Cavelerius parvimaculatus, Gao & Zhou, 2021

Gao, Cuiqing & Zhou, Yu, 2021, Review of the genus Cavelerius (Heteroptera: Blissidae) with descriptions of three new species from China and Southeast Asia, Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 61 (1), pp. 113-132 : 129-131

Cavelerius parvimaculatus sp. nov.

( Figs 13c, d; 15 )

Type material. Hඈඅඈඍඒඉൾ: THAILAND: J (brachypterous), 2.i.1998. THAILD / CΗංൺඇG Mൺං / Samoeng // N 018°51′45.2″ / E 098°43′18.7″ // Dr. Wolfgang G. / ULLRICH / collection [pr] ( NKUM). Pൺ*©ൺඍඒඉൾඌ: 27 JJ 22 ♀♀ (brachypterous), 1 J 2 ♀♀ (submacropterous), same as holotype ( NKUM).

Description. Brachypterous or submacropterous.

Brachypterous form. Moderately sized, male slightly smaller than female. Colouration. Head, pronotum and scutellum black, abdomen brownish black except for slightly reddish brown connexivum. First antennal segment yellow, second segment light brownish black, third and fourth segments brownish black. Hemelytra pale yellow. Claval commissure and about apical one-third of vein A1 brownish black, apical corial margin brownish black. About terminal one - fourth of corium except for exocorium brownish black. Membrane pale yellow, very small spot adjacent to distal margin of corium and veins brownish black ( Fig. 13c). Legs orange yellow, anterior tibiae darker.

Structure. Head broad, tip of clypeus at most extending forward to apical one-third of first antennal segment. Pronotum with lateral margins slightly sinuate. Anterior lobe slightly wider or equal to width of posterior lobe. Posterolateral lobes slightly produced caudad. Hemelytra divergent. Membrane only overlapping on inner edge. Hemelytra at most extending to posterior half of tergite IV.

Submacropterous form. Width of anterior lobe slightly less than width of posterior lobe. Hemelytra extending to posterior half of tergite VI. Membrane pale yellow, obscure small middle spot adjacent to distal margin of corium and veins brownish black ( Fig. 13d).

Both forms. Spiracles on laterotergite II large, about one - fourth as large as total width of laterotergite II there ( Fig. 15b ). Apical part of pygophoral dorsal opening hexagonal, slightly narrower than basal part ( Fig. 15c ). Outer lobe of paramere thin and long; inner lobe of paramere tiny and oriented to base; blade slightly curved, apex obtuse ( Figs 15d–g ). Phallus shown in Figs 15 h–j . Wings of sperm reservoir widest near base, about three times longer than width ( Fig. 15h ).

Measurements (submacropterous (n = 3) / brachypterous (n = 10); mm). Body length 6.51–9.04 / 5.94–7.53; maximum width 1.68–2.18 / 1.60–2.02. Head length 0.76–0.81 / 0.65–0.79; width across eyes 0.95–1.09 / 0.89–1.04; interocular space 0.67–0.77 / 0.66–0.75; interocellar space 0.37–0.43 / 0.36–0.42; eye–ocellus space 0.21–0.23 / 0.17–0.20; eye length 0.18–0.20 / 0.16–0.21; eye width 0.15–0.16 / 0.12–0.14. Length of antennal segments I–IV: I – 0.25–0.29 / 0.22–0.27, II – 0.64–0.77 / 0.61–0.76, III – 0.59–0.69 / 0.57–0.68, IV – 0.97–1.08 / 0.90–1.10. Length of labrum 0.62 / 0.54; length of labial segments I–IV: I – 0.54 / 0.46, II – 0.68 / 0.58, III – 0.58 / 0.50, IV – 0.52 / 0.48. Thorax: Pronotum, median length 1.07–1.24 / 0.96–1.19; width at posterior margin 1.56–1.81 / 1.27–1.60; width at anterior margin 1.48–1.76 / 1.31–1.61. Scutellar length 0.72–0.89 / 0.40–0.56, width 1.02–1.04

/ 0.59–0.74. Length of hemelytra 3.95–3.96 / 1.91–2.62; length of corium 2.06–2.56 / 1.31–1.90; claval commissure 0.52–0.57 / 0.39–0.45.

Differential diagnosis. According to the key (Sඅൺඍൾ*© & Mංඒൺආඈඍඈ 1963), it can be traced to C. illustris or C.

obscuratus. It can be separated from C. illustris by the posterior margin of pronotum evenly concave and body larger (5.94–9.04 mm) (vs. the posterior margin of pronotum very deeply concave and body smaller (5.75 mm) in C. illustris ). The new species differs from C. obscuratus in pale yellow membrane with brownish black veins and

a small spot adjacent to corium (vs. membrane almost uniformly brown except for a small pale yellowish area at base in C. obscuratus ).

Cavelerius parvimaculatus sp. nov. is similar to C.

mishmiensis in having a similar colouration of antennae and legs, and the swollen anterior lobe, but it can be separated by yellow corium and clavus, the absence of a brown spot on the membrane, and by head shorter than the length of the fourth antennal segment (vs. corium and clavus dark brownish yellow, membrane nearly uniformly dark chocolate brown, and head longer than the length of the fourth antennal segment in C. mishmiensis ).

Cavelerius parvimaculatus sp. nov. is also similar to C.

saccharivorus in having a similar colouration of antennae and legs, and corium brown distally, but C. saccharivorus shows an irregular brown spot on membrane. In addition, only the inner part of the left membrane covers the right one in brachypterous specimens ( Fig. 13c) (vs. the left membrane fully covers the right one in brachypterous specimens in C. saccharivorus ( Fig. 1e )).

Etymology. The specific epithet “ parvimaculatus ” is a Latin word, referring to the very small spot adjacent to corium on membrane; adjective.

Distribution. Thailand (Chiang Mai).

Figures

Fig. 15. Cavelerius parvimaculatus sp. nov. a – female abdominal dorsum, dorsal view; b – basal part of female abdominal dorsum, enlarged; c – pygophore, posterodorsal view; d–g – left paramere, four different aspects; h–j – phallus, three different aspects.

Fig. 1. Cavelerius spp. a – C. antennatus Slater & Miyamoto, 1963, dorsal view; b–c – C. tinctus (Distant, 1903), dorsal and ventral view; d – C. minor Slater & Miyamoto, 1963, dorsal view; e–f – C. saccharivorus (Okajima, 1922), dorsal and ventral view.