Crematogaster, Lund, 1831

Blaimer, Bonnie B. & Fisher, Brian L., 2013, Taxonomy of the Crematogaster degeeri-species-assemblage in the Malagasy region (Hymenoptera: Formicidae), European Journal of Taxonomy 51, pp. 1-64 : 11

publication ID	https://doi.org/ 10.5852/ejt.2013.51
publication LSID	lsid:zoobank.org:pub:D20CE35E-08CF-41EE-9700-ABDEA6F4413E
DOI	https://doi.org/10.5281/zenodo.3843909
persistent identifier	https://treatment.plazi.org/id/03BEDE7E-FFFA-FF8C-59A9-067CFAD7F9A3
treatment provided by	Carolina
scientific name	Crematogaster
status

Treatment

Key to subgenera and species-groups of Crematogaster View in CoL in the Malagasy region

1. Antennae with 11 segments (including scape)......................................................................................2

– Antennae with 10 segments (including scape)........................................................................................ ......... Crematogaster hova View in CoL -group (former subgenus Decacrema Forel, 1910 ; refer to Blaimer 2010)

2. Petiole ovo-rectangular ( Fig. 3A View Fig ), or rectangular ( Fig. 3B View Fig ), with postero-lateral denticles bearing long erect setae; antennae with a 2-segmented club ( Fig. 3E View Fig ).......................................................................... ..............................................................subgenus Orthocrema Santschi, 1918 (refer to Blaimer 2012b)

– Petiole of different shape, but never rectangular or ovo-rectangular (as e.g. in Fig. 3C, D View Fig ); antennae with a 3-segmented club (as e.g. in Fig. 18A View Fig ), or antennal club indistinct (as in Fig. 3F View Fig )................ 3

3. Median portion of clypeus with a flange (cf) projecting somewhat over mandibles ( Fig. 3G View Fig ); promesonotal suture (pms) present and mesonotum (m) in dorsal view longer than pronotum (p) ( Fig. 3H View Fig ); head round ( Fig. 3F View Fig ); eyes situated distinctly above midline of head in full-face view ( Fig. 3F View Fig )................................. ... Crematogaster ranavalonae View in CoL -group (former subgenus Oxygyne Forel, 1901 ; refer to Blaimer 2012a)

– Median portion of clypeus not protruding as a flange over mandibles ( Fig. 4A View Fig ); promesonotal suture often absent (e.g. as in Figs 7C View Fig ; 12D View Fig ; 15C View Fig ; 18D View Fig ), if present then mesonotum in dorsal view shorter than pronotum; head shape variable, rounded or quadrate (as e.g. in Figs 6A View Fig ; 7A View Fig ; 10A, D View Fig ; 12A View Fig ; 13A View Fig ); position of eyes variable, situated at or above midline of head in full-face view ................... 4

4. Propodeal spines entirely absent (SPI 0.00), at most obtuse tubercules present (as e.g. in Figs 4B View Fig ; 12C View Fig ; 13B View Fig ) .....................................................................................................................................................................5

– Propodeal spines present (SPI> 0.01), from minute dents to distinct spines (as e.g. in Figs 6B View Fig ; 7B View Fig ; 8B View Fig ; 10E View Fig ; 15B View Fig ; 17C View Fig ; 18C View Fig ; 19C View Fig ; 20B View Fig ; 22B View Fig ) ........................................................................................ 6

5. Mesonotum (m) greatly raised with respect to pronotum and propodeum ( Fig. 4B View Fig ); eyes larger (OI> 0.21); medium to small size (HW 0.66 - 1.03, WL 0.62 - 0.98); color orange or brown..................... .............................................................. C. tsisitsilo Blaimer, 2013 (refer to Blaimer & Fisher 2013)

– Promesonotum not much raised with respect to propodeum (as e.g. in Figs 12C View Fig , 13B View Fig ); eyes small (OI <0.21) (as e.g. Figs 12A View Fig , 13A View Fig ); medium to very large size (HW 0.80 - 1.43, WL 0.86 - 1.48); color brown or black ............................ C. degeeri View in CoL -species-assemblage (refer to species key in this study)

6. In lateral view promesonotum forming a straight (or at most slightly rounded) plane ( Fig. 4D View Fig ); posterior face of mesonotum (pfm) long, distinctly set off from dorsal face ( Fig. 4C View Fig ), abruptly and steeply sloping into metanotal groove ( Fig. 4D View Fig ); propodeal spines always spiniform, very short to medium-sized (SPI 0.07 - 0.24), situated high on propodeum (pd) ( Fig. 4D View Fig ).......... C. kelleri View in CoL -group (refer to Blaimer & Fisher 2013)

– Promesonotum variable, but never fitting above description; propodeal spines variable, minute denticles to distinct spines (SPI 0.01 - 0.26), usually situated lower on propodeum (as in Figs 6B View Fig ; 7B View Fig ; 8B View Fig ; 10B, E View Fig ; 15B View Fig ; 17C View Fig ; 18C View Fig ; 19C View Fig ) ................. C. degeeri View in CoL -species-assemblage (refer to species key in this study)