A review of Thysanarthria with description of seven new species and comments on its relationship to Chaetarthria (Hydrophilidae: Chaetarthriini) Author Fikáček, Martin Department of Entomology, National Museum, Cirkusová 1740, CZ- 19100 Praha 9 – Horní Počernice, Czech Republic & Department of Zoology, Faculty of Science, Charles University, Viničná 7, CZ- 12844 Praha 2, Czech Republic mfikacek@gmail.com Author Liu, Hsing-Che Department of Environmental Engineering and Management, Chaoyang University of Technology, No. 168, Jifeng E. Rd., Taichung City 413, Taiwan td965771@gmail.com text Acta Entomologica Musei Nationalis Pragae 2019 2019-06-20 59 1 229 252 journal article 8143 10.2478/aemnp-2019-0020 a03ecce2-b526-4f94-aa65-620016956099 1804-6487 4488918 9F309FCC-A2ED-47B9-BC37-D0C4A3B482E5 Thysanarthria persica sp. nov. ( Figs 1B , 10 A–E, 11 ) Thysanarthria cf. sulcata (part): FIKÁČEK et al. (2010: 139 ; misidentification). Type material. HOLOTYPE : ♂ ( NMPC ), IRAN : SISTAN AND BALUCHESTAN: Iran , Baluchistan , 16 km SE of Tange-Sarhe , 61 km , NNW of Nik-shahr , 10.iv.1973 , Expedition National Museum Prague,locality 154. PARATYPES : 4 spec. ( NMPC ), same data as the holotype . FARS : 1 ♂ ( NMPC ): Iran, Fars,Ali-abad, 75 km NW of Djahrom,wadi of the river Shur, 10.vii.1970 , Expedition National Museum Praha,locality 53. KERMAN : 1 ♂ ( NHMW ): Iran, Kerman, Manujan, 110 km E Bandarabaas, at light, 2.vi.1974 , lgt. Pretzmann, Exp. Nat. Hist. Mus. Vindob. [= expedition of the Natural History Museum, Vienna]. Description. Body length 1.7–1.9 mm ( holotype 1.7 mm ), maximum body width 1.0– 1.1 mm ( holotype 1.0 mm). Head and labrum black; pronotum dark brown in centre, becoming slightly paler towards margins; elytra uniformly dark brown; legs brown. Head without microsculpture on interstices; punctation sparse, each puncture bearing pointed seta. Eyes separated by 2.5× the width of one eye in dorsal view. Pronotum with sparse setiferous punctation similar to that on head; interstices without microsculpture. Elytra with 10 striae sharply impressed except in basal fourth where neither striae nor serial punctures are visible; intervals weakly convex at midlength and near apex; interval punctation sparse, setiferous; interstices without microsculpture. Aedeagus ( Figs 10 A–E) 0.5 mm long. Phallobase slightly widened at base of parameres, c. as wide as parameres combined, slightly narrowing towards base, arcuately bent in lateral view. Parameres narrowly elongate, gradually narrowing towards apex, outer face arcuate or indistinctly sinuate. Median lobe narrow with widely rounded membranous apex nearly reaching level of parameral apices, paired subapical projections absent; gonopore transversely oval, situated in distal fourth of median lobe. Differential diagnosis. Unlike most other Thysanarthria except T. wadicola sp. nov. , T. persica has uniformly dark pronotum and elytra. Its genitalia are characteristic by rather elongate parameres with arcuate lateral face and widely rounded apex (in contrast to T. wadicola with prolonged acuminate apices of parameres). It also differs from T. wadicola in the median lobe nearly reaching the level of apices of parameres (in contrast to very short median lobe in T. wadicola ), in parameres c. one third as long as phallobase when seen in lateral view (c. as long as phallobase in T. wadicola ) and in moderately wide bases of parameres in lateral view (very wide base narrowing into a very narrow apex in lateral view in T. wadicola ). Etymology. The name refers to Persia , the historical name of Iran this new species is described from. Adjective. Biology. Based on HOBERLANDT (1981) , the type locality was a rocky bank of a mountain torrent without vegetation at c. 900 m of altitude on stony mountains slopes; the specimens were collected from small gravel strands on the bank of the brook. The paratype from Fars was collected in a wadi with a stream with muddy and sandy banks ( HOBERLANDT 1974 ). Distribution. So far only known from southern Iran .