Elephantomyia baltica

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Elephantomyia baltica
Temporal range: Middle Eocene
Elephantomyia (E.) baltica fig 1 01.jpg
illustrations of E. (E.) baltica anatomy
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Diptera
Family: Limoniidae
Genus: Elephantomyia
Species:
†E. baltica
Binomial name
†Elephantomyia baltica
Alexander, 1931

Elephantomyia (Elephantomyia) baltica is an extinct species of crane fly in the family Limoniidae. The species is solely known from the Middle Eocene [1] Baltic amber deposits in the Baltic Sea region of Europe. The species is one of six described from Baltic amber. [1] [2]

Contents

History and classification

Elephantomyia (Elephantomyia) baltica is known from the holotype specimen, collection number 282, a solitary complete adult which has been preserved as an inclusion in transparent Baltic amber. As of 2015, the amber specimen, number 282, was included in the collections of the University of Göttingen. [2] Baltic amber is recovered from fossil bearing rocks in the Baltic Sea region of Europe. Estimates of the age date between 37 million years old, for the youngest sediments and 48 million years old. This age range straddles the middle Eocene, ranging from near the beginning of the Lutetian to the beginning of the Pribonian. E. baltica is one of six crane fly species in the genus Elephantomyia described from the Baltic amber, the others being E. brevipalpa , E. bozenae , E. irinae , E. longirostris , and E. pulchella . [2] All six species are placed into the Elephantomyia subgenus Elephantomyia based on the lack of tibial spurs and by several aspects of the wing morphology.

The fossil was first studied by entomologist Charles Paul Alexander of the Massachusetts Agricultural College, with his 1931 type description of the new species being published in his monograph Crane flies of the Baltic Amber (Diptera). The fossil was reexamined and the species redescribed in 2015 by paleoentomologist Iwona Kania of the University of Rzeszów. [2]

Description

The E. baltica specimen is a well preserved male with an overall length of 9.5 mm (0.37 in), not including the rostrum and an overall brown coloration. The head has a rostrum that is 8.5 mm (0.33 in) long, as long as the fore wing and longer than the abdomen, baring elongate palpus at the tip. Each palpus is composed of four segments all having a system of microtrichia hairs, and three of the four are elongate cylinders with the fourth being short. The antennae are small, composed of a cylindrical scape and widened pedicle. As the flagellomeres progress from the base to the tip of the antennae they change from squat and crowded together to elongated and having two hairs on each flagellomere. The wings are 8.5 mm (0.33 in) with a pale brown pterostigma that is oval in shape. The Rs vein, as designated by the Comstock–Needham system, is shorter than the connected R2+3+4 [2]

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References

  1. 1 2 Heinrichs, J; Schmidt, AR; Schäfer-Verwimp, A; Gröhn, C; Renner, MAM (2015). "The leafy liverwort Notoscyphus balticus sp. nov. (Jungermanniales) in Eocene Baltic amber". Review of Palaeobotany and Palynology. 217: 39–44. doi:10.1016/j.revpalbo.2015.02.006.
  2. 1 2 3 4 5 Kania, I (2015). "Subfamily Limoniinae Speiser, 1909 (Diptera, Limoniidae) from Baltic Amber (Eocene): The Genus Elephantomyia Osten Sacken, 1860". PLOS ONE. 10 (2): 1–25. Bibcode:2015PLoSO..1017434K. doi: 10.1371/journal.pone.0117434 . PMC   4338262 . PMID   25706127.
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