Key to Strumigenys of Hispaniola

This worker key is based on: [[Media:Booher, D.B., Prebus, M.M. et al. 2019. A taxonomic revision of the Strumigenys nitens and simulans groups.pdf|Booher, D.B., Prebus, M.M., Lubertazzi, D. 2019. A taxonomic revision of the Strumigenys nitens and simulans groups (Hymenoptera: Formicidae), two Caribbean radiations of leaf litter ants. Zootaxa 4656, 335-358 (doi:10.11646/zootaxa.4656.2.7).]]

The Hispaniola ant fauna consists of eleven species.

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 * Strumigenys
 * Ants of Hispaniola

1

 * Dorsum of pronotum without sculpture . . . . . 2


 * Dorsum of pronotum variously sculptured, at least some striations or punctuation evident in either dorsal or lateral view . . . . . 4

2
return to couplet #1
 * Dorsum of head smooth and shining medially and posteriorly; propodeal spines present; darker brown species . . . . . 3


 * Dorsum of head heavily punctate over entire surface; propodeum without spines; dull and light orange . . . . . Strumigenys membranifera

3
return to couplet #2
 * Mandibular teeth elongate and spiniform with first two teeth not overlapping or interlocking when shut . . . . . Strumigenys zemi


 * Mandibles with small, conical, serially dentate teeth that interlock when shut . . . . . Strumigenys economoi

4
return to couplet #1
 * In full face view mandibles shorter (MI ≤ 25), with a series of alternating, bluntly rounded, triangular teeth that interlock in closed position; outline of mandibles triangular . . . . . Strumigenys nigrescens


 * In full face view mandibles longer (MI ≥ 26 and usually much longer, MI >50), meeting only at the distal tip, never with a basal series of interlocking teeth in closed position; outline of mandibles not triangular . . . . . 5

5
return to couplet #4
 * Antenna with 4 segments; in full face view mandibles strongly convex, bow-like, with a single pair of long spiniform teeth, just distal to midpoint of mandible, that are much longer than the maximum width of mandible; mandibles relatively short (MI ≤ 40). In full frontal view, entire dorsal surface of head and anterior margin of scape with apically expanded, orbicular setae . . . . . Strumigenys emmae


 * Antenna with 6 segments; In full face view mandibles elongate (MI > 50), linear, and not bow-like; without spiniform teeth near midpoint of mandible; setae on head and scape fine to spoon-shaped, but never orbicular . . . . . 6

6
return to couplet #5
 * Petiole, postpetiole, and gaster with abundant, long, filiform to flagellate setae; absent of shorter laterally expanded clavate setae; dorsal margin of antennal scrobe with two long flagellate setae, one at mid-scrobal position just above the compound eye and another at apicoscrobal position . . . . . Strumigenys lanuginosa


 * Erect setae, when present on the petiole, postpetiole, or gaster, are short and stiff and/or laterally expanded, never flagellate; erect scrobal setae, when present, are limited to a single pair of clavate to flagellate setae in apicoscrobal position . . . . . 7

7
return to couplet #6
 * Setae on leading edge of scape all curve away from the base of the scape; petiole with ventral spongiform tissue; mandibles with two preapical teeth arising in the distal third of mandibles and subequal in length to the width of the mandibles at the point at which they arise . . . . . Strumigenys rogeri


 * Setae on leading edge of scape with one to many setae that curve toward the base of the scape; petiole without ventral spongiform tissue; if more than one preapical tooth or denticle is present, they never approach the width of mandibles where they arise . . . . . 8

8
return to couplet #7
 * Entire surface of first gastral tergite punctate to reticulopunctate; postpetiole in profile with the ventral spongiform lobe absent or reduced to a minute nonspongiform vestige and without lateral flange of spongiform tissue . . . . . Strumigenys eggersi


 * Surface of first gastral tergite without punctate sculpture, or if present, punctate sculpture is limited to the anterior margin; postpetiole in profile with ventral and lateral spongiform tissue present . . . . . 9

9
return to couplet #8
 * Dorsum of head covered with broadly spatulate to spoon-shaped setae; mandibles with a single preapical tooth arising just anterior of apical tooth; without denticles . . . . . Strumigenys louisianae


 * In full face view, setae present across anterior portion of the head and leading edge of scape are curved and flattened or expanded apically, but are not spatulate or spoon shaped; mandibles with at least two preapical teeth or denticles on the distal halves of mandibles . . . . . 10

10
return to couplet #9
 * In full face view, mandibles long with linear to slightly concave outer margin; distal half of mandibles with 4-9 preapical teeth (may be difficult to see); eye larger, usually with 5-6 ommatidia . . . . . Strumigenys gundlachi


 * In full face view, mandibles long and noticeably convex along their outer margin; two preapical teeth present, one near the midpoint of mandibles and one positioned just anterior the dorsoapical tooth; eye small usually with 4 or less ommatidia . . . . . Strumigenys silvestrii