Taxonomic history

Bostrichus volvulus Fabricius, 1775: 454.

Hylesinus volvulus (Fabricius): Fabricius, 1801: 394.

Xyleborus volvulus (Fabricius): Eggers, 1929: 47.

Synonyms

Xyleborus torquatus Eichhoff, 1868b: 146. Wood 1960: 69.

Xyleborus alternans Eichhoff, 1869: 280. Eggers 1929: 43.

Xyleborus badius Eichhoff, 1869: 280. Wood 1960: 69.

Xyleborus interstitialis Eichhoff, 1878b: 375. Wood 1982: 833.

Xyleborus guanajuatensis Dugès, 1887: 141. Wood 1983: 650.

Xyleborus grenadensis Hopkins, 1915a: 62, 65. Wood 1972: 200.

Xyleborus hubbardi Hopkins, 1915a: 62, 65. Schedl 1952d: 164.

Xyleborus rileyi Hopkins, 1915a: 62, 65. Bright 1968: 1318.

Xyleborus schwarzi Hopkins, 1915a: 62, 65. Bright 1968: 1318.

Xyleborus continentalis Eggers, 1920: 42. Beaver 2011: 285.

Xyleborus silvestris Beeson, 1929: 241. Wood 1989: 177.

Xyleborus vagabundus Schedl, 1949: 277. Wood 1972: 200.

Xyleborus granularis Schedl, 1950b: 898. Wood 1989: 177.

Diagnosis

2.5 mm long (mean = 2.5 mm; n = 5); 3.13 times as long as wide. This species is distinguished by the protibia obliquely triangular, broadest at distal third; elytral declivity smooth, shining (specimen must be dry); declivital interstriae 1, 3 armed with 2–3 pairs of moderate tubercles; interstriae 2 sparsely granulate along its entire length; and elytra unicolorus.
This species is almost identical to X. perforans and can be distinguished by the more elongate form (vs 2.67–2.89 times as long as wide) and by granules along the entire length of interstriae 2.

May be confused with

Xyleborus affinis, X. cognatus, X. ferrugineus, X. festivus, X. perforans, and X. pfeilii

Distribution

Circumtropical. Probably of American origin (Wood 2007, Gohli et al. 2016). In the study region, recorded from India (Nicobar Is.), Bangladesh, Myanmar, Taiwan, Thailand.

Host plants

strongly polyphagous (Browne 1961b, Schedl 1963a, as X. torquatus)

Remarks

Specimens from Southeast Asia were not available for examination. The measurements and diagnosis are based off of specimens Panama (Panama) and the United States (Florida).

Wood and Bright (1992) considered reports of the species ranging from Southeast Asia to the southwestern Pacific as referring to X. perforans. Some of the records from the countries of the study region given above may refer to X. perforans (Beaver et al. 2014). However, molecular studies have confirmed that the species does occur Bangladesh and Thailand (Gohli et al. 2016).

Wood and Bright (1992) postulated that X. pfeilii is a synonym of X. volvulus, and this was further suggested by Gomez et al. (2018). Though appearing quite similar, the protibia of these species are different. That of X. pfeilii is distinctly triangular while that of X. volvulus is obliquely triangular. Analysis of COI and CAD sequences has also shown that these species are separate lineages (Cognato et al. in prep) and that X. pfeilii is a good species.

DNA data

Sequences available for COI and CAD.

COI: HM064149

CAD: HM064327