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Key to Nearctic Nylanderia Males
This key to males is based on: Kallal, R.J. & LaPolla, J.S. 2012. Monograph of Nylanderia (Hymenoptera: Formicidae) of the World, Part II: Nylanderia in the Nearctic. Zootaxa 3508, 1-64.
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1
- Gaster elongate and cylindrical . . . . . 2
- Gaster not elongate or cylindrical . . . . . 3
2
return to couplet #1
- Parameres long and digitiform; digiti without extra structures or projections . . . . . Nylanderia bruesii
- Parameres triangular with tapered apices; digiti with unique dorsal projections at approximately midlength . . . . . Nylanderia magnella
3
return to couplet #1
- Digiti and cuspides elongate . . . . . 4
- Digiti and cuspides not elongate . . . . . 5
4
return to couplet #3
- Overall dark brown in color; scapes with no more than 5 macrosetae (typically scapes with 1–2 macrosetae); digiti and cuspi-des relatively straight; cuspides nearly as long as digiti . . . . . Nylanderia arenivaga
 Head of Nylanderia arenivaga male |
 Profile of Nylanderia arenivaga male |
- Overall light brown in color; scapes completely lacking macrosetae; digiti curved outward from aedeagal valves, cuspides curved inward toward aedeagal valves; cuspides shorter than digiti . . . . . Nylanderia phantasma
 Head of Nylanderia phantasma male |
 Profile of Nylanderia phantasma male |
5
return to couplet #3
- Parameres subquadrate with a dorsal notch . . . . . Nylanderia bourbonica
 Head of Nylanderia bourbonica male |
 Profile of Nylanderia bourbonica male |
- Parameres triangular without a dorsal notch . . . . . 6
6
return to couplet #5
- Scapes with 0–2 macrosetae; if with 2 macrosetae, then scape length less than 0.55 mm. . . . . . 7
- Scapes with 2 or more macrosetae; if with 2 macrosetae, then scape length greater than 0.55 mm . . . . . 9
7
return to couplet #6
- Scapes with 1–2 macrosetae; 9th sternite 0.15 mm wide or less . . . . . Nylanderia wojciki
 Head of Nylanderia wojciki male |
 Profile of Nylanderia wojciki male |
- Scapes without macrosetae; 9th sternite greater that 0.15 mm wide . . . . . 8
8
return to couplet #7
- Overall yellow in color; 9th sternite triangular, broadening proximally, with long ventral apodeme and short, thin lateral apo-demes . . . . . Nylanderia trageri
- Overall dark brown in color; 9th sternite not triangular; lateral apodemes short and broad . . . . . Nylanderia parvula
9
return to couplet #6
- Segment IV of antennae is distinctly bent . . . . . 10
- Segment IV of antennae in line with remainder of funicular segments . . . . . 11
10
return to couplet #9
- Parameres curving strongly inward; digiti and aedeagal valves not tapering then broadening into rounded tip; 9th sternite broadening proximally with large, digitiform medial apodeme . . . . . Nylanderia vividula
 Head of Nylanderia vividula male |
 Profile of Nylanderia vividula male |
- Parameres not strongly curving inward; digiti and aedeagal valves tapering then broadening into rounded tips; 9th sternite with tapering, nearly digitiform medial apodeme . . . . . Nylanderia terricola
11
return to couplet #9
- More than 12 macrosetae present on each scape . . . . . Nylanderia hystrix
- Fewer than 12 macrosetae present on each scape . . . . . 12
12
return to couplet #11
- Body bicolored or with darker gaster . . . . . 13
- Body uniform in color . . . . . 14
13
return to couplet #12
- Body yellow; 9th sternite rectangular . . . . . Nylanderia querna
- Body brown; 9th sternite triangular . . . . . Nylanderia faisonensis
14
return to couplet #12
- Overall body yellow in color . . . . . Nylanderia guatemalensis
- Overall body brown in color . . . . . 15
15
return to couplet #14
- Mesocoxae and metacoxae always whitish, strongly contrasting with brown body . . . . . Nylanderia steinheili
 Head of Nylanderia steinheili male |
 Profile of Nylanderia steinheili male |
- Mesocoxae and metacoxae not whitish, not strongly contrasting with body . . . . . 16
16
return to couplet #16
- 9th sternite spade-like, broadening proximally, with very short, broad lateral and ventral apodemes; scapes brown in color . . . . . Nylanderia concinna
 Head of Nylanderia concinna male |
 Profile of Nylanderia concinna male |
- 9th sternite not spade-like or triangular; scapes yellowish in color . . . . . 17
17
return to couplet #16
- Mesosoma entirely covered in a dense layer of pubescence . . . . . 18
- Mesosoma with a dense layer of pubescence on dorsum; remainder of mesosoma without pubescence . . . . . 19
18
return to couplet #17
- Paramere apices triangular and weakly sclerotized (yellow to slightly darker coloration); macrosetae originating from the paramere margin scattered and not fan-like (see Nylanderia pubens for additional details and images) . . . . . Nylanderia fulva
 Head of Nylanderia fulva male |
 Profile of Nylanderia fulva male |
- Paramere apices rounded and well sclerotized (dark brown coloration); macrosetae originating from the paramere margin in a dense, fan-like configuration (see Nylanderia pubens for additional details and images) . . . . . Nylanderia pubens
 Head of Nylanderia pubens male |
 Profile of Nylanderia pubens male |
19
return to couplet #17
- Overall body dark brown to black with yellow legs . . . . . Nylanderia flavipes
- Overall body medium brown to reddish brown with legs the same color as body . . . . . Nylanderia austroccidua