Crematogaster imperfecta

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Crematogaster imperfecta
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Crematogaster
Species group: ranavalonae
Species: C. imperfecta
Binomial name
Crematogaster imperfecta
Hosoishi, 2015

Hosoishi,-2015-21 hal.jpg

Hosoishi,-2015-21 had.jpg

Nothing is known about the biology of Crematogaster imperfecta.


A member of the Crematogaster ranavalonae-group.

This species is very similar to Crematogaster hashimi, but differs in having elliptical propodeal spiracles and a slender petiole.

Keys including this Species


Latitudinal Distribution Pattern

Latitudinal Range: 4.199° to 4.199°.

Tropical South

Distribution based on Regional Taxon Lists

Indo-Australian Region: Malaysia (type locality).

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.


Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.





The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • imperfecta. Crematogaster imperfecta Hosoishi, 2015: 82, fig. 32 (w.) BORNEO (East Malaysia: Sabah).
    • Type-material: holotype worker, 5 paratype workers.
    • Type-locality: holotype Malaysia: Borneo, Sabah, Sg. Kalang, 800-1000 m., 23.ii.1997 (Sk. Yamane); paratypes: 3 workers with same data, 2 workers Malaysia: Sarawak, Miri, Lambir Nat. Park, Tower Region, 26.i.1983 (Sk. Yamane).
    • Type-depositories: MBSM (holotype); BMNH, CASC, KUEC, SKYC, TNHM (paratypes).
    • Distribution: Malaysia (Sabah, Sarawak).

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



(type workers, n = 6). HW 0.77-0.87; HL 0.72-0.81; CI 103-108; SL 0.63-0.71; SI 78-83; EL 0.16-0.18; PW 0.48-0.54; WL 0.86-0.95; PSL 0.02-0.04; PtL 0.24-0.26; PtW 0.21-0.23; PtH 0.13-0.15; PpL 0.14-0.16; PpW 0.22-0.26; PtHI 54-60; PtWI 88-92; PpWI 156-167; WI 104-114.

Head appearing subquadratic in front view. Mandible weakly striate, with four teeth, apical and subapical teeth large, basal two teeth smaller. Scape exceeding posterior corner of head, with appressed setae, each of which is less than width of scape in length. Compound eye large and slightly projecting beyond lateral margin of head in full face view.

Ventrolateral katepisternal ridge indistinct posteriorly. Propodeal spine undeveloped, but as small tubercule in some workers; length distinctly shorter than propodeal spiracle. Propodeal spiracle large, situated close to the propodeal declivity in lateral view, directed laterally.

In dorsal view, shape of petiole scoop with convex side, longer than broad. Anterolateral corner of petiole developed. Petiolar spiracle small, less than half of propodeal spiracle in size. In dorsal view, postpetiole slightly broader than long. Postpetiole weakly bilobed, but without longitudinal median sulcus. Postpetiole as wide as petiole in dorsal view.

Integument essentially smooth and shiny. Clypeus smooth and shiny without rugulae. Malar region smooth and shiny. Dorsal surface of promesonotum smooth and shiny. Lateral surface of pronotum smooth and shiny. Mesopleuron smooth and shiny. Dorsal surface of propodeum smooth and shiny. Lateral propodeum smooth and shiny.

Erect pilosity almost absent. Dorsum of head, clypeus, mesosoma and fourth abdominal tergite with short and appressed sparse setae. Clypeus with longer setae on anteriormost portion, directed medially. Anterior clypeal margin with two pairs of longer setae on median portion, with some shorter setae on side. No erect setae on pronotal shoulder. Posterolateral tubercle with some appressed setae. Ventral surface of petiole without setae. Postpetiole without longer erect setae posteriorly. Fourth abdominal tergite with appressed setae.

Body color reddish brown.

Type Material

  • Holotype, worker, Sg. Kalang, 800–1000 m alt., Sabah, Malaysia, 23.ii.1997, Sk. Yamane, KUMANT020, ITBC.
  • Paratype, 3 workers, Sg. Kalang, 800–1000 m alt., Sabah, Malaysia, 23.ii.1997, Sk. Yamane, CASC: KUMANT021; KUM: KUMANT022; SKYC: KUMANT023.
  • Paratype, 2 workers, Tower Region, Lambir NP, Miri, Sarawak, Malaysia, 26.i.1983, Sk. Yamane, Canopy Ecol., BMNH: KUMANT024; THNHM: KUMANT025.


The specific name refers to the undeveloped propodeal spines.


References based on Global Ant Biodiversity Informatics

  • Hosoishi S. 2015. Revision of the Crematogaster ranavalonae-group in Asia, with description of two new species (Hymenoptera, Formicidae). Journal of Hymenoptera Research 42: 63-92.