Lasius schiefferdeckeri

Distribution
This taxon was described from Baltic Amber (Eocene).

Nomenclature

 * †edentatus. †Lasius edentatus Mayr, 1868c: 46 (m.) BALTIC AMBER (Eocene). Junior synonym of †schiefferdeckeri: Wilson, 1955a: 52. See also: Dlussky, 2011: 211.
 * † schiefferdeckeri. †Lasius schiefferdeckeri Mayr, 1868c: 44, pl. 1, fig. 2; pl. 2, figs. 27-32 (w.q.m.) BALTIC AMBER (Eocene). Senior synonym of †edentatus: Wilson, 1955a: 52.

Worker
Wilson (1955) - (1) Size range and mean, clypeus, mandibular dentition, and appendage pilosity similar to alienus.

(2) ML exceeding EW.

(3) SI very variable, ranging in value from typical Lasius emarginatus through typical (northern European) Lasius niger to typical Lasius brunneus.

Male
Wilson (1955) - (1) Very small, at lower limit of alienus size variation.

(2) Mandible form showing great variation which brackets both the Lasius pallitarsis and niger types, a condition also encountered in the modern species Lasius flavus.

Specimen no. 1. Subapical cleft of mandible present but shallower than in pallitarsis; masticatory border flat; basal angle intermediate in development between pallitarsis and niger. HW 0.77 mm., sr 85. sr very high with respect to modern members of the subgenus, above the emarginatus range but still below that of Lasius productus. Paramere similar in proportionate size and shape to that of alienus.

Specimen no. 2. Mandible partly decomposed and further obscured by a fissure, apparently with a well-developed spical cleft and basal angle. Size somewhat smaller than no. 1. Paramere similar in proportionate size and shape to that of Lasius alienus.

Specimen no. 3. Subapical cleft present but set about one-third back from the apex, an intermediate sitkaensis-niger condition occasionally seen in flavus and rarely in alienus. Basal angle weakly developed, close to niger type. HW ca. 0.66 mm.

Type Material
Wilson (1955) - SYNTYPES. The only specimens designated as types by Mayr were several males inclosed in a single piece of amber in the Menge Collection (Leipzig). These were given as the source of his male diagnosis ("Typen bei der Diagnose") and described as having denticulate mandibles.

Additional References

 * Dlussky G. M. 2011. The Ants of the Genus Lasius (Hymenoptera, Formicidae) from Late Eocene European Ambers. Vestnik zoologii, 45: 209-222 [printed version]; 45(3): e-14—e-27 (DOI 10.2478/v10058-011-0014-5) [PDF version].