Tetramorium paraarmatum

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Tetramorium paraarmatum
Temporal range: Bartonian, Middle to Late Eocene Baltic amber, Baltic Sea region
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Tetramorium
Species: T. paraarmatum
Binomial name
Tetramorium paraarmatum
Radchenko & Dlussky, 2015

Radchenko dlussky 2015-3.jpg


Material examined: queen (dealate), holotype, No 15440, Muzeum Ziemi PAN, Baltic Amber, Gdansk-Stogi, Poland.


This taxon was described from Baltic amber (Bartonian, Middle to Late Eocene).



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

  • paraarmatum.Tetramorium paraarmatum Radchenko & Dlussky, 2015: 312, figs. 1-2 (q.) BALTIC AMBER.


Q u e e n (fi g. 1, 2). Head longer than broad (HL/HW 1.20), with subparallel sides, straight occipital margin and rounded occipital corners. Lateral portions of clypeus raised in both sides into a sharp shield-like ridge in front of antennal insertions, so that antennal sockets separated from the clypeal surface. Eyes well developed, of moderate size. Anterior clypeal margin convex, with shallow medial notch. Antenna 12-segmented, with 3-segmented apical club, scape short, far not reaching occipital margin (SL/HL0.58, SL/HW 0.69). Mesosoma quite long and narrow (SCL/SCW 3.23), flattened, pronotum does not overlapped by scutum, its anterior and lateral parts visible from above. Propodeum with relatively long, blunt, subparallel and directed backward spines (ESL/HW 0.17, ESD/ESL 1.27). Petiole relatively long and narrow (PL/PW 1.71), with not very long peduncle, its node apparently cuneiform. Postpetiole broader than length, but not strongly widened (PPL/PPW 0.67).Hind tibia with one simple spur (second, smaller spur, is invisible). Head dorsum smooth, only gena, frontal lobes and lower part of frons laterally with fine longitudinal striation. Scutum and scutellum smooth, pronotum and dorsal surface of propodeum with fine transversal striation. Head margins with quite abundant, not too long suberect hairs; mesosoma with similar hairs, waist, and especially gaster, with more abundant, longer hairs. Legs with short subdecumbent hairs (only partly visible). Total length ca 3.5 mm. Measurements (in mm): HL 0.66, HW 0.55, SL 0.38, ML 0.85, PL 0.24, PW 0.14, PPL 0.14, PPW 0.21, HTL 0.35, ESL 0.11, ESD 0.14, ScW 0.13, ScL 0.42. Workers and males unknown.

E t y m o l o g y. From the Greek prefi x “para” — beside, near, and the species name Tetramorium armatum Santschi, 1927, to what described species resembles.