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Dlusskyus groehni
| †Dlusskyus groehni Temporal range: Priabonian, Late Eocene Baltic amber, Baltic Sea region | |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Hymenoptera |
| Family: | Formicidae |
| Subfamily: | Dolichoderinae |
| Genus: | Dlusskyus |
| Species: | †D. groehni |
| Binomial name | |
| †Dlusskyus groehni Radchenko, 2023 | |
Described from a single male from late Eocene (37.8–33.9 Ma) Baltic amber.
Photo Gallery
Radchenko (2023), Figure 11. Differences in the values of the indices Icu and Icua in the males of Aneuretinae, Dolichoderinae and Ponerinae (after Dlussky and Perfilieva 2014, with modifications and additions). Legend: white square – Britaneuretus anglicus (Cockerel, 1915), black cross – Aneuretus simoni Emery, 1893, black star – Paraeneuretus tornquisti Wheeler, 1915 (Aneuretinae); transparent dots – Dolichoderinae; black triangle – Dlusskyus groehni gen. et sp. nov.; black dots – Ponerinae.
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Identification
Radchencko (2023) - Based on the combination of one-segmented petiole and the gaster without constriction between the first and second segments (= III and IV abdominal segments) Dlusskyus belongs to the formicomorph group of subfamilies (sensu Bolton 2003), which include the Formicinae Latreille, 1809, Dolichoderinae and Aneuretinae Emery, 1913. The forewings of Dlusskyus have closed cells 1+2r, 3r, rm and mcu, which are found in all known extant and extinct genera of Aneuretinae and in many Dolichoderinae. On the contrary, the closed cell rm is absent in all Formicinae genera what rules out Dlusskyus belonging to this subfamily.
Distribution
This taxon was described from Baltic amber, Baltic Sea region, Europe (Priabonian, Late Eocene).
Biology
Castes
Only known from the male caste.
Nomenclature
The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.
- †groehni. †Dlusskyus groehni Radchenko, 2023: 43, figs. 1-8 (m.) BALTIC AMBER (Eocene).
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Description
Male
L 0.73, HW 0.65, SL 0.21, OL 31, GL 0.10, CpL 0.20, MdL 0.33, PL 0.23, PNdL 0.13, ML 1.17, ScW 0.56, Sc+SctL 0.75, HTL 0.62, FWL 2.63, FWW 0.86, GAL 1.15, FSL-1 0.10, FSL-2 0.30, FSL-3 0.21, FSL-4 0.20, FSL-5…7 0.17, FSL-8...11 0.16, FSL-12 0.22, width of all antennal segments ca. 0.08, MPL-3 0.10, MPL-4 0.14, MPL-5 0.13, MPL-6 0.8; HL/HW 1.12, SL/HL 0.29, SL/HW 0.32, SL/FSL-2 0.70, OL/HL 0.43, GL/OL 0.33, CpL/HL 0.27, MdL/HL 0.45, PL/HL 0.32, PL/PNdL 1.8, ML/ScW 2.09, ScL/ScW 1.35, ML/HTL 1.88, HTL/HL 0.86.
Body length ca. 3.3 mm. Head slightly longer than wide, smoothly rounded above eyes, occipital corners not marked, occipital margin convex. Antennal scape ca. 0.3 times as long as head. Eyes ca. 0.4 times as long as head. Ocelli big, forming equilateral triangle. Genae short, ca. 0.3 times as long as eyes. Mandibles 0.45 times as long as head. Mesonotum slightly convex, propodeum lying somewhat lower than mesonotum (seen in profile). Scutum width ca. 0.75 times the length of scutum+scutellum. Propodeum barely visible, but seems rounded, without tubercles or teeth. Gaster elongate-oval, ca. twice as long as wide. Body finely sculptured. Head dorsum, scutum and scutellum with superficial microreticulation, scutum additionally with scattered piligerous pits, frons, area near ocelli, and gaster almost smooth and shiny. Occipital margin with a few long, erect, somewhat curved hairs, anterior clypeal margin and mandibles with shorter erect to suberect hairs. Head, mesonotum and gaster without decumbent pubescence, clypeus, antennae and legs with a very dense, short depressed pubescence.
Character of forewing venation: vein section 1RS vertical, merging with vein R at a right angle; cross-vein 2r+rs vertical, merging with vein RS at a right angle; cross-veins 2r+rs and rs-m coincide on vein RS (vein section 4RS is absent); cell 3r relatively short, 1.15 times as long as cell 1+2r and 0.24 times as long as wing, far not reaching distal wing margin; cell rm subtriangular (vein section 2M is absent), ca. 3 times as long as wide, not pedicellate, far not reaching distally level of pterostigmal apex; cell mcu almost trapezoid, ca. 1.2 times as long as wide, not reaching distally level of pterostigmal base; cell cua absent; vein section 2Cu very long, almost reaching posterior margin of wing, curved but not angulated basally and does not confluent with vein A; vein section 4M straight and long, almost reaching posterior margin of wing; cross-vein cu-a merging with vein section 1M+Cu not too close to cell mcu, vein section 2M+Cu subequal to 1Cu and 1.7 times as long as cross-vein cu-a; Icu = 1.94, Icua = 1.36. Hind wings venation: free medial section Cu slightly curved; cross-vein rs-cu very slightly curved; veins R1 absent; vein R, cross-vein rs-cu and vein section 2RS diverge from same knot; cross-vein cu-a located approximately at midlength between base of wing and branching of rs-cu and Cu, so that vein sections 1M-Cu and 2M-Cu subequal in length.
Type Material
- Holotype male, complete specimen, GPIH 5072 (CCGG 6742) (AntWeb CASENT0917557) (LIB). Poland, Baltic amber, Late Eocene, Priabonian stage, 33.9–37.8 Ma.
Etymology
The species is dedicated to Mr. Carsten Gröhn (Glinde, Germany), who kindly provided the holotype specimen for investigation.