Regulus bulgaricus

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Regulus bulgaricus
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Regulidae
Genus: Regulus
Species:R. bulgaricus
Binomial name
Regulus bulgaricus
Boev, 1999

Regulus bulgaricus is a fossil passerine from the Middle Villafranchian (upper Pliocene to lower Pleistocene ) of Bulgaria. This bird is a member of the kinglet family and genus, and is the only fossil kinglet found so far. It is known from a single ulna, which is 13.3 mm long. [1] The fossil was discovered in 1991 near Varshets, Bulgaria, and described by Zlatozar Boev.

Passerine Any bird of the order Passeriformes, which includes more than half of all bird species. Sometimes known as perching birds

A passerine is any bird of the order Passeriformes, which includes more than half of all bird species. Sometimes known as perching birds or – less accurately – as songbirds, passerines are distinguished from other orders of birds by the arrangement of their toes, which facilitates perching.

Villafranchian age is a period of geologic time overlapping the end of the Pliocene and the beginning of the Pleistocene used more specifically with European Land Mammal Ages. Named by Italian geologist Lorenzo Pareto for a sequence of terrestrial sediments studied near Villafranca d'Asti, a town near Turin, it succeeds the Ruscinian age.

The Pliocene Epoch is the epoch in the geologic timescale that extends from 5.333 million to 2.58 million years BP. It is the second and youngest epoch of the Neogene Period in the Cenozoic Era. The Pliocene follows the Miocene Epoch and is followed by the Pleistocene Epoch. Prior to the 2009 revision of the geologic time scale, which placed the four most recent major glaciations entirely within the Pleistocene, the Pliocene also included the Gelasian stage, which lasted from 2.588 to 1.806 million years ago, and is now included in the Pleistocene.

Contents

Taxonomy

The only known specimen of Regulus bulgaricus is a complete left ulna, 13.3 mm in length. It was collected on 20 September 1991 in a ponor near Varshets, Bulgaria. It was first described by its collector, the Bulgarian paleornithologist Zlatozar Boev. Its species name, bulgaricus, was given after the country in which the fossil was found. [1] Boev diagnosed it as an extinct species of the genus Regulus. The ulna is smaller than that of most passerines, and the shape of the articular surfaces identify it as a kinglet. It is distinguished from R. regulus by a thicker base, a longer olecranon, a larger cotyla dorsalis, and smaller quill knobs (papillae remigales caudales). Compared to R. ignicapilla , R. bulgaricus has a narrower proximal part of the diaphysis, a shorter olecranon, and smaller tuberculum retinaculi. Although Boev was unable to compare the fossil ulna with R. goodfellowi , it can be excluded from this taxonomical comparison due to it sharing a superspecies with R. regulus. [2]

Ponor

A ponor is a natural opening where surface water enters into underground passages; they may be found in karst landscapes where the geology and the geomorphology is typically dominated by porous limestone rock.

Olecranon

The olecranon from the Greekolene meaning elbow and kranon meaning head is the large, thick, curved bony eminence of the ulna, a long bone in the forearm that projects behind the elbow. It forms the most pointed portion of the elbow and is opposite to the cubital fossa or elbow pit. The olecranon serves as a lever for the extensor muscles that straighten the elbow joint.

Diaphysis

The diaphysis is the main or midsection (shaft) of a long bone. It is made up of cortical bone and usually contains bone marrow and adipose tissue (fat).

Regulus bulgaricus is the only fossil kinglet, and is possibly the ancestor of R. ignicapillus. This was speculated based on the postglacial origin of a coniferous forest belt in the Holarctic, [3] which means that its avifauna is of a more recent origin. [4]

Holarctic

The Holarctic is the name for the biogeographic realm that encompasses the majority of habitats found throughout the northern continents of the world, combining Wallace's Palearctic zoogeographical region, consisting of North Africa and all of Eurasia, and the Nearctic zoogeographical region, consisting of North America, north of Mexico. These regions are further subdivided into a variety of ecoregions. Many ecosystems, and the animal and plant communities that depend on them, are found across multiple continents in large portions of this realm. The continuity of these ecosystems results from the shared glacial history of the realm. The floristic Boreal Kingdom corresponds to the Holarctic realm.

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References

  1. 1 2 Boev (1999), p. 111
  2. Boev (1999), p. 112
  3. Boev (2002), p. 38
  4. Boev (1999), p. 113

Literature cited