Synchroina tenuipennis Fairmaire, 1898

Hsiao, Yun, Ondřej Konvička & Chiun-Cheng Ko, 2018, The world fauna of Synchroidae Lacordaire, 1859 (Coleoptera, Tenebrionoidea, Synchroidae), European Journal of Taxonomy 407, pp. 1-33 : 25-27

Synchroina tenuipennis Fairmaire, 1898

Figs 3J–K , 4F, L , 5K–L, R , 6O–P , 9

Synchroina tenuipennis Fairmaire, 1898: 399 .

Synchroa malaccana Pic, 1917: 14 .

Diagnosis

This species resembles Synchroina cuneata ( Champion, 1916) , but can be distinguished by the following combination of characters: elytra densely and coarsely punctate, spaces between punctures mostly less than 0.5 times puncture diameter; sutural stria on elytra shallower; aedeagus: basal piece ca 0.7–0.9 times parameres ( Champion 1916; Nikitsky 1999).

Material examined

MALAYSIA: 1 ♂, Korbu mt., Banjaran Titi Wangsa mts, 25 km NE of IPOH, Perak, 1200 m, 27 Jan.–2 Feb. 1999, P. Čechovský leg. ( OKZC) ; 1 ♂, Korbu mt., Banjaran Titi Wangsa mts, 25 km NE of IPOH, Perak, 1200 m, 1–15 Apr. 2000, P. Čechovský leg. ( OKZC) ; 1 ♀, Tanah Rata env., gun. Jasar, Cameron Highlands , Pahang distr., 0 4 ° 28.25′ N, 101°22.43′ E, 1450–1650 m, 14 Mar.–7 Apr. 2011, R. Hergovits leg. ( OKZC) ; 2 ♂♂, 1 ♀, Mt. Noring Timur, 150 km S of Jeli, Kg. Tunku , Kelantan, 1200 m, 21 Feb.–14 Mar. 2013, P. Čechovský leg. ( OKZC) ; 1 ♂, Kampong Perias, Mt. Chamah, 70 km NW of Gua Musang , Kelantan, 1900 m, 17 Apr.–9 May. 2014, P. Čechovský leg. ( OKZC).

INDONESIA: 1 ♂, Solok, W. Sumatra, Sep. 1995, unknown collector ( OKZC) ; 1 ♀, Haratai env., Loksado , 2°46′58″ S, 115°33′19″ E, S Kalimantan, 13–17 Oct. 2014, R. Gabriš leg. ( OKZC) .

Redescription

COLOUR. Body and legs reddish-brown to blackish-brown.

Male ( Fig. 3J )

MEASUREMENTS. Length: 6.50–9.25 mm; width: 1.50–2.25 mm.

BODY. Elongate, slightly flattened, elytra rather strongly narrowed posteriorly, covered with yellowish, elongate and decumbent setae.

HEAD. Eyes lateral, large, emarginate in front of antennal insertions, ratio of eye diameter to interocular space 1.0: 1.8–2.0. Antennae filiform, when directed backwards exceeding the humeri of elytra. Scape cylindrical, wider than other antennomeres, pedicel short, antennomere III–XI somewhat clavate, XI longest, length ca 3.5–4.4 times maximum width. Length ratio of antennomeres as follows: 1.65: 1.00: 2.25:2.10: 1.90: 2.00: 2.05: 2.05: 2.10:1.90: 2.50. Apical maxillary palpomere securiform, apical margin rounded, terminal angle somewhat obliquely truncate. Surface lustrous, densely and coarsely punctate; interspaces slightly narrower than puncture diameter.

PRONOTUM. Truncate anteriorly, bisinuate posteriorly, with obtuse median lobe, width ca 1.5 times length, ca 1.4–1.5 times as wide as head. Lateral sides slightly rounded and moderately narrowed in anterior two-thirds toward head, subparallel in posterior one-third, shortly margined basally. Anterior angle rounded; posterior angle rectangular and obtuse. Disc slightly flattened medially, surface lustrous, densely and coarsely punctate; spaces between punctures smaller than puncture diameter. Scutellum width ca 1.5–1.9 times length.

ELYTRA. Elongate, narrowed posteriorly, apex rounded, as wide as pronotal width at humeri, length ca 2.6 times width, surface lustrous. Disc covered with oval punctures, denser in lateral and basal part; interspaces narrower as long as or slightly wider than puncture diameter. 4–8 faint traces of striae in each elytron from dorsal view, stria I fused with II ( Fig. 4F ), gradually shortened outwards, elytral striae indistinct in some specimens. Prosternum before procoxae about as long as shortest diameter of procoxae. Prosternal process long, margined laterally, rounded and narrowed apically; length behind procoxae longer than width between procoxae. Width between procoxae ca 0.4 times transverse coxa diameter. Mesoventrite with shallow, oval mesoventral cavity, smooth. Abdominal ventrite V truncated apically, with terminal margin serrate and slightly concave, serrations at both sides larger than in middle, lateral sides nearly straight ( Fig. 4L ); sternite VIII concave in middle of apical edge, forming two hornshaped lobes curved inwards on both sides, densely pubescent apically ( Fig. 5L ); sternite IX without spiculum gastrale on apical edge ( Fig. 5R ); tergite VIII without median strut on apical edge, subtruncated apically, emarginate in middle, densely pubescent apically ( Fig. 5K ); tergite IX and X completely fused, rounded apically, densely pubescent on apical edge ( Fig. 5R ).

LEGS. Slender. Tarsomeres simple, tarsal formula 5-5-4. The longest spur of hind tibiae ca 0.2 times as long as first tarsal segment; length ratio of tarsomeres as follows: 2.50:1.00: 0.50: 0.75 (measured without claws). Claws serrate.

AEDEAGUS ( Fig. 6O–P ). Lanceloate, basal piece curved dorsally, lateral sides narrowed basically. Parameres narrowly separated apically, with inner margin narrowly concave, dorsal median part with a groove, lateral sides subparallel, slightly sinuate, strongly narrowed at apex, length ca 3.1–3.5 times maximum width. Median lobe elongate, clavate, slightly narrowed apically.

Female ( Fig. 3K )

MEASUREMENTS. Length: 8.00– 9.25 mm; width: 2.00– 2.25 mm.

BODY. Similar to males.

HEAD. Eyes smaller than in male, ratio of eye diameter to interocular space 1.0: 1.6–1.9. Antennae shorter in male, when directed backwards extending the posterior edge of pronotum, antennomere XI ca 3.2 times as long as maximum width. Length ratio of antennomeres as follows: 2.00: 1.00: 2.30: 2.20: 2.05:2.10: 2.05: 2.05: 2.10: 2.10: 2.90.

PRONOTUM. Ca 1.5 times wider than length, ca 1.5 times as wide as head.

ELYTRA. Slightly wider than in male, as wide as pronotal width at humeri, length ca 2.5–2.6 times width.

OVIPOSITOR. Paraproct elongate, ca 2.6–2.8 times length of coxite, sides straight and subparallel; proctiger subtruncate.

Distribution

Malaysia; Indonesia (West Sumatra, South Kalimantan), new record (see below) ( Fig. 9 ).

Notes

This species was described based on specimens from “ Perak, Sumatra ” ( Fairmaire 1898); however, Nikitsky (1999) mentioned that only “ Perak ” was written on the label, and there is no locality in Sumatra called Perak; it is in Malaysia. During our study S. tenuipennis is newly recorded for Indonesia, based on two specimens from West Sumatra and South Kalimantan, respectively.

Figures

Fig. 3. Habitus, dorsal view. A–B. Synchroa punctata Newman, 1838. C–D. S. melanotoides Lewis, 1895. E–F. S. chinensis Nikitsky, 1999. G–H. S. formosana Hsiao, 2015. I. S. elongatula Nikitsky, 1999. J–K. Synchroina tenuipennis Fairmaire, 1898. L. Thescelosynchroa pangu (Hsiao, Li, Liu & Pang, 2016) gen. et comb.nov.A, C, E, G, I, J, L = ♂. B, D, F, H, K = ♀. Scale bars: 5.0 mm.

Fig. 4. Elytron and abdominal ventrite V. A–F. Elytron. G–L. Abdominal ventrite V of ♂♂. — A, G. Synchroa punctata Newman, 1838. B, H. S. melanotoides Lewis, 1895. C, I. S. chinensis Nikitsky, 1999. D, J. S. formosana Hsiao, 2015.E, K. S. elongatula Nikitsky, 1999. F, L. Synchroinatenuipennis Fairmaire, 1898. Scale bars: 0.5 mm.

Fig. 5. Abdominal sternite VIII–IX and tergite VIII–X of ♂♂. A, C, E, G, I, K. Abdominal tergite VIII. B, D, F, H, J, L. Abdominal sternite VIII. M–R. Abdominal sternite IX, and fused tergite IX and X. — A–B, M. Synchroa punctata Newman, 1838. C–D, N. S. melanotoides Lewis, 1895. E–F, O.S.chinensisNikitsky, 1999.G–H,P.S.formosana Hsiao,2015.I–J,Q. S.elongatulaNikitsky,1999. K–L, R. Synchroinatenuipennis Fairmaire, 1898. Scale bars: 0.5 mm.

Fig. 6. Aedeagus. A–E. Synchroa punctata Newman, 1838. F–I. S. melanotoides Lewis, 1895. J–K. S. chinensis Nikitsky, 1999. L. S. formosana Hsiao, 2015. M–N. S. elongatula Nikitsky, 1999. O–P. Synchroina tenuipennis Fairmaire, 1898. Q–R. Thescelosynchroa pangu (Hsiao, Li, Liu & Pang, 2016) gen. et comb. nov. — A–C, F–G, J, L–M, O, Q. Dorsal view. D–E, H–I, K, N, P, R. Lateral view. Scale bars: 0.5 mm.

Fig. 9. Distribution map of Synchroina tenuipennis Fairmaire, 1898 from Malaysia and Indonesia.