Key to Crematogaster of Costa Rica

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This worker key is based on: Longino, J.T. 2003a. The Crematogaster of Costa Rica. Zootaxa 151: 1-150. PDF

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1

Longino 2003 Crematogaster fig4.jpg
Longino 2003 Crematogaster.jpg
  • Face appearing somewhat bare, with dilute appressed pubescence, and usually six or fewer erect setae (Fig. 4); if more (up to 20), workers strongly polymorphic and propodeal spiracle very large (Fig. 7A, stollii); antennal scapes, when laid back, fail to reach posterior margin or only slightly surpass posterior margin; petiole in dorsal view only slightly longer than wide to distinctly wider than long (PTWI > 83), sides convex or straight and parallel, never long and gradually converging anteriorly . . . . . 2
  • Face with abundant erect to suberect pilosity; in some cases setae may be somewhat thickened, relatively short, and curved, but still with a relatively uniform vestiture of standing pilosity (Fig. 4); no underlying short appressed pubescence; scape length variable; petiole in dorsal view variable, subquadrate to elongate, with sides straight and subparallel to converging anteriorly, never with strongly convex sides . . . . . 9

2

return to couplet #1

  • Postpetiole distinctly bilobed, much broader than long in dorsal view (PPI > 150), with broad median longitudinal sulcus; head somewhat elongate (CI 100-103); scapes when laid back just reach or slightly surpass posterior margin of head; face completely devoid of erect setae . . . . . Crematogaster distans
Crematogaster distans casent0103431 head 1.jpg
Crematogaster distans casent0103431 profile 1.jpg
  • Postpetiole subcircular or subquadrate, not broadly bilobed (PPI < 150), median sulcus absent or weakly impressed; head of larger workers distinctly wider than long (CI > 107); scapes variable; face usually with at least one pair of erect setae . . . . . 3

3

return to couplet #2

Crematogaster stollii casent0908427 h 1 high.jpg
Crematogaster stollii casent0908427 p 1 high.jpg
  • Propodeal spiracle smaller (Fig. 7B); face usually with 6 or fewer erect setae . . . . . 4

4

return to couplet #3

  • Pilosity on fourth abdominal tergite composed of abundant filiform flexuous setae, a combination of long erect setae and abundant, long, suberect pubescence . . . . . Crematogaster crucis
Crematogaster crucis casent0908397 h 1 high.jpg
Crematogaster crucis casent0908397 p 1 high.jpg
  • Pilosity on fourth abdominal tergite a combination of completely appressed pubescence, and, when present, a variable number of erect setae; erect setae short, weakly to strongly flattened and stiff . . . . . 5

5

return to couplet #4

  • Promesonotum with at least humeral setae long and filiform; dorsal face of propodeum short, not distinctly differentiated from posterior face . . . . . 6
  • Promesonotum with dorsal setae short and stiff; dorsal face of propodeum differentiated or not . . . . . 7

6

return to couplet #5

Crematogaster moelleri casent0908399 h 1 high.jpg
Crematogaster moelleri casent0908399 p 1 high.jpg
  • Only humeral setae long and filiform, other dorsal setae shorter and stiff . . . . . Crematogaster erecta

7

return to couplet #5

  • All except the largest workers (HW > 1mm) without differentiated dorsal and posterior faces of propodeum (Fig. 7C); fourth abdominal tergite completely lacking erect setae; anteroventral petiolar tooth well developed, acute and projecting . . . . . Crematogaster rochai
Crematogaster rochai casent0173946 head 1.jpg
Crematogaster rochai casent0173946 profile 1.jpg
  • All workers, even small ones, usually with short, differentiated dorsal face of propodeum (Fig. 7D); fourth abdominal tergite always with at least a few erect setae; anteroventral petiolar tooth variable . . . . . 8

8

return to couplet #7

  • Anteroventral petiolar tooth relatively well-developed and sharp (Fig. 7E); fourth abdominal tergite with abundant setae that are uniformly distributed . . . . . Crematogaster crinosa
Crematogaster crinosa casent0173935 head 1.jpg
Crematogaster crinosa casent0173935 profile 1.jpg


  • Anteroventral petiolar tooth relatively less well-developed, forming a right or only weakly acute angle rather than a projecting tooth (Fig. 7F); fourth abdominal tergite with moderately abundant setae that are more dense anterolaterally, often leaving a median strip relatively clear of setae . . . . . Crematogaster torosa
Crematogaster torosa casent0102828 head 1.jpg
Crematogaster torosa casent0102828 profile 1.jpg

9

return to couplet #1

  • Petiole in dorsal view elongate and regularly tapering anteriorly; PTWI < 73; postpetiolar node tall, globular, usually about as wide as long, rarely wider (PPI 85-124), with no median sulcus; face with abundant long or medium length erect setae, face setae never short and stubble-like; color brown to black, never yellow or distinctly bicolored; face smooth and shiny, not punctate or striate (limata complex) . . . . . 10
  • Petiole in dorsal view relatively shorter, usually subquadrate to rectangular, not tapering anteriorly (if somewhat tapering anteriorly, color yellow or distinctly bicolored, or face with sparse erect setae and abundant shorter curved setae); PTWI > 67; postpetiole variable in dorsal view; face setae, color, and face sculpture variable . . . . . 17

10

return to couplet #9

  • Propodeal spines very long, directed upward and outward, SPI usually > 34, if in the range 29-33 (small specimens of nigropilosa) then hind tibia with appressed pilosity . . . . . 11
  • Propodeal spines shorter (SPI < 32), if in the range 29-33 (large specimens of limata) then hind tibiae with erect pilosity; propodeal spines usually directed posteriorly . . . . . 12

11

return to couplet #10

Crematogaster longispina casent0193767 h 1 high.jpg
Crematogaster longispina casent0193767 p 1 high.jpg
Crematogaster nigropilosa casent0173945 head 1.jpg
Crematogaster nigropilosa casent0173945 profile 1.jpg

12

return to couplet #10

  • Setae on mesosomal dorsum dark amber; mesosoma highly polished, with sculpture confined to lateral carinae of mesonotum; carinae on dorsal and posterior faces of mesonotum meet at strongly angular to tuberculate juncture; tibiae with a combination of appressed short pilosity and scattered long erect setae . . . . . Crematogaster sotobosque
Crematogaster sotobosque inbiocri001237410 h 1 high.jpg
Crematogaster sotobosque inbiocri001237410 p 1 high.jpg
  • Setae on mesosomal dorsum light amber to whitish; mesosoma less highly polished, with varying degrees of carinulae and rugulae on pronotum and katepisternum; carinae on dorsal and posterior face of mesonotum may meet at angle, but not produced as a tubercle; tibial pilosity variable, but usually comprised of abundant long erect setae . . . . . 13

13

return to couplet #12

  • Hind tibia with abundant medium-length subdecumbent setae, no long erect setae; petiole with angular anteroventral tooth; postpetiole with no ventral tooth . . . . . Crematogaster foliocrypta
Crematogaster foliocrypta inbiocri002280524 h 1 high.jpg
Crematogaster foliocrypta inbiocri002280524 p 1 high.jpg
  • Hind tibia with abundant long erect setae; ventral margins of petiole and postpetiole variable . . . . . 14

14

return to couplet #13

15

return to couplet #14

  • Petiole relatively triangular in lateral view (PTHI >60), usually lacking anteroventral tooth; posterodorsal tubercles distinctly higher than posterodorsal margin of tergite (Fig. 7G) . . . . . Crematogaster tenuicula
Crematogaster tenuicula casent0179465 head 1.jpg
Crematogaster tenuicula casent0179465 profile 1.jpg
  • Petiole relatively elongate (PTHI < 60 in Central America, variable and often higher in South America), with angular to acute anteroventral tooth; posterodorsal border of petiole low, posterodorsal tubercles little higher than posterodorsal margin of tergite (Fig. 7H) . . . . . Crematogaster brasiliensis
Crematogaster brasiliensis casent0627991 h 1 high.jpg
Crematogaster brasiliensis casent0627991 p 1 high.jpg

16

return to couplet #14

Crematogaster carinata casent0908435 h 1 high.jpg
Crematogaster carinata casent0908435 p 1 high.jpg
  • Petiole usually lacking anteroventral tooth; propodeal spines long (SPI > 25) . . . . . Crematogaster limata
Crematogaster limata casent0912774 h 1 high.jpg
Crematogaster limata casent0912774 p 1 high.jpg

17

return to couplet #9

  • Face largely punctate or otherwise heavily sculptured, with smooth and shiny portion restricted to a median strip . . . . . 18
  • Face largely smooth and shining, with at most small areas of punctation between eye and antennal insertion . . . . . 22

18

return to couplet #17

  • Tibiae with abundant erect setae; size relatively large (WL > 0.70) . . . . . 19
  • Tibial pilosity fully appressed, not erect; size relatively smaller (WL < 0.73) . . . . . 21

19

return to couplet #18

  • Dorsal setae on mesosoma and fourth abdominal tergite dark amber; propodeum somewhat inflated; propodeal spines very thin and needle-like (Fig. 7I, J) . . . . . Crematogaster arcuata
Crematogaster arcuata casent0193084 h 1 high.jpg
Crematogaster arcuata casent0193084 p 1 high.jpg
  • Dorsal setae whitish; propodeum less inflated; propodeal spines more broadly tapering to base (Fig. 7K, L, M, N) . . . . . 20

20

return to couplet #19

  • Propodeal spines relatively thinner and less diverging, more posteriorly directed in dorsal view (Fig. 7K,L); dorsal and posterior faces of propodeum not well differentiated, more or less in same plane; anteroventral margin of petiole with a low, rounded tumosity but lacking distinct angle or tooth; anteroventral margin of postpetiole with bluntly rounded projection, lacking sharp tooth . . . . . Crematogaster evallans
Crematogaster evallans casent0628099 h 1 high.jpg
Crematogaster evallans casent0628099 p 1 high.jpg
  • Propodeal spines stout and diverging (Fig. 7M,N); dorsal and posterior faces of propodeum differentiated, not in same plane; anteroventral margin of petiole developed as distinct right to acute angle; anteroventral margin of postpetiole with sharp, acute tooth . . . . . Crematogaster acuta
Crematogaster acuta casent0173927 head 1.jpg
Crematogaster acuta casent0173927 profile 1.jpg

21

return to couplet #18

  • Propodeum somewhat inflated, with propodeal spines reduced to small denticles; anteroventral petiolar tooth lacking . . . . . Crematogaster montezumia
Crematogaster montezumia casent0173939 head 1.jpg
Crematogaster montezumia casent0173939 profile 1.jpg
  • Propodeum not inflated; propodeal spines well-developed; anteroventral petiolar tooth well-developed . . . . . Crematogaster obscurata
Crematogaster obscurata casent0103800 head 1.jpg
Crematogaster obscurata casent0103800 profile 1.jpg

22

return to couplet #17

  • Color amber to dark brown or black, or bicolored with dark head and gaster, lighter mesosoma . . . . . 28

23

return to couplet #22

  • Mid and hind tibiae with one or more very long erect setae, much longer than maximum tibia width . . . . . 24
  • Mid and hind tibiae with appressed to suberect setae, none longer than maximum width of tibia . . . . . 25

24

return to couplet #23

  • Propodeal spines upturned; erect setae on pronotal humeri and posterolateral mesonotum very long, subequal in length, longer than setae on anterolateral mesonotum (Fig. 7O) . . . . . Crematogaster sumichrasti
Crematogaster sumichrasti casent0603544 head 1.jpg
Crematogaster sumichrasti casent0603544 profile 1.jpg
  • Propodeal spines directed posteriorly; erect setae on pronotal humeri and anterolateral mesonotum the longest, longer than setae on posterolateral mesonotum (Fig. 7P) . . . . . Crematogaster flavosensitiva
Crematogaster flavosensitiva jtlc000001380 h 1 high.jpg
Crematogaster flavosensitiva jtlc000001380 p 1 high.jpg

25

return to couplet #23

  • Eyes very small (OI < 23); erect setae on face and mesosomal dorsum relatively short, somewhat stiffened, forming a stubble; propodeal spines short, upturned . . . . . Crematogaster flavomicrops
Crematogaster flavomicrops casent0193764 h 1 high.jpg
Crematogaster flavomicrops casent0193764 p 1 high.jpg
  • Eyes larger (OI > 24), erect setae on face and mesosoma longer and thinner; propodeal spines variable . . . . . 26

26

return to couplet #25

  • Pair of setae on posterolateral mesonotum subequal in length to humeral setae; propodeal spines relatively long, upturned . . . . . Crematogaster monteverdensis
Crematogaster monteverdensis jtlc000001405 h 1 high.jpg
Crematogaster monteverdensis jtlc000001405 p 1 high.jpg
  • Propodeal spines of variable length, upturned or directed posteriorly; humeral setae much longer than any setae on mesonotum . . . . . 27

27

return to couplet #26

  • Propodeal spines short (SPI 15-18); mesosoma relatively compact in lateral profile (Fig. 7Q) . . . . . Crematogaster minutissima
Crematogaster minutissima casent0103789 head 1.jpg
Crematogaster minutissima casent0103789 profile 1.jpg
  • Propodeal spines long (SPI 18-21); mesosoma more elongate in lateral profile (Fig. 7R) . . . . . Crematogaster wardi
Crematogaster wardi inbiocri001238527 h 1 high.jpg
Crematogaster wardi inbiocri001238527 p 1 high.jpg

28

return to couplet #22

29

return to couplet #28

  • Postpetiole much wider than long (PPI > 138); setae on face short, flattened, curved or slanted toward median axis; anteroventral margin of petiole lacking angle or tooth; ventral margin of postpetiole with rounded lobe, without acute tooth . . . . . Crematogaster abstinens
Crematogaster abstinens casent0603551 head 1.jpg
Crematogaster abstinens casent0603551 profile 1.jpg
  • Postpetiole more globular (PPI < 132); setae on face of variable length and stiffness, but not strongly curved or slanting toward median axis; anteroventral margin of petiole with subacute tooth or at least blunt lobe; ventral margin of postpetiole with obtuse to acute tooth . . . . . 30

30

return to couplet #29

Crematogaster bryophilia inbiocri001225726 h 1 high.jpg
Crematogaster bryophilia inbiocri001225726 p 1 high.jpg
  • Propodeal spines in dorsal view with bases thickened, directed outward, tips short,

abruptly narrowed and directed posteriorly (Fig. 7T) . . . . . Crematogaster curvispinosa

Crematogaster curvispinosa casent0173308 head 1.jpg
Crematogaster curvispinosa casent0173308 profile 1.jpg

31

return to couplet #28

  • Propodeal spines forming angular tumosities, not spiniform, or with at most a minute spiniform denticle . . . . . Crematogaster raptor
Crematogaster raptor casent0628116 h 1 high.jpg
Crematogaster raptor casent0628116 p 1 high.jpg

32

return to couplet #31

  • Ventral margin of postpetiole with acute to right angled tooth; propodeal spines relatively long and upturned (SPI 19-23); postpetiole gradually constricted toward helcium; mesosoma often light brown, contrasting with dark brown head and gaster . . . . . Crematogaster snellingi
Crematogaster snellingi jtlc000001420 h 1 high.jpg
Crematogaster snellingi jtlc000001420 p 1 high.jpg
  • Ventral margin of postpetiole flat, completely lacking tooth; propodeal spines relatively short and posteriorly directed (SPI 13-18); postpetiolar node abruptly constricted, with clearly defined juncture with cylindrical stem of helcium; head, mesosoma, and gaster uniformly dark brown . . . . . Crematogaster jardinero
Crematogaster jardinero jtlc000001395 h 1 high.jpg
Crematogaster jardinero jtlc000001395 p 1 high.jpg