Tetramorium Mayr

Eguchi, K., Viet, B. T. & Yamane, S., 2011, Generic synopsis of the Formicidae of Vietnam (Insecta: Hymenoptera), Part I - Myrmicinae and Pseudomyrmicinae., Zootaxa 2878, pp. 1-61: 30

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Tetramorium Mayr


Tetramorium Mayr  HNS  , 1855

Taxonomy. The genus Tetramorium  HNS  is assigned to the tribe Tetramoriini  HNS  (for a complete taxonomic history see Bolton 2003). The Oriental species were revised by Bolton (1976, 1977). Workers of Vietnamese species have the following features.

Worker monomorphic; head in full-face view subrectangular, with rounded posterior corners; frontal carina usually (but not always) long and distinct; antennal scrobe weak or absent; anteromedian margin of clypeus weakly convex, often with a weak emargination at midpoint, lacking any denticles or teeth; an isolated median seta absent; posteromedian portion of clypeus very broadly inserted between frontal lobes; lateral portion of clypeus modified into a distinct ridge or wall in front of antennal insertion; mandible triangular; masticatory margin with apical and 1 or 2 larger preapical teeth followed by some smaller teeth or minute denticles; palp formula 4,3; antennae 11- or 12-segmented, with 3-segmented club; basal rim of shaft of antennal scape often forming an enlarged lobe expanding ventrad; eye medium to large in size; mesosoma in lateral view weakly convex dorsad; promesonotal suture absent dorsally; metanotal groove absent; anterior part of mesopleuron forming a flange projecting over basal part of fore coxa; propodeal spine present, varying in size and shape; propodeal lobe well developed usually as a triangular lamella or spinose projection but sometimes as a subrectangular or round lamella; petiole pedunculate, with distinct node; a tiny denticle or process present on the anteriormost part of ventral face of peduncle (it is often concealed by mesopleuron and or hind coxa in lateral view); gastral shoulder distinct to absent; apex of sting with a small lamellate appendage; head and mesosoma usually strongly reticulate or rugoso-reticulate.

The worker of Tetramorium  HNS  is similar to those of Rhoptromyrmex  HNS  and Myrmica  HNS  (for distingusihing characters see under the latter genera)

Vietnamese species. Four species have been described from Vietnam: indosinense Wheeler  HNS  [= sp. eg-13] (Type locality: Ha Noi; other locality: Ba Vi); infraspinosum Karaviev  HNS  (type locality: Cau Da); kieti Roncin (type locality: Vietnam); secure Roncin (type locality: Vietnam). An additional 21 species have recognized by us from Vietnam: flavipes Emery  HNS  [= sp. eg-4; = sp. 39 of SKY: Yamane et al., 2003] (Ba Vi, Chua Yen Tu, Cuc Phuong, Nam Cat Tien, Phu Quoc, Pu Mat, Tay Yen Tu, Van Ban); kheperra  HNS  (Bolton) [= sp. eg-9] (Ba Vi, Phu Quoc, Tay Ye n T u); lanuginosum Mayr  HNS  [= sp. eg-17] (Ba Vi, Bac Kan, Tam Dao); nipponense Wheeler  HNS  [= sp. eg-5] (Ba Be, Ba Vi, Cuc Phuong, Sa Pa, My Yen, Pu Mat, Tay Yen Tu, Van Ban); sp. eg-1 (Sa Pa); sp. eg-2 [= kraepelini Forel  HNS  : Eguchi et al., 2005] (Ba Vi, Nam Cat Tien, Phu Quoc, Pu Mat, Tay Yen Tu); sp. eg-3 [= sp. 32 of SKY: Eguchi et al., 2005] (Ba Vi, Chua Yen Tu, Tam Dao, Tay Yen Tu, Van Ban); sp. eg-6 [cf. pacificum Mayr  HNS  ] (Sa Pa, Pu Mat); sp. eg-7 (Sa Pa); sp. eg-8 (Ba Be); sp. eg-10 (Tay Yen Tu); sp. eg-12 (Ba Vi, Pu Mat); sp. eg-14 (Binh Chau-Phuoc Buu); sp. eg-15 [= bicarinatum  HNS  (Nylander): Eguchi et al., 2005] (Tam Dao); sp. eg-16 [= smithi Mayr  HNS  : Eguchi et al., 2005] (Ba Vi); sp. eg-18 [= walshi  HNS  (Forel): Yamane et al., 2003] (Cuc Phuong, My Yen, Pu Mat); sp. eg-19 (Ba Be); sp. eg-21 (Cuc Phuong); sp. eg-22 (Nam Cat Tien); sp. eg-23 (Nam Cat Tien, Nui Chua); sp. eg-24 (Nam Cat Tien).

Bionomics. Tetramorium  HNS  species inhabit various habitats such as open lands, grasslands, forest edges and well-developed forests. Their nests are usually found in rotting logs, twigs, wood fragments, under stones and in soil. Workers forage mainly on the ground.