Astreptolabis
| Astreptolabis ethirosomatia Temporal range: Albian | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Dermaptera |
| Family: | Pygidicranidae |
| Genus: | †Astreptolabis |
| Species: | † A. ethirosomatia |
| Binomial name | |
| Astreptolabis ethirosomatia Engel, 2011 | |
Astreptolabis is an extinct genus of earwig in the Dermaptera family Pygidicranidae known from a Cretaceous fossil found in Burma. The genus contains a single described species, Astreptolabis ethirosomatia and is the sole member of the subfamily Astreptolabidinae.[1]
History and classification
Astreptolabis is known only from a single fossil, the holotype, specimen number AMNH Bu-FB20, which is housed in the Amber Fossil Collection of the American Museum of Natural History in New York City. The specimen is composed of a fully complete adult female earwig which has been preserved as an inclusion in a transparent chunk of Burmese amber.[1] The age of the amber deposits in Kachin State of northernmost Burma are understood to be at least 100 million years old, placing them in the Albian age of the Cretaceous.[2] The Astreptolabis holotype was recovered from outcrops near the city of Myitkyina in Kachin State and was first studied by paleoentomologist Michael S. Engel of the Division of Entomology at the University of Kansas in Lawrence, Kansas.[1] Engel's 2011 type description of the new species was published in the online journal ZooKeys.[1] The genus name Astreptolabis was coined by Engel as a combination of Greek words astreptos, which means "not curved" and labis, which means "forceps". This is in reference to the distinct structuring of the type specimens cerci or "pincers". The specific epithet ethirosomatia is from the Greek words etheira and somation, which translate as "hairy" and "body" respectively. The subfamily name Astreptolabidinae is derived from the genus name with the suffix -inae added.[1]
Astreptolabis is one of six described earwig species found in Burmese amber. One other species Tytthodiplatys mecynocercus was described by Engel in the same 2011 paper, while Burmapygia resinata was described by Engel and David Grimaldi in 2004, with a fourth species Myrrholabia electrina first described by Theodore Cockerell in 1920.[1] An additional fifth and sixth species Zigrasolabis speciosa and Toxolabis zigrasi were described by Engel and Grimaldi in 2014 paper.[3]
Description
The holotype specimen of Astreptolabis is a complete adult female with an overall coloration that appears to be mat brown to dark brown. The female is approximately 3.5 millimetres (0.14 in) in length when the cerci are included. The body is overall densely covered in setae that are not thickened enough to be chaetulose. The antennae have a stout scape and are at least fourteen flagellomeres long. As is typical with earwigs, the forewings have been modified into tegma. The tegma cover the four first segments of the abdomen and the abdomen comprises eight visible segments, also typical for female earwigs. The hind wings are present, but due to positioning of the tegma, are mostly obscured. The slender cerci are tubular and straight, tapering along the length to sharp points at the ends.[1]
References
- 1 2 3 4 5 6 7 Engel, M.S. (2011). "New earwigs in mid-Cretaceous amber from Myanmar (Dermaptera, Neodermaptera)". ZooKeys 130: 137–152. doi:10.3897/zookeys.130.1293.
- ↑ Poinar Jr, G.; Huber, J.T. (2011). "A new genus of fossil Mymaridae (Hymenoptera) from Cretaceous amber and key to Cretaceous mymarid genera". ZooKeys 130: 461–472. doi:10.3897/zookeys.130.1241. PMC 3260775. PMID 22259293.
- ↑ Engel, MS; Grimaldi, D (2014). "New mid-Cretaceous earwigs in amber from Myanmar (Dermaptera)". Novitates Paleoentomologicae 6: 1–16.