Crematogaster tanakai

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Crematogaster tanakai
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Crematogaster
Species: C. tanakai
Binomial name
Crematogaster tanakai
Hosoishi & Ogata, 2009



Specimen Label

This species was collected together with Crematogaster difformis nesting within the epiphyte Platycerium sp., suggesting the possibility that it might be associated with C. (P.) difformis.


A member of the subgenus Physocrema. This species is unique among the Asian Crematogaster ants in having a swollen dorsal median portion of the head.

Keys including this Species


Distribution based on Regional Taxon Lists

Indo-Australian Region: Borneo (type locality), Indonesia, Malaysia.

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb




The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • tanakai. Crematogaster (Physocrema) tanakai Hosoishi & Ogata, 2009b: 29, figs. 18, 30 (w.m.) BORNEO.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.



HW 1.66; HL 1.52; CI 109; SL 0.98; SI 59; EL 0.26; PW 0.74; WL 1.42; PSL 0; PtL 0.4; PtW 0.34; PtH 0.24; PpL 0.24; PpW 0.34; PtHI 60; PtWI 85; PpWI 142; WI 100 (one worker measured).

Scape not reaching posterior corner of head. Dorsal median portion of the head swollen.

In lateral view, promesonotum convex; mesonotum differentiated from pronotum; propodeum slightly raised relative to promesonotum. Anterior margin of pronotal collar slightly concave in dorsal view. Promesonotal suture visible. Metanotal groove convex posteriorly in dorsal view, deep and situated posteriorly to the posterior ridge of pronotum in lateral view; thorax strongly constricted in middle in dorsal view. In dorsal view, some longitudinal rugulae connecting between mesonotum and propodeum; the boundary distinct. Propodeal spiracle situated away from the metapleural gland orifice, the distance between them much greater than the propodeal spiracle diameter. Propodeal spines absent.

Clypeus sculptured with reticulate rugulae. Reticulate rugulae on pronotum and propodeum.

Standing pilosity sparse on dorsal face of head, abundant on promesonotum. Dorsal face of head with decumbent setae. Clypeus with short setae. Fourth abdominal tergite with suberect and appressed setae. Dorsal setae on posterior portion of fourth abdominal tergite directed medially.

Head red, mesosoma and gaster brown.

Type Material

HOLOTYPE worker from MALAYSIA: Lambir N. P., Miri, Sarawak, Borneo, 28. ix. 2005 (H. Tanaka) from the epiphyte Platycerium sp. (FRC). Paratypes. 1 male, same data as holotype (FRC).