Key to Paraparatrechina of the Afrotropical and Malagasy Regions

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This worker key is based on: LaPolla, J.S. & Fisher, B.L. 2014. Two new Paraparatrechina (Hymenoptera, Formicidae) species from the Seychelles, with notes on the hypogaeic weissi species-group. ZooKeys 414, 139–155 (doi: 10.3897/zookeys.414.7542)

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1

  • Eyes small relative to head length (REL ≤ 16) . . . . . 2
  • Eyes medium to large relative to head length (REL ≥ 17) . . . . . 6

2

return to couplet #1

  • Eyes consisting of less than 10 facets; polymorphic, with clearly expressed major caste; Equatorial Africa; weissi species-group . . . . . 3
  • Eyes consisting of more than 10 facets; monomorphic; Madagascar . . . . . 5

3

return to couplet #2

  • Scapes with numerous erect macrosetae; mesosoma with numerous erect macrosetae scattered across each segment (especially abundant on pronotum and mesonotum) . . . . . Paraparatrechina bufona
Paraparatrechina bufona casent0906212 p 1 high.jpg
  • Scapes without erect macrosetae; few macrosetae on mesosoma (typically 2 on prontoum; 1 on mesonotum and 1 on propodeum) . . . . . 4

4

return to couplet #3

  • Metanotal groove strongly impressed; head without paired macrosetae medially from posterior margin towards clypeus; no macrosetae on posterior margin . . . . . Paraparatrechina sordida
Paraparatrechina sordida casent0914143 p 1 high.jpg
  • Metanotal groove not strongly impressed; head with paired macrosetae medially from posterior margin towards clypeus; at least four macrosetae on posterior margin . . . . . Paraparatrechina weissi
Pseudolasius weissi casent0008664 profile 1.jpg

5

return to couplet #2

  • Scape with decumbent pubescence; scapes surpass posterior margin by approximately length of the first 3–4 funicular segments . . . . . Paraparatrechina myops
Paraparatrechina myops casent0042527 profile 1.jpg
  • Scape with appressed pubescence; scapes surpass posterior margin by approximately length of the first 2–3 funicular segments . . . . . Paraparatrechina ocellatula
Paraparatrechina ocellatula casent0416898 p 1 high.jpg

6

return to couplet #1

  • Mesosoma elongate in lateral view, with pronotum gently rising towards mesonotum . . . . . 7
  • Mesosoma compact in lateral view, with pronotum steeply rising towards mesonotum . . . . . 9

7

return to couplet #6

  • Propodeum with a short, angular dorsal face, and a long declivitous face; scape length <0.6 mm; Madagascar . . . . . Paraparatrechina glabra
Paratrechina glabra casent0067057 profile 1.jpg
  • Propodeum with rounded dorsal face, not conspicuously longer than declivitous face; scape length >0.6 mm; Equatorial Africa . . . . . 8

8

return to couplet #7

  • Scape length > 0.72 mm; tibiae same brown color as mesosoma; protrochanter brown as in mesosoma, but meso/metatrochanters may be lighter brown; mandibles and antennae typically same brown color as head . . . . . Paraparatrechina splendida
Paraparatrechina splendida casent0178763 p 1 high.jpg
  • Scape length < 0.72 mm; tibiae whitish to brownish-yellow; all trochanters white; mandibles and antennae yellowish-brown, contrasting with brown head . . . . . Paraparatrechina concinnata
Paraparatrechina concinnata casent0178761 p 1 high.jpg

9

return to couplet #6

  • Mesosomal dorsum (primarily pronotum and mesonotum) much lighter (typically yellow against brown or white against dark brown) than remainder of mesosoma . . . . . 10
  • Mesosomal dorsum not much lighter than remainder of mesosoma . . . . . 11

10

return to couplet #9

  • Dorsum of gaster with a distinctly yellow to white patch of color contrasting with remainder of gaster; Seychelles . . . . . Paraparatrechina luminella
Paraparatrechina luminella casent0134319 p 1 high.jpg
Paraparatrechina albipes casent0178759 profile 1.jpg

11

return to couplet #9

Paraparatrechina umbranatis casent0178764 profile 1.jpg
  • Gaster brownish-yellow to yellow, not conspicuously contrasting with head and mesosoma . . . . . 12

12

return to couplet #11

Paraparatrechina brunnella casent0178757 p 1 high.jpg
  • Yellow species, with antennae and legs same color as remainder of body . . . . . 13

13

return to couplet #12

Paraparatrechina gnoma casent0178758 p 1 high.jpg

14

return to couplet #13

Paraparatrechina oreias casent0178762 p 1 high.jpg

15

return to couplet #14

  • Short, decumbent pubescence covers head, especially lateroposteriorly, where it is longer than remainder of head; pubescence on gaster longer, slightly decumbent, giving an “unkempt” appearance; West Africa . . . . . Paraparatrechina subtilis
Paraparatrechina subtilis casent0178760 profile 1.jpg
  • Short, decumbent pubescence present lateroanteriorly around eyes; pubescence on gaster shorter, tightly appressed to gaster, with pubescence appearing in neat rows with a silky appearance; Seychelles . . . . . Paraparatrechina illusio
Paraparatrechina illusio casent0159099 p 1 high.jpg