Ambrosiophilus sexdentatus ( Eggers, 1940 ) Eggers, 1940

Hulcr, Jiri & Cognato, Anthony I., 2009, Three new genera of oriental Xyleborina (Coleoptera: Curculionidae: Scolytinae), Zootaxa 2204, pp. 19-36 : 24

Ambrosiophilus sexdentatus ( Eggers, 1940) comb. n.

Previous genus: Streptocranus

Compared to holotype in USNM

Diagnosis: Antenna type 4–5. Posteriorly prolonged pronotum. Prolonged elytra, declivity impressed along suture, surrounded by an elevated sulcus from elevated interstriae 2 and 3. The sulcus reaches almost to the bases of elytra, and is armed with conspicuous teeth. The species is variable in size.

Length: 2.8–3.2 mm.

Discussion. The species was described as Xyleborus by Eggers (1940), then transferred to Ambrosiodmus ( Wood & Bright, 1992) , followed by a transfer to Streptocranus ( Hulcr et al., 2007) . Its placement into Ambrosiophilus herein is based on a survey of more species and characters than by Hulcr et al. (2007), and has 100% posterior probability in a multi-gene Bayesian phylogenetic analysis (Cognato et al., unpublished).The holotype from Java has the same arrangement of teeth and striae as specimens from New Guinea. It is slightly shorter (5–10%), the declivital excavation is a little shallower and enclosed by less conspicuous wall. Ambrosiodmus optatus (which may eventually be transferred to Ambrosiophilus ) from Australia closely resembles A. sexdentatus , but differs in the shallowly excavated declivity. Both A. sexdentatus and A. optatus have mostly orange to light brown color.

Biology: Recorded as an associate of Beaverium sundaensis (J.H., unpubl.) but the ecological significance of the record is uncertain.

Examined material: Indonesia, Java, Batoerrad, (holotype, USNM); PNG: Madang Prov. (8), Oro Prov. (2), J. Hulcr 2002–2006.