| Acanthostichus femoralis|
Mackay (1996) - Soil inhabiting species which preys on termites. Specimens have been found under cattle manure. One colony was found nesting in soil near the nest of Acromyrmex sp. (Kusnezov. 1962). Another series was collected with Pheidole sp. (Willink. per. comm.). Flights recorded during all months except Feb. Aug. and Oct. (Kusnezov. 1962). It is one of the few species which flies during the winter in Argentina.
A member of the brevicornis species complex. Mackay (1996) - The workers of this species can be separated from most others (except Acanthostichus sanchezorum) as the spiracle is located high on the propodeum. It could only be confused with A. sanchezorum, from which it can be distinguished as the outer surface of the scape is convex and it does not have an angle near the apex. as occurs in A. sanchezorum. The male of this species is easily distinguished from all others in that the petiole is nearly quadrate. but is strongly constricted on the two lateral surfaces. Otherwise it could be confused with Acanthostichus brevinodis or even with Acanthostichus fuscipennis. The single male was not associated with workers. but was labeled as A. femoralis. It seems reasonable that it is correctly identified. but must remain questionable until we have a complete series.
Keys including this Species
Distribution based on Regional Taxon Lists
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The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- femoralis. Acanthostichus femoralis Kusnezov, 1962a: 126, figs. 2, 3 (w.) ARGENTINA. Mackay, 1996: 150 (m.).
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Mackay (1996) - HL 0.69-0.91, HW 0.54-0.76, SL 0.30-0.34, SW 0.11-0.15, WL 0.80-1.30, FL 0.41-0.51, FW 0.19-0.34, PW 0.28-0.41, PL 0.31-0.45, SI 37-44, CI 78-84, PI 109-114, FI 152-220, SL/SW 2.25-2.67.
Lateral angles on clypeus poorly defined; anterior borders of scape convex; head elongate, concave at vertex; femora of all legs, especially posterior, strongly incrassate (Fig. 44); petiole elongate, strongly concave anteriorly (Fig. 22); ventral process poorly developed. Glossy and shining, light brown throughout, scattered erect hairs on all surfaces.
Mackay (1996) - Similar to most other species, except petiole is nearly quadrate and strongly constricted on the sides.
Mackay (1996) - Worker, ARGENTINA: Western Formosa State, Ingeniero Juarez train station (Fundacion e Instituto Miguel Lillo , Museo Argentino de Ciencias Naturales, Museum of Comparative Zoology) [paratypes seen]. Holotype worker. # 10423 (IMLA) [not seen] and 41 cotype workers. #'s 10422. 10424. 10449 (IMLA) [6 seen]. 2 paratype workers (MCZC) [seen]. Rio Argentina. Formosa. viii - 1958 [listed as July in Kusnezov (1962)]. Ing. Juarez. Col. N. Kusnezov.
- Agosti, D. 1998b . The ant (Hymenoptera: Formicidae) types in Argentinian collections. J. N. Y. Entomol. Soc. 105: 199-205 (page 199, types)
- Kusnezov, N. 1962a. El género Acanthostichus Mayr (Hymenoptera, Formicidae). Acta Zool. Lilloana 18: 121-138 (page 126, figs. 2, 3 worker described)
- MacKay, W. P. 1996. A revision of the ant genus Acanthostichus (Hymenoptera: Formicidae). Sociobiology 27: 129-179 (page 150, male described)