''Ektatotricha'' is an extinct,

monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unisp ...

, genus of ant-like stone beetle in the family

Staphylinidae The rove beetles are a family (biology), family (Staphylinidae) of beetles, primarily distinguished by their short elytra (wing covers) that typically leave more than half of their abdominal segments exposed. With over 66,000 species in thousand ...

containing the single species ''Ektatotricha paradoxa''. The genus is known from a total of 15 specimens in

amber Amber is fossilized tree resin. Examples of it have been appreciated for its color and natural beauty since the Neolithic times, and worked as a gemstone since antiquity."Amber" (2004). In Maxine N. Lurie and Marc Mappen (eds.) ''Encyclopedia ...

from amber deposits near Tanai Village northwest of

Myitkyina Myitkyina (, ; Jingpho language, Jinghpaw: ''Myitkyina'', ; , ''Sèna'') is the capital city of Kachin State in Myanmar (Burma), located from Yangon, and from Mandalay. In Burmese language, Burmese it means "near the big river", and Myitkyina i ...

in the Kachin region of Myanmar. Burmese amber has been

radiometrically dated Radiometric dating, radioactive dating or radioisotope dating is a technique which is used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed. The method compares t ...

using U- Pb isotopes, yielding an age of approximately 99 million years old, close to the

Aptian The Aptian is an age (geology), age in the geologic timescale or a stage (stratigraphy), stage in the stratigraphic column. It is a subdivision of the Early Cretaceous, Early or Lower Cretaceous epoch (geology), Epoch or series (stratigraphy), S ...

–

Cenomanian The Cenomanian is, in the International Commission on Stratigraphy's (ICS) geological timescale, the oldest or earliest age (geology), age of the Late Cretaceous epoch (geology), Epoch or the lowest stage (stratigraphy), stage of the Upper Cretace ...

boundary. The

holotype A holotype (Latin: ''holotypus'') is a single physical example (or illustration) of an organism used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of s ...

, a single, complete adult with specimen number "AMNH Bu-1464", and six of the

paratype In zoology and botany, a paratype is a specimen of an organism that helps define what the scientific name of a species and other taxon actually represents, but it is not the holotype (and in botany is also neither an isotype (biology), isotype ...

s are now deposited in the

American Museum of Natural History The American Museum of Natural History (AMNH) is a natural history museum on the Upper West Side of Manhattan in New York City. Located in Theodore Roosevelt Park, across the street from Central Park, the museum complex comprises 21 interconn ...

. Four more of the paratypes are deposited in the

University of Kansas Natural History Museum The University of Kansas Natural History Museum is part of the University of Kansas Biodiversity Institute, a KU designated research center dedicated to the study of the life of the planet. The museum's galleries are in Dyche Hall on the uni ...

collections in

Lawrence, Kansas Lawrence is a city in and the county seat of Douglas County, Kansas, United States, and the sixth-largest city in the state. It is in the northeastern sector of the state, astride Interstate 70 in Kansas, Interstate 70, between the Kansas River ...

, USA. The remaining two paratype specimens are currently in a private collection, but are to be deposited in the

Field Museum of Natural History The Field Museum of Natural History (FMNH), also known as The Field Museum, is a natural history museum in Chicago, Illinois, and is one of the largest such museums in the world. The museum is popular for the size and quality of its educationa ...

, Chicago. In addition to the holotype and 12 paratypes, two other American Museum of Natural History specimens were examined as part of the study; however, they were not designated as type material.

Background

The known ''Ektatotricha'' specimens were first studied by Drs

Stylianos Chatzimanolis Stylian of Paphlagonia (Latin: ''Stylianus'', Greek: Στυλιανός), also known as Stylian the Hermit, is venerated as a saint from Adrianopolis in the province of Paphlagonia (modern Turkey). Life Stylian of Paphlagonia was born in Adri ...

of the

University of Tennessee The University of Tennessee, Knoxville (or The University of Tennessee; UT; UT Knoxville; or colloquially UTK or Tennessee) is a Public university, public Land-grant university, land-grant research university in Knoxville, Tennessee, United St ...

, Michael Engel of the

University of Kansas The University of Kansas (KU) is a public research university with its main campus in Lawrence, Kansas, United States. Two branch campuses are in the Kansas City metropolitan area on the Kansas side: the university's medical school and hospital ...

, and

Alfred Newton Alfred Newton Fellow of the Royal Society, FRS HFRSE (11 June 18297 June 1907) was an England, English zoologist and ornithologist. Newton was Professor of Comparative Anatomy at Cambridge University from 1866 to 1907. Among his numerous public ...

of the

Field Museum The Field Museum of Natural History (FMNH), also known as The Field Museum, is a natural history museum in Chicago, Illinois, and is one of the largest such museums in the world. The museum is popular for the size and quality of its educationa ...

. Chatzimanolis, Engel and Newton published the 2010

type description A species description is a formal scientific description of a newly encountered species, typically articulated through a scientific publication. Its purpose is to provide a clear description of a new species of organism and explain how it differ ...

for ''E. paradoxa'' in the journal ''

Cretaceous Research ''Cretaceous Research'' is a bimonthly peer-reviewed scientific journal published by Elsevier. The journal focuses on topics dealing with the Cretaceous period and the Cretaceous–Paleogene boundary. Abstracting and indexing The journal is abst ...

'', Volume 31. The genus name is a feminine combination of the

Greek Greek may refer to: Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group *Greek language, a branch of the Indo-European language family **Proto-Greek language, the assumed last common ancestor of all kno ...

''ektatos'', meaning "extended", which refers to the visible fifth and sixth abdominal sterna, and ''tricha'' meaning "hair". The species name ''paradoxa'' is from the Greek ''paradoxon'', meaning "riddle".

Description

The beetles are small, being between long. Their bodies are brown to reddish brown in color and have a dense covering of hairs which are notably long. Because the fifth and sixth abdominal sterna are extended, and thus visible, the genus has been placed in the

Scydmaeninae Scydmaeninae are a subfamily of small beetles, commonly called ant-like stone beetles or scydmaenines. These beetles occur worldwide, and the subfamily includes some 4,500 species in about 80 genera. Established as a family, they were reduced in ...

, supertribe Hapsomelitae. ''Ektatotricha'' differs from the other member of the supertribe, '' Hapsomela'', by having maxillary palpi which are almost equal in length, a different antenna shape, and by the depth of the punctures on the fore wings. Like ''Hapsomela'', the protibia of ''Ektatotricha'' have a well-developed hook, which may have been used in mating or male-male combat between rivals. It has also been suggested that the hooks may have been used to capture prey.

References

{{Taxonbar, from=Q5350605, from2=Q21271596

† A dagger, obelisk, or obelus is a typographical mark that usually indicates a footnote if an asterisk has already been used. The symbol is also used to indicate death (of people) or extinction (of species or languages). It is one of the mo ...

Fossil beetle genera Cretaceous insects Fossil taxa described in 2010 Cretaceous insects of Asia Burmese amber Fossils of Myanmar Monotypic prehistoric insect genera