Solenopsis striata

Workers of S. striata were collected in Berlese extraction litter samples from adjacent to a sphagnum bog, lowland forest, mixed oak, ridge forest, montane hardwood, montane transitional and wet montane cloud forests in Panama and Costa Rica at 600-1175 m.

Identification
A New World thief ant that is a member of the molesta species complex. (Key to New World Solenopsis Species Complexes)

Pacheco and Mackay (2013) – Worker - The worker is golden yellow. The funicular segments are 0.120 mm in total length. The eye is small with 3-5 ommatidia. The mesopleuron and metapleuron are completely horizontally striated. The petiolar peduncle has a small tooth ventrally.

The horizontally striated mesopleuron will separate S. striata from most others in the Solenopsis molesta species complex, including Solenopsis laeviceps (Belize to Brazil), in which the mesopleuron is nearly completely smooth and shiny. Solenopsis striata is also similar to Solenopsis joergenseni (Argentina, Paraguay and Brazil) but can be separated as S. striata has a smaller eye composed of 3-5 ommatidia, compared to 8-10 ommatidia for S. joergenseni.

Distribution based on Regional Taxon Lists
Neotropical Region: Costa Rica, Guatemala, Mexico, Panama.

Images from AntWeb
Known only from the worker caste.

Nomenclature

 * . Solenopsis striata Pacheco & Mackay, 2013: 301, figs. 278, 279 (w.) COSTA RICA, PANAMA.
 * Type-material: holotype worker, 61 paratype workers.
 * Type-locality: holotype Costa Rica: Guanacaste, Pitilla Field Station, 600-1175 m., 2.v.1996, and 14.ii.1998, nos 17679, 17692, 17694, 17715, 17722, 17741 (R. Anderson); paratypes with same data.
 * [Note: Pacheco & Mackay do not specify the holotype date or collection number.]
 * Type-depositories: MCZC (holotype); AMNH, CASC, INBC, LACM, MCZC, MPEG, MZSP, USNM, WEMC (paratypes).
 * Distribution: Costa Rica, Panama.

Worker
Measurements (n=5). TL 1.44-1.62 (1.51); HL 0.420-0.426 (0.421); HW 0.360-0.390 (0.369); EL 0.030-0.036 (0.035); ED 0.030; SL 0.288-0.324 (0.313); FSL 0.120-0.132 (0.126); CI 84.5-92.9 (87.8); SI 68.6-77.1 (74.4); PL 0.078-0.084 (0.082); PW 0.090-0.126 (0.113); PI 66.7-86.7 (73.3); PPL 0.102-0.108 (0.106); PPW 0.120-0.144 (0.131); PPI 70.8-90.0 (81.3); WL 0.324-0.342 (0.330); PSL 0.030; PSW 0.030.

Small; concolorous golden yellow; head subquadrate, slightly longer than broad, sides of head convex, posterior border straight; lateral clypeal teeth well developed, extralateral teeth developed as only slightly swollen areas; scape nearly reaching posterior lateral corner of head; eyes small, 3-5 ommatidia; notopropodeal suture deeply depressed; punctures on head small, only slightly larger in diameter than hairs arising from them, all surfaces smooth and glossy, except for mesopleuron and metapleuron, which are latitudinally striated (at least lower half); petiole wider than postpetiole viewed laterally; petiolar node rounded, peduncle with small tooth ventrally; postpetiolar node oval, lacking tooth or flange ventrally.

Abundantly hairy with yellow pilosity; erect and suberect hairs abundant on most surfaces, including scapes and tibiae; longest hairs on mesosoma 0.012 mm; hairs on petiole, postpetiole and gaster curve posteriorly.

Type Material
Holotype worker and 61 paratype workers (,, , , , MCZC, , , ), Costa Rica, Guanacaste, Pitilla Field Station, 600 - 1175m, 2-v-1996, 14-ii-1998, R. Anderson #' s 17679, 17691, 17692, 17694, 17715, 17721, 17722, 17741.

Etymology
From Latin, stria for furrow, referring to the sculpture on the lower mesopleuron and metapleuron.

References based on Global Ant Biodiversity Informatics

 * Castano-Meneses, G., M. Vasquez-Bolanos, J. L. Navarrete-Heredia, G. A. Quiroz-Rocha, and I. Alcala-Martinez. 2015. Avances de Formicidae de Mexico. Universidad Nacional Autonoma de Mexico.
 * Dattilo W. et al. 2019. MEXICO ANTS: incidence and abundance along the Nearctic-Neotropical interface. Ecology https://doi.org/10.1002/ecy.2944
 * Longino J. et al. ADMAC project. Accessed on March 24th 2017 at https://sites.google.com/site/admacsite/
 * Pacheco J. A., and W. P. Mackay. 2013. The systematics and biology of the New World thief ants of the genus Solenopsis (Hymenoptera: Formicidae). Lewiston, New York: Edwin Mellen Press, 501 pp.