Acrorrhinium Noualhier 1895

Acrorrhinium Noualhier, 1895

Acrorrhinium Noualhier, 1895: 175 (n. gen.); Schuh, 1984 (diag.); 1995: 213 (cat.); Kerzhner & Josifov, 1999: 286 (cat.); Yasunaga, 2001: 152 (diag.); Yasunaga et al., 2013b: 430 (diag.); Schuh & Menard, 2013: 6 (tribal placement). Type species by monotypy: Acrorrhinium conspersus Noualhier, 1895.

Distinguished from other hallodapine genera by the following characters: elongated body about 3–7 mm in length; remarkably long appendages; nearly parallel hemelytron laterally; pale to deep brown coloration, with either mottled or contrasting maculae on hemelytron; protuberant eyes far from anterior margin of pronotum; strongly convex frons, with spiniform protuberance anteriorly; and form of endosoma. For detailed description see Schuh (1984: 103).

Among thirty-one described species of genus Acrorrhinium from the Old World tropics and sub-tropics, seventeen species are known to occur in Asiatic tropics and sub-tropics (Duwal et al., 2014; Schuh, 1984; 2002 – 2013; Yasunaga et al., 2013b; Yasunaga & Duwal et al., 2015). A single temperate zone inhabitant, Acrorrhinium inexpectatum is known from East Asia, including Japan. As mentioned by Yasunaga et al. (2013b), members of this unique genus inhabit tree trunks or branches (Fig. 1 A), so they often have a cryptic, mottled color pattern similar to their habitat (Fig. 1 B–F).