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) Author Kanao, Taisuke Author Maruyama, Munetoshi text Zootaxa 2015 4044 2 201 223 journal article 10.11646/zootaxa.4044.2.2 8b09a6a1-35c3-407c-a4b5-076c4af030db 1175-5326 241241 7000893A-A8BC-4196-B76D-385C97B96FBD Discoxenus katayamai Kanao & Maruyama, 2010 ( Figs. 17, 18 , 149–164 ) Discoxenus katayamai Kanao & Maruyama, 2010 : 79 . Additional materials. Cambodia : 8 sex?, 500 m S of Ankor Wat, Siem Reap, 5 VI 2012 , Maruyama M. (Colony no. MMCB-T-2012-1-001). 2♀♀, 1 km S of Angkor Wat, Siem Reap, 18 VIII 2012 , Maruyama M. leg. (Colony no. MMCB-T-2012-2-002). 3♂♂, 2♀♀, North Wall of Preah Khan, Siem Reap, 19 VIII 2012 , Maruyama M. leg. (Colony no. MMCB-T-2012-2-006) ( 1♂ , completely dissected, 1♀, abdominal segments dissected off). 2♂♂, 6♀♀, Bayon, Ankor Thom, Siem Reap, 20 VIII 2012 , Maruyama M. leg. (Colony no. MMCB-T-2012-2-008) ( 1♂ , 1♀, abdominal segments dissected off). 1♀, 1 km W of Banteay Prei, Siem Reap, 21 VIII 2012 , Maruyama M. leg. (Colony no. MMCB-T-2012-2-0016). 1♂ , 9♀♀, 1 km S of Ankor Wat, Charles De Gaulle, Siem Reap, 22 VIII 2012 , Maruyama M. leg. (Colony no. MMCB-T-2012-2-0023) (1♀, completely dissected). 3♂♂, 1♀, 2 km SE of Neak Pean, Siem Reap, 18 VIII 2014 , Kakizoe S. & Maruyama M. leg. (Colony no. SK001). 2♂♂, 2♀♀, 0.76 km NE of Preah Kham, Siem Reap, 18 VIII 2014 , Kakizoe S. & Maruyama M. leg. (Colony no. SK003). 1♀, 0.65 km N of Preah Kham, Siem Reap, 19 VIII 2014 , Kakizoe S. leg. (Colony no. SK004). 3♀♀, 0.76 km NE of Preah Kham, Siem Reap, 19 VIII 2014 , Kakizoe S. leg. (Colony no. SK008). 7♂♂, 17♀♀, 0.77 km E of Angkor Wat, Siem Reap, 24 VIII 2014 , Kakizoe S. & Maruyama M. leg. (Colony no. SK015). 2♂♂, 2♀♀, same locality data to SK002, 25 VIII 2014 , Kakizoe S. leg. (Colony no. SK019). 1♀, 1.8 km W of Neak Pean, Siem Reap, 26 VIII 2014 , Kakizoe S. leg. (Colony no. S022). Diagnosis. This species is distinct, and is easily distinguishable from other Discoxenus species by a combination of the following character states: antennal segment XI thick and approximately 1.4 times longer than wide ( Fig. 150 ), elytra and abdominal tergites sparsely covered with yellow setae ( Fig. 17 ). Redescription. Head ( Fig. 149 ) approximately 1.6 times wider than long. Antenna ( Figs. 17, 18 , 150 ) with segment I longer than other segments; segment II as long as segment III, with 3 macrosetae; segment III bowl shaped; segment IV transverse; segments V–VII wider than other segments; segments VIII–X gradually narrowed distally; segment VIII slightly wider than long; segments IX–X subquadrate; segment XI approximately 1.4 times longer than wide, widest around middle. Labrum ( Fig. 151 , left side) with anterior margin slightly concave at middle; median projection of apodeme short, with apex rounded; 4–5 lateral setae present in ventral view ( Fig. 151 , right side). Mandibles ( Figs. 152, 153 ) covered with 15–20 pores. Left mandible ( Fig. 152 ) with adoral margin moderately pointed around middle. Right mandible ( Fig. 153 ) with a distinct tooth. Maxillary palpal segment III approximately 2 times longer than wide. Mentum ( Fig. 154 ) approximately 2.8 times wider than long, covered with around 40 pores. Labium with prementum covered with approximately 6 pores. Pronotum ( Fig. 155 ) covered with approximately 48 macrosetae. Elytron ( Fig. 156 ) transverse, sparsely covered with yellow setae, 14 macrosetae present on disc. Metaventrite approximately 1.6 times longer than mesoventrite. Tergites ( Fig. 17 ) and sternites ( Fig. 18 ) sparsely covered with yellow setae. Tergite VIII ( Fig. 157 ) with posterior margin rounded, 3 pairs of macrosetae present at posterior margin, with 2 pairs of macrosetae around middle. Macrochaetotaxy of abdominal tergites III–VIII = 6, 6, 6, 6, 6, 6. Sternites III–VII ( Fig. 18 ) with 4–8 macrosetae at posterior margin. Male. Sternite VIII ( Fig. 158 ) with posterior margin slightly rounded, 3 pairs of macrosetae present at posterior margin, with 2 pairs of macrosetae at middle. Median lobe of aedeagus narrowed apically in ventral view ( Fig. 161 ); basal capsule with distal crest large in lateral view ( Fig. 134 ); apical lobe less than half as wide as basal capsule in lateral view ( Fig. 162 ). Paramere ( Fig. 163 ) with paramerite approximately 3 times wider than condylite; velar sac sclerite with 7–8 setae; apical lobe with 2 minute setae at apex. Female . Sternite VIII ( Fig. 159 ) with 2 pairs of macrosetae at posterior margin and middle, respectively. Spermatheca ( Fig. 164 ) with basal part more than 3 times longer than apical part. Measurement. Body length = average 1.52 mm ( 1.46–1.58 mm , N = 10), pronotal length = average 0.52 mm ( 0.49–0.56 mm , N = 10), pronotal width = average 0.74 mm ( 0.71–0.78 mm , N = 10), elytral length = average 0.38 mm ( 0.36–0.41 mm , N = 10), elytral width = average 0.41 mm ( 0.39–0.44 mm , N = 10). Host species. Odontotermes proformosanus Ahmad, 1965 . Comments. This species was originally described from Thailand ( Kanao & Maruyama 2010 ). The close morphological comparisons revealed that there are only a few morphological differences between the Thai and the Cambodian specimens: the elytra of the Cambodian specimens are slightly wider than that of the Thai specimens; the Cambodian specimens have a slightly broader distal crest of the median lobe. We, therefore, consider these populations as conspecific. In this paper, we have redescribed this species to include additional morphological details.