Taxonomic history

Xyleborus fornicator Eggers, 1923: 184.

Euwallacea fornicator (Eggers): Wood and Bright, 1992: 690 (as a synonym of E. fornicatus).

Synonyms

Xyleborus schultzei Schedl, 1951a: 68. Smith et al., 2019: 6.

Diagnosis

2.2–2.37 mm long (mean = 2.3 mm; n = 5); 2.15−2.30 times as long as wide. This species is distinguished by the pronotum basic (type 2) when viewed dorsally, anterior margin appearing rounded; elytral declivity rounded; declivital face convex; protibia outer margin rounded with 6 or 7 socketed denticles, denticles small, their sockets small; declivital surface shining; interstriae bearing sparse small granules; posterolateral margin of declivity costate.

This species is nearly identical to E. malloti and E. n. sp. 5 and can be separated by the elytral bases rounded and posterolateral declivital margin carinate and never granulate.

This species is part of the Euwallacea fornicatus species complex, and the most reliable method to ensure accurate identification of these species is through generation of COI barcoding sequences (Gomez et al. 2018b, Smith et al. 2019). Gomez et al. (2018b; figure 1) provide morphological characters for separating the species based on measurements of elytral length (lateral view; diagonally measured from the elytral base to the apex) and pronotal length (lateral view; on a diagonal from pronotal apex to pronotal base). Species can be diagnosed using the combination of measurements given in Smith et al. 2019:

species total length
(dorsal)
length/width ratio
(dorsal)
elytral length
(lateral; diagonal)
pronotal length
(lateral; diagonal)
elytral width
(dorsal)
pronotal width
(dorsal)
protibial
denticles
E. fornicatior 2.20–2.37 2.15−2.35 1.40–1.46 1.02–1.06 0.48–0.52 1.00–1.06 6−7
E. fornicatus 2.60−2.70 2.25−2.36 1.44–1.72 1.02–1.16 0.48–0.62 1.00–1.14 8–9
E. kuroshio 2.40−2.80 2.17−2.40 1.50–1.82 1.08–1.16 0.52–0.56 1.06–1.16 8−11
E. perbrevis 2.30−2.50 2.46−2.55 1.42–1.68 1.04–1.16 0.48–0.56 1.02–1.14 7−10

 

May be confused with

This species is part of the Euwallacea fornicatus species complex along with E. fornicatus, E. kuroshio, and E. perbrevis from which it is difficult to distinguish. The species is also similar to E. andamanensis, E. geminus, E. malloti, E. neptis, E. semirudis, E. testudinatus, and E. velatus.

Distribution

China (Sichuan), Federated States of Micronesia, India (Assam, Kerala, Tamil Nadu), Indonesia (Java, Sulawesi), East and West Malaysia, Papua New Guinea, Philippines, Singapore, Sri Lanka, Taiwan, and Thailand (Smith et al. 2019)

Host plants

recorded from tea (Camellia sinensis) (Theaceae), Albizzia and Tephrosia (Leguminosae) (Beeson 1930, Schedl 1931, Eggers 1936a), durian (Durio zibethinus) (Malvaceae), and breadfruit (Artocarpus altilis) (Moraceae) (Smith et al. 2019)

DNA data

COI sequences are available from Stouthamer et al. (2017), Gomez et al. (2018b) and Smith et al. (2019): KU726991MH276930MH276931MH276932MH276933MH276934MH276935