Crematogaster treubi Emery

Hosoishi, Shingo & Ogata, Kazuo, 2012, Revision of the Crematogaster brevis complex in Asia (Hymenoptera: Formicidae), Zootaxa 3349, pp. 18-30 : 25

Crematogaster treubi Emery

( Figs 1 a, 3b, 5c, 10)

Crematogaster treubi Emery, 1896: 246 .

LECTOTYPE worker ( MCSN worker) (by present designation) and two paralectotype workers from INDONESIA: Java (M. Massart) ( MHNG) [examined] .

Combination in C. ( Orthocrema ) by Emery, 1922: 132; in C. ( Mesocrema ) by Santschi, 1937: 310. Senior synonym of sic by Emery, 1922: 132.

Crematogaster millardi Forel, 1902: 205 .

LECTOTYPE worker (by present designation) and one paralectotype worker from MYANMAR: Moulmain ( Hodgson ) ( MHNG) [examined].

Description of queen by Viehmeyer, 1916: 125. Combination in C. ( Orthocrema ) by Emery, 1922: 132; in C. ( Mesocrema ) by Santschi, 1928: 33. Syn. nov.

Crematogaster treubi var. vastatrix Forel, 1911a: 24 . LECTOTYPE worker (top specimen of three on one pin, MHNG worker) (by present designation) and seven paralectotype workers from INDONESIA: Java ( Roepke ) ( MHNG, NHMB) [examined] .

Combination in C. ( Orthocrema ) by Emery, 1922: 132; in C. ( Acrocoelia ) by Santschi, 1928: 34. Syn. nov.

Measurements and indices. 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).

General description of worker. 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.

Distribution. This species is widely distributed, occurring in Cambodia, Thailand, Myanmar, Malaysia (Peninsula and Borneo), Brunei, and Indonesia (Kalimantan, Java, Bali, Sunda Strait, Sulawesi).

Remarks. 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.

Specimens examined. CAMBODIA: 5 workers, Rubber Plantation, Kampong Cham, 2. v. 2010 (SH10-Cam-118) (S. Hosoishi) ; 5 workers, Community Forest, Kampong Chnang, 21. iv. 2010 (SH10-Cam-85) (S. Hosoishi) ; 3 workers, Natural Forest (Permanental sample plots), Kampong Thom, 20. xi. 2010 (SH10-Cam-42) (S. Hosoishi) ; 2 workers, Natural Forest, Kampong Thom, 20. xi. 2010 (SH10-Cam-152) (S. Hosoishi) ; THAILAND: 6 workers, Maegar, Phayao, 22. iii. 1990 (no collector’s name) ; 6 workers, Ngao, Lampang, 17. ii. 1991 (no collector’s name) ; 11 workers, Maegar Seed Orch., Phayao, Lampang Province, 16. iii. 1991 (T. Goto) ; 6 workers, Maeklong Watershed, Research Station, Kanchanaburi Prov., W. Thailand, 29. xi. 2003 (TH03-SKY-146) (Sk. Yamane) ; 4 workers, Khao Soi Dao W. S., Chanthaburi Prov., E. Thailand, 19. vii. 1997 (Sk. Yamane) ; MALAYSIA: 12 workers, 7 miles, Cameron Highlands, 9. iii. 2005 (2005c3) (S. Hosoishi) ; 3 workers, 7 miles, Cameron Highlands, 12. iii. 2005 (2005c24) (S. Hosoishi) ; 14 workers, Ulu Gombak, Selangor, 28. xi. 2005 (SH05-Mal-10) (S. Hosoishi) ; 8 workers, Ulu Gombak, Selangor, 7. iii. 2009 (SH05-Mal-29) (S. Hosoishi) ; 5 workers, 7 miles, Cameron Highlands, 9. iii. 2010 (SH10-Mal-15) (S. Hosoishi) ; 4 workers, 7 miles, Cameron Highlands, 9. iii. 2010 (SH10-Mal-01) (S. Hosoishi) ; 4 workers, 7 miles, Cameron Highlands, 9. iii. 2010 (SH10-Mal-02) (S. Hosoishi) ; 7 workers, Malaya Univ., Selangor, 4. iii. 2009 (SH09-Mal-08) (S. Hosoishi) ; 6 workers, Malaya Univ., Selangor, 4. iii. 2009 (SH09-Mal-05) (S. Hosoishi) ; 6 workers, Malaya Univ., Selangor, 4. iii. 2009 (SH09-Mal-06) (S. Hosoishi) ; 4 workers, Sepilok, Sandakan, Sabah, 17. viii. 1981 (K. Masuko) ; 1 worker, Kota Kinabalu, Sabah, Borneo, E. Malaysia, 22. vii. 1996 (K. Eguchi) ; 2 workers, Tower Region, Lambir N. P., Miri, Sarawak (T-1-9) 30. i. 1993 (Canopy Ecology) (Sk. Yamane) ; 6 workers, Poring HQ (ca 600m alt), Sabah, Borneo, E. Malaysia, 10. iii. 2008 (tree decayed part) (SB08-SKY-01) (Sk. Yamane) ; 1 worker, P. Manukan, T. Tunku Abd., Rahman, Sabah, Borneo, 21. iii. 1995 (Sk. Yamane) ; 1 worker, Poring, Kinabalu (nr HQ, 550m alt), Sabah, Borneo, E. Malaysia, 16. iii. 1995 (Sk. Yamane) ; 2 workers, Pulau Sapi, T. Tunku Abd., Rahman, Sabah, Borneo, 12. iii. 1995 (Sk. Yamane) ; SINGAPORE: 4 workers, 4. xii. 1995 (Sk. Yamane) ; BRUNEI: 2 workers, Tasek Merimbun, 11. ii. 1999 (Eg09-BOR-010) (K. Eguchi) ; INDONESIA: 2 workers, Teluk Kabah, Kutai N. P., E. Kalimantan, 17. ix. 1993 (Sk. Yamane) ; 1 worker, Kutai National Park (near Km9), E. Kalimantan, 7. viii. 1992 (Sk. Yamane) ; 1 worker, Sangkimah, Kutai National Park, E. Kalimantan, 11. ix. 1993 (Canopy Ecology) (Sk. Yamane) ; 1 worker, Samarinda, E. Kalimantan, 9-12. viii. 1992 (Sk. Yamane) ; 2 workers, Jasinga, nr Bogor, W. Java, 5. xi. 1985 (Sk. Yamane) ; 2 workers, Campus of Gajah Mada Univ. (100m alt), Yogyakarta, C. Java, 29. xii. 2002 (JV02/03-SKY-31) (Sk. Yamane) ; 7 workers, Pesanggaran (0 m), Bali, 5. x. 2000 (K. Ogata) ; 7 workers, Pesanggaran (0 m), Bali, 5. x. 2000 (J. Abe) ; 3 workers, Pesanggaran (0 m), Bali, 5. x. 2000 (H. Simbolon) ; 2 workers, Pulau Sebesi, Lampung Prov., Sunda Strait, 11. viii. 2005 (RK05-SKY-01) (Sk. Yamane) ; 4 workers, Pulau Sebesi, Lampung Prov., Sunda Strait, 14. viii. 2005 (RK05- SKY-56) (Sk. Yamane) ; 6 workers, Gn. Makaroewa (550m alt), Kab. Maros, S. Sulawesi, 24. i. 2010 (CE10-SKY-34) (Sk. Yamane) ; 2 workers, Benteng, Pulau Togian, Sulawesi, 25. viii. 2008 (Sk. Yamane).

Figures

FIGURES 1 – 3. 1. Full face view of head. 1 a, Crematogaster treubi; 1 b, C. (Orthocrema) longipilosa. Arrow indicates anterolateral margin of clypeus. Scale bars are all 0.5 mm. 2. Occipital carina in posterior view. 2 a, Crematogaster overbecki; 2 b, C. bouvardi. Arrow indicates occipital carina. Scale bars are all 0.5 mm. 3. Petiole and postpetiole in dorsal view. 3 a, Crematogaster brevis; 3 b, C. treubi; 3 c, C. walshi. Scale bars are all 0.5 mm.