Platamartus jakowlewi Reitter, 1892

Hisamatsu, Sadatomo, 2011, A review of the Japanese Kateretidae fauna (Coleoptera: Cucujoidea), Acta Entomologica Musei Nationalis Pragae 51 (2), pp. 551-585 : 560-562

Platamartus jakowlewi Reitter, 1892

( Figs. 1E–F , 5 )

Platamartus jakowlewi Reitter, 1892: 151 . Type locality: Ostsibirien [= East Siberia].

Platamartus jakowlewi: JELÍNEK & AUDISIO (2007: 458) [catalogue].

Material examined. JAPAN: IBARAKI: 1 ♀, Okami–Satomi , 28.v.1988, Y. Hirano leg. TOCHIGI: 2 JJ 4 ♀♀, Watarase-yûsuichi, Fujioka-chô , 26.iv.2006, H. Ohkawa leg. ; 2 JJ 12 ♀♀, Watarase-yûsuichi, Fujioka-chô , 24.–25.iv. 2010, S-T. Hisamatsu leg. ; 1 J 2 ♀♀, Watarase-yûsuichi, Fujioka-chô, 24.iv.2010, T. Kurihara leg. GUNMA: 1 ♀, Morinji-numa, Tatebayashi City, 22.–27.iv.2006, H. Ohkawa leg. ( EUM) .

Diagnosis. Body coloration black; mouthparts and legs reddish brown; in male, antennal segments 1–3 reddish-brown and segments 4–8 gradually becoming darker apicad, in female antennal segments 1–8 reddish-brown; antennal club black in both sexes. Abdominal sternites III–V with tuft of setae in the middle.

Redescription. Length 2.5–3.5 mm.

Male. Body ( Fig. 1E ) elongate oval, rather flattened, strongly shining; dorsal disc with a long, grayish-yellow setae. Coloration black; mouthparts and legs reddish-brown; antennal segments 1 to 3 reddish-brown; segments 4–8 gradually becoming darker toward apical segments; segments 9–11 black.

Head densely punctate, punctures on disc larger than eye-facet, separated by <1 diameter; interspaces finely reticulate. Frontoclypeal suture incomplete, faintly visible. Front margin of clypeus with medial arcuate emargination. Labrum broadly notched at middle. Mandibles slightly bent inward. Antennae elongate, 2.25 times as long as HW (n = 2); approximate ratio of each segment (n = 1) is 2.50: 1.00: 1.70: 1.40: 1.50: 1.40: 1.30: 1.20: 1.20: 1.20: 1.50.

Pronotum transverse, 1.40–1.41 times as wide as long (n = 2); lateral margins explanate, distinctly serrate, strongly projecting at mid-length, then abruptly converging both anteriorly and posteriorly; anterior corner rounded; posterior corner sharply prominent; anterior margin nearly straight or with slight curvature, clearly bordered; basal margin gently arcuate, distinctly bordered; punctures on disc about as large as those on head, separated by ≤1 diameter; interspaces reticulate.

Elytra conjointly 1.03–1.11 times as long as wide (n = 2), 1.60–1.72 times as long as pronotum (n = 2), widest at mid-length; punctures on disc larger and denser than those on pronotum, separated by <1 diameter; interspaces smooth. Abdominal tergite VI partially exposed. Abdominal tergite VII fully exposed, apex truncate. Abdominal tergite VIII externally visible.

Prosternum (excluding prosternal process) remarkably long, 1.20 times as long as mesoventrite (n = 1), 0.81 times as long as metaventrite (n = 1); prosternal process subparallel-sided. Mesoventrite feebly depressed below the level of the metaventrite, apical margin between inter-mesocoxa straight. Metaventrite convex, shining, metathoracic discrimen in basal 1/2; disc with sparse punctures, separated by 1-2 diameter at middle, punctures on disc becoming denser laterally. Inter-mesocoxal distance separated by 2.50 times width of inter-procoxal distance. Inter-metacoxal distance separated by 2.83 times width of inter-procoxal distance. Abdominal sternites III–V ( Fig. 5H ) with tuft of setae in middle; approximate ratio of length of abdominal sternites III–VII (n = 1) is 2.14: 1.00: 1.00: 1.57: 3.05. Legs long and slender; base of tarsal claws ( Fig. 5E ) more or less enlarged.

Male genitalia sclerotized; tegmen ( Fig. 5A ) with parameres asymmetrical, bearing long setae at apex; interparameral lobe broadly rounded; apex of median lobe ( Fig. 5C ) bluntly rounded in lateral aspect.

Female. Antennal flagella reddish-brown, club black; antennae ( Fig. 5I ) distinctly shorter than those of male, 1.25–1.40 times as long as HW (n = 3); approximate ratio of each segment (n = 1) is 2.30: 1.40: 1.60: 1.40: 1.10: 1.10: 1.10: 1.00: 1.70: 1.60: 2.10. Apical margin of abdominal tergite VII rounded. Ovipositor ( Fig. 5D ) deeply bifid, styli small.

Variability. Kirejtshuk (pers. comm.) notes that the tufts of setae on abdominal sternites III–V are frequently reduced in Siberian specimens.

Bionomics. This species was collected from the flowers of Carex dispalata Boott (Cyperaceae) , and in syntopy with Sibirhelus corpulentus in spring.

Distribution. Japan (Honshû), new record; Russia (East Siberia) ( JELÍNEK & AUDISIO 2007).

Figures

Fig. 1. Habitus and labels of Kateretidae spp. A–B – Kateretes japonicus Hisamatsu, 1985: A – holotype, male; B – ditto, labels; C–D – Kateretes takagii S-T.Hisamatsu, 2006:C – holotype, male; D – ditto, labels; E–F – Platamartus jakowlewi Reitter, 1892: E – male and F – female (both Tochigi Pref.); G–H – Heterhelus (Heterhelus) japonicus (Reitter, 1878): G – lectotype, male; H – ditto, labels. Scale bars = 1.0 mm.

Fig. 5. Platamartus jakowlewi Reitter, 1892.A – tegmen (ventral view); B – median lobe (ventral view); C – median lobe (lateral view); D – ovipositor; E – tarsal claw of right foreleg; F – left maxillary palpus; G – pronotum; H – abdominal sternites; I – right antenna, female; J – ditto, male. A–J – Tochigi Pref., Watarase-yûsuichi.