Ponera testacea

Ponera testacea is, in Germany, typically found in open and very xerothermous grasslands on limestone, silicate rock, or sand. It has so far not been found in xerothermous woodland with higher humidity and seems to be rare in urban habitats. In Hungary, testacea is often collected in warm and dry habitats like sandy grasslands and dry rocky calcareous grasslands.

Identification
Very similar to Ponera coarctata, these two species can be difficult to separate from one another. Csosz and Seifert (2003) - In the workers, Ponera testacea differs from coarctata by a number of metric characters. These are smaller absolute size, lower distance of small foveolae on dorsum of first gaster tergite, a lower height vs length ratio of petiole node, a lower average pigmentation score, a lower height vs. length ratio of petiole, and a wider frons ratio (FR/CS). These differences are repeated in the gynes.

Distribution
Emery (1895, 1909) roughly stated the occurrence of testacea in the Mediterranean region (S France, entire Italy, Corsica, and Spain). Our examinations revealed that it is widely distributed in C Europe and spreads north to 51°30’N at least (Eisleben, Germany). (Csosz and Seifert 2003)

This taxon was described from France. It is also found in United Kingdom of Great Britain and Northern Ireland.

Biology
As result of the species splitting and the most difficult discrimination of coarctata and testacea, a post hoc interpretation of literature data is almost impossible and the natural history of both species must be written anew. However, the most detailed studies on the biology of Central European Ponera (Liebig et al. 1995, 1997) can be exclusively referred to Ponera coarctata as our recent investigation of Liebig’s voucher specimens showed. (Csosz and Seifert 2003)

Nomenclature

 *  testacea. Ponera coarctata var. testacea Emery, 1895b: 62 (w.q.) FRANCE. Junior synonym of coarctata: Taylor, 1967a: 21. Revived from synonymy and raised to species: Csösz, 2003: 158; Csösz & Seifert, 2003: 207. Senior synonym of crassisquama: Scupola, 2006: 162.
 * crassisquama. Ponera coarctata var. crassisquama Emery, 1916a: 54, fig. 1 (w.q.) ITALY. [Also described as new by Emery, 1916b: 108.] Junior synonym of coarctata: Taylor, 1967a: 21; of testacea: Scupola, 2006: 162.

Worker


Csosz and Seifert (2003) - Average body length 2.5–3.0 mm. Colour light ochraceous yellow to brownish yellow. Whole body covered with thick decumbent hairs. Mandibles triangular, with 3 apical teeth at the tip of the masticatory border, followed by a regular series of 9–14 minute denticles. Clypeus produced anteriorly, with a rather distinctly raised longitudinal carina. Eyes very small, or invisible, with 0-3 minute facetes. Scape with subdecumbent and suberect hairs. Tibiae frequently with short, decumbent hairs only. Alitrunk relatively lower than in coarctata. Furrow between the mesonotum and anepisternum often missing, or hardly visible. Petiole low and stubby in profile with the anterior and posterior surface running almost parallele. Dorsal surface of petiole large and flat viewed from above, forming more approaching to a half circle than in coarctata. The subpetiolar tooth-like process of petiole forms a well-visible caudoventral triangular projection. Subpetiolar fenestra slightly larger than in coarctata. First gaster tergite with very dense hairs. Average distance of the fine cuticular foveolae on first gaster tergite 16.4 (14.7–18.7) μm.

Queen
Csosz and Seifert (2003) - Similar to the worker. Average body length 3.0 mm. Colour light ochraceous yellow to brownish yellow. Whole body with thick decumbent hairs. The frontal furrow clearly reaches the anteriormost ocellus. Scape with subdecumbent and suberect hairs. Tibiae with exuberant short, decumbent hairs only. Alitrunk relatively lower than in coarctata. Metanotal furrow between the katepisternum and anepisternum not so deep, hardly visible, or sometimes missing. Petiole low and stubby in profile, the anterior and posterior surface running almost parallel in profile. The subpetiolar tooth-like process of petiole often forms a well-visible triangular caudoventral projection. First gaster tergite with very dense hairs, similar to the worker.

Morphometric measurements of 9 gynes (Seifert): CS 671±12 [650,690], FoDG 16.36±1.03 [14.9,17.8], PEL/NOH 1.238±0.063 [1.130,1.342], PiMe 8.26±1.10 [7.3,10.0], CL/CW 1.234±0.023 [1.190,1.255], SL/CS 0.811±0.011 [0.797,0.828], ML/CS 1.663±0.023 [1.635,1.703], MW/CS 0.761±0.025 [0.735,0.811], PEW/CS 0.532±0.020 [0.513,0.571], PEL/CS 0.441±0.014 [0.411, 0.457], NOH/CS 0.357±0.017 [0.330,0.392].

Morphometric measurements of 16 gynes (Csosz): CL 725±14 [710,750], CW 588±13 [570,610], CS 656±13 [640,680], FR 76±5 [68,80], FL 160±7 [150,168], SL 530±12 [515,550], ML 1066±25 [1040,1110], MH 499±25 [480,550], PEH 442±15 [420,460], PH 240±11 [225,260], PL 240±10 [230,260], PEW 0.525±0.017 [0.50,0.566], CL/CW 1,233±0.0154 [1.210,1.256], FL/FR 2.113±0.928 [1.938,2.206], PH/PL 1.004±0.515 [0.923,1.061], ML/MH 1.972±0.051 [1.902,2.018], CL/SL 1.368±0.332 [1.324,1.413].

Male
Csosz and Seifert (2003) - Average body length smaller than 3.00 mm. Colour always black. Whole body with thick decumbent hairs. Head with sparse shorter hairs. Eyes with long hairs among the facetes. Alitrunk less robust in profile view than in coarctata.

Type Material
Csosz and Seifert (2003): Lectotype (worker) by present designation: Bonifacio, leg. Revel 1872, deposited in the “Emery collection”,. Its measurements: CL 655; CW 495; FR 65; FL 140; SL 460; ML 840; PEH 360; PEW 300. Para-lectotypes (3 workers) deposited in“Forel collection”, Muséum d’Histoire Naturelle (Genéve, Switzerland). One specimen Rapallo / Liguria / Mai 1891 / Flach and two other specimens (at one pin) labelled by EMERY “Gallia merid.” and with a blue label “Cotypus”.

Designation of the lectotype – Emery’s original material of Ponera was found to contain no specimens with any type labelling as it had been stated by Taylor. Altogether 15 specimens were received from the Museo Civico di Storia Naturale, Genova and one specimen was fixed by present designation as lectotype of Ponera coarctata var. testacea Emery, 1895. The lectotype had been collected in Bonifacio by Revel in1876. Bonifacio is a small village at the S coast of Corsica. The specimen is in agreement with the type localities and descriptory statements given by Emery who stated “…Francia meridionale, la Liguria, Corsica, e la Spagna… colore testaceo uniforme, o talvolta piu o meno bruno sul dorso…”. Other specimens that could belong to the original material of Emery were not available from the Museo Civico. Emery repeatedly sent ant material to Forel and three specimens within the Forel collection in Muséum d’Histoire Naturelle, Genéve are considered by us as belonging to the original series. One specimen, collected by Flach at Rapallo (Liguria) inMay 1891, and two other specimens (at one pin) labelled by Emery “Gallia merid.” and with a blue label “Cotypus” made by Forel were designated as paralectotypes during the course of this study.

Additional References

 * [[Media:Csosz & Seifert 2003.pdf|Csösz, S., and Seifert, B. 2003. Ponera testacea Emery, 1895 Stat. N. - A sister species of P. coarctata (Latreille, 1802) (Hymenoptera: Formicidae). Acta Zoologica Academiae Scientiarum Hungaricae 49(3): 201-214 PDF]]