Acicnemis sp. 1

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 sp. 1

Figs 6 R 1–6 , 2 , 29

Material examined

( Myanmar: 2; Taiwan: 7; Thailand: 3; Vietnam: 2; Total: 14). Myanmar • Tamu Village , Kachin State, 7. VII. 2003, A. Abe (2, KUM), JHL_SYN_169 (dissected male), JHL_AREV_717 ; Taiwan • “ Formosa ”, T. Kano (1, NMNS), JHL_AREV_681 ; • His-Leng , 5. V. 1981, S. Tsuyuki (5, TUA), JHL_SYN_175 (dissected male), JHL_SYN_176 (dissected male), JHL_AREV_714 – JHL_AREV_716 ; • Lushan Wenchuan , Nantou Hsien, 6. VI. 1976, H. Makihara (1, KUM), JHL_AREV_719 ; Thailand • Pupin-Meo , 11. X. 1993, T. Senoh (1 dissected male, KUM), JHL_SYN_170 ; • Chiang Rai, Wiang Pa Pao , 12. XI. 2012, K. Takahashi (2, KUM), JHL_AREV_718 (EGP 0160 - H 9), JHL_AREV_722 ; • Doi Suthep , 23. VI. 1993, T. Senoh, (1, KUM), JHL_AREV_766 ; Vietnam • Phia Oac National Park near Phia Den, Cao Bang Province, 22°32'20"N, 105°51'57"E, 19–22. III. 2012, S. D. Gaimari, M. Hauser, H. T. Pham (2, CMNC), JHL_AREV_703 , JHL_AREV_704 ; • “ IIea ” Binh , Tonkin, bears red label reading “ simpliciata Typus H. ”, bears brown label reading “ A. simpliciata m ♂ Heller det. 1930 ” (1, SNSD), JHL_ACITAI_093 .

Diagnosis.

Body length 4.1–5.0 mm. Covered in pale and dark brown scales, with bright X-shaped band of white scales across apical 1 / 2 of elytra, which extends up to the elytra humeri. Distinctive bright white scale bands also present on hind femora. Pronotum lacking distinct longitudinal, impunctate midline (present in A. koguma ). Scutellum small, bordered by pale, yellow scales, and weakly bare dorsally (or covered in scales); compare with A. kiotoensis which possesses a large, broad, bare scutellum. Only odd elytral intervals with broad, erect scales. Sclerolepidia numerous, dense, and nub-like, protruding laterally outward (unlike A. maculaalba , A. kiotoensis , and A. koguma which have indistinct, low, rounded sclerolepidia). Third tarsomeres emarginate (as opposed to truncate, as in A. koguma ). Pedon with lateral edges approx. parallel in dorsal view, but sinuating in distal 1 / 2 into a distinct point. Internal sac protruding and clear across posterior 2 / 3; with two bean-shaped and U-shaped sclerotized structure anteriorly at apex (Fig. 6 R 1 – 2 ).

Distribution.

This widely distributed species occurs in Vietnam, Thailand, Myanmar, and Taiwan.

Remarks.

One of K. M. Heller’s specimen of this species in the SNSD collection has a holotype label with the name “ A. simpliciata ” written ( JHL _ACITAI_093 ); however, we were unable to find a formal description of this species in any of Heller’s works. Heller often attached type labels to specimens without formally publishing the descriptions (Olaf Jäger – SNSD Collection Manager to JHL, pers. comm. 2025; Katsura Morimoto – KUM Curator to HK pers. comm., 2025). Thus, this species is likely undescribed; however, there are a number of other similar Southeast Asian species for which type material should be compared with Acicnemis sp. 1 before formal description. This falls outside of the scope of the current work (study area); however, we still acknowledge the presence of this species in Taiwan and treat it here as an unnamed species.

Figures

Figure 2. Diagnostic morphological characters in Acicnemis. A. A. azumai Morimoto & Miyakawa, 1995 (JHL _ ACITAI _ 081) showing lack of prominent posterior prosternal projections; B. A. laeta Hubenthal, 1919 (JHL _ AREV _ 533) showing prominent prosternal projections; C. A. kiotoensis Nakane, 1963 (JHL _ AREV _ 982) showing antenna with the second funicular antennomere longer than antennomeres 3 + 4; D. A. koguma Lewis & Kojima, sp. nov. (JHL _ SYN _ 141) showing antenna with the second funicular antennomere shorter than antennomeres 3 + 4; E. A. luteomaculata Morimoto & Miyakawa, 1995 (JHL _ AREV _ 189) showing truncate third tarsomere; F. A. ryukyuana Lewis, 2023 (JHL _ ACI _ 011) showing weakly emarginate third tarsomere; G. A. maculaalba Roelofs, 1875 (JHL _ AREV _ 577) showing strongly emarginate third tarsomere.

Figure 6. Aedeagi of Acicnemis. A 1–2. A. albofasciata (Ter-Minasian 1953); B 1–2. A. azumai Morimoto & Miyakawa, 1995; C 1–2), A. cryptica Lewis & Kojima, sp. nov.; D 1–2. A. dividicincta Morimoto & Miyakawa, 1995; E 1–2. A. exilis Morimoto & Miyakawa, 1995; F 1–2. A. kiotoensis Nakane, 1963; G 1–2. A. laeta Hubenthal, 1919; H 1–2. A. luteomaculata Morimoto & Miyakawa, 1995; I 1–2. A. maculaalba Roelofs, 1875; J 1–2. A. nobilis Hubenthal, 1919; K 1–2. A. nohirai Morimoto & Miyakawa, 1995; L 1–2. A. palliata Pascoe, 1872; M 1–2. A. postica Hubenthal, 1919; N 1–2. A. ryukyuana Lewis, 2023; O 1–2. A. sauteri Hubenthal, 1919; P 1–2. A. shibatai Voss, 1971; Q 1–2. A. shigematsui Morimoto & Miyakawa, 1995; R 1–2. Acicnemis sp. 1; S 1–2. A. squamata Lewis & Kojima, sp. nov.; T 1–2. A. suturalis Roelofs, 1875.

Figure 29. Acicnemis sp. 1 (JHL _ AREV _ 766). A. Lateral; B. Dorsal. Scale bar: 1 mm.