Emplastus amguensis

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Emplastus amguensis
Temporal range: Rupelian, Oligocene Amgu River, Primorye, Russia
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Dolichoderinae
Genus: Emplastus
Species: E. amguensis
Binomial name
Emplastus amguensis
Perfilieva, 2022

Identification

A triangular radiomedial cell without stem is present in three species of this genus: Emplastus kozlovi (FWL 7.8–8.8 mm in males), Emplastus haueri (FWL 5.4 mm), and Emplastus miocenicus (FWL 10.1 mm). The latter, in addition to its significantly larger size, differs from the new species in the rectangular shape of the mediocubital cell. Emplastus haueri has a relatively short 3r cell and a smaller wing size. The greatest similarity is observed with Emplastus kozlovi from the Eocene marls of Bembridge, but the relatively longer mediocubital cell in E. amguensis (I(mcu) 0.7 and 0.5, respectively) has a different length ratio of 1M and m-cu. The wing sizes in the three species of this genus from Bolshaya Svetlovodnaya are somewhat smaller than in this species (Dlussky et al., 2015).

Wing venation indicates affiliation to Dolichoderinae. Although individually the features of venation in E. amguensis and E. kozlovi are found in extant representatives of several genera of Dolichoderinae, a certain combination of venation features in these imprints is unique (triangular rm, absence of 4RS, trapezoid mcu, and the ratio of 1M and m-cu, I(mcu)). Some extant Tapinoma have the most similar venation (e.g., specimen CASENT0109245, online catalog AntWeb.org), but, at the same time, a different shape of the mediocubital cell and a lower radial cell index (Ir = 0.5). There is also a strong similarity to the wing of the Aneuretinae; however, as noted above, in the absence of a body imprint, I do not consider this variant.

Distribution

This taxon was described from Amgu River, Primorye, Russia (Rupelian, Oligocene).

Castes

Nomenclature

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

  • amguensis. †Emplastus amguensis Perfilieva, 2022: 415, fig. Plate 10, fig. 1 (q.) RUSSIA (Oligocene).

Type Material

  • Holotype. PIN, no. 3135/1, forewing imprint; Primorsky Krai, Tatar Strait, Terney District, right bank of the Kudya River, a tributary of the Amgu River; Lower Oligocene, Granatnenskaya Formation.

Description

References