Cavelerius nigrivena, 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 : 125-128

Cavelerius nigrivena sp. nov.

( Figs 13a, b; 14 )

Type material. Hඈඅඈඍඒඉൾ: THAILAND: J, 16.vii.1997. THAILAND / CIJංൺඇǤ Mൺං.ca / 3 km. E Samoeng // N 018°51' 43.4″ / garden area / E 098°42′13.1″ // Dr. Wolfgang G / ULLRICH / collection [pr] ( NKUM). Pൺ*©ൺඍඒඉൾඌ:JJ 2 2♀♀, same as holotype ( NKUM);4 JJ 5♀♀, 18.vi.1995 THAI / CIJංൺඇǤ Mൺං / Samoeng // Dr.Wolfgang G / ULLRICH / collection [pr] ( NKUM). LAOS: 1 ♀, N - LAOS: Prov. Lg. Nam Tha / ca., 20 km NW Lg, Nam Tha / 9.vi. 1996. 700m / coll. Schillhammer (17) [pr] ( NHMW).

Description. Body robust. Colouration. Head, pronotum, scutellum and abdomen black. First antennal segment and approximately basal two - thirds of second segment yellow, posterior part of second and whole third segment dark brown, fourth segment brownish black. Hemelytra pale yellow, membrane slightly yellowish white. Inner margin and commissure of clavus and about apical half of vein A1 on clavus blackish brown. About basal one-third of inner corial vein pale yellow, otherwise black brown. Terminal one-third of corium and whole corial margin blackish brown. Membrane with central irregular blackish brown spot, far from lateral margin of membrane; veins posteriad of blackish brown spot dark and gradually fading to yellow. Legs yellowish brown.

Structure. Head broad, tip of clypeus at most extending forward to apical one-third of first antennal segment. Pronotum with lateral margins only very slightly sinuate, transverse impression weekly developed and slightly concave, maximum width of posterior lobe slightly greater than that of anterior lobe. Posterolateral lobes slightly produced caudad, posterior margin of pronotum slightly concave. Membrane tapering, at most extending onto tergite VI. Abdomen wider than hemelytra. Labium extending onto mesosternum.

Female tergum oval ( Fig. 14a ). Spiracles on laterotergite II about one - fourth as large as total width of laterotergite II there ( Fig. 14b ). Apical part of pygophoral dorsal opening oval, distinctly narrower than basal part ( Fig. 14c ). Outer lobe of paramere robust, long and pointed; inner lobe of paramere short and oriented to base; tip of blade curved, apex obtuse ( Figs 14d–g ). Phallus shown in Figs 14 h–k . Wings of sperm reservoir widest near base, more than three times longer than wide ( Fig. 14k ).

Measurements (n = 10; mm). Body length 7.30–9.00; maximum width 1.91–2.37.Head:length 0.63–0.68; width across eyes 1.14–1.18; interocular space 0.76–0.85; interocellar space 0.36–0.48; eye–ocellus space 0.18; eye length 0.19–0.20; eye width 0.15–0.16. Length of antennal segments I–IV: I – 0.25–0.29, II – 0.74–0.87, III – 0.65–0.74, IV – 0.95–1.05. Length of labrum 0.6; length of labial segments I–IV: I – 0.50, II – 0.60, III – 0.52, IV – 0.50. Thorax: Pronotum, median length 1.38–1.58; width at posterior margin 1.65–1.95; width at anterior margin 1.56–1.86. Scutellar length 0.59–0.72, width 0.88–1.04. Length of hemelytra 4.08–4.55; length of corium 2.49–2.64; claval commissure 0.68–0.79.

Differential diagnosis. According to the key (Sඅൺඍൾ*© & Mංඒൺආඈඍඈ 1963), the new species can be traced to C. sweeti , but it differs from C. sweeti in the following combination of characters: spot not reaching the lateral margin of membrane; veins dark posteriad of the blackish brown spot and gradually fading to yellow; body larger (about 7.3–9.0 mm) (vs. spot reaching the lateral margin of membrane, veins almost concolorous with the background colour, and body smaller (about 6.32 mm) in C. sweeti ).

The new species is also similar to C. tinctus in having a similar antennal colouration, and a brown spot of membrane, but its body is larger (about 7.30–9.00 mm) (vs. body smaller (about 5.64–7.72 mm) in C. tinctus ), and the abdominal spiracle size is larger than that in C. tinctus .

Etymology. The species epithet, nigrivena , derived from Latin, refers to the dark veins posteriad of the blackish brown spot that gradually fade to yellow.

Distribution. Thailand (Chiang Mai), Laos (Luang Nam Tha).

Figures

Fig. 14. Cavelerius nigrivena 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; k – sperm reservoir and adjoining portion of phallus, dorsal view.