Key to Pheidole lutea species group

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This worker key is based on: Salata, S. and B.L. Fisher. 2020a. Pheidole Westwood, 1839 (Hymenoptera, Formicidae) of Madagascar – an introduction and a taxonomic revision of eleven species groups. ZooKeys. 905:1–235. doi:10.3897/zookeys.905.39592

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Salata and Fisher 2020a. Figure 13. Pheidole lutea, head of major worker (A), profile of major worker (F) and minor worker (D), and hypostomal teeth (I). Pheidole ranohirensis, head of major worker (B), profile of major worker (G) and minor worker (E), and hypostomal teeth (J). Pheidole voasara, head of major worker (C), profile of major worker (H), and hypostomal teeth (K).
Salata and Fisher 2020a. Figure 14. Pheidole navoatrensis, profile of major worker (A), minor worker (G) and hypostomal teeth (D). Pheidole typchlos, head of major worker (K), profile of major worker (C), minor worker (I) and hypostomal teeth (F). Pheidole parviocula, head of major worker (J), profile of major worker (B), minor worker (H) and hypostomal teeth (E).
  • Major workers. Head, in full-face view, elongate; occipital lobes smooth (Fig. 13), sometimes with indistinct, very sparse, longitudinal to irregular rugoreticulate; genae smooth. Minor workers. Head vertex smooth and never with few arcuate, interrupted rugae; scape, when laid back, reaching posterior head margin (Fig. 13) . . . . . 2
  • Major workers. Head, in full-face view, oval; occipital lobes and genae with thick, sparse, irregular rugae, interspaces with indistinct foveolae (Fig. 14). Minor workers. Vertex smooth and with few arcuate, interrupted rugae; scape, when laid back, surpassing the posterior head margin by one-fifth of its length (Fig. 14) . . . . . 3

2

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  • Major workers. Genae and antennal scrobes never foveolate, outer hypostomal teeth approximately as high as inner hypostomal teeth, with very wide base and upper half thin, rectangular, and pointed outward, anepisternum, katepisternum, and mesosoma smooth (Fig. 13A, F, I). Minor workers. Promesonotum in later view evenly arched, high, and short (Fig. 13D) . . . . . Pheidole lutea
Major worker.
Major worker.
  • Major workers. Genae and antennal scrobes foveolate, outer hypostomal teeth dentate, smaller and thinner than inner hypostomal teeth and never pointed outward; anepisternum, katepisternum, and mesosoma never entirely smooth (Fig. 13B, G, J). Minor workers. Promesonotum in later view low, short, slightly convex, and with relatively steep posterior declivity (Fig. 13E) . . . . . Pheidole ranohirensis
Major worker.
Major worker.

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  • Major workers. Eyes well-developed (EL > 0.1), posterior mesonotum never concave, outer hypostomal teeth weakly developed (Fig. 14A, D). Minor workers. Eyes well developed (EL > 0.07), promesonotum convex, and propodeal spines small, triangular (Fig. 14G) . . . . . Pheidole navoatrensis     although if the outer hypostomal teeth are lobe-like, bigger and wider than inner hypostomal teeth (Fig. 13K) then see a diagnosis of Pheidole voasara of which minor workers are unknown.
Major worker.
Major worker.
  • Major workers. Eyes small and reduced (EL < 0.1), posterior mesonotum concave, outer hypostomal teeth well developed (Fig. 14B, C, E, F). Minor workers. Eyes small and reduced (EL < 0.06), promesonotum box-like, if convex then propodeal spines indistinct (Fig. 14H, I) . . . . . 4

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  • Major workers. Sides of head with sparse and short pilosity, inner hypostomal teeth distinct, triangular, propodeal spines short and triangular (Fig. 14C, F, K). Minor workers. Promesonotum box-like, propodeal spines distinct, short and triangular (Fig. 14I) . . . . . Pheidole typhlos
Major worker.
Major worker.
  • Major workers. Sides of head with dense and relatively long pilosity, inner hypostomal teeth indistinct, lobe-like, propodeal spines absent or weakly developed (Fig. 14B, E, J). Minor workers. Promesonotum convex, propodeal spines weakly developed, indistinct (Fig. 1H) . . . . . Pheidole parviocula
Major worker.
Major worker.