Juncitarsus

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Juncitarsus
Temporal range: Ypresian–Lutetian
Juncitarsus merkeli 1.jpg
Fossil specimen of J. merkeli, Museo di Storia Naturale
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Phoenicopteriformes
Genus: Juncitarsus
Olson & Feduccia, 1980
Species

Juncitarsus gracillimusOlson & Feduccia, 1980
Juncitarsus merkeliPeters, 1987

Contents

Juncitarsus is an extinct genus of wading birds from the Eocene of the United States and Germany. Though previously considered a flamingo, it is likely a stem-flamingo, possibly a relative of the group which contains both flamingos and grebes (Mirandornithes).

History

A small set of bones were collected in 1946 and 1947 by Charles Lewis Gazin, Franklin L. Pearce, and George F. Sternberg at a locality in the Bridger Formation of Wyoming. These bones were sent to be studied by Alexander Wetmore, though he could not identify the species. It was not until 1980 that they were named by Storrs L. Olson and Alan Feduccia. The nominate species was named J. gracillimus with the nomenclature meaning "slender reed ankle". [1] A second species, J. merkeli from Germany was named in 1987 by Stefan Peters. [2]

Description

The remains of J. gracillimus belong to at least three adult or nearly adult birds and one chick, which at the time of death could not fly. Different sizes of bones may indicate sexual dimorphism. In the holotype (USNM 244318), the left tarsometatarsus is almost completely preserved; only a small inner part of the proximal section is missing. One right tarsus includes only the proximal section, the other - the proximal section and fragments of the head of the joint (lat. trochlea). The distal section of the right tarsus, fragments of the left tibiotarsus without a tarsus, the distal section of the right tibiotarsus, the anterior part of the left scapula, and an unfused frontal bone were preserved in a young specimen. In addition, the distal part of the right femur, fragments of the humerus and ulna, some phalanges of the fingers and vertebrae have been preserved. [1]

Based on the more completed J. merkeli (SMF A 295), the genus was a long-legged bird with a long, slender bill as seen in stilts. [2]

Classification

Olson and Feduccia had originally classified Juncitarsus as the earliest known member of the flamingo family Phoenicopteridae, though due its overall similarity to the family Recurvirostridae that authors suggested a kinship between flamingos and the avocets and stilts. This resulted in classifying flamingos as members of the shorebird order Charadriiformes. [1] However this is not currently supported by recent lines of morphological and molecular evidence as flamingos related to grebes in the clade Mirandornithes. [3] [4] [5] [6] In light of this, Juncitarsus has been considered to be a basal mirandornithean. The following phylogenetic tree depicts Mirandornithes as recovered by Torres and colleagues in 2015. [7]

Mirandornithes

Juncitarsus

Podicipediformes

Phoenicopteriformes

Palaelodidae

Phoenicopteridae

Harrisonavis

Phoenicopterus

Phoenicoparrus

Paleobiology

Juncitarsus is known from both the Bridger Formation of Wyoming and the Messel Pit of Germany dating from the Ypresian to the Lutetian stages of the Eocene epoch. Based on the available evidence, Juncitarsus was a colonial species of wading bird. [1] [2] Despite this wading lifestyle, this is actually a derived featured for this genus in respect to later mirandornitheans as it is believed this was required independently between Phoenicopteriformes and Juncitarsus. This is due the hypothesis that the common ancestor of grebes and flamingos was that of a swimming waterbird and not a wader. Furthermore Juncitarsus lacks some of the derived features that are seen in extant mirandornitheans. [6] [7]

Related Research Articles

<span class="mw-page-title-main">Charadriiformes</span> Order of birds

Charadriiformes is a diverse order of small to medium-large birds. It includes about 390 species and has members in all parts of the world. Most charadriiform birds live near water and eat invertebrates or other small animals; however, some are pelagic (seabirds), others frequent deserts, and a few are found in dense forest. Members of this group can also collectively be referred to as shorebirds.

<span class="mw-page-title-main">Gaviiformes</span> Order of birds

Gaviiformes is an order of aquatic birds containing the loons or divers and their closest extinct relatives. Modern gaviiformes are found in many parts of North America and northern Eurasia, though prehistoric species were more widespread.

<span class="mw-page-title-main">Flamingo</span> Family of birds

Flamingos or flamingoes are a type of wading bird in the family Phoenicopteridae, which is the only extant family in the order Phoenicopteriformes. There are four flamingo species distributed throughout the Americas, and two species native to Afro-Eurasia.

<span class="mw-page-title-main">Phoenicopteriformes</span> Order of birds

Phoenicopteriformes is a group of water birds which comprises flamingos and their extinct relatives. Flamingos (Phoenicopteriformes) and the closely related grebes (Podicipedidae) are contained in the parent clade Mirandornithes.

<span class="mw-page-title-main">Mousebird</span> Order of birds

The mousebirds are birds in the order Coliiformes. They are the sister group to the clade Eucavitaves, which includes the Leptosomiformes, Trogoniformes (trogons), Bucerotiformes, Piciformes and Coraciformes. This group is now confined to sub-Saharan Africa, and it is the only bird order confined entirely to that continent, with the possible exception of turacos which are considered by some as the distinct order Musophagiformes, and the cuckoo roller, which is the only member of the order Leptosomiformes, and which is found in Madagascar but not mainland Africa. Mousebirds had a wider range in the Paleogene, with a widespread distribution in Europe and North America during the Paleocene.

<i>Palaelodus</i> Extinct genus of birds

Palaelodus is an extinct genus of bird of the Palaelodidae family, distantly related to flamingos. They were slender birds with long, thin legs and a long neck resembling their modern relatives, but likely lived very different livestyles. They had straight, conical beaks not suited for filter feeding and legs showing some similarities to grebes. Their precise lifestyle is disputed, with researchers in the past suggesting they may have been divers, while more recent research suggests they may have used their stiff toes as paddles for swimming while feeding on insect larvae and snails. This behavior may have been key in later phoenicopteriforms developing filterfeeding bills. The genus includes between five to eight species and is found across Europe, Australia, New Zealand, Asia and possibly South America. However some argue that most of the taxa named from Europe simply represent differently sized individuals of one single species. Palaelodus was most abundant during the Late Oligocene to Middle Miocene periods, but isolated remains from Australia indicate that the genus, or at least a relative, survived until the Pleistocene.

<i>Osteodontornis</i> Extinct genus of birds

Osteodontornis is an extinct seabird genus. It contains a single named species, Osteodontornis orri, which was described quite exactly one century after the first species of the Pelagornithidae was. O. orri was named after then-recently deceased naturalist Ellison Orr.

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<span class="mw-page-title-main">Pelagornithidae</span> Extinct family of birds

The Pelagornithidae, commonly called pelagornithids, pseudodontorns, bony-toothed birds, false-toothed birds or pseudotooth birds, are a prehistoric family of large seabirds. Their fossil remains have been found all over the world in rocks dating between the Early Paleocene and the Pliocene-Pleistocene boundary.

<span class="mw-page-title-main">Alan Feduccia</span> American academic

John Alan Feduccia is a paleornithologist specializing in the origins and phylogeny of birds. He is S. K. Heninger Distinguished Professor Emeritus at the University of North Carolina. Feduccia's authored works include three major books, The Age of Birds, The Origin and Evolution of Birds, Riddle of the Feathered Dragons, and many peer-reviewed papers in ornithological and biological journals.

Paleontology or palaeontology is the study of prehistoric life forms on Earth through the examination of plant and animal fossils. This includes the study of body fossils, tracks (ichnites), burrows, cast-off parts, fossilised feces (coprolites), palynomorphs and chemical residues. Because humans have encountered fossils for millennia, paleontology has a long history both before and after becoming formalized as a science. This article records significant discoveries and events related to paleontology that occurred or were published in the year 1987.

Paleontology or palaeontology is the study of prehistoric life forms on Earth through the examination of plant and animal fossils. This includes the study of body fossils, tracks (ichnites), burrows, cast-off parts, fossilised feces (coprolites), palynomorphs and chemical residues. Because humans have encountered fossils for millennia, paleontology has a long history both before and after becoming formalized as a science. This article records significant discoveries and events related to paleontology that occurred or were published in the year 1976.

<span class="mw-page-title-main">Mirandornithes</span> Taxon of birds

Mirandornithes is a clade that consists of flamingos and grebes. Many scholars use the term Phoenicopterimorphae for the superorder containing flamingoes and grebes.

<i>Dasornis</i> Extinct genus of birds

Dasornis is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.

<span class="mw-page-title-main">Palaelodidae</span> Extinct family of birds

Palaelodidae is a family of extinct birds in the group Phoenicopteriformes, which today is represented only by the flamingos. They were widespread during the Neogene, with fossil remains found on all continents other than Antarctica. The oldest remains referred to this group appeared in the fossil record during the Oligocene in Egypt and Belgium, before palaelodids reached their peak diversity during the Miocene. Following this the group declined in the early Pliocene before going extinct on most continents. However remains found near Cooper Creek in the Lake Eyre Basin indicate that palaelodids managed to survive in Australia until the Pleistocene. Currently three genera are recognized by scientists: Adelalopus, Palaelodus and Megapaloelodus. Most fossil remains stem from Europe and have been assigned to the type species, Palaelodus ambiguus. Due to the fragmentary nature of most of these species, little is known about their ecology. They appear to have prefered brackish lakes and lagoons. Palaelodus has previously been thought to be a wader or diver, but recent research indicates that they were better suited for swimming and possibly fed on insect larvae and other aquatic invertebrates. At least Megapaloelodus appears to have adaptations for "locking" their legs in a standing position.

<span class="mw-page-title-main">Ardei</span> Suborder of birds

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Harrisonavis is an extinct genus of flamingo that lived during the Late Oligocene and Early Miocene periods in what is now France. Despite being one of the oldest known members of the flamingo family, it already shows a skull remarkably similar to that of the modern greater flamingo. Although generally similar, it subtly differs in the curvature of the bill and the size of the ventral keel of the maxilla, both signs that Harrisonavis was not yet as adapted towars filter feeding as modern species are. Harrisonavis inhabited brackish lakes alongside the more basal Palaelodidae. It contains the single species Harrisonavis croizeti, first described in 1852.

Agnopterus is an extinct genus of stem-flamingo phoenicopteriform with fossil material from France, as well as possibly England, Kazakhstan, and Brazil. The holotype specimen for type species A. laurillardi is an incomplete distal tibiotarsus from Late Eocene gypsum from Paris; a coracoid, humeri, a scapula and perhaps a proximal femur have been recovered from Late Eocene to Early Oligocene of England to a possible second species, A. hantoniensis. Two additional species from the Late Oligocene-Early Miocene have been named as well. A. turgaiensis of Kazakhstan and A. sicki of Brazil. While all four species are considered to be close to the ancestry of flamingos, their exact relationships and placement as members of Agnopterus is uncertain.

Miobaptus is a fossil genus of grebe that is known from several specimens collected from Czechia and Lake Baikal dating from the Early Miocene to Middle Miocene. Considered to be one of the most primitive genus of grebes, the anatomy of Miobaptus suggests it was less adapted for the aquatic mode of life than modern grebes, but had better flight maneuverablity.

References

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  2. 1 2 3 Peters, D. S. (1987). "Juncitarsus merkeli, n. sp. stutz die Ableitung der Flamingos von Regenpfeifervogeln (Aves: Charadriiformes: Phoenicopteridae)". Courier Forchungsinstitut Senckenberg. 97: 141–155.
  3. Mayr, G. (February 2004). "Morphological evidence for sister group relationship between flamingos (Aves: Phoenicopteridae) and grebes (Podicipedidae)". Zoological Journal of the Linnean Society. 140 (2): 157–169. doi: 10.1111/j.1096-3642.2003.00094.x .
  4. Sangster, G. (July 2005). "A name for the flamingo-grebe clade". Ibis. 147 (3): 612–615. doi:10.1111/j.1474-919x.2005.00432.x.
  5. Jarvis, E.D.; et al. (12 December 2014). "Whole-genome analyses resolve early branches in the tree of life of modern birds". Science. 346 (6215): 1320–1331. doi:10.1126/science.1253451. PMC   4405904 . PMID   25504713.
  6. 1 2 Mayr, G. (2014) The Eocene Juncitarsus – its phylogenetic position and significance for the evolution and higher-level affinities of flamingos and grebes. Comptes Rendus Palevol. 13(1):9-18. https://doi.org/10.1016/j.crpv.2013.07.005
  7. 1 2 Torres, C. R.; De Pietri, V. L.; Louchart, A.; Van Tuinen, M. (2015). "New cranial material of the earliest filter feeding flamingo Harrisonavis croizeti (Aves, Phoenicopteridae) informs the evolution of the highly specialized filter feeding apparatus" (PDF). Organisms Diversity & Evolution. 15 (3): 609–618. doi:10.1007/s13127-015-0209-7. S2CID   18198929.