Acicnemis costulifera Hubenthal, 1919

Lewis, Jake H., Kojima, Hiroaki & Campbell, Erin O., 2025, A Japan-focused review of East Asian Acicnemis Fairmaire, 1849 (Coleoptera, Curculionidae) reveals cryptic diversity in a well-studied region, ZooKeys 1259, pp. 103-167 : 103-167

Acicnemis costulifera Hubenthal, 1919

Fig. 11

Type material examined

(Unknown country: 1). Holotype. Unknown locality: “ Coll. J. Faust Ankauf 1900 ”, bears a red label reading “ Typus ”, SNSD, JHL_ACITAI_003 .

Diagnosis.

Body length 4.8 mm. This is the only species covered here with costate elytra (on the 2 nd, 4 th, and 6 th intervals). Also, is has erect, elongate scales along the odd-numbered elytral intervals (as in A. ryukyuana ).

Distribution.

Acicnemis costulifera is recorded from Taiwan and Japan in Alonso-Zarazaga et al. (2023); however, Hubenthal (1919 b) states that the holotype collection locality is unknown. We examined the holotype specimen and indeed, it does lack labels with any locality data. Furthermore, no specimens of this species collected from Japan were encountered in any of the examined collections. As such, we are confident that the record of this species from Japan is erroneous, and that the record from Taiwan should be treated with suspicion until additional specimens are found.

Figures

Figure 11. Acicnemis costulifera Hubenthal, 1919 (JHL _ ACITAI _ 003). A. Lateral; B. Oblique. Scale bar: 1 mm (applies only to A). Note that the silver region is an entomological pin.