Acalypta cooleyi Drake 1917

Acalypta cooleyi Drake, 1917

(Figs. 1 A–B, 1E–F, 2A, 2C, 3A, 3C)

Acalypta cooleyi Drake, 1917: 213. Holotype: macropterous ♀, USA: Montana, Bozeman; USNM.

Acalypta spinifrousa Jing, 1980: 398. Holotype: brachypterous ♂, China: Beijing, Xiangshan; NKUM. Synonymized by Golub (1988: 52).

Acalypta cooleyi: Drake & Lattin (1963: 337) (brachypterous morph, distribution, biology); Golub (1973: 631) (distribution, biology); Golub (1977: 222) (distribution); Péricart & Golub (1996: 7) (checklist, Palaearctic); Golub (1998: 170) (distribution); Aukema et al. (2013: 58) (checklist, Palaearctic).

Acalypta spinifrousa: Jing (1981: 283) (monograph).

Acalypta sp.: Maehara (2014: 58) (distribution).

Material examined (2 ♂♂ 7 ♀♀). JAPAN, Honshu, Tochigi-ken, Shioya-gun, Shioya-machi, Sanuki, 23.iv.2018, leg. S. Maehara (1 brachypterous ♂, 2 brachypterous ♀♀, 3 macropterous ♀♀); same locality, 1.v.2018, leg. J. Souma (1 brachypterous ♂ 2 brachypterous ♀♀).

Diagnosis. Recognized among other species of Acalypta by a combination of the following characters: body dark gray, elongate in brachypterous morph and oblong in macropterous morph, approximately 2.2 mm long from head to apices of hemelytra in brachypterous morph and approximately 2.9 mm long in macropterous morph (Figs. 1 A–B, 1E–F); antenniferous tubercles sharp and straight; pronotum tricarinate, 1.2 times as long as maximum width across paranota; calli coarsely punctate; paranotum with 3 rows of areolae at widest part; anterolateral angle of paranotum angular, strongly protruding anteriad, reaching mid-level of compound eye; posterolateral angle of paranotum not protruding posteriad; posterior process of pronotum long, 1.2 times as wide as its length; posterior margin of hemelytron in brachypterous morph weakly sinuate (Fig. 1A); gap between both hemelytra in brachypterous morph narrower than discoidal area at each widest part (Fig 1A); costal area with 2 rows of areolae throughout its length; subcostal area with 3 rows of areolae at its widest part; discoidal area in both brachypterous and macropterous morphs not expanded beyond apical fourth of hemelytron, as wide as subcostal area at widest parts of each; basal third of discoidal-sutural boundary vein strongly carinate; pygophore flat and pentagonal, triangularly elevated at center of venter, arranged with several distinct transverse wrinkles (Figs. 2A, 3A); apical margin of female abdomen rounded, weakly concave at apex (Fig. 2C); and paramere thick and long, evenly curved inward (Fig. 3C).

Remarks. This species slightly resembles A. gracilis (Fieber, 1844), A. lillianis Torre-Bueno, 1916, A. marginata (Wolff, 1804), A. parvula (Fallén, 1807) and A. platycheila (Fieber, 1844) in general appearance, but it is easily distinguished from them by the following characters: antenniferous tubercles sharp and straight (Figs. 1 A–B); anterolateral angle of paranotum angular, strongly protruding anteriad, reaching mid-level of compound eye (Figs. 1 A–B). It is very similar to A. acutangula (Jakovlev, 1880) in the shape of the antenniferous tubercles and the anterolateral angle of the paranotum, but it can be distinguished from the latter by the following characters: posterior margin of hemelytron in brachypterous morph weakly sinuate (Fig. 1A); the gap between both hemelytra of the brachypterous morph narrower than discoidal area at widest part of each (Fig. 1A); and subcostal area with 3 rows of areolae at its widest part (Figs. 1 A–B). On the other hand, A. acutangula has the posterior margin of hemelytron strongly sinuate in the brachypterous morph; the gap between both hemelytra of the brachypterous morph wider than discoidal area at widest part of each; and subcostal area with 4–5 rows of areolae at its widest part.

A tingid recorded as Acalypta sp. by Maehara (2014) also corresponds to A. cooleyi.

Distribution. Japan (Honshu), northern China, Kazakhstan, Mongolia, eastern Russia, Tajikistan, U.S.A.

Host-plant. It occurs on Racomitrium japonicum Dozy et Molk. (Grimmiaceae) in Japan (Maehara 2014; personal observation). This species has been collected from unidentified mosses in Kazakhstan, eastern Russia, and the U.S.A. (Drake & Lattin 1963; Golub 1973).

Biology. It overwinters as nymphs in Japan; adults are observed from April to June (Maehara 2014). Adults have been collected from May to September in other countries (Drake 1917; Golub 1973, 1977, 1998; Jing 1980).