Crematogaster treubi

Crematogaster treubi
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Family:	Formicidae
Subfamily:	Myrmicinae
Tribe:	Crematogastrini
Genus:	Crematogaster
Species:	C. treubi
Binomial name
Crematogaster treubi Emery, 1896 Specimen Labels
Subspecies
Crematogaster treubi apilis Forel, 1913
Synonyms
Crematogaster buddhae sic Forel, 1907 Crematogaster millardi Forel, 1902 Crematogaster treubi vastatrix Forel, 1911

Heterick & Kitching (2022) collected this species in a canopy malaise trap within a lowland dipterocarp forest in Brunei.

Identification

A member of the Crematogaster irritabilis group. Hosoishi and Ogata (2012) - This species is similar to C. kojimai, but can be distinguished by the long and slender propodeal spines.

Slight morphological variations are found not only in the specimens collected from different localities, but also within nest series collections. Some specimens collected in Bali have shorter propodeal spines in contrast to the usual long and slender spines. The mesopleuron is relatively smooth and shining in most specimens, but especially shining in Sepilok specimens or somewhat shagreened in Pulau Sebeku specimens. These variants are treated as intraspecific variation within C. treubi until molecular data are available.

Keys including this Species

• Key to Crematogaster brevis group workers

Distribution

Latitudinal Distribution Pattern

Latitudinal Range: 30° to -8.423056°.

North Temperate	North Subtropical	Tropical	South Subtropical	South Temperate

• Source: AntMaps

Distribution based on Regional Taxon Lists

Indo-Australian Region: Brunei Darussalam, Indonesia (type locality), Malaysia, Singapore.
Oriental Region: Cambodia, Laos, Myanmar, Thailand.
Palaearctic Region: China.

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.

Castes

Images from AntWeb

Syntype of Crematogaster treubi. Worker. Specimen code casent0904497. Photographer Will Ericson, uploaded by California Academy of Sciences.	Owned by MSNG, Genoa, Italy.

Syntype of Crematogaster treubi. Worker. Specimen code casent0905376. Photographer Z. Lieberman, uploaded by California Academy of Sciences.	Owned by MSNG, Genoa, Italy.

Syntype of Crematogaster millardi. Worker. Specimen code casent0908371. Photographer Z. Lieberman, uploaded by California Academy of Sciences.	Owned by MHNG, Geneva, Switzerland.

Syntype of Crematogaster treubi vastatrix. Worker. Specimen code casent0908373. Photographer Z. Lieberman, uploaded by California Academy of Sciences.	Owned by MHNG, Geneva, Switzerland.

Nomenclature

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

• treubi. Crematogaster treubi Emery, 1896f: 246 (w.) INDONESIA (Java).
  • Type-material: lectotype worker (by designation of Hosoishi & Ogata, 2012: 25), 2 paralectotype workers.
  • Type-locality: lectotype Indonesia: Java, Buitenzorg (= Bogor) (Massart); paralectotypes with same data.
  • Type-depositories: MSNG (lectotype); MHNG (paralectotypes).
  • Combination in C. (Orthocrema): Emery, 1922e: 132;
  • combination in C. (Acrocoelia): Santschi, 1928b: 34;
  • combination in C. (Mesocrema): Santschi, 1937e: 310.
  • Status as species: Emery, 1900d: 689; Emery, 1901g: 567; Emery, 1922e: 132; Stärcke, 1930: 374; Menozzi, 1935a: 106; Chapman & Capco, 1951: 99; Bolton, 1995b: 164; Terayama, 2009: 178 (in key); Hosoishi & Ogata, 2012: 25 (redescription); Jaitrong, Guénard, et al. 2016: 36; Khachonpisitsak, et al. 2020: 94; Wang, W.Y., Soh, et al. 2022: 78.
  • Senior synonym of millardi: Hosoishi & Ogata, 2012: 25.
  • Senior synonym of sic: Forel, 1911a: 25 (in text); Emery, 1922e: 132; Bolton, 1995b: 164.
  • Senior synonym of vastatrix: Hosoishi & Ogata, 2012: 25.
  • Distribution: Brunei, Cambodia, Indonesia (Bali, Java, Kalimantan, Sulawesi, Sumatra, Sunda Strait), Malaysia (Peninsula, Sabah, Sarawak), Myanmar, Singapore, Thailand.
  • Current subspecies: nominal plus apilis.
• millardi. Crematogaster millardi Forel, 1902c: 205 (w.) MYANMAR.
  • Type-material: lectotype worker (by designation of Hosoishi & Ogata, 2012: 25), 1 paralectotype worker.
  • Type-locality: lectotype Myanmar (“Burma”): Moulmain (Hodgson); paralectotype with same data.
  • Type-depository: MHNG.
  • Viehmeyer, 1916a: 125 (q.).
  • Combination in C. (Orthocrema): Emery, 1922e: 132;
  • combination in C. (Mesocrema): Santschi, 1928b: 33.
  • Status as species: Forel, 1903a: 684; Bingham, 1903: 135; Viehmeyer, 1916a: 125; Emery, 1922e: 132; Stärcke, 1930: 374; Menozzi, 1935a: 112 (in key); Chapman & Capco, 1951: 98; Bolton, 1995b: 157; Guénard & Dunn, 2012: 42.
  • Junior synonym of treubi: Hosoishi & Ogata, 2012: 25.
• sic. Crematogaster buddhae r. sic Forel, 1907a: 24 (w.) WEST MALAYSIA.
  • Type-material: syntype workers (number not stated).
  • Type-locality: Malaysia: Malacca, Kuala Lumpur (L. Biró).
  • Type-depositories: HNHM, MHNG.
  • Junior synonym of treubi: Forel, 1911a: 25 (in text); Emery, 1922e: 132; Bolton, 1995b: 162.
• vastatrix. Crematogaster treubi var. vastatrix Forel, 1911a: 24 (w.q.) INDONESIA (Java).
  • Type-material: lectotype worker (by designation of Hosoishi & Ogata, 2012: 25), 7 paralectotype workers.
  • [Note: original syntype queen is not mentioned by Hosoishi & Ogata, 2012: 25.]
  • Type-locality: lectotype Indonesia: Java (Roepke); paralectotypes with same data.
  • Type-depositories: MHNG (lectotype); MHNG, NHMB (paralectotypes).
  • Combination in C. (Orthocrema): Emery, 1922e: 132;
  • combination in C. (Acrocoelia): Santschi, 1928b: 34.
  • Subspecies of treubi: Forel, 1912n: 57; Emery, 1922e: 132; Menozzi, 1935a: 113 (in key); Chapman & Capco, 1951: 99; Bolton, 1995b: 165.
  • Junior synonym of treubi: Hosoishi & Ogata, 2012: 25.

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 (2012) - HW 0.51-0.74; HL 0.52-0.71; CI 94-104; SL 0.34-0.51; SI 65-74; EL 0.1-0.15; PW 0.28-0.44; WL 0.57-0.81; PSL 0.04-0.1; PtL 0.15-0.22; PtW 0.16-0.22; PtH 0.1-0.14; PpL 0.1-0.15; PpW 0.15-0.19; PtHI 55-78; PtWI 91-111; PpWI 113-150; WI 81-100 (Seventeen workers measured).

Workers monomorphic.

Compound eyes not projecting from lateral margin of head, the outer margin of eye almost flush with head capsule in full face view. Scape not reaching posterior corner of head, the scape with standing setae.

Anterior margin of pronotal collar almost straight or slightly concave in dorsal view. Metanotal groove shallow. Propodeal spines long and slender, their length longer than the diameter of propodeal spiracles. Anterior margin of metapleural gland bulla reaching or exceeding anterior margin of propodeal spiracle. Petiole in dorsal view broader anteriorly than posteriorly. Postpetiole weakly bilobed, without distinct longitudinal median sulcus. Subpetiolar and subpostpetiolar processes undeveloped.

Clypeus relatively smooth and shining, but with feeble rugulae. Dorsal face of mesosoma almost smooth and shining. Dorsolateral face of pronotum smooth in dorsal view. Lateral surface of pronotum smooth and shining. Lateral surface of mesonotum with rugulae. Mesopleuron relatively smooth and shining, but the anterodorsal and lower portions weakly sculptured. Longitudinal rugulae developed anteriorly and posteriorly of the metanotal groove in lateral view.

Dorsal face of head, clypeus and mesosoma with abundant standing setae. Fourth abdominal tergite with sparse standing setae.

Type Material

Hosoishi and Ogata (2012) - LECTOTYPE worker (Museo Civico di Storia Naturale, Genoa worker) (by present designation) and two paralectotype workers from INDONESIA: Java (M. Massart) (Musee d'Histoire Naturelle Genève) [examined].

Crematogaster treubi type material
Lectotype designated by Hosoishi & Ogata, 2012: 25.

Crematogaster millardi type material
Lectotype designated by Hosoishi & Ogata, 2012: 25.

Crematogaster treubi vastatrix type material
Lectotype designated by Hosoishi & Ogata, 2012: 25.

References

• Emery, C. 1896f. Formicides récoltés à Buitenzorg (Java), par M. Massart. Ann. Soc. Entomol. Belg. 40: 245-249 (page 246, worker described)
• Emery, C. 1922c. Hymenoptera. Fam. Formicidae. Subfam. Myrmicinae. [part]. Genera Insectorum 174B: 95-206 (page 132, Combination in C. (Orthocrema))
• Emery, C. 1922c. Hymenoptera. Fam. Formicidae. Subfam. Myrmicinae. [part]. Genera Insectorum 174B: 95-206 (page 132, Senior synonym of sic)
• Heterick, B.E., Kitching, R.L. 2022. The ants (Hymenoptera: Formicidae) of a one-hectare plot of lowland dipterocarp forest. Entomologist’s Monthly Magazine 158(4), 261–272 (doi:10.31184/m00138908.1584.4153).
• Hosoishi, S. & Ogata, K. 2012. Revision of the Crematogaster brevis complex in Asia (Hymenoptera: Formicidae). Zootaxa. 3349:18-30.
• Khachonpisitsak, S., Yamane, S., Sriwichai, P., Jaitrong, W. 2020. An updated checklist of the ants of Thailand (Hymenoptera, Formicidae). ZooKeys 998, 1–182 (doi:10.3897/zookeys.998.54902).
• Kreider, J.J., Chen, T.W., Hartke, T.R., Buchori, D., Hidayat, P., Nazarreta, R., Scheu, S., Drescher, J. 2021. Rainforest conversion to monocultures favors generalist ants with large colonies. Ecosphere 12 (doi:10.1002/ecs2.3717).
• Liu, C., Fischer, G., Hita Garcia, F., Yamane, S., Liu, Q., Peng, Y.Q., Economo, E.P., Guénard, B., Pierce, N.E. 2020. Ants of the Hengduan Mountains: a new altitudinal survey and updated checklist for Yunnan Province highlight an understudied insect biodiversity hotspot. ZooKeys 978, 1–171 (doi:10.3897/zookeys.978.55767).
• Santschi, F. 1937e. Contribution à l'étude des Crematogaster paléarctiques. Mém. Soc. Vaudoise Sci. Nat. 5: 295-317 (page 310, Combination in C. (Mesocrema))
• Wang, W.Y., Soh, E.J.Y., Yong, G.W.J., Wong, M.K.L., Benoit Guénard, Economo, E.P., Yamane, S. 2022. Remarkable diversity in a little red dot: a comprehensive checklist of known ant species in Singapore (Hymenoptera: Formicidae) with notes on ecology and taxonomy. Asian Myrmecology 15: e015006 (doi:10.20362/am.015006).

References based on Global Ant Biodiversity Informatics

• Chapman, J. W., and Capco, S. R. 1951. Check list of the ants (Hymenoptera: Formicidae) of Asia. Monogr. Inst. Sci. Technol. Manila 1: 1-327
• Dias R. K. S. 2002. Current knowledge on ants of Sri Lanka. ANeT Newsletter 4: 17- 21.
• Emery C. 1901. Formiciden von Celebes. Zoologische Jahrbücher. Abteilung für Systematik, Geographie und Biologie der Tiere 14:565-580.
• Emery, C.. "Formiche raccolte da Elio Modigliani in Sumatra, Engano e Mentawei." Annali del Museo Civico di Storia Naturale Giacomo Doria (Genova) (2) 20, no. 40 (1900): 661-722.
• Emery, C.. "Formicides recoltes a Buitenzorg (Java), par M. Massart." Annales de la Société Entomologique de Belgique 40 (1896): 245-249.
• Fontanilla A. M., A. Nakamura, Z. Xu, M. Cao, R. L. Kitching, Y. Tang, and C. J. Burwell. 2019. Taxonomic and functional ant diversity along tropical, subtropical, and subalpine elevational transects in southwest China. Insects 10, 128; doi:10.3390/insects10050128
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• Forel A. 1903. Les Formicides de l'Empire des Indes et de Ceylan. Part X. J. Bombay Nat. Hist. Soc. 14: 679-715.
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• Forel A. 1912. Einige neue und interessante Ameisenformen aus Sumatra etc. Zool. Jahrb. Suppl. 15: 51-78.
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• 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.
• Hosoishi S., K. Ogata. 2012. Revision of the Crematogaster brevis complex in Asia (Hymenoptera: Formicidae). Zootaxa 3349: 18-30.
• Hosoishi, S., and K. Ogata. "Revision of the Crematogaster brevis complex in Asia (Hymenoptera: Formicidae)." Zootaxa 3349 (2012): 18-30.
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