Loeblibatrus Yin, 2018

Yin, Zi-Wei, 2018, Loeblibatrus Yin, a New Genus of Myrmecophilous Pselaphinae (Coleoptera: Staphylinidae) from Southern China, The Coleopterists Bulletin 72 (2), pp. 233-240 : 234-237

Loeblibatrus Yin , new genus

Zoobank.org/ urn:lsid:zoobank.org:act:E903CB14-8650-4498-A60E-FFDE332C14EF ( Figs. 1–3 )

Type Species. Loeblibatrus yunnanus Yin , new species, by monotypy.

Diagnosis. Medium-sized batrisite with the following features: pronotum and elytra strongly

constricted at base ( Fig. 1A ); dorsal surface of body and antennae regularly covered with thick, suberect, t spatulate setae ( Fig. 1A ); head ( Fig. 1B ) subtriangular, dorsum lacking carinae, sulci, frontal fovea, and rostrum; vertex with pair of small, glabrous foveae; antennal tubercles only slightly raised. Pronotal disc ( Fig. 1B ) moderately convex, lacking sulci, spines, or foveae. Paranotal sulci or carinae lacking. Elytra ( Fig. 2F ) lacking basal foveae and discal striae; disc ( Fig. 3A ) strongly convex, elevated above plane of pronotum. Abdominal tergites IV and VII ( Fig. 1C ) elongate, subequal in length, V and VI much shorter than IV.

Description. Medium-sized, length 1.85–1.89 mm. Head ( Fig. 1B ) subtriangular, narrowed apically; lacking frontal rostrum and frontal fovea; anterior margin of labrum ( Fig. 2C ) with 4 short, blunt, specialized setae; antennal tubercles low, area between them slightly depressed; vertexal foveae glabrous and small, located much below level of posterior margins of eyes; lacking sulcus connecting vertexal foveae; short, median, longitudinal carina barely traceable. With 11 antennomeres ( Fig. 2D ), antennal club indistinct; head with thin ocularmandibular carinae ( Fig. 2B ); eyes small, semicircular; maxillary palp with minute palpomere I, elongate palpomere II pedunculate basally, palpomere III short and triangular, palpomere IV nearly fusiform, obliquely conjoined with III at base; gular area ( Fig. 2A ) weakly depressed medially, with 2 small foveae, gular carina only faintly indicated posterior to mouthparts. Pronotum ( Fig. 1B ) with round lateral margins, narrowed at anterior margin and strongly constricted at base; pronotal disc lacking sulci, spines, foveae, and paranotal carinae; with small lateral procoxal foveae ( Fig. 2E ). Elytra ( Fig. 2F ) strongly narrowed at base, disc strongly convex; lacking basal foveae, discal striae, sutural striae, subhumeral foveae, and marginal striae. Metathoracic wings fully developed. Mesoventrite ( Fig. 2G ) with forked lateral foveae, anterior pair of forks thinner than posterior pair, median foveae within shared opening, widely separated anteriorly; lateral mesocoxal foveae present; lacking lateral metaventral foveae ( Fig. 2G ); metacoxae moderately separated; posterior margin of metaventrite with narrow, deep median slit ( Fig. 2G ). Abdominal tergites IV (first visible tergite) and VII ( Fig. 1C ) longest, subequal in length; tergites V and VI much shorter than IV; tergite IV lacking discal carinae, basal sulcus usually covered by elytra, lacking basolateral foveae in sulcus; tergites V and VI lacking basolateral foveae, VII with 2 indistinct lateral foveae. Sternite IV lacking basal sulcus, with 4 pairs of basolateral foveae; sternites V–VII each with 1 pair of indistinct basolateral foveae.

Males lacking obvious secondary sexual modifications except slightly larger eyes. Aedeagus ( Fig. 2H–I ) asymmetrical, parameres fused with median lobe. Female genital complex ( Fig. 2J ), weakly sclerotized, transverse.

Etymology. The new generic name is dedicated to Ivan Löbl (Geneva, Switzerland), a renowned entomologist in beetle systematics and taxonomy, and combined with an arbitrary abbreviation of Batrisus Aubé , the type genus of the Batrisitae . Gender is masculine.

Loeblibatrus yunnanus Yin , new species Zoobank.org/ urn:lsid:zoobank.org:act:B5561AF9-9574-47B8-9900-8E5D6D636638 ( Figs. 1–3 )

Type Material. 2 ³³, 8 ♀♀. Holotype: CHINA: ³, labeled “China: Yunnan, Baoshan City (保山市), Tengchong County (腾冲县), Mingguang Town (明光镇), Zizhi Villege (自治村), 25°42′29″N, 98°35′02″E, 2300 m, 30.iv2013, Dai, Song, Peng leg. [one Ectomomyrmex Mayr ant pinned under holotype]” (in SNUC) . Paratypes: CHINA: 1 ³ , 4 ♀♀, same collecting data as the holotype (one ♀ paratype was cleared and completely disarticulated and preserved in Euparal on plastic slides) ; 1 ♀, also from Zizhi , except “ 25°42′48″N, 98°34′53″E, 2183 m, 27.iv2013 ” ; 1 ♀, also from Zizhi , except “ 25°42′55″N, 98°34′52″E, 2100 m, 1.v.2013, X.B. Song leg.” ; 2 ♀♀, labeled “ China: Yunnan, Lincang City (临沧市), Yun County (云县), Manwan Town (漫湾镇), Caozidi Villege (草子地村), 24°40′27″N, 100°23′09″E, 1757 m, 2.iv.2016, Zi-Chun Xiong leg.” (all in SNUC) .

Diagnosis. As for the genus (vide supra), plus antennomeres I–VII each elongate,VIII–X subquadrate, and aedeagus with apically narrowed median lobe.

Description. Male ( Fig.1A ). BL = 1.85–1.89 mm. Body reddish brown, maxillary palpi and tarsi lighter in color. Head ( Figs. 1B , 2A–B ) subtriangular, HL = 0.35–0.36 mm, HW = 0.38 mm; surface with squamous microsculpture; vertex slightly convex, foveae below level of posterior margins of eyes, faint median carina extending from head base for short distance, ending at level of posterior margin of eyes; eyes ( Figs. 1B , 2B ) small, semicircular, each composed of about 30 small facets; postocular margins longer than eye length, rounded, narrowing from eyes toward base; antennomeres ( Fig. 2D ) I–VII each elongate, VIII–X subrectangular, XI largest. Pronotum ( Fig. 1B ) with round lateral margins, slightly wider than long, PL = 0.37–0.38 mm, PW = 0.39–0.40 mm, disc with squamelliform microsculpture. Elytra subtrapezoidal, strongly constricted at base; slightly wider than long, EL = 0.66–0.69 mm, EW = 0.71–0.73 mm; foveae and striae totally reduced. All legs elongate, simple. Abdomen wider than long, AL = 0.46–0.47 mm, AW = 0.62–0.65 mm, narrowed posteriorly. Aedeagus ( Fig. 2H–I ) elongate, length 0.25 mm, with large basal capsule and apically narrowed median lobe.

Female. Externally similar to male, except eyes slightly smaller than in male, each composed of about 25 facets. Measurements: BL = 1.84–1.93 mm; HL = 0.36–0.37 mm; HW = 0.37–0.38 mm; PL = 0.38 mm; PW = 0.41 mm; EL = 0.67–0.70 mm; EW = 0.73–0.75 mm; AL = 0.42– 0.09 mm; AW = 0.66–0.70 mm; width of genital complex ( Fig. 2J ) = 0.25 mm.

Host Ant. Ectomomyrmex sp. ( Fig. 3C ; identified by Hao Ran).

Distribution and Habitat. This species is currently known only from western Yunnan, China ( Fig. 3B ). All individuals from Tengchong were collected in colonies of an Ectomomyrmex ant beneath stones ( Fig. 3D ).

Etymology. The new species is named after Yunnan Province, where the type locality is located.

Figures

Fig. 1. Loeblibatrus yunnanus, male. A) Dorsal habitus, B) Head and pronotum, C) Abdomen, dorsolateral view, showing spatulate setae. Scale bars = 0.5 mm in A; 0.2 mm in B–C.

Fig. 2. Diagnostic features of Loeblibatrus yunnanus (A–G, J: female, H–I: male). A) Head, ventral view, B) Head, lateral view, C) Labrum, showing presence of four thickened setae (arrows) at the anterior margin, D) Left antenna, E) Prosternite, F) Left elytron, G) Meso- and metaventrites, H) Aedeagus, dorsal view, I) Aedeagus, lateral view, J) Genital complex. Abbreviations: cl = clypeus; gf = gular fovea; la = labrum; lmcf = lateral mesocoxal fovea; lmsf = lateral mesoventral fovea; lpcf = lateral procoxal fovea; ma = mandible; mmsf = median mesoventral fovea; omc = ocular-mandibular carina. Scale bars = 0.2 mm in A–B, D, E–G; 0.1 mm in H–J; 0.05 mm in C.

Fig. 3. A) Loeblibatrus yunnanus, lateral habitus, B) Distribution of L. yunnanus in Yunnan, southern China, C) Host ant, Ectomomyrmex sp. (left: lateral habitus; right: head, dorsal view), D) Site where individuals were collected from an Ectomomyrmex ant colony under stones (arrows). Scale bars = 0.5 mm in A, 2 mm in C.