Zigrasimecia tonsora

	† Zigrasimecia tonsora
	; Zigrasimecia tonsora in amber
Scientific classification
{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{\| 1}} \| 1}} \| 1}} \| 1}} \| 1}} \| 1}} \| 1}} \| 1}} \| 1}} \| 1}} \| 1}} \| 1}} \| 1}} \| 1}} \| 1 }} \| 1}} \| 1}} \| 1}} \| 1}} \| 1}} \| 4}} :	Animals
Kingdom :	Eumetazoi
No rank :	Bilateral symmetrical
No rank :	Primary
No rank :	Molting
No rank :	Panarthropoda
Type of:	Arthropods
Subtype :	Tracheo-breathing
Overclass :	Six-legged
Grade:	Insects
Subclass :	Winged insects
Infraclass :	Winged insects
Treasure :	Fully Transformed Insects
Squadron :	Hymenopterida
Squad:	Hymenoptera
Suborder :	Belly-bellied
Infrastructure :	Stinging
Superfamily :	Formicoidea
Family:	Ants
Subfamily :	† Sphecomyrminae
Tribe :	† Sphecomyrmini
Gender:	† Zigrasimecia
View:	† Zigrasimecia tonsora
International scientific name
	Zigrasimecia tonsora Barden & Grimaldi , 2013 .
23.03	Neogene
66.0	Paleogen
199.6	Yura
251	Triassic
359.2	Carbon
416	Devonian
443.7	Silur
488.3	Ordovician
542	Cambrian
4570	Precambrian

Zigrasimecia tonsora (lat.) Is a fossil species of ants of the genus Zigrasimecia from the subfamily Sphecomyrminae . It was found in Burmese amber of the Cretaceous period ( Kachin state , near Myitkyin , northern Myanmar , southeast Asia), about 100 million years old ^[1] .

Content

Description

They are distinguished by the unusual structure of a wide clypeus , covered along the front edge with approximately 30 denticles (wide with rounded apices). Under it there is a similar subclipeal row of 15 denticles (above the mouth opening). The total estimated ant length is about 3 mm. Antennae 12-segmented (1.42 mm long), scapus relatively very short (0.22 mm long). The mandibular palps consist of 5 segments. The head is wide and slightly flattened (width - 0.76 mm), chest length 1.4 mm. The mandibles are short with two teeth and numerous spiked sets. The eyes are located in the rear half of the head, small (their length is 0.21 mm, width - 0.13 mm). Ocelli are large (with a diameter of about 0.06) ^[1] .

In 2014, a second species of the genus was described: Zigrasimecia ferox Perrichot, 2014 † ^[2] .

Side view
View from above
Front head
Zigrasimecia tonsora in amber

Etymology

The genus was described in 2013 by American entomologists Phillip Barden and David Grimaldi , American Museum of Natural History , New York, and named after Mr. James Zigras , who provided this and other valuable specimens. amber ^[1] .

Notes

↑ ¹ ² ³ ⁴ Barden, P .; Grimaldi, D. A new genus of highly specialized ants in Cretaceous Burmese amber (Hymenoptera: Formicidae) (English) // Zootaxa . - Magnolia Press, 2013 .-- Vol. 3681, no. 4 . - P. 405-412. - ISSN 1175-5326 . doi: 10.11646 / zootaxa.3681.4.5 (24 Jun. 2013)
↑ Perrichot V. A new species of the Cretaceous ant Zigrasimecia based on the worker caste reveals placement of the genus in the Sphecomyrminae (Hymenoptera: Formicidae) // Myrmecological News. - 2014.

Literature

Dlussky, GM (1996). Ants (Hymenoptera: Formicidae) from Burmese amber. Paleontological Journal, 30 (4), 449–454.
Ward, PS (2007). Phylogeny, classification, and species-level taxonomy of ants (Hymenoptera: Formicidae). Zootaxa , 1668, 549-563.

[Barden-1] ¹ ² ³ ⁴ Barden, P .; Grimaldi, D. A new genus of highly specialized ants in Cretaceous Burmese amber (Hymenoptera: Formicidae) (English) // Zootaxa . - Magnolia Press, 2013 .-- Vol. 3681, no. 4 . - P. 405-412. - ISSN 1175-5326 . doi: 10.11646 / zootaxa.3681.4.5 (24 Jun. 2013)

[2] Perrichot V. A new species of the Cretaceous ant Zigrasimecia based on the worker caste reveals placement of the genus in the Sphecomyrminae (Hymenoptera: Formicidae) // Myrmecological News. - 2014.