Crematogaster brunensis

Crematogaster brunensis
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Family:	Formicidae
Subfamily:	Myrmicinae
Tribe:	Crematogastrini
Genus:	Crematogaster
Species group:	baduvi
Species:	C. brunensis
Binomial name
	Crematogaster brunensis; Hosoishi & Ogata, 2016

The type material was collected from a fogging sample. Heterick & Kitching (2022) collected this species in the canopy of a lowland dipterocarp forest in Brunei.

Identification

Hosoishi and Ogata (2016) - In the worker this species can be distinguished from all other members of the Crematogaster baduvi group by the smooth and shining surface of mesosoma, smooth surface of propodeal dorsum, and propodeal spines developed straight at the tip. This species is similar to C. baduvi, but can be distinguished from it by the smaller head (HW 0.43–0.47, HL 0.46–0.49 vs. 0.47–0.57 and 0.48–0.59 in the latter) and longer propodeal spines (PSL 0.20–0.22 vs. 0.15–0.21).

Keys including this Species

Key to Asian Crematogaster Orthocrema species

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: Brunei Darussalam (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.

Biology

Castes

Worker


.

Nomenclature

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

brunensis. Crematogaster brunensis Hosoishi & Ogata, 2016a: 579, fig. 102 (w.) BORNEO (Brunei).
- Type-material: holotype worker, 5 paratype workers.
- Type-locality: holotype Brunei: nr Lamunin, Bukit Sulang, BM1982-388, fogging, 20.viii.-10.ix.1982 (N.E. Stork); paratypes with same data.
- Type-depositories: BMNH (holotype); CASC, KUEC, MBSM, MHNG, TNHM (paratypes).
- Distribution: Brunei.

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

Description

Worker

(n = 6): HW 0.43–0.47; HL 0.46–0.49; CI 92–100; SL 0.51–0.53; SI 113–118; EL 0.12–0.13; PW 0.26–0.29; WL 0.60–0.63; PSL 0.20–0.22; PtL 0.23–0.26; PtW 0.14–0.17; PtH 0.14–0.15; PpL 0.12–0.13; PpW 0.15–0.17; PtHI 56–61; PtWI 60–67; PpWI 123–133; WI 100–107.

Workers monomorphic. Head round in full-face view. Mandibles with four teeth arranged at an equal distance, apical and subapical teeth large, basal two teeth smaller. Anterior clypeal margin convex in medial portion. Compound eyes distinctly projecting beyond lateral margins of head in full-face view. Scapes exceeding posterolateral corners of head.

Pronotal collar with concave anterior margin in dorsal view, slightly lower than pronotum in lateral view. Pronotal dorsum without distinct ridges laterally. Mesonotal dorsum with lateral ridges that irregularly extend posteriad to tips of propoedal spines. Pronotum and mesonotum in lateral view forming evenly arched, continuous dorsal outline. Metanotal groove in dorsal view transverse, almost straight in median portion, forming shallow concavity that is laterally margined by ridges. Propodeal spiracles oval, situated at posterolateral corners of propodeum, apart from metapleural gland bullae. Propodeal spines developed, longer than diameter of propodeal spiracles, in dorsal view strongly divergent.

Petiole in dorsal view with subparallel sides and narrow short peduncle anteriorly, distinctly longer than wide. Posterior portion of petiole with short process that is slightly higher than posterior margin of petiole disc in lateral view. Subpetiolar process undeveloped. Postpetiole in lateral view with strongly convex dorsum, distinctly higher than petiole, in dorsal view as wide as petiole, globular, not bilobed. Subpostpetiolar process undeveloped, but venter of postpetiole convex.

Integument essentially smooth and shining. Dorsal surface of head smooth and shining. Mandibles with feeble rugulae and smooth interspaces. Clypeus generally smooth and shining, but with one pair of longitudinal rugulae; rugulae not extending to the posterior clypeal margin. Dorsal and lateral surfaces of pronotum smooth and shining; anterolateral shoulders of pronotum with feeble rugulae. Mesopleura generally sculptured, but sometimes smooth except for their marginal areas in some specimens. Dorsal surface of propodeum generally smooth and shining, but with rugulae dorsolateral areas. Dorsal surface of petiole smooth and shining. Lateral surface of petiole weakly sculptured. Dorsal and lateral surfaces of postpetiole smooth and shining.

Standing pilosity sparse. Dorsal face of head with long erect (three pairs) and short appressed setae sparsely. Clypeus with two pairs of long setae in anterior portion, one directed upward and the other downward. Anterior clypeal margin with one pair of long setae medially and some pairs of short setae laterally. Scapes with suberect to decumbent setae. Mesosoma with three pairs of long erect and stout setae (ps1PN, psaMN, and pspMN) that are much longer than other erect setae. Posterolateral tubercles of petiole posteriorly with one pair of long setae. Postpetiole with two pairs of long setae on disc anteriorly, posteriorly. Fourth abdominal tergite with erect setae sparsely, but no decumbent to appressed setae.

Body red-brown. Apical two flagellar segments light yellow, contracting with other flagellar segments that are yellow.

Type Material

Holotype worker. nr. Lamunin, Bukit Sulang, BRUNEI, B. M. 1982-388 Fogging, 20.viii–10.ix.1982 (N. E. Stork) (The Natural History Museum). Paratypes. Five workers, same data as holotype (California Academy of Sciences, Institute for Tropical Biology and Conservation, Entomological Laboratory and Institute of Tropical Agriculture, Faculty of Agriculture, Kyushu University, Musee d'Histoire Naturelle Genève, Natural History Museum of the National Science Museum).

Etymology

The specific name refers to the country of origin, Brunei.

References

References based on Global Ant Biodiversity Informatics

Hosoichi S., and K. Ogata. 2016. Systematics and biogeography of the ant genus Crematogaster Lund subgenus Orthocrema Santschi in Asia (Hymenoptera: Formicidae). Zoological Journal of the Linnean Society 176: 547–606.