Crematogaster baduvi

Specimens from Endau Rompin National Park, W. Malaysia and Brunei were collected by fogging method. (Hosoishi and Ogata 2016)

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 surfaces of mesosoma, propodeal dorsum (with rugulae), and the very long propodeal spines that are divergent and straight toward tip. This species is similar to C. brunensis, but can be distinguished from it by the larger head (HW 0.47–0.57, HL 0.48–0.59 vs. 0.43–0.47 and 0.46–0.49 in the latter), shorter scape (SI 98–108 vs. 113–118) and shorter propodeal spines (PSL 0.15–0.21 vs. 0.20–0.22).

Specimens from Brunei have the anterior mesonotal ridges higher than posterior mesonotal ridges in lateral view.

Distribution
Malaysia (Peninsula), Brunei, and Indonesia (Krakatau, Sumatra, Java).

Distribution based on Regional Taxon Lists
Indo-Australian Region: Brunei Darussalam, Indonesia, Krakatau Islands, Malaysia.

Nomenclature

 * . Crematogaster baduvi Forel, 1912d: 106 (w.) INDONESIA (Java).
 * Type-material: holotype (?) worker.
 * [Note: no indication of number of specimens is given.]
 * Type-locality: Indonesia: Java, Nusa Kambangan, iii. (E. Jacobson).
 * Type-depository: MHNG.
 * [Misspelled as batuvi by Crawley, 1924: 394, Chapman & Capco, 1951: 96.]
 * Forel, 1913k: 77 (q.); Menozzi, 1935a: 104 (m.).
 * Combination in C. (Orthocrema): Emery, 1922e: 131.
 * Status as species: Forel, 1913k: 77; Emery, 1922e: 131; Crawley, 1924: 394; Menozzi, 1935a: 104; Chapman & Capco, 1951: 96; Bolton, 1995b: 148; Hosoishi & Ogata, 2016a: 566 (redescription) ; Khachonpisitsak, et al. 2020: 86.
 * Distribution: Brunei, Indonesia (Java, Krakatau, Sumatra), Malaysia (Peninsula), Thailand.

Worker
Hosoishi and Ogata (2016) - (n = 17): HW 0.47–0.57; HL 0.48–0.59; CI 92–100; SL 0.47–0.58; SI 98–108; EL 0.11–0.14; PW 0.26–0.35; WL 0.60–0.72; PSL 0.15–0.21; PtL 0.23–0.28; PtW 0.15–0.20; PtH 0.13–0.16; PpL 0.13–0.16; PpW 0.16–0.20; PtHI 54–67; PtWI 65–83; PpWI 113–146; WI 90–107.

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 extend posteriad to tips of propodeal spines; anterior ridges usually as high as posterior ridges. 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 weakly developed as angulate tubercle. Postpetiole in lateral view with strongly convex dorsum, distinctly higher than petiole, in dorsal view as wide as petiole, globular, not bilobed. Venter of postpetiole convex but without distinct process.

Integument essentially smooth and shining. Dorsal surface of head smooth and shining. Mandibles with feeble rugulae and smooth interspaces. Clypeus smooth and shining without distinct longitudinal rugulae, but short rugulae present anteriorly in some specimens. Dorsal and lateral surfaces of pronotum smooth and shining; anterolateral shoulders of pronotum with 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 sculptured. Dorsal and lateral surfaces of postpetiole smooth and shining.

Standing pilosity sparse. Dorsal face of head with long erect 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 appressed setae. Mesosoma with two pairs of long erect and stout setae (ps1PN and psaMN) that are much longer than other erect setae. Posterolateral tubercles of petiole posteriorly with one pair of long setae. Postpetiole with one pair of long setae on disc posteriorly. Fourth abdominal tergite with erect setae sparsely, but no decumbent to appressed setae.

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

Type Material
Hosoishi and Ogata (2016) - One syntype worker, Nusa Kambangan, Java, Indonesia (, examined).

References based on Global Ant Biodiversity Informatics

 * Abe T., S. Yamane, and K. Onoyama. Ants collected on the Krakatau Islands 100 years after the great eruptions. Biogeography 14: 65-75.
 * Blaimer B. B. 2012. Acrobat ants go global  Origin, evolution and systematics of the genus Crematogaster (Hymenoptera: Formicidae). Molecular Phylogenetics and Evolution 65: 421-436.
 * Forel A. 1912. Ameisen aus Java beobachtet und gesammelt von Edward Jacobson. III. Theil. Notes Leyden Mus. 34: 97-112
 * Forel A. 1913. Wissenschaftliche Ergebnisse einer Forschungsreise nach Ostindien ausgeführt im Auftrage der Kgl. Preuss. Akademie der Wissenschaften zu Berlin von H. v. Buttel-Reepen. II. Ameisen aus Sumatra, Java, Malacca und Ceylon. Gesammelt von Herrn Prof. Dr. v. Buttel-Reepen in den Jahren 1911-1912. Zoologische Jahrbücher. Abteilung für Systematik, Geographie und Biologie der Tiere 36:1-148.
 * 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.
 * Hosoishi S. and K. Ogata. 2009. A check list of the ant genus Crematogaster in Asia (Hymenoptera: Formicidae). Bull. Inst. Trop. Agr. Kyushu Univ. 32: 43-83.
 * Menozzi C. 1935. Formiche indo-australiane del genere Crematogaster Lund raccolte da W. Karawaiew. Konowia. 14: 103-116.
 * Yamane S. 2013. A Review of the ant fauna of the Krakatau Islands, Indonesia. Bull. Kitakyushu Mus. Nat. Hist. Hum. Hist. Ser: A, 11: 1-66
 * Yamane S., H. O. Tanaka, Y. Hashimoto, M. Ohashi, and T. Itioka. 2018. A list of ants from Lambir Hills National Park and its vicinity, with their biological information: Part I. Subfamilies Myrmicinae and Pseudomyrmecinae. Contributions from the Biological Laboratory Kyoto University 30(4): 173-235.