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Key to Simopelta species
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1
- Mandible with 6 or more teeth (Figure 4); bright ferruginous red, appendages, petiole, and gaster yellow; Brasil (Espírito Santo) . . . . . Simopelta bicolor
- Mandible with 3 - 5 teeth (Figure 5 and 6); usually dark, nearly black; widely distributed . . . . . 2
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- Mandible with 5 teeth (Figure 5), two apicalmost teeth well developed, remaining 3 teeth smaller (some may be broken or missing); Costa Rica . . . . . Simopelta pentadentata
- Mandible with 3 or 4 teeth (Figure 6), all approximately equal in size, if additional tooth is present, it is much smaller than others; widely distributed . . . . . 3
3
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- Mandible with 3 teeth, approximately equal sized (Figure 6, left); relatively common . . . . . 4
- Mandible with 4 teeth, approximately equal sized (Figure 6, right); rarely collected . . . . . 17
4
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- Pronotum mostly smooth and shining, as are large part of anterior dorsum of head and various other parts of mesosoma (Figure 7); background may be punctated (Figure 8) or otherwise sculptured; black . . . . . 5
- Head and mesosoma, including pronotum, mostly roughly sculptured and more or less opaque (Figure 9); usually dark reddish-brown . . . . . 6
5
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- At least posterior 1/4 of head punctated, pronotum with weak punctures; northern Ecuador . . . . . Simopelta manni
- Head glossy and shiny from frontal lobes to posterior border of head (Figure 8); pronotum glossy; Colombia . . . . . Simopelta laevigata
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- Eye (single ommatidium, maximum diameter ~ 0.1 mm) relatively large and conspicuous (Figure 9), greatest diameter greater than or equal to antennomere 4; dark brown; head densely and evenly punctate; dorsum of postpetiole (first segment of gaster) smooth and glossy; Costa Rica . . . . . Simopelta oculata
- Eyes smaller (Figure 10), greatest diameter (usually less than 0.08 mm) distinctly less than greatest width of antennomere 4, if eyes larger, dorsum of postpetiole punctate, or head with transverse costulae or granulated . . . . . 7
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- Posterior part of head, front of pronotum, mesonotum and propodeum more or less distinctly transversely striate or rugulose (Figure 5); median clypeal lobe without slender tooth or process (Figure 10); blackish brown . . . . . 8
- Head and mesosoma as seen from above uniformly and densely punctate or granulose, if striae are present, they are mostly longitudinal; tooth or process may be present on clypeus; color varies but often reddish . . . . . 14
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- Suberect hairs on outer surface of posterior tibia (Figure 11) of two distinct lengths: shorter hairs 0,07 mm, longer hairs 0.13 mm; petiolar node wider than long (seen from above - Figure 13); western Colombia . . . . . Simopelta transversa
- Suberect hairs on outer surface of tibia (Figure 12) all approximately same length (usually shorter than 0.07 mm), or absent . . . . . 9
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- Third tooth (basalmost) nearly always bluntly truncated (Figure 10); petiolar node usually square-shaped or circular (as seen from above); mesonotum approximately as long as dorsal face of propodeum (Figure 7) . . . . . 10
- Third tooth (basalmost tooth) nearly always sharply pointed (Figure 14); petiolar node usually longer than broad (Figure 17) and narrowed anteriorly (seen from above); mesonotum shorter than propodeum (as seen from side - Figure 17) . . . . . 12
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- Clypeal lobe elongated, projecting above clypeal apron (Figure 14); extreme southwestern Colombia and north central Ecuador . . . . . Simopelta longirostris
- Clypeal lobe not elongated, rounded or slightly angulate (Figure 15), not greatly extending over clypeal apron . . . . . 11
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- Side and top (Figure 13) of petiolar node with distinct striae or rugulae; Costa Rica south to Ecuador . . . . . Simopelta williamsi
- Side and top (Figure 13) of petiolar node nearly smooth and glossy; Colombia and Ecuador . . . . . Simopelta vieirai
12
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- Antennal scape elongate (Figure 15), extending about 0.25 mm (more than length of first 2 funicular segments) past posterior lateral corner; southern Colombia . . . . . Simopelta fernandezi
- Antennal scape less elongate (Figure 16), extending about 0.12 mm past posterior lateral corner (less than length of first funicular segment); Costa Rica and Panamá . . . . . 13
13
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- Node of petiole (seen from above) approximately as long as broad (Figure 13); lower third of pronotum and mesopleuron sculptured and moderately shining; dorsal surface of propodeum covered with transverse or longitudinal striolae; top of petiolar node coarsely sculptured; Panamá . . . . . Simopelta breviscapa
- Node of petiole much longer than broad (Figure 17); lower third of pronotum and mesopleuron polished and shiny; dorsal surface of propodeum granulated; dorsum of petiole nearly smooth and glossy (Figure 17); Costa Rica . . . . . Simopelta longinoda
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- Larger species (head width usually > 0.66 mm, total length > 4 mm); punctures of head, mesosoma and node of petiole coarse, separate punctures of head larger than eye (Figure 18); color ferruginous red to black, with contrasting yellow, red or brown gaster and appendages; anterior medial clypeal margin with sharp tooth; Ecuador (Orellana); Brasil (Rondônia) . . . . . Simopelta jeckylli
- Usually smaller species (head width often < 0.66 mm; total length usually less than 4 mm); punctuation fine and shallow, separate punctures of head about 1/3 size of eye (Figure 19), or head granulose, or with predominantly longitudinal striae; color yellowish-brown to dark brown; clypeus with or without tooth; Central America south to Brasil . . . . . 15
15
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- Yellowish to reddish brown; head finely punctate; petiole narrow as seen from side (Figure 20); dorsum of postpetiole (first tergum of gaster) with tiny, sparse punctures . . . . . 16
- Dark reddish black; head granulose, or with poorly defined, longitudinal striae or rugae; petiole thick as seen from side (Figure 21); Dorsum of postpetiole (first gastral tergite) punctate (Figure 21); Costa Rica and Panamá . . . . . Simopelta paeminosa
16
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- Small (total length less than 2.5 mm); head elongate (0.73 ≥ HW/HL ≥ 0.78); dorsal surface of mandibles smooth and glossy; Bahia, Brasi . . . . . Simopelta minima
- Larger (TL > 3 mm); head less elongate (HW/HL > 0.8, excluding spine); dorsal surface of mandibles dull, covered with striolae; Guatemala south to Venezuela (Tachira) and Colombia (Magdalena) . . . . . Simopelta pergandei
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- Clypeus with well developed medial tooth (Figure 24); Perú and Brasil . . . . . 18
- Clypeus without medial tooth, broadly rounded anteriorly (Figure 26); Costa Rica (Puntarenas) . . . . . 20
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- Posterior margin of head distinctly concave in middle, as seen in full-face view (Figure 23); southwestern Colombia and northern Perú . . . . . Simopelta laticeps
- Posterior margin of head nearly straight, as seen in full-face view (Figure 25); Colombia (Nariño), southern Brasil (Mato Grosso, Santa Catarina) . . . . . 19
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- Larger (Total length 5 mm); posterior dorsal region of head with distinct, transverse striolae; southern Colombia (Nariño) . . . . . Simopelta mayri
- Smaller (TL < 3.5 mm); posterior dorsal region of head punctate, without evidence of striolae; southern Brasil (Mato Grosso, Santa Catarina) . . . . . Simopelta curvata
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- Eye (Figure 25) relatively large (maximum diameter ≥ 0.1 mm); hairs on scape slightly elevated from surface . . . . . Simopelta andersoni
- Eye (Figure 26) smaller (< 0.07 mm); hairs on scape appressed to surface . . . . . Simopelta quadridentata