Discoxenus kohkongensis, Kanao, Taisuke & Maruyama, Munetoshi, 2015

Kanao, Taisuke & Maruyama, Munetoshi, 2015, Eight new species, a new record, and redescription of the genus Discoxenus Wasmann, 1904: The first record of termitophilous rove beetles in Cambodia (Coleoptera: Staphylinidae: Aleocharinae), Zootaxa 4044 (2), pp. 201-223 : 211-213

publication ID	https://doi.org/ 10.11646/zootaxa.4044.2.2
publication LSID	lsid:zoobank.org:pub:7000893A-A8BC-4196-B76D-385C97B96FBD
DOI	https://doi.org/10.5281/zenodo.6111783
persistent identifier	https://treatment.plazi.org/id/0395F739-FFAF-BF29-FF02-194BFCF3BDB5
treatment provided by	Plazi
scientific name	Discoxenus kohkongensis
status	sp. nov.

Treatment

Discoxenus kohkongensis View in CoL n. sp.

( Figs. 7, 8 View FIGURES 5 – 12 , 73–88 View FIGURES 73 – 88 , 165 View FIGURES 165 – 166 )

Type materials. Holotype: ♂, Koh Kong, Cambodia, 7 XII 2012, Kanao T. leg. (Colony no. KT428).

Paratypes: 2♂♂, 25♀♀, same data as holotype (1♂, completely dissected, 1♀, head and abdominal segments VIII–X dissected off).

Diagnosis. This species is distinguished from other Discoxenus species by a combination of the following four character states: macrochaetotaxy of tergites III–VIII (6, 6, 6, 6, 6, 6), sternites III–VII with macrosetae only at each posterior margin, paramere with paramerite narrow (approximately 3 times as wide as condylite) ( Fig. 87 View FIGURES 73 – 88 ), and spermatheca with short basal part (approximately 1.5 times longer than apical part) ( Fig. 88 View FIGURES 73 – 88 ). This species is most similar to D. minutus , but is distinguishable from it by a male aedeagal median lobe with apically and moderately pointed distal crest ( Fig. 86 View FIGURES 73 – 88 ).

Description. Head ( Fig. 73 View FIGURES 73 – 88 ) more than 1.3 times wider than long, with anterior margin of clypeus rounded. Antenna ( Figs. 7, 8 View FIGURES 5 – 12 , 74 View FIGURES 73 – 88 ) with segment I longer than other segments; segment II as long as segment IV, with 3 macrosetae; segment III trapezoidal, shorter than other segments; segment IV transverse; segment V wider than other segments; segments VI–XI successively narrowed distally; segments VI–VIII wider than long; segment IX subquadrate; segment X longer than wide; segment XI approximately 2.2 times longer than wide, narrowed apically. Labrum ( Fig. 75 View FIGURES 73 – 88 , left side) with anterior margin concave; median projection of apodeme broadly rounded; 4 lateral setae present in ventral view ( Fig. 75 View FIGURES 73 – 88 , right side). Mandibles ( Figs. 76, 77 View FIGURES 73 – 88 ) with 2 scrobal setae, covered with approximately 30 pores. Left mandible ( Fig. 76 View FIGURES 73 – 88 ) with adoral margin bisinuate. Right mandible ( Fig. 77 View FIGURES 73 – 88 ) with a distinct tooth. Maxillary palpal segment III approximately 2 times longer than wide. Mentum ( Fig. 78 View FIGURES 73 – 88 ) short, approximately 3.2 times wider than long, covered with around 20 pores. Labium with prementum covered with 6– 7 pores.

Pronotum ( Fig. 79 View FIGURES 73 – 88 ) sparsely covered with approximately 46 macrosetae, few minute setae present around anterior margin. Elytron ( Fig. 80 View FIGURES 73 – 88 ) transverse, sparsely covered with pores, several setae present at anterolateral outer corner, 12 macrosetae present on disc. Metaventrite approximately 1.5 times as long as mesoventrite.

Tergites III–IV ( Fig. 7 View FIGURES 5 – 12 ) covered with few setae laterally. Tergites V–VIII with posterior half covered with several setae. Tergite VIII ( Fig. 81 View FIGURES 73 – 88 ) with posterior margin pointed, 3 pairs of macrosetae present at posterior margin, 2 pairs of macrosetae present around middle. Macrochaetotaxy of abdominal tergites III–VIII = 6, 6, 6, 6, 6, 6. Sternite III ( Fig. 8 View FIGURES 5 – 12 ) sparsely covered with setae. Sternites IV–VIII with a row of yellow setae at middle. Sternites III–VII with 6–10 macrosetae at posterior margin.

Male. Sternite VIII ( Fig. 82 View FIGURES 73 – 88 ) with posterior half covered with few setae, 2 pairs of macrosetae present at posterior margin and middle. Median lobe of aedeagus narrowed toward apical lobe in ventral view ( Fig. 85 View FIGURES 73 – 88 ); basal capsule slightly concave at middle, with distal crest moderately pointed apically in lateral view ( Fig. 86 View FIGURES 73 – 88 ); apical lobe less than half as wide as basal capsule in lateral view ( Fig. 86 View FIGURES 73 – 88 ). Paramere ( Fig. 87 View FIGURES 73 – 88 ) with paramerite narrow, approximately 3 times as wide as condylite; velar sac sclerite with 4–5 setae; apical lobe with 2 minute setae at apex.

Female. Sternite VIII ( Fig. 83 View FIGURES 73 – 88 ) with 2 pairs of macrosetae at posterior margin and middle. Spermatheca ( Fig. 88 View FIGURES 73 – 88 ) with basal part approximately 1.5 times longer than apical part.

Measurement. Body length = average 1.40 mm (1.38–1.50 mm, N = 10), pronotal length = average 0.47 mm (0.41–0.51 mm, N = 10), pronotal width = average 0.70 mm (0.67–0.73 mm, N = 10), elytral length = average 0.32 mm (0.28–0.36 mm, N = 10), elytral width = average 0.36 mm (0.33–0.41 mm, N = 10).

Etymology. The specific Lathinized epithet is derived from its type locality of Koh Kong Province.

Host species. Hypotermes makhamensis Ahmad, 1965 .