Syndicus kampucheanus, Jałoszyński, Paweł, 2011

Jałoszyński, Paweł, 2011, New species and new records of Syndicus Motschulsky (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 2991, pp. 21-28 : 24-26

Syndicus (s. str.) kampucheanus sp. n.

( Figs. 2 , 6, 7, 10, 11 )

Type material. Holotype: CAMBODIA: 3, two labels: " CAMBODIA, 22.– 26. 1.2006 \ Mondol Kiri Prov. \ SEN MONOROM \ 12° 30' N, 107° 12' E, alt. 600m \ lgt. Bečvař S. & Fouque R. + H." [white, printed]; " SYNDICUS (s. str.) \ kampucheanus m. \ det. P. Jałoszyński, 2010 \ HOLOTYPUS " [red, printed] ( PCPH). Paratypes: 2 females, same data as holotype, each with standard yellow " PARATYPUS " label ( PCPH, PCPJ).

Diagnosis. Males and females differ from all congeners in having elytra steeply declining laterad from suture; males have uniquely shaped median lobe of aedeagus with narrow medioventral apical projection, and central complex of endophallus with darkly sclerotized, large, transverse and broadly separated lateral parts; females have regularly dome-shaped spermatheca with short conical projection surrounding insertion of ductus spermathecae.

Description. BL 3.18 mm. Body of male ( Fig. 2 ) strongly convex, dark brown; vestiture slightly lighter than cuticle.

Head broadest at large, finely-faceted and moderately convex eyes, HL 0.50 mm, HW 0.68 mm; tempora in strictly dorsal view regularly arcuate; vertex strongly transverse, regularly convex, confluent with small, convex frons; supraantennal tubercles prominent, each elongate, distinctly delimited from frons and vertex; clypeus not modified, with anterior margin slightly concave. Punctures on frons and vertex very fine, barely discernible at magnification 40x; setae sparse but very long and strongly erect. Antennae slightly shorter than 0.6 BL, slightly thickened toward apices, AnL 1.80 mm, relative lengths of antennomeres: 1.5: 1: 1.63: 1.75: 2: 2: 2: 2: 2: 1.6: 0.8.

Pronotum elongate with strongly and regularly convex trapezoid disc, broadest near anterior fifth; PL 0.98 mm, PWb 0.50 mm, PWm 0.70 mm; anterior margin convex; sides moderately strongly narrowing posteriorly and strongly constricted in posterior third; posterior collar very short, separated from disc by transverse row of four large and deep dorsal pits, additionally vertical sides of pronotum anterior to dorsal pits bear two small, shallow and slightly diffused impressions; posterior margin of pronotum nearly straight. Disc glossy, with punctures as fine as those on frons and vertex; setae thick, moderately dense, very long and erect.

Elytra in lateral view distinctly more convex than pronotum, broadest slightly anterior to middle and moderately strongly narrowing toward apices, steeply lowering laterad from suture; EL 1.70 mm, EW 1.03 mm, EI 1.66; humeral calli weakly marked; basal impression on each elytron short but distinct; punctures very small, shallow and moderately sharply marked but noticeable at magnification 40x, separated by spaces 2– 3 x as long as puncture diameters; setae about as dense as those on pronotum but slightly longer, moderately erect.

Legs long and slender; dorsal femoral groove clearly visible on entire length of femoral clava; setae on distal half of ventral surface of metafemoral clava strikingly long; all tibiae nearly straight.

Aedeagus ( Figs. 6, 7 ) relatively slender, AeL 0.70 mm; endophallus in ventral view with very broad proximal projection, very short proximal vesicle, moderately large distal vesicle, and very broad central complex, with two darkly sclerotized lateral parts, each transverse in relation to long axis of aedeagus; parameres without apical setae, slightly exceeding apex of median lobe.

Female. Externally differs from males in inconspicuous, short setae on ventral surface of metafemoral clava, slightly smaller body and slightly stouter elytra; BL 3.00– 3.05 mm; HL 0.48–0.50 mm; HW 0.65–0.68 mm; AnL 1.73 mm; PL 0.90–0.93 mm; PWb 0.48–0.50 mm; PWm 0.68–0.70 mm; EL 1.63 mm; EW 1.00– 1.03 mm; EI 1.59–1.63.

Spermatheca ( Figs. 10, 11 ) very small; SpD 0.08 mm; regularly dome-shaped in lateral view and circular in axial view; insertion of ductus spermathecae surrounded by conical projection.

Distribution. E Cambodia: Mondol Kiri Province.

Etymology. Locotypical, after the name of the Kingdome of Cambodia in the Khmer language (Preăh Réachéa Nachâk Kâmpŭchéa).

Remarks. External morphology of S. kampucheanus is relatively unremarkable and identifications must be confirmed by the examination of the unique adeagus or spermatheca. The transverse lateral parts of the central complex of endophallus are most similar to structures known in S. difficilis Jałoszyński, 2004 from Thailand; when such clearly delimited, darkly sclerotized lateral parts occur in other species, they are always elongate (i.e., parallel to the long axis of the aedeagus). However, the aedeagus of S. difficilis differs in many details, including broadly trapezoid apex of the median lobe and very slender and long proximal projection of the endophallus. The domeshaped spermatheca of S. kampucheanus is most similar to that of S. indicus Franz, 1971 , but is less convex and has the conical projection surrounding the insertion of ductus spermathecae, which S. indicus lacks. Moreover, S. indicus known from Tamil Nadu in southern India has clearly different aedeagus.

Syndicus (s. str.) paeninsularis bilobatus Jałoszy ñ ski, 2004 ( Figs. 12, 13 )

Syndicus (s. str.) paeninsularis bilobatus Jałoszyński, 2004: 48 , Figs. 16h, 18g, h, 19g –i, 27d.

Material studied: CAMBODIA: 13, 2♀, Mondol Kiri Prov., Sen Monorom, 12° 30' N, 107° 12' E, alt. 600m, 22. –26. i. 2006, Bečvař S., Fouque R., Fouque H. leg. ( PCPH, PCPJ); LAOS: 1 3, Bolikhamsai Prov., Namsanam, 12. xi. 2002, leg. T. Watanabe ( PCPJ).

Description of female. Externally females differ from males only in concave (not bilobed) clypeus, and in slightly more slender elytra; BL 2.90–2.93 mm; HL 0.48 mm; HW 0.65 mm; AnL 1.63 mm; PL 0.90–0.93 mm; PWb 0.48 mm; PWm 0.75 mm; EL 1.53 mm; EW 0.95 mm; EI 1.61.

Spermatheca ( Figs. 12, 13 ) very large; SpD 0.15 mm; nearly cylindrical in lateral view and circular in axial view; ductus spermathecae inserted directly on margin of spermatheca.

Distribution. Previously known only from southern Thailand (Ranong Province); new findings extend its range to the eastern part of Cambodia and central Laos.

Remarks. The spermatheca of this species, illustrated here for the first time, is very similar to that of S. paeninsularis paeninusularis Schaufuss, 1889 and S. paeninsularis heissianus Jałoszyński, 2004 .

Syndicus (s. str.) echinatus Jałoszy ñ ski, 2004

Syndicus (s. str.) echinatus Jałoszyński, 2004: 32, Figs. 11 h, 12, 14h, 15a–d, 20a, b, 22a, b.

Material studied: W MALAYSIA: 13, Selangor State, 5-10 km NE Kota Kubu, Baharu, 7. ii. 1994, Grimm & Rachinsky leg. ( SMNS).

Distribution. Previously known from another locality in the Selangor State in West Malaysia – Ulu Gombak; recorded also from the states Pahang and Pinang.

Syndicus (s. str.) difficilis Jałoszy ñ ski, 2004

Syndicus (s. str.) difficilis Jałoszyński, 2004: 51 , Figs. 1 a–d, 2a–e, 3a–f, 5a–f, 14k, 16c, 20g, h, 22d, 23a–c.

Material studied: THAILAND, Chiang Mai Province: 1 ex., Doi Suthep, 1200 m, 27. –29. iv. 2004, leg. R. Grimm; 11 exx., Doi Suthep, 6.8. xii 2001, leg. R. Grimm; 3 exx., Doi Suthep, 1400 m, 10. xii. 1988, leg. Trautner & Geigenmüller; 1 ex., Doi Suthep, 1400 m, 31. xii. 1988, leg. Trautner & Geigenmüller; 3 exx., Doi Suthep Pui N.P., 15. xi. 1998, leg. R. Grimm; 5 exx., Doi Suthep Pui N.P., 26.27. xii. 1994, collector unknown; 21 exx., Chiang Dao, Doi Chiang Dao, 1400 m, 7. i. 1989, leg. Trautner & Geigenmüller; 7 exx., Chiang Dao, Doi Chiang Dao, 1500 m, 9. i. 1989, leg. Trautner & Geigenmüller (all specimens in SMNS).

Distribution. This species has been described on the basis of numerous specimens from Chiang Mai and Chiang Rai; additional new records confirm its status as the most common and abundant Syndicus in northern Thailand.

Figures

FIGURES 1 – 3. Habitus of males. 1 ― Syndicus (s. str.) phangngaensis sp. n.; 2 ― Syndicus (s. str.) kampucheanus sp. n.; 3 ― Syndicus (Semisyndicus) schuelkei sp. n. Scale bars: 1 mm.

FIGURES 4 – 13. Aedeagus in ventral (4, 6, 8) and lateral (5, 7, 9) views; spermatheca in lateral (10, 12) and axial (11, 13) views. 4, 5 ― Syndicus (s. str.) phangngaensis sp. n.; 6, 7, 10, 11 ― Syndicus (s. str.) kampucheanus sp. n.; 8, 9 ― Syndicus (Semisyndicus) schuelkei sp. n.; 12, 13 ― Syndicus (s. str.) paeninsularis bilobatus Jałoszyński. Abbreviations: cc — central complex of endophallus; dag— duct of accessory gland of spermatheca; ds — ductus spermathecae; dv — distal vesicle of endophallus; pp — proximal projection of endophallus; pv— proximal vesicle of endophallus. Scale bars: 4 – 9 — 0.2 mm; 10 – 13 — 0.05 mm.