Solenopsis whitfordi

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Solenopsis whitfordi
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Solenopsidini
Genus: Solenopsis
Species complex: pygmaea
Species: S. whitfordi
Binomial name
Solenopsis whitfordi
Mackay, Moreno & Pacheco, 2013

Solenopsis whitfordi holotype side.jpg

Solenopsis whitfordi holotype top.jpg

Specimen labels

The only sample of Solenopsis whitfordi was collected from an extraction of soil in a creosotebush shrubland area.

Identification

A New World thief ant that is a member of the pygmaea species complex.

Pacheco and Mackay (2013) – Worker - This is a minute, concolorous pale yellow species. The head is elongate with coarse cephalic punctures. The eye is minute and appears to have only one ommatidium. The lateral clypeal teeth are well developed and the extralateral teeth are weakly developed. It is moderately hairy with erect and suberect hairs of various lengths on all body surfaces.

This species may be confused Solenopsis ocellata. The greater number of longer hairs present on the first tergum of the gaster of S. ocellata is the distinguishing feature. Solenopsis ocellata has more than 20 erect hairs (many over 0.05 mm) on the first tergum of the gaster, separating it from S. whitfordi, which usually has fewer than 20 hairs between 0.03-0.04 mm in total length. Solenopsis ocellata can further be separated from S. whitfordi in being consistently larger in total length and having striae on the mesopleuron, a feature absent in S. whitfordi.

Keys including this Species

Distribution

Known only from the type locality, the Jomada Experimental Range in New Mexico (45K NE of Las Cruces).

Distribution based on Regional Taxon Lists

Nearctic Region: United States (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.
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Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.
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Biology

Castes

Known only from the worker caste.

Nomenclature

The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • whitfordi. Solenopsis whitfordi Mackay, Moreno & Pacheco, in Pacheco & Mackay, 2013: 359, figs. 359-361 (w.) U.S.A. (New Mexico).
    • Type-material: holotype worker, 8 paratype workers.
    • Type-locality: holotype U.S.A.: New Mexico, Dona Ana County, Jornada Range, 415 mi. [correctly 41.5 mi.?] N Las Cruces, 5.x.1983, #1312 (W. Mackay); paratypes: 3 workers with same data, 5 workers with same data but 11.ix.1983, #1112 (W. Mackay).
    • Type-depositories: MCZC (holotype); MCZC, WEMC (paratypes).
    • Distribution: U.S.A.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.

Description

Worker

Measurements (n=2). TL 1.26; HL 0.360; HW 0.270-0.288 (0.279); EL 0.018; ED 0.012; SL 0.192-0.198 (0.195); FSL 0.072; CI 75.0-80.0 (77.5); SI 53.3-55.0 (54.2); PL 0.072; PW 0.090; PI 80.0; PPL 0.078; PPW 0.096; PPI 81.3; WL 0.240; PSL 0.012; PSW 0.012.

Head elongate, with abundant coarse punctures, larger than hairs that originate from them, thickened viewed laterally (~0.180 mm dorsally-ventrally), dorsal and ventral surfaces of head flat, sides of head straight, posterior border slightly concave; predominately yellow, darker mandibles; lateral clypeal teeth well developed, medial tooth absent, extralateral bumps poorly developed, scape extends slightly more than half length of head; eye clearly visible, usually light brown, one ommatidium; mesosoma very straight in profile, punctures on mesosoma and gaster similar, surfaces between punctures smooth and glossy; petiole as in other members of complex.

Short (~0.030 mm), erect hairs sparse on head; mesosoma with erect and suberect hairs (0.03 mm); suberect hairs (0.040 mm) on first tergum of gaster.

Type Material

Holotype worker (Museum of Comparative Zoology) and 3 paratype workers (William and Emma Mackay Collection, MCZC), United States, New Mexico, Dona Ana Co., Jomada Range, 415 m N of Las Cruces, 5-x-1983, W. Mackay #1312; same locality, ll-ix-1983, W. Mackay #1112 (5 workers CWEM).

Etymology

This species is named to honor of our close friend and colleague, Walter G. Whitford, who has published numerous papers on the ants of the southwest USA.

References

References based on Global Ant Biodiversity Informatics

  • 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.