Syndicus (Syndicus) philippinus Yin and Zhou, 2016

Yin, Zi-Wei & Zhou, De-Yao, 2016, New Species, New Synonymy, and Additional Records ofSyndicusMotschulsky (Coleoptera: Staphylinidae: Scydmaeninae), The Coleopterists Bulletin 70 (4), pp. 871-879 : 871-879

Syndicus (Syndicus) philippinus Yin and Zhou , new species

( Figs. 1B , 3 )

Type Material. Holotype ♂: ‘ Kiamba, Sarangani, Mindanao, March , 2015 (obtained from a beetle trader) / HOLOTYPE (red), ♂, Syndicus philippinus sp. n., det. Yin & Zhou, 2016’ ( SNUC) .

Diagnosis. This new species can be readily separated from all other Syndicus by the large body (3.41 mm), clypeus with a deeply and broadly emarginate anterior margin, and unique structure of the aedeagal endophallus.

Description. Male. BL = 3.41 mm; body ( Fig. 1B ) strongly convex, dark reddish brown, legs and palpi slightly lighter. Head broadest at large, finely faceted, and moderately convex eyes, HL = 0.52 mm, HW = 0.73 mm; tempora rounded in dorsal view; vertex transverse, regularly convex; antennal tubercles weakly raised; clypeus with deeply and broadly emarginate anterior margin not adjacent to posterior margin of labrum. Head dorsally glossy, sparsely and finely punctate; setae sparse, moderately long. Antenna ( Fig. 3A ) slightly shorter than 0.6X BL, with small antennomere II, other antennomeres subequal in width throughout, AnL = 1.71 mm, relative lengths of antennomeres = 1.7: 1.1: 2.0: 2.5: 2.7: 2.6: 2.5: 2.5: 2.6: 2.9: 0.7. Pronotum elongate and strongly convex, widest near anterior third; PL = 1.18 mm, PWb = 0.61 mm, PWm = 0.86 mm; discal part subtrapezoidal, strongly narrowing posteriorly and strongly constricted near posterior fourth, posterior collar long, laterally connected to side constrictions and separated from disc by transverse row of 4 distinct dorsal pits; punctation of disc similar to that on head; setae long, suberect, moderately dense. Elytra elongate and convex, broadest before middle and strongly narrowing toward apices; EL = 1.70 mm, EW = 1.14 mm, EI = 1.48; humeral calli distinct, protruding anteriorly; apices of elytra rounded; disc finely punctate; setae similar to those on pronotum. Legs with dorsal femoral groove broad and deep, extending from base toward apex of femoral clava; metafemur with ventral margin of clavate part smoothly rounded ( Fig. 3H ). Aedeagus ( Fig. 3B–D ) elongate, AeL = 0.63 mm; endophallus ( Fig. 3E–F ) relatively simple, central complex composed of broadly separated, elongate lateral parts, connected distally to indistinct lateral structures; parameres ( Fig. 3G ) longer than median lobe, in lateral view with gradually broadened apices, without setae.

Female. Unknown.

Comparative Notes. This is the second Syndicus species known to occur in the Philippines. Syndicus philippinus shares with Syndicus schawalleri Jałoszyński, 2009 ( Philippines: Leyte Is.) and Syndicus lombokensis Jałoszyński, 2009 ( Indonesia: Lombok Island) a relatively large body size, but can be readily separated from both species by the structure of the aedeagal endophallus (especially the forms of the lateral lobes and the central complex), more elongate and regularly convex pronotum (pronotum distinctly stouter in S. lombokensis ; pronotal disc strongly convex in S. schawalleri ), and more elongate elytra, evenly narrowing from middle toward apex (elytra relatively much broader in S. schawalleri ; elytra strongly narrowing toward apices in S. lombokensis ). The clypeus of the male of S. philippinus has a deeply, broadly emarginate anterior margin not adjacent to the posterior margin of the labrum, a character state also found in the male of Syndicus (s. str.) paeninsularis bilobatus Jałoszyński, 2004. They can be separated by the much larger body size of S. philippinus , and the structure of the endophallus is quite different.

Bionomics. Unknown.

Distribution. Philippines: Mindanao Island.

Etymology. The species epithet is derived from the Philippines, where the type locality of the new species is situated.

Figures

Fig. 1. Syndicus species, dorsal habitus. A) S. qiong, B) S. philippinus.

Fig. 3. Syndicus philippinus, male. A) Right antenna, B) Aedeagus, dorsal view, C) Aedeagus, lateral view, D) Aedeagus, ventral view; E and F) Endophallus, dorsal view, G) Paramere, lateral view, H) Metafemur, lateral view.