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1

Two new fossil species of the ant genus Pristomyrmex Mayr (Hymenoptera: Formicidae) from the Rovno and Bitterfeld ambers

100%
Radchenko A. G., Dlussky G. M.
Annales Zoologici
|
2018
|
tom 68
|
nr 2
The ant genus Pristomyrmex Mayr (subfamily Myrmicinae) comprises about 60 extant species, distributed almost exceptionally throughout the tropics except for Central and South America. Single known fossil species from this genus, P. rasnitsyni Dlussky et Radchenko, was previously described from the Late Eocene Scandinavian amber. Here we described two new extinct species: P. elmesi sp. nov. (worker) from the Rovno amber, and P. archaios sp. nov. (male) from the Bitterfeld amber. P. elmesi differs from P. rasnitsyni by the somewhat smaller size (2.4 mm vs. 3 mm), by the slightly elongated, not transversal head (HL/HW 1.02 vs. 0.95), by the somewhat longer antennal scape (SL/HL 0.75 and SI7HW 0.77 vs. 0.72 and 0.68, respectively), by the much shorter, straight and thin propodeal spines (ESL/HW 0.12 vs. 0.25), by the absence of meadial tooth on the anterior cypeal margin, by the another type of mandibular dentation, and by the longer mesosoma. Male of P. archaios differs from all extant species by the presence of two closed cells, 1r+2r and mcu, on the forewing, while forewing of the modern species has only one closed cell, lr+2r. We consider such kind of forewing venation as the plesiomorphy compare to extant Pristomyrmex species.
2

New species of the extinct ant genus Stigmomyrmex Mayr and designation of the neotype of Stiphromyrmex robustus (Mayr) (Hymenoptera: Formicidae: Myrmicinae)

100%
Radchenko A., Dlussky G. M.
Annales Zoologici
|
2017
|
tom 67
|
nr 4
The extinct ant genera Stigmomyrmex Mayr and Stiphromyrmex Wheeler (subfamily Myrmicinae) were described from the Baltic amber (Late Eocene, Priabonian, ca. 34-38 Ma). A new species, Stigmomyrmex rugulosus sp. nov., is described from the Baltic and Bitterfeld ambers, and a neotype of Stiphromyrmex robustus (Mayr) is designated. Additionally, we found from the Bitterfeld amber three more specimens of S. venustus Mayr, previously the only known species of the genus. S. rugulosus well differs from S. venustus by the presence of longitudinal rugulosity on the head dorsum, mesosoma and waist, and by the presence of numerous suberect hairs on the legs.
3

Fallomyrma gen. nov., a new myrmicine ant genus (Hymenoptera: Formicidae) from the Late Eocene European amber

100%
Dlussky G. M., Radchenko A.
Annales Zoologici
|
2006
|
tom 56
|
nr 1
Fallomyrma, a new monotypie ant genus from the Rovno, Saxonian, and Danish ambers (Late Eocene), and a new species, F. transversa, are described. The taxonomic position and morphological similarity of the new genus to other genera is discussed.
4

First record of the ant genus Crematogaster (Hymenoptera: Formicidae) from the Late Eocene European ambers

100%
Radchenko A., Dlussky G. M.
Annales Zoologici
|
2019
|
tom 69
|
nr 2
The ant genus Crematogaster Lund, 1831 is recorded for the first time from the Late Eocene Rovno amber, Ukraine (Priabonian stage, 33.9–37.8 Ma). C. primitivasp. nov. is described based on single male. It well differs from males of the extant species by the 13-segmented antennae (vs. 11–12-segmented in modern species). By this feature it resembles the fossil C. praecursorEmery, 1891 described from the Sicilian amber (Early Oligocene, Rupelian stage, 27.8–34.9 Ma), but differs from that species by its distinctly longer antennal scape and by some details of the forewing venation. Only one other fossil Crematogaster species is known – C. auroraLaPolla et Greenwalt, 2015, which was described based on the imprints of two queens from the Middle Eocene Kishenehn Formation, USA (ca. 46 Ma); however, we consider that the ascription of this species to Crematogaster is somewhat questionable.
5
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Two new primitive ant genera from the late Eocene European ambers

100%
Dlussky G. M., Radchenko A. G.
Acta Palaeontologica Polonica
|
2009
|
tom 54
|
nr 3
435-441
Two extinct genera of ants from the late Eocene (ca. 40 Ma), Protomyrmica gen. nov. and Plesiomyrmex gen. nov. (family Formicidae, subfamily Myrmicinae), are described based on single specimens (males), from Baltic and Bitterfeld (also called Saxonian) ambers respectively; both genera belong to the tribe Myrmicini. In gross morphology they are similar to modern Myrmica but have a series of apomorphies combined with characters that are plesiomorphic not only in the tribe Myrmicini, but also in the subfamily Myrmicinae. The most significant plesiomorphies concern the antennal structure and wing venation of both genera. The antennal scape is short and the funiculus is filiform, having no apical club. Moreover, the antennae of Protomyrmica are “sphecoid” with the length of the funicular segments gradually decreasing towards the apex (i.e., the longest is basal, starting from the second, and the shortest is apical); this type of structure is basal for the family Formicidae as a whole. Although we consider the wing venation of Protomyrmica to represent the prototype of wings in the subfamily Myrmicinae, it has an apomorphy absent in the modern Myrmicini genera—the antennae are inserted into the head well behind the posterior margin of the clypeus. Plesiomyrmex also has a peculiar apomorphy not found in any other genus of Myrmicinae: the antennae are inserted into toruli located on short sub−vertical tube−like or cup−like structures that protrude distinctly above the head surface. As a result, we do not consider either of the newly described genera to be the direct ancestors of modern Myrmicini; nevertheless, the presence of very ancient plesiomorphies may indicate their antiquity, and thus the latest estimated time for the origin of the tribe Myrmicini should be at least the early Eocene.
6

Boltonidris gen. nov., the first extinct Stenammini ant genus (Hymenoptera, Formicidae) from the Late Eocene Rovno amber

100%
Radchenko A., Dlussky G. M.
Annales Zoologici
|
2012
|
tom 62
|
nr 4
The new extinct ant genus and species, Boltonidris mirabilis, are described from the late Eocene Rovno Amber (Ukraine). This genus belongs to the tribe Stenammini of the subfamily Myrmicinae. It possesses the plesiomorphic characters of the tribe Stenammini, e.g. 12-segmented antennae with 3-segmented apical club, characteristic structure of the clypeus and frontal lobes, absence of gastral shoulder, but it has a series of autapomorphies, e.g. modified mandibles with the only two teeth on the masticatory margin, well developed longitudinal medial groove on the head dorsum, somewhat depressed areas lateral to the frontal carinae (like "vestigial" antennal scrobes), and finely swollen postero-lateral area of head, close to the occipital corners. Additionally, it has two short blunt teeth on the pronotum.
7

New extinct species of the ant genus Carebara (Hymenoptera: Formicidae) from the Late Eocene European ambers

81%
Radchenko A., Dlussky G. M., Grohn C.
Annales Zoologici
|
2019
|
tom 69
|
nr 3
Two new fossil Carebara Westwood (1840) species are described from the Late Eocene Bitterfeld and Baltic ambers: C. kutscheri sp. nov. is described based on soldier and workers, and formally could be attributed to the former genus Pheidologeton Mayr, 1862 (now junior synonym of Carebara); its workers differ clearly from those of any known fossil Carebara species by the much bigger, well-developed eyes, while eyes in the other species are vestigial, containing several facets, and soldier is the first known one for the fossil Carebara species. Carebara groehni sp. nov. is described based on male, and differs clearly from males of C. antiqua (Mayr, 1868) by the distinctly longer antennal scape and the shorter funicular segments. Furthermore, it is somewhat smaller (the total length is ca. 4 mm vs. ca. 5 mm in C. antiqua), with the gradually rounded propodeum, while propodeum in the latter species is slightly angulate. Additional data for males of C. antiqua, including morphometrics, is provided. Taxonomic position of several fossil species ascribed to Carebara, is discussed.
8
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New middle Eocene formicid species from Germany and the evolution of weaver ants

81%
Dlussky G. M., Wappler T., Wedmann S.
Acta Palaeontologica Polonica
|
2008
|
tom 53
|
nr 4
Two new species of weaver ant are described from the Eocene of Germany. Males and gynes of Oecophylla longiceps Dlussky sp. nov. are found in the middle Eocene (about 47 Ma) of Grube Messel, Germany. Males, gynes and two workers of O. eckfeldiana Dlussky sp. nov. are recorded from the middle Eocene (about 43 Ma) of Eckfeld maar, Germany. The two new species are among the oldest records of the extant genus Oecophylla. First adaptations for moving in the forest canopy are present in the workers of O. eckfeldiana. Even more specialized adaptations for arboreal life are found in the workers of O. brischkei from Baltic amber. The coexistence of two species in Baltic amber and in the Bembridge marls suggests that in these cases different ecological niches were realised by sympatric species. Comparisons of the queens from different fossil and extant species indicate morphological trends, partly connected with increasing fertility. Most likely Oecophylla originated in the early Paleogene in the Palaearctic realm, radiating strongly during the climatic changes of the Eocene–Oligocene transition.
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