Sueus species

Cognato, Anthony I., Smith, Sarah M., Schiffer, Matthew & Li, You, 2024, A taxonomic review of Sueus Murayama, 1951 ambrosia beetles (Coleoptera: Curculionidae: Scolytinae: Hyorrhynchini) aided by molecular phylogenetic analyses, Zootaxa 5477 (4), pp. 475-493 : 480-482

Key to Sueus species (females only)

1 Elytral declivity acutely tapered to the apex, apex 1/4 width of the declivity base ( Fig. 4 )................................................................................................. S. chatterjeei Smith & Cognato sp. nov.

- Elytral declivity broad to the apex, apex at least 1/2 width of the declivity base ( Fig. 3 ).............................. 2

2 Declivital interstriae bearing rows of large and prominent denticles or granules, clearly visible above setae in lateral profile ( Fig. 5 )… 3

- Declivital interstriae bearing minute granules, obscured by setae in lateral profile.................................. 4

3 Declivital interstriae and the apical margin bearing widely separated prominent denticles with sharply hooked apices ( Fig. 10 )................................................................................... S. striatulus (Schedl)

- Declivital interstriae but not the apical margin bearing narrowly separated rows of large and prominent granules with rounded apices............................................................................. S. granulatus (Eggers)

4 First fifth of elytral disc at base rugose ( Fig. 8 ).............................................................. 5

- First fifth of elytral disc at base granulate ( Fig. 7 )............................................................ 6

5 Elytral striae strongly impressed on the elytral disc........................................... S. obesus (Browne)

- Elytral striae weakly impressed on the elytral disc............................................ S. borneensis Bright

6 Elytral interstrial setae appressed; body size larger, 2.0– 2.7 mm and stouter 1.92–2.08 × as long as wide ( Fig. 6 )........................................................................ S. insulanus Schiffer, Smith & Cognato sp. nov.

- Elytral interstrial setae erect; body size smaller, 1.6–1.95 mm and more elongate, 2.1–2.4 × as long as wide ( Fig. 7 )....... 7

7 Main elytral interstrial setae and ground vestiture similar sizes; ground vestiture longer than width of an interstria............................................................................................... S. pilosus (Eggers)

- Main elytral interstrial setae longer than ground vestiture; ground vestiture shorter than width of an interstria................................................................................................. S. niisimai (Eggers)

Figures

FIGURE 3. Sueus borneensis, female (Indonesia, Sulawesi Utara, RABC) 2.25 mm A) dorsal view; B) lateral view; C) frons; D) posterolateral view.

FIGURE 4. Sueus chatterjeei sp. nov. female holotype (USNMENT01595085), 2.4 mm A) dorsal view; B) lateral view; C) frons; D) posterolateral view.

FIGURE 5. Sueus granulatus female (MSUC_ARC_320283), 2.43 mm A) dorsal view; B) lateral view; C) frons; D) posterolateral view.

FIGURE 6. Sueus insulanus sp. nov. female holotype, 2.0 mm A) dorsal view; B) lateral view; C) frons; D) posterolateral view.

FIGURE 7. Sueus niisimai female (MSUC_ARC_320284) 1.7 mm A) dorsal view; B) lateral view; C) frons; D) posterolateral view.

FIGURE 8. Sueus obesus female (Thailand, Suratthani) 2.5 mm A) dorsal view; B) lateral view; C) frons; D) posterolateral view.

FIGURE 10. Sueus striatulus female holotype (NHMW), 1.75 mm A) dorsal view; B) lateral view; C) frons; D) posterolateral view.