| Zigrasolabis | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Dermaptera |
| Family: | Labiduridae |
| Genus: | † Zigrasolabis |
| Species: | †Z. speciosa |
| Binomial name | |
| †Zigrasolabis speciosa | |
Zigrasolabis is an extinct genus of earwig in the family Labiduridae known from Cretaceous fossils found in Myanmar. The genus contains a single described species, Zigrasolabis speciosa. [1]
Zigrasolabis is known from a group of fossils, the holotype, specimen number JZC-Bu232, along with two paratypes and a partial specimen. The specimens are composed of three fully complete adult female earwigs, and the partial female, which have been preserved as inclusions in a single transparent chunk of Burmese amber. [1] The age of the amber deposits in Kachin State in northernmost Burma is understood to be at least 100 million years old, placing them in the Albian age of the Cretaceous. [2] As of 2014, Burmese amber has been radiometrically dated using U-Pb isotopes, yielding an age of approximately 99 million years old, close to the Aptian – Cenomanian boundary. [3] At the time of description, the amber specimen was residing in the private collection of James Zigras and only available for study through the American Museum of Natural History.
The Zigrasolabis type specimens, recovered from amber bearing outcrops in Kachin State, were first studied by paleoentomologists Michael S. Engel of the Division of Entomology at the University of Kansas, and David Grimaldi of the American Museum of Natural History. [1] Engel and Grimaldi's 2014 type description of the new species was published in the journal Novitates Paleoentomologicae . [1] The genus name Zigrasolabis was coined by Engel and Grimaldi as a combination of Greek word labis, which means "forceps" and Zigras in honor of James Zigras. The specific epithet speciosa is from the Latin word speciosus, which translate as "splendid". Zigrasolabis is one of six described earwig species found in Burmese amber. A second species, Toxolabis zigrasi was also described by Engel and Grimaldi in 2014 paper. Two species Astreptolabis ethirosomatia and Tytthodiplatys mecynocercus were described by Engel in the same 2011 paper, while Burmapygia resinata was described by Engel and David Grimaldi in 2004, with the last species Myrrholabia electrina first described by Theodore Cockerell in 1920. [4] [1]
Female Zigrasolabis have and overall coloration that appears to be mat brown to dark brown, lightening on the legs and mouth parts. The females range between approximately 8.0–8.3 millimetres (0.31–0.33 in) in length when the cerci are included. The bodies are only sparsely covered in setae, which are not thickened enough to be chaetulose. The antennae have a slightly wide scape and are at least fourteen flagellomeres long, though both the holotype and the paratypes have incomplete antennae. As is typical with earwigs, the forewings have been modified into tegma which cover the first segments of the abdomen. The hind wings are present, but due to positioning of the tegma, are mostly obscured, though the tips extend beyond the tegma. The slender cerci are tubular and straight, tapering along the length to sharp points at the ends. [1]
Pygidicranidae is a family of earwigs, formerly placed in the suborder Forficulina, now in the suborder Neodermaptera. The family currently contains twelve subfamilies and twenty six genera. Eight of the subfamilies are monotypic, each containing a single genus. Of the subfamilies, both Astreptolabidinae and Burmapygiinae are extinct and known solely from fossils found in Burmese amber. Similarly Archaeosoma, Gallinympha, and Geosoma, which have not been placed into any of the subfamilies, are also known only from fossils. Living members of the family are found in Australia, South Africa, North America, and Asia. The monotypic genus Anataelia, described by Ignacio Bolivar in 1899, is found only on the Canary Islands. As with all members of Neodermaptera, pygidicranids do not have any ocelli. The typical pygidicranid bodyplan includes a small, flattened-looking body, which has a dense covering of bristly hairs (setae). The pair of cerci at the end of the abdomen are symmetrical in structure. The head is broad, with the fourth, fifth and sixth antenna segments (antennomeres) that are not transverse. In general Pygidicranids also have equally sized ventral cervical sclerites, and in having the rearmost sclerite separated from, or only touching the center of the prosternum. Cannibalism of young has been observed in at least one species in the family, Challia hongkongensis, in which an adult female was found eating a still-living nymph of the same species. The same species in a different area has been observed possibly eating fruits or seeds, making the species an omnivore.
Diplatyidae is a family of earwigs in the suborder Neodermaptera. It contains only one subfamily, Diplatyinae, which contains six genera, five modern and one extinct known from fossils. The genus Tytthodiplatys was described in 2011 from a fossil found in Burmese amber which dates to the Albian age of the Cretaceous. It was not placed into the subfamily Diplatyinae, and is the oldest confirmed member of the family.
Labiduridae, whose members are known commonly as striped earwigs, is a relatively large family of earwigs in the suborder Forficulina.
Ektatotricha is an extinct, monotypic, genus of ant-like stone beetle in the family Staphylinidae containing the single species Ektatotricha paradoxa.
Kachinus is an extinct genus of ant-like stone beetle in the family Staphylinidae containing the single species Kachinus antennatus.
Plumalexius is a genus of wasps in the extinct monotypic family Plumalexiidae, containing two species: the type species Plumalexius rasnitsyni, known only from the Late Cretaceous White Oaks Pit in Sayreville, New Jersey, and Plumalexius ohmkuhnlei, known from the Cretaceous Burmese amber.
Astreptolabis is an extinct genus of earwig in the Dermaptera family Pygidicranidae known from a group of Cretaceous fossils found in Myanmar. The genus contains two described species, Astreptolabis ethirosomatia and Astreptolabis laevis and is the sole member of the subfamily Astreptolabidinae.
Tytthodiplatys is an extinct genus of earwig in the family Diplatyidae known from a Cretaceous fossil found in Myanmar. The genus contains a single described species, Tytthodiplatys mecynocercus.
Prostylotermes is an extinct genus of termite in the isopteran family Stylotermitidae known from two Eocene fossils found in India. The genus contains a single described species, Prostylotermes kamboja.
Brownimecia is an extinct genus of ants, the only genus in the tribe Brownimeciini and subfamily Brownimeciinae of the Formicidae. Fossils of the single identified species, Brownimecia clavata, are known from the Middle Cretaceous of North America. The genus is one of several ants described from Middle Cretaceous ambers of New Jersey. Brownimecia was initially placed in the subfamily Ponerinae, until it was transferred to its own subfamily in 2003; it can be distinguished from other ants due to its unusual sickle-like mandibles and other morphological features that makes this ant unique among the Formicidae. The ant is also small, measuring 3.43 millimetres (0.135 in), and a stinger is present in almost all of the specimens collected. The morphology of the mandibles suggest a high level of feeding specialization.
Zigrasimecia is an extinct genus of ants which existed in the Cretaceous period approximately 98 million years ago. The first specimens were collected from Burmese amber in Kachin State, 100 kilometres (62 mi) west of Myitkyina town in Myanmar. In 2013, palaeoentomologists Phillip Barden and David Grimaldi published a paper describing and naming Zigrasimecia tonsora. They described a dealate female with unusual features, notably the highly specialized mandibles. Other features include large ocelli, short scapes, 12 antennomeres, small eyes, and a clypeal margin that has a row of peg-like denticles. The genus Zigrasimecia was originally incertae sedis within Formicidae until a second species, Zigrasimecia ferox, was described in 2014, confirming its placement in the subfamily Sphecomyrminae.
Haidomyrmex is an extinct genus of ants in the formicid subfamily Haidomyrmecinae, and is one of only five genera placed in the tribe Haidomyrmecini. The genus contains three described species Haidomyrmex cerberus, Haidomyrmex scimitarus, and Haidomyrmex zigrasi. All three are known from single Late Cretaceous fossils which have been found in Asia. H. cerberus is the type species and Haidomyrmex the type genus for the tribe Haidomyrmecini.
Burmomyrma is an extinct genus of ant-mimic wasp in the extinct family Falsiformicidae. The genus contains a single described species, Burmomyrma rossi. Burmomyrma is known from a single Middle Cretaceous fossil which was found in Asia.
Toxolabis is an extinct genus of earwig in the dermapteran family Anisolabididae known from a Cretaceous fossil found in Burma. The genus contains a single described species, Toxolabis zigrasi.
Myanmyrma is an extinct genus of ants not placed into any Formicidae subfamily. Fossils of the single known species, Myanmyrma gracilis, are known from the Middle Cretaceous of Asia. The genus is one of several ants described from Middle Cretaceous ambers of Myanmar.
Cananeuretus is an extinct genus of ant in the Formicidae subfamily Aneuretinae, and is one of two Cretaceous genera of the subfamily. The genus contains a single described species Cananeuretus occidentalis and is known from one Late Cretaceous fossil which has been found in North America.
Burmaleon is an extinct genus of lacewing in the family Osmylidae known from fossils found in Asia. The genus contains a single species, Burmaleon magnificus.
Gerontoformica is an extinct genus of stem-group ants. The genus contains thirteen described species known from Late Cretaceous fossils found in Asia and Europe. The species were described between 2004 and 2016, with a number of the species formerly being placed into the junior synonym genus Sphecomyrmodes.
Camelomecia is an extinct genus of stem-group ants not placed into any Formicidae subfamily. Fossils of the single known species, Camelomecia janovitzi, are known from the Middle Cretaceous of Asia. The genus is one of several ants described from Middle Cretaceous ambers of Myanmar.
Ceratomyrmex is an extinct genus of ant in the Formicidae subfamily Haidomyrmecinae, and is one of only five genera placed in the tribe Haidomyrmecini. The genus contains a single described species Ceratomyrmex ellenbergeri and is known from several Late Cretaceous fossils which have been found in Asia.