Truncaudum agnatum (Eggers, 1923)

Smith, Sarah M., Beaver, Roger A. & Cognato, Anthony I., 2020, A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China, ZooKeys 983, pp. 1-442 : 1

Truncaudum agnatum (Eggers, 1923) Fig. 78A, B, E

Xyleborus agnatus Eggers, 1923: 197.

Truncaudum agnatum (Eggers): Hulcr and Cognato 2010a: 25.

Xyleborus polyodon Eggers, 1923: 196. Synonymy: Hulcr 2010: 114.

Xyleborus gratiosus Schedl, 1942a: 199. Synonymy: Hulcr and Cognato 2010a: 25.

Xyleborus nutans Schedl, 1942a: 199. Synonymy: Bright and Skidmore 1997: 4, 151.

Xyleborus delicatus Schedl, 1955a: 300. Synonymy: Hulcr and Cognato 2010a: 25.

Xyleborus subagnatus Wood, 1992: 85. Synonymy: Hulcr and Cognato 2010a: 25.

Type material.

Paralectotype Xyleborus nutans (NHMUK). Lectotype Xyleborus polyodon (NMNH).

Diagnosis.

2.1-2.9 mm long (mean = 2.4 mm; n = 5); 2.44-2.9 × as long as wide and densely pubescent. This species is distinguished by the declivity obliquely truncate, margins rounded; declivital interstriae 1 flat; and large size.

This species is strikingly similar to many small Cyclorhipidion species and is distinguished by the characters given for the genus.

Similar species.

Small Cyclorhipidion spp.

Distribution.

Australia, ‘Borneo’, Federated States of Micronesia, Indonesia (Java, Maluku, Sulawesi, Sumatra), New Caledonia, New Guinea, Palau, Philippines, Solomon Islands, Thailand.

Host plants.

Polyphagous ( Browne 1961b; Ohno 1990).

Remarks.

Both molecular and morphological data suggest that this is a complex of species. Further study of the complex is needed.

Figures

Figure 78. Dorsal, lateral and declivital view of Truncaudum agnatum, 2.1 - 2.9 mm (A, B, E), and T. bullatum holotype, 1.9 mm (C, D, F).