Crematogaster fraxatrix

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Crematogaster fraxatrix
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Crematogaster
Species: C. fraxatrix
Binomial name
Crematogaster fraxatrix
Forel, 1911

Crematogaster fraxatrix casent0193576 p 1 high.jpg

Crematogaster fraxatrix casent0193576 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of Crematogaster fraxatrix.

Identification

This species is similar to Crematogaster chhangi, but can be distinguished by the oval-shaped propodeal spiracles and weakly developed subpetiolar process in the worker caste.(Hosoishi and Ogata 2014)

Distribution

Southern Thailand and Malaysia (Peninsular and Borneo).

Distribution based on Regional Taxon Lists

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


Distribution based on AntMaps

AntMapLegend.png

Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Known only from the worker caste.

Hosoishi and Kazuo 2015. Figs 12 – 15. Petiole in dorsal view. 12, Crematogaster osakensis; 13, Crematogaster teranishii; 14, Crematogaster inflata; 15, Crematogaster fraxatrix.

Nomenclature

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

  • fraxatrix. Crematogaster fraxatrix Forel, 1911a: 28 (w.) BORNEO. Combination in C. (Acrocoelia): Emery, 1922e: 151; in C. (Crematogaster): Bolton, 1995b: 166.

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

Description

Worker

Hosoishi and Ogata (2014) - Measurements and indices. HW 0.7–0.98; HL 0.64–0.93; CI 105–114; SL 0.58–0.68; SI 69–91; EL 0.13–0.18; PW 0.37–0.62; WL 0.69–0.95; PSL 0.13–0.21; PtL 0.18–0.25; PtW 0.18–0.25; PtH 0.13–0.17; PpL 0.11–0.15; PpW 0.16–0.23; PtHI 65–74; PtWI 94–111; PpWI 123–155; WI 83–92 (thirteen workers measured).

Workers with weak polymorphism in size. Posterior corners of head rounded in smaller worker, but squared in larger workers. Anterior clypeal margin slightly concave in the median portion. Compound eyes not projecting beyond lateral margins of head in full face view. Scape reaching posterior corner of head. Antennal club 3-segmented. Pronotal dorsum with distinct ridges laterally. Mesonotal dorsum with lateral ridges. Mesonotum slightly higher than pronotum in larger workers in lateral view. Metanotal groove straight in dorsal view, deep and forming a concave region between mesonotum and propodeum. Propodeal spiracles dorso-ventrally oval, located on lateral sides of propodeum; the horizontal diameter slightly larger than the vertical diameter even in smaller workers. Propodeal spines long, directed upward and straight. Petiole broader in the middle portion. Subpetiolar process developed as small, blunt denticle. Postpetiole weakly bilobed, but without longitudinal median sulcus. Petiole slightly wider than postpetiole in dorsal view.

Sparsely hirsute with erect setae. Scape with abundant erect to suberect setae. Dorsal face of head with suberect setae. Clypeus with suberect setae; one pair of longer setae directed medially on anteriormost portion. Anterior clypeal margin with one single setae and one pair of longer setae, mixed with some shorter setae on the sides. Mesosoma with sparse erect setae. Fourth abdominal tergite with sparse erect to suberect setae.

Dorsal surface of head generally smooth and shining, but feeble rugulae between frontal carinae; longitudinal rugulae surrounding antennal sockets and on gena. Clypeus weakly striated with longitudinal rugulae. Pronotum striated with feeble rugulae. Mesonum weakly striated with feeble rugulae. Lateral surface of pronotum smooth and shining. Mesopleuron sculptured, but the central portion relatively smooth. Lateral surface of propodeum with feeble rugulae.

Body color reddish-brown to black.

Type Material

Hosoishi and Ogata (2014) - MALAYSIA: Sarawak, Borneo (Haviland). Musee d'Histoire Naturelle Genève, Naturhistorisches Museum, Basel, examined. Lectotype worker by present designation: top specimen of three specimens of one pin.

References

  • Emery, C. 1922c. Hymenoptera. Fam. Formicidae. Subfam. Myrmicinae. [part]. Genera Insectorum 174B: 95-206 (page 151, Combination in C. (Acrocoelia))
  • Forel, A. 1911a. Fourmis de Bornéo, Singapore, Ceylan, etc. récoltées par MM. Haviland, Green, Winkler, Will, Hose, Roepke et Waldo. Rev. Suisse Zool. 19: 23-62 (page 28, worker described)