365-369

Aenictosymbia cornuta Maruyama , sp. n.

( Figs. 10–32 )

Type series. Holotype, ♂, " THAI: Nakhon Ratchasima, / Khao Yai National Park, / Heaw Suwat (750 m), / 30 IX 2007, Maruyama M., / Komatsu T. & Katayama Y. / MM-AE029 // HOLOTYPE / Aenictoxenides / mirabilis / det. Maruyama, 2014" (male 8th abdominal segment and aedeagus dissected and glued on paper card together with body) ( KUM) . Paratypes, 1♂, 3♀, " THAI: Nakhon Ratchasima, / Khao Yai National Park, / Kong Kaew (700 m), / 1 X 2007, Maruyama M. / MM-AE032" ( KUM, DNP) .

Description. Body ( Figs. 10–12 ) small. Reddish brown, but head and elytra darker; mouthparts reddish yellow.

Head ( Figs. 10–14 ) with horn truncate at apex, with 12–15 macrosetae on dorsal disc. Antennae ( Figs. 10–13 ) slender, with all segments longer than wide; segment I shorter than II and III combined; segment II slightly shorter than III; segment IV–X equally in length but becoming wider toward apex; segment XI slightly shorter than IX and X combined.

Pronotum ( Figs. 10–13, 19, 20 ) constricted at basal 1/3; PL/PW= 1.53, with 12–14 macrosetae on dorsal disc and lateral margin. Elytra ( Figs. 10–13, 22 ) almost as long as pronotum, with 3 macrosetae and several minute setae.

Abdomen with convexity of sternite III ( Fig. 11 ) large, flattened ventrally, slightly notched on anterior margin in ventral view, shallowly depressed in midline; tergite VIII ( Fig. 26 ) shallowly emarginated at apex, with 4 short macrosetae; sternite VIII ( Fig. 27 ) with 5 macrosetae and 2 or 3 thin setae postero medially.

Male: Median lobe of aedeagus ( Figs. 29–30 ) with basal ridge small, serrate at apex; sclerites of internal sac dentate; apical lobe of paramere ( Fig. 31 ) long, thick, with 4 small setae.

Female: Spermatheca ( Fig. 32 ) with basal part about 3 times as long as apical part, which is slightly swollen at apex.

Measurements. BL, ca. 2.6 – 2.7; FBL, ca. 1.6 – 1.7; HW, 0.47 – 0.53; AL, 1.55 – 1.63; PL, 0.65 – 0.67; PW, 0.40 – 0.41; HTL, 0.99 – 1.02 (N=3).

Differential diagnosis. This species is similar to Aenictophila thailandica Seevers, 1965 in general appearance, but easily distinguished from it by the much smaller body. See also Diagnosis of the genus.

Etymology. The Latin adjective cornuta meaning "horned", bringing attention to a horn on the frons of the head.

Symbiotic host. Aenictus hodgsoni .

Distribution. Central Thailand.

Figures

FIGURES 10–12. Habitus of Aenictosymbia cornuta Maruyama, gen. & sp. n. 10―dorsal view; 11―ventral view; 12―lateral view.

FIGURES 13–23. Body parts of Aenictosymbia cornuta Maruyama, gen. & sp. n. 13―head, dorsal view; 14―labrum (right, epipharynx); 15―left mandible; 16―memtum; 17―labium; 18, right maxilla; 19―pronotum, dorsal view; 20―ditto, ventral view; 21―meso- and meta traces; 22―right elytra; 23―left fore leg.

FIGURES 24–32. Body parts of Aenictosymbia cornuta Maruyama, gen. & sp. n. 24―left mid leg; 25―left hind leg; 26―male tergite VIII; 27―male sternite VIII; 28―male abdominal tergites IX and X; 29―median lobe of aedeagus, lateral view; 30―ditto, apical part, ventra view; 31―paramere; 32―spermatheca.