OLIGOMYRMEX

(Subfamily Myrmicinae)

Taxonomy

The genus Oligomyrmex was established by Mayr (1867). Fernández (2004) placed Afroxyidris, Oligomyrmex and Paedalgus as junior synonyms of Carebara, but here we do not follow Fernández’s treatment because of his insufficient consideration of Old World taxa. The workers of Vietnamese species have the following features (see Bolton 2003; Ettershank 1966).

Images


Oligomyrmex sp. eg-8, major, body in lateral view.


Oligomyrmex sp. eg-8, major, head in full-face view.


Oligomyrmex sp. eg-8, minor, body in lateral view.


Oligomyrmex sp. eg-8, minor, head in full-face view.

Distribution

Fifteen species have been known from Vietnam. The species marked with asterisks have not yet been examined by us.

*bouvardi Santschi Type locality: Mi Tho; Ho Chi Minh City
*capreolus Wheeler Type locality: Van Phu
*cribriceps (Wheeler) Type locality: Dong Mo
sp. eg-1 Chua Yen Tu (Quang Ninh); Cuc Phuong NP (Ninh Binh); Tay Yen Tu NP (Bac Giang); Van Ban (Lao Cai)
sp. eg-2 Sa Pa (Lao Cai)
sp. eg-3 Cuc Phuong NP (Ninh Binh); Nam Cat Tien NP (Dong Nai); Van Ban (Lao Cai)
sp. eg-4 Cuc Phuong NP (Ninh Binh); Nam Cat Tien NP (Dong Nai); Phu Quoc NP (Kien Giang); Pu Mat NP (Nghe An); Sa Pa (Lao Cai); Van Ban (Lao Cai)
sp. eg-5 Ba Be NP (Bac Can); Sa Pa (Lao Cai); Tay Yen Tu NP (Bac Giang)
sp. eg-6 Ba Be NP (Bac Can); Binh Chau-Phuoc Buu NP (Ba Ria-Vung Tau) Nam Cat Tien NP (Dong Nai)
sp. eg-7 Cuc Phuong NP (Ninh Binh); Tam Dao NP (Vinh Phuc); Tay Yen Tu NP (Bac Giang)
sp. eg-8 Binh Chau-Phuoc Buu NP (Ba Ria-Vung Tau); Phu Quoc (Kien Giang)
sp. eg-9 Nam Cat Tien NP (Dong Nai)
sp. eg-10 Van Ban (Lao Cai)
sp. eg-11 Phu Quoc NP (Kien Giang)
sp. eg-12 Nam Cat Tien NP (Dong Nai); Phu Quoc NP (Kien Giang)

Bionomics

Species richness and colony density seems to be high in humid forests. Nests of are found in rotting/rotten twig, wood fragment and log, inside outer wall of termite mounds and in the soil. Most species probably forage both on and under the ground (Eguchi & Bui 2009).

© Katsuyuki EGUCHI & BUI Tuan Viet, 2007. All rights reserved.