Crematogaster degeeri, Forel, 1886

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 : 11-13

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.3843911
persistent identifier	https://treatment.plazi.org/id/03BEDE7E-FFFA-FF8A-59A9-01FAFAD7F829
treatment provided by	Carolina
scientific name	Crematogaster degeeri
status

Treatment

Key to the workers of the C. degeeri View in CoL -species-assemblage in the Malagasy region

1. Propodeal spines absent, reduced to small tubercules or denticles (as in Figs 10E View Fig ; 12C View Fig ; 13B View Fig ; 18C View Fig ; 20B View Fig ), or short triangular spines (as in Fig. 17C View Fig ) with SPI <0.07; if very rarely propodeal spines spiniform and longer (SPI 0.08 - 0.10) (as in Fig. 6B View Fig ), then small species (HW 0.72 - 0.88, WL 0.79 - 0.91), color dirty-yellow, montane rainforest habitats....................................................................... 2

– Propodeal spines longer, distinctly spiniform (as in Figs 7B View Fig ; 8B View Fig ; 10B View Fig ; 15B View Fig ; 22B View Fig ) and SPI> 0.07; size and color variable; all habitats.................................................................................................... 9

2. Eyes small (OI <0.21) and largely confluent with lateral head margin (as in Fig. 12A View Fig ; 13A View Fig ; 18A View Fig ) .... 3

– Eyes larger (OI> 0.20) and distinctly protruding from lateral head margin (as in Figs 6A View Fig ; 17A View Fig ; 20A View Fig )......6

3. Pronotum dorsally with a distinct median longitudinal groove ( Fig. 4E View Fig ), medium to large species (HW 0.98 - 1.43, WL 0.98 - 1.48) .............................................................................. C. mafybe sp. nov.

– Pronotum dorsally without median longitudinal groove (as e.g. Figs 4F View Fig ; 18D View Fig ), size variable ........ 4

4. Propodeum with spines absent or at most small tubercules (SPI 0.00) ........... C. lobata Emery, 1895 View in CoL

– Propodeum with short triangular spines or sharp minute denticles................................................... 5

5. Antennal scapes very short (SI 0.67 - 0.75), not reaching head margin (as in Fig. 18A View Fig ); mesonotum usually with posterolateral denticles (as in Fig. 18C View Fig )......................................... C. masokely sp. nov.

– Antennal scapes variable, but usually longer (SI 0.69 - 0.82) and about reaching head margin (as in Fig. 10A, D View Fig ); mesonotum usually without posterolateral denticles (as in Fig. 10B, E View Fig )...................... ...................................................................................... C. dentata Dalla Torre, 1893 stat. nov. [part]

6. Eyes very large (OI 0.24 - 0.29), situated above midline of head in full-face view (as in Fig. 20A View Fig ); antennal scapes mostly longer (SI 0.77 - 0.87), reaching or surpassing head margin; bicolored: head and thorax yellowish to dark orange, metasoma with A4-7 brown or black (as in Fig. 20B, C View Fig ) ..................................................................................................................... C. sewellii Forel, 1891 View in CoL

– Eyes mostly smaller (OI 0.20 - 0.26), usually situated at midline of head in full-face view (as e.g. Figs 6A View Fig ; 10A, D View Fig ; 17A View Fig ); antennal scapes variable, but often shorter (SI 0.69 - 0.83), just about or not reaching head margin (as e.g. Figs 6A View Fig ; 10A, D View Fig ; 17A View Fig ); color variable .............................................. 7

7. Propodeum usually distinctly set off from promesonotum in lateral view ( Figs 6B View Fig ; 17C View Fig ) and often with posterolateral denticles; promesonotum with sparse erect pilosity (<8 setae); petiole often much wider than long (PTWI 1.18 - 1.52), and strongly flared (as in e.g. Fig. 3C View Fig )............................ 8

– Propodeum not distinctly set off from promesonotum (in lateral view) ( Fig. 10B, E View Fig ), never with distinct posterolateral denticles; promesonotum usually with abundant erect pilosity (>8 setae); petiole not much wider than long (PTWI 0.95 - 1.31), moderately flared ( Fig. 3D View Fig )............................. ...................................................................................... C. dentata Dalla Torre, 1893 stat. nov. [part]

8. Medium-sized species (HW 0.86 - 1.03, WL 0.92 - 1.08); propodeal spines short and triangular (SPI 0.03 - 0.07); pronotum with sharp lateral margins ( Fig. 5A View Fig )................................ C. malahelo sp. nov.

– Small species (HW 0.72 - 0.88, WL 0.79 - 0.91); propodeal spines longer (SPI 0.06 - 0.10); pronotum lacking sharp lateral margins ( Fig. 5B View Fig ) ................................................................. C. alafara sp. nov.

9. Body color dirty to bright yellow (as in Fig. 7B View Fig , 15B View Fig ).................................................................... 10

– Predominant color either orange (as in Fig. 20B View Fig ), brown (e.g. as in Fig. 19C View Fig ) or black (e.g. as in Fig. 8B View Fig ) ....................................................................................................................................................11

10. Medium to large species (HW 0.87 - 1.03, WL 0.98 - 1.22); antennal scapes very long (SI 0.91 - 1.01), easily surpassing head margin (as in Fig. 7A View Fig ) ............................................................ C. bara sp. nov.

– Small species (HW 0.60 - 0.86, WL 0.66 - 0.93); antennal scapes short (SI 0.71 - 0.83), not or about reaching head margin (as in Fig. 15A View Fig ) .................................................................... C. maina sp. nov.

11. Head distinctly broader than long (CI 1.10 - 1.19) (as in Fig. 22A View Fig ); propodeal spines longer (SPI 0.10 - 0.26); tricolored: orange-red, yellow and black (as in Fig. 22C View Fig ) C. tricolor Gerstäcker, 1859 stat. rev.

– Head not much broader than long (CI 1.01 - 1.13); propodeal spines shorter (SPI <0.16); (as e.g. Figs 8A View Fig ; 10A, D View Fig ; 19A View Fig ); uniformly colored or bicolored......................................................................... 12

12. Mesonotum often with posterolateral denticles ( Fig. 5C View Fig ); in lateral view distinctly set off from propodeum ( Fig. 5C View Fig ); eyes large (OI 0.22 - 0.26); propodeal spines longer (SPI 0.10 - 0.16); erect pilosity on promesonotum often sparse (<8 long erect setae) (as e.g. Figs 5C View Fig ; 8B View Fig ) ........ C. degeeri Forel, 1886 View in CoL

– Mesonotum variable, but more often without posterolateral denticles, and thus in lateral view not as distinctly set off from promesonotum ( Fig. 5D View Fig ); erect pilosity usually more abundant (> 8 long erect setae) (as in Fig. 5D, E View Fig ); propodeal spines shorter (SPI <0.12) ..................................................... 13

13. Propodeum with a distinct short dorsal face, and with a transverse impression ( Fig. 5E View Fig ); sculpture on pronotum carinulate or reticulate ( Fig. 5E View Fig ); petiole oval, fairly slender; (PTWI 0.95 - 1.14); propodeal spines longer (SPI 0.07 - 0.12) ............................................................................... C. ramamy sp. nov.

– Propodeum usually without a distinct dorsal face, never with transverse impression ( Fig. 5F View Fig ); sculpture on propodeum rugulose or aciculate ( Fig. 5F View Fig ); petiole variable, but often wider (PTWI 0.95 - 1.31); propodeal spines usually shorter (SPI 0.01 - 0.10) ........... C. dentata Dalla Torre, 1893 stat. nov. [part]

Key to the queens of the C. degeeri -species-assemblage in the Malagasy region

1. Small queens (HW <1.30, WL <2.20) ............................................................................................. 2

– Large queens (HW> 1.30, WL> 2.20) ............................................................................................. 5

2. Head shape variable, but usually elongate, appearing longer than wide (CI 0.94 - 1.03) (as in Figs 6F View Fig ; 11A View Fig ; 16A View Fig ); eyes smaller (OI <0.32), situated below midline of head in full-face view (as in Figs 6F View Fig ; 11A View Fig ; 16A View Fig ); antennal scapes shorter, often not surpassing level of lateral ocelli (SI <0.67).............. 3

– Head shape square, appearing as wide as long (CI 1.06); eyes larger (OI> 0.33), situated at midline of head in full-face view (as in Fig. 20D View Fig ); antennal scapes longer, surpassing level of lateral ocelli (SI> 0.68) (as in Fig. 20D View Fig ); ............................................................................ C. sewellii Forel, 1891 View in CoL

3. Body color brown .............................................................................................................................. 4

– Body color yellow.................................................................................................... C. maina sp. nov.

4. Very small species (HW 1.01, WL 1.68); head sculpture finely reticulate; ocelli small and protruding very little from head surface (as in Fig. 6F View Fig ) .......................................................... C. alafara sp. nov.

– Larger species (HW 1.13 - 1.41, WL 1.73 - 2.43); head sculpture aciculate-shiny; ocelli distinctly protruding from head surface (as in Fig. 11A View Fig ) ............. C. dentata Dalla Torre, 1893 stat. nov. [part]

5. Antennal scapes long, surpassing lateral ocelli easily and almost reaching head margin (SI> 0.76) (as in Fig. 7F View Fig ); body color yellow .............................................................................. C. bara sp. nov.

– Antennal scapes shorter (SI <0.74) (as in Figs 8D View Fig ; 13D View Fig ; 22D View Fig ); body color other than yellow ....... 6

6. Eyes small (OI 0.23 - 0.26); antennal scapes very short (SI 0.57 - 0.59) (as in Fig. 13D View Fig ); large queens (HW 1.70 - 2.18, WL 2.56 - 3.44); color black .......................................................... C. mafybe sp. nov.

– Eyes usually larger (OI 0.25 - 0.33) (as in Figs 8D View Fig ; 22D View Fig ); antennal scapes mostly longer (SI 0.57 - 0.74) (as in Figs 8D View Fig , 22D View Fig ); usually smaller queens (HW 1.30 - 1.77, WL 2.20 - 2.69); color variable, usually not black................................................................................................................................ 7

7. Head distinctly wider than long (CI 1.14 - 1.21) (as in Fig. 22D View Fig ); tricolored: reddish-orange, yellow and black (as worker in Fig. 22C View Fig ); or at least abdominal segment 4 dorsally with a yellowish patch (as in Fig. 22F View Fig ).......................................................................... C. tricolor Gerstäcker, 1859 stat. rev.

– Head shape variable, but usually not much wider than long (CI <1.10) (as in Fig. 8D View Fig ); uniformly colored ............................................................................................................................................... 8

8. Eyes situated at about midline of head in full-face view (as in Fig. 8D View Fig ); antennal scapes longer (SI 0.68 - 0.72), surpassing level of lateral ocelli.................................................... C. degeeri Forel, 1886 View in CoL

– Eyes situated below midline of head in full-face view (as in Fig. 11A View Fig ); antennal scapes shorter (SI 0.57 - 0.67), not surpassing level of lateral ocelli.......................... C. dentata Dalla Torre, 1893 [part]