Acicnemis cordata 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 cordata Hubenthal, 1919

Fig. 10

Acicnemis fukienensis Voss, 1958 .

Type material examined

( Vietnam: 1). Holotype. Vietnam • “ Mau-son , Tongking ” (modern day northern Vietnam), “ Gehr. W. Muller, Vermacht, 1909 ”, bears a red label reading “ Typus ”, SNSD, JHL_AREV_987 .

Diagnosis.

Body length 5.0 mm. Virtually indistinguishable externally from A. maculaalba (see that species). Although most A. maculaalba have the white elytral spots interrupted by brown scales along the first elytral interval, some have no interruption (as in the A. cordata holotype); therefore, this character cannot be used alone to reliably separate A. maculaalba and A. cordata .

Distribution.

This species is known from the type locality (Mau-son, Tongking, which corresponds to modern day northern Vietnam) and apparently also Kuatun, China (Voss’s specimen).

Remarks.

We examined the holotype specimen of A. cordata Hubenthal, 1919 (collected from Fujian, China; SNSD) and found it is virtually indistinguishable externally from Taiwanese and Japanese specimens of A. maculaalba . However, as the A. cordata holotype is a female, it was not possible to examine the male genitalia, which are extremely important for distinguishing members of the A. maculaalba species complex. We tentatively recognize A. cordata here, but also note that further examination of specimens from mainland Asia is necessary to work out the species in this complex.

Figures

Figure 10. Acicnemis cordata Hubenthal, 1919 holotype (JHL _ AREV _ 987). A. Lateral; B. Dorsal. Scale bar: 1 mm.