Mimachrostia fasciata minimus Fibiger

FIBIGER, MICHAEL, 2010, Revision of the Micronoctuidae (Lepidoptera: Noctuoidea) Part 3, Taxonomy of the Tactusinae, Zootaxa 2583 (1), pp. 1-119 : 91

Mimachrostia fasciata minimus Fibiger , new subspecies

( Plate 11 , figure 5; male genit. plate 21, figure 1; female genit. plate 26, figure 5)

Material examined. Holotype: male, Japan, Tsushima Isl. , Kamiagata, Mt. Yamadayama, 200 m, 11.ix.2006, leg. M. Owada, coll. NSMT.

Paratypes. 1 male genit. prep. 5917, 4 females with same data as holotype ; 8 females, Japan, Tsushima Isl. , Kamiagata, Mt. Oboshiyama, 60 m, 12.ix.2006, leg. M. Owada , 1 female genit. prep. 5918 M. Fibiger. Colls NSMT and M. Fibiger .

Taxonomic notes. I refrain from describing another sister-species to M. fasciata , because the differences, though quite many, are too small and resemble differences that occur in other subspecies of described Micronoctuidae . Because of the significantly later appearence in the year, compared with M. fasciata fasciata from Russian Far East, North and South Korea, China, and Japan, the specimens on Tsushima Island could be considered as a second generation of M. fasciata . However, a first generation of M. fasciata is not known from Tsushima Island, and a second generation is not known from within the distribution area of M. fasciata .

Diagnosis and differential diagnosis.

imagines much smaller (10–12 mm) than M. fasciata fasciata (13–15 mm), only 60% wing area compared with M. fasciata fasciata ;

forewing lighter brown grey;

sternite of 8 th segment more pointed at broader triangular plate; anterior hooklike plate broader, with larger plate on left side and longer pointed hook on left side;

tergite of 8 th segment more rounded, with more curved processes;

both parts of ampulla slightly broader;

digitus narrower;

clasper broader;

juxta narrower;

phallus with large platelike crest at right posterior side of ductus ejaculatorius;

antevaginal cone before ostium/antrum less angled anteriorly;

first part of antrum more curved;

second part of antrum shorter (after ‘knee’); and dorsal knobbed plate more rounded.

Distribition. M. fasciata minimus is known only from Japan, Tsushima Isl.; about 100 km from larger Japanese islands; and 60 km from S. Korea. In addition to the distribution given in Fibiger (2008a), M. fasciata fasciata is now known from many collecting sites in North and South Korea, Japan, China and Russia. In Russia, Primorye Terr. it occurs also in De-Friza Peninsula (near Vladivostok); Ryazanovka, Khasansky region; Zanadvorovka, Gornotaezhnoe, Kraunovka, Arsenjev, Lazovsky Nature reserve (43°16ʹN, 134°08ʹE), Scherbakovka. New and northernmost data of all Micronoctuidae species are as follows: 1 female, Khabarovsk terr., vicinity of Khabarovsk, Bolshehechtsirsky nature reserve, (48°11ʹN, 134°42ʹE, 14.vii 2005), leg. V. Dubatolov, and 1 male, Khabarovsk terr., vicinity of Komsomolsk, Komsomolsky nature reserve, Pivan’ (50°31ʹN, 137°035ʹE), 14–19. vii. 2007, leg. V. Dubatolov (coll. ZM IASE, Novosibirsk) ( Fibiger & Kononenko 2008).

Note. Imagines of new subspecies illustrated in comparison with nominotypical subspecies.

Figures

PLATE 11. Figures 1–8. Duplex, Sinochrostia, and Mimachrostia species, adults. 1, 2, D. cockingi, males holotype and paratype, Australia, New South Wales, 11 km SW Narrabri, and Australia, Queensland, 3 km NE Ravensbourne; 3, 4, Sinochrostia sichuanensis, females holotype and paratype, China, Prov. Sichuan, Mt. Emeishan, and China, Prov. Hunan, Suoxiyu; 5, Mimachrostia fasciata minimus, male holotype, Japan, Tsushima Isl., Kamiagata; 6, M. f. fasciata Sugi, 1982, Japan, Shikoku, Ehime; 7, M. novofasciata, male holotype, China, Prov. Hainan, Yinggeling.