Batricavus tibialis Yin & Li, 2011

Yin, Zi-Wei, Li, Li-Zhen & Zhao, Mei-Jun, 2011, Batricavus tibialis, a new genus and species of Batrisini from South China (Coleoptera: Staphylinidae: Pselaphinae), Acta Entomologica Musei Nationalis Pragae 51 (2), pp. 529-534 : 532-534

Batricavus tibialis Yin & Li sp. nov.

( Figs. 1–18 )

Type locality. Souh China, Guangdong Province, Nankunshan Nature Reserve.

Type material. HOLOTYPE: J, ‘ CHINA: GUANGDONG Prov. / Longmen County / Nankunshan N. R. / 20.viii.2010, alt. 700 m / Li-Zhen LI leg.’ ( SNUC) . PARATYPES: 1 J 1 ♀, ‘ CHINA: GUANGDONG Prov. / Shaoguan City / Nanling National N. R. / 9.viii.2010 / Li-Zhen LI leg.’ ( SNUC).

Diagnosis. Relatively small sized, length 1.57–1.78 mm.Antennal club four-segmented in the male, strongly modified, three-segmented and weakly-defined in the female. Male protibiae modified at lateral margin at apical one-third. Male metaventrite with rows of long modified apical setae. Aedeagus with a reduced basal bulb, dorsal apophysis simple. Female genitalia composed of a membranous and transverse sternite IX, fore lobe with a pair of ventral processes, and a transverse genitial plate.

Description. Male. Body ( Fig. 1 ) yellowish brown, maxillary palpi and tarsi lighter. BL 1.57–1.66 mm. Head ( Figs. 3–4 ) slightly wider than long, HL 0.33–0.36 mm, HW 0.39–0.44 mm. Eyes well-developed, each composed from about 30 large facets. Antennomere VIII ( Fig. 6 ) transverse, IX about as wide as VIII and about as long as wide, X much longer than IX, narrowed at base, widest at middle, XI nearly fusiform, as long as X. Pronotum ( Fig. 5 ) with sides round, slightly wider than long, PL 0.37–0.39 mm, PW 0.40–0.43 mm. Elytra combined wider than long, EL 0.53–0.56 mm, EW 0.64–0.72 mm; discal area convex, basal part slightly depressed. Hind wings fully developed. Metaventrite ( Fig. 7 ) with pair of rows of long setae in apicomedian part. Protibiae ( Fig. 8 ) modified in apical 1/3, with projections outwards. Abdomen narrower than elytra, AL 0.34–0.35 mm, AW 0.56–0.60 mm. Tergite VIII ( Fig. 9 ) emarginated on posteromedian margin. Sternite VIII ( Fig. 10 ) transverse. Sternite IX ( Fig. 13 ) semi-membranous, semi-circular, with several long setae at apex. Aedeagus ( Figs. 16–18 ) well-sclerotized, length 0.28 mm; basal bulb short with small ventral process and small basal foramen; ventral stalk widest at apical 2/3, acute and curved mesally at apex; dorsal apophysis situated at right half, longer than ventral stalk, slender; lamellar sclerite orientated from base of ventral stalk, hemi-membranous and broad.

Female. Similar to male in general aspect; darker in color; wingless. BL 1.78 mm, HL 0.35 mm, HW 0.40 mm. Eyes smaller than in male, each composed from about 25 large facets. Terminal three segments of antennae loosely clubbed, not modified. PL 0.38 mm, PW 0.40 mm; EL 0.55 mm, EW 0.66 mm. Metaventrite lacking rows of long setae. Legs not modified. AL 0.50 mm, AW 0.60 mm. Female genitalia ( Figs. 17–18 ) wider than long, maximum length 0.17 mm, maximum width 0.24 mm, composed of three parts. Hind lobe (sternite IX) transverse, semi-membranous, extending laterally; fore lobe with pair of long ventral sclerites separated from each other; genital plate as long as hind lobe, with pair of lateral arms thick at apices.

Etymology. The specific name refers to the sexually modified protibiae in the male.

Habitat. All individuals of Batricavus tibialis were sifted from mixed leaf litter of a broadleaved forest.

Distribution. Guangdong Province (South China).

Figures

Figs. 1–2. Dorsal habitus of Batricavus tibialis Yin & Li, gen & sp. nov. 1–male; 2–female.

Figs. 3–8. Details of Batricavus tibialis Yin & Li, gen. & sp. nov., male. 3 – head, in dorsal view; 4 – same, in ventral view; 5 – pronotum; 6 – antennal club; 7 – meso- and metaventrite; 8 – protibia. Abbreviations: as – antebasal sulcus; gc – gular carina; gf – gular foveae; ibef – inner basolateral foveae; laf – lateral antebasal foveae; lls – lateral longitudinal sulcus; lmcf – lateral mesocoxal foveae; lmsf – lateral mesoventral foveae; lmtf – lateral metaventral foveae; mls – median longitudinal sulcus; mvs – metaventral setae; obef – outer basolateral foveae; sai – subanterior impressions; vf – vertexal foveae; vs – vertexal sulcus. Scales: 0.2 mm.

Figs. 9–18. Details of Batricavus tibialis Yin & Li, gen. & sp. nov. 9 – male tergite VIII; 10 – male sternite VIII; 11 – female tergite VIII; 12 – female sternite VIII; 13 – male sternite IX; 14 – aedeagus, dorsal view; 15 – same, lateral view; 16 – same, ventral view; 17–18 – female genitalia, ventral view. Abbreviations: bb – basal bulb; bf – basal foramen; da – dorsal apophysis; fl – fore lobe; gp – genital plate; hl – hind lobe; ls – lamellar sclerite; vs – ventral stalk. Scales: 0.1 mm, scale with ‘*’=0.05 mm).