Zyras (Zyras) parvilobatus, Assing, 2017

Assing, Volker, 2017, On Zyras sensu strictu in the East Palaearctic and Oriental regions III, with a focus on the Southeast of Continental Asia and the Sunda Islands (Coleoptera: Staphylinidae: Aleocharinae: Lomechusini), Beiträge Zur Entomologie = Contributions to Entomology 67 (2), pp. 213-246 : 236-237

Zyras (Zyras) parvilobatus spec. nov.

urn:lsid:zoobank.org:act:6DBB36A1-C12B-4FA1-B28E-55560D6645C6

( Figs 10 , 28 , 43 , 87–89 )

Type material examined: Holotype ♂: “N LAOS, 1300– 1500 m, Phongsali Prov., Phongsali env. , 2004, 1–15 May, Lao collector leg. / Holotypus ♂ Zyras parvilobatus sp. n., det. V. Assing 2017 ” (cMar). Paratype: 1 ♀: same data as holotype (cAss) .

Etymology: The specific epithet is an adjective alluding to the relatively small ventral process of the aedeagus.

Description: Body length 5.8–6.5 mm; length of forebody 2.7–2.9 mm. Coloration ( Figs 10 , 28 , 43 ): forebody blackish with the humeral and anterior portions of the elytra reddish-yellow; abdomen black with the posterior margins of the tergites more or less distinctly paler reddish; legs yellowish; antennae blackish with the apical portion of antennomere XI sometimes paler brown; maxillary palpi brown with the apical palpomere yellowish-red.

Head ( Fig. 28 ) distinctly transverse; punctation moderately coarse and moderately sparse; along middle without punctation. Eyes large, much longer than postocular region in dorsal view. Antenna ( Fig. 10 ) 1.9–2.1 mm long and moderately massive; antennomeres IV–V weakly oblong to weakly transverse, VI as long as broad or weakly transverse, VII–X weakly transverse, X less than 1.5 times as broad as long, and XI slightly longer than the combined length of IX and X.

Pronotum ( Fig. 28 ) strongly transverse, 1.23–1.30 times as broad as long and 1.34–1.35 times as broad as head, broadest near anterior angles; posterior angles weakly, obtusely marked; lateral margins not sinuate in posterior half in dorsal view; punctation moderately coarse and moderately dense, regularly distributed; midline with or without narrow and somewhat irregular narrow impunctate band.

Elytra ( Fig. 28 ) 0.82–0.85 times as long as pronotum; punctation rather dense and coarse, denser near scutellum than in posterior portion. Hind wings present. Metatarsomere I approximately as long as the combined length of II–IV.

Abdomen ( Fig. 43 ) slightly narrower than elytra, with moderately deep anterior impressions on tergites III–V; tergites III–V each with a somewhat irregular transverse row or band of moderately coarse non-setiferous punctures in anterior impressions, with a lateral setiferous puncture on either side and with 4–6 setiferous punctures at posterior margins; tergite VI with a transverse band of rather sparse non-setiferous punctures anteriorly, with a transverse row of sparse setiferous punctures in posterior portion, and with six setiferous punctures at posterior margin; tergite VII with a transverse band of sparse non-setiferous punctures anteriorly and with two transverse rows of setiferous punctures posteriorly, posterior margin with palisade fringe; tergite VIII with setiferous punctures only in posterior fourth, posterior margin with sharply delimited concavity in the middle.

♂: sternite VIII with strongly convex posterior margin; median lobe of aedeagus ( Figs 87–88 ) approximately 0.7 mm long; ventral process short in relation to capsule; paramere ( Fig. 89 ) 0.8 mm long, apical lobe short and with four long dark setae.

♀: posterior margin of sternite VIII shallowly concave in the middle.

Comparative notes: Zyras parvilobatus is difficult to distinguish from the extremely similar, syntopic Z. wei based on external characters alone. The only reliable diagnostic characters are the distinctive shape of the median lobe of the aedeagus and the much shorter apical lobe of the paramere.

Distribution and natural history: The type locality is situated near Phongsali in North Laos at an altitude of 1300–1500 m. Zyras rutrilobatus and Z. wei were found in the same locality.

Figures

Figs 1–26: Antenna (1–18) and forebody (19–26) of Zyras spp. (1–17, 19–26) and Myrmedonota modiglianii (18): punctipennis, holotype (1, 19); facundus, lectotype (2, 24); latibasalis (3, 25); kinabaluensis, holotype (4, 21); matangensis, holotype (5, 26); bryanti, holotype (6, 23); granulipennis, holotype (7); flavorufus, lectotype (8); rutrilobatus (9); parvilobatus (10); hirtiventris (11–12; 11: holotype; 12 female paratype); hlavaci (13–14; 13 holotype; 14 paratype from Selangor); lunatus (15); elegantulus, lectotype (16, 20); pallipyga, holotype (17, 22). Scale bars: 1.0 mm.

Figs 27–39: Forebody (27–33), abdomen (34–38), and median portion of tergite VIII (39) of Zyras spp.: flavorufus, lectotype (27); parvilobatus (28); lunatus (29); granulipennis, holotype (30); rutrilobatus (31); hirtiventris (32); hlavaci, holotype (33); punctipennis, holotype (34); elegantulus, lectotype (35); facundus, lectotype (36); pallipyga, holotype (37); bryanti, holotype (38); latibasalis (39). Scale bars: 27–38: 1.0 mm; 39: 0.2 mm.

Figs 40–52: Abdomen (40–49, 52), abdominal tergite VI (50), and forebody (51) of Zyras spp. (40–50) and Myrmedonota modiglianii (51–52): latibasalis (40); matangensis, holotype (41); flavorufus, lectotype (42); parvilobatus (43); kinabaluensis, holotype (44); rutrilobatus (45); granulipennis, holotype (46); lunatus (47); hlavaci, holotype (48); hirtiventris, holotype (49–50). Scale bars:1.0 mm.

Figs 87–102: Zyras parvilobatus (87–89), Z. hlavaci (90–95; 90–92: holotype; 93–95: paratype from Selangor), Z. hirtiventris, holotype (96–98), Z. lunatus (99–101), and Myrmedonota modiglanii (102): median lobe of aedeagus in lateral and in ventral view (87–88, 90–91, 93–94, 96–97, 99–100); paramere (89, 92, 95, 98, 101); spermatheca (102). Scale bars: 87–101: 0.5 mm; 102: 0.1 mm.