''Macrodontopteryx'' is a
genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...
of the
prehistoric
Prehistory, also known as pre-literary history, is the period of human history between the use of the first stone tools by hominins 3.3 million years ago and the beginning of recorded history with the invention of writing systems. The use of ...
pseudotooth birds of somewhat doubtful validity. These animals were probably rather close relatives of either
pelican
Pelicans (genus ''Pelecanus'') are a genus of large water birds that make up the family Pelecanidae. They are characterized by a long beak and a large throat pouch used for catching prey and draining water from the scooped-up contents before s ...
s and
stork
Storks are large, long-legged, long-necked wading birds with long, stout bills. They belong to the family called Ciconiidae, and make up the order Ciconiiformes . Ciconiiformes previously included a number of other families, such as herons an ...
s, or of
waterfowl
Anseriformes is an order of birds also known as waterfowl that comprises about 180 living species of birds in three families: Anhimidae (three species of screamers), Anseranatidae (the magpie goose), and Anatidae, the largest family, which in ...
, and are here placed in the
order
Order, ORDER or Orders may refer to:
* Categorization, the process in which ideas and objects are recognized, differentiated, and understood
* Heterarchy, a system of organization wherein the elements have the potential to be ranked a number of d ...
Odontopterygiformes to account for this uncertainty.
Description
Only a single
species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...
, ''Macrodontopteryx oweni'', is known to date. Its remains were found in the
Ypresian
In the geologic timescale the Ypresian is the oldest age (geology), age or lowest stage (stratigraphy), stratigraphic stage of the Eocene. It spans the time between , is preceded by the Thanetian Age (part of the Paleocene) and is followed by th ...
(Early Eocene)
London Clay
The London Clay Formation is a marine geological formation of Ypresian (early Eocene Epoch, c. 56–49 million years ago) age which crops out in the southeast of England. The London Clay is well known for its fossil content. The fossils from t ...
of the
Isle of Sheppey
The Isle of Sheppey is an island off the northern coast of Kent, England, neighbouring the Thames Estuary, centred from central London. It has an area of . The island forms part of the local government district of Swale. ''Sheppey'' is derived ...
(
England
England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separated from continental Europe b ...
), where they were deposited about 50 Ma (
million years ago
The abbreviation Myr, "million years", is a unit of a quantity of (i.e. ) years, or 31.556926 teraseconds.
Usage
Myr (million years) is in common use in fields such as Earth science and cosmology. Myr is also used with Mya (million years ago). ...
) in the
Mammal Paleogene zone MP8-9. The
fossil
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...
s were at first assigned to ''Argillornis longipennis'', which is nowadays recognized as
junior synonym
The Botanical and Zoological Codes of nomenclature treat the concept of synonymy differently.
* In botanical nomenclature, a synonym is a scientific name that applies to a taxon that (now) goes by a different scientific name. For example, Linna ...
of ''
Dasornis emuinus
''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.
Alm ...
'', a larger pseudotooth bird than ''M. oweni''. Due to the scarcity of their fossil remains, is not clear whether the pseudotooth bird species described as ''
Pseudodontornis longidentata'' is not the same as ''M. oweni'', though its size suggests that it is more likely to be synonymous with ''D. emuinus''. In any case, ''Macrodontopteryx'' itself may well be no distinct genus but rather a large member of the contemporary and
sympatric
In biology, two related species or populations are considered sympatric when they exist in the same geographic area and thus frequently encounter one another. An initially interbreeding population that splits into two or more distinct species sh ...
''
Odontopteryx'', or a young or small ''Dasornis''.
The only known specimen (
BMNH A1) is an incomplete and rather crushed
skull
The skull is a bone protective cavity for the brain. The skull is composed of four types of bone i.e., cranial bones, facial bones, ear ossicles and hyoid bone. However two parts are more prominent: the cranium and the mandible. In humans, the ...
with much all of the
beak
The beak, bill, or rostrum is an external anatomical structure found mostly in birds, but also in turtles, non-avian dinosaurs and a few mammals. A beak is used for eating, preening, manipulating objects, killing prey, fighting, probing for food ...
missing. In the living animal it would have measured roughly 30–35 cm (one foot). The
wingspan
The wingspan (or just span) of a bird or an airplane is the distance from one wingtip to the other wingtip. For example, the Boeing 777–200 has a wingspan of , and a wandering albatross (''Diomedea exulans'') caught in 1965 had a wingspan of ...
was probably around .
Other supposed remains
If ''Macrodontopteryx'' is indeed a distinct genus, perhaps some pseudotooth bird fossils found in
Lutetian
The Lutetian is, in the geologic timescale, a stage or age in the Eocene. It spans the time between . The Lutetian is preceded by the Ypresian and is followed by the Bartonian. Together with the Bartonian it is sometimes referred to as the Midd ...
(
Middle Eocene,
MP11-13, about 45 Ma) deposits at
Etterbeek (
Belgium
Belgium, ; french: Belgique ; german: Belgien officially the Kingdom of Belgium, is a country in Northwestern Europe. The country is bordered by the Netherlands to the north, Germany to the east, Luxembourg to the southeast, France to th ...
) belong therein. Like the
holotype
A holotype is a single physical example (or illustration) of an organism, known to have been used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of several ...
BMNH A1, they have been assigned to ''Argillornis longipennis'' in the past; at least some of the material placed in that
taxon
In biology, a taxon (back-formation from ''taxonomy''; plural taxa) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit. Although neither is required, a taxon is usually known by a particular nam ...
at one time or another – but not its
syntype humerus
The humerus (; ) is a long bone in the arm that runs from the shoulder to the elbow. It connects the scapula and the two bones of the lower arm, the radius and ulna, and consists of three sections. The humeral upper extremity consists of a roun ...
pieces – seems too small to be of an adult ''Dasornis''.
An
Early Oligocene (
Stampian, MP21-23, about 32 Ma)
distal
Standard anatomical terms of location are used to unambiguously describe the anatomy of animals, including humans. The terms, typically derived from Latin or Greek roots, describe something in its standard anatomical position. This position pro ...
radius
In classical geometry, a radius ( : radii) of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is also their length. The name comes from the latin ''radius'', meaning ray but also the ...
from
Hamstead, Isle of Wight
: ''Hamstead should not be confused with any of the many places called Hampstead.''
Hamstead is a small rural settlement on the Isle of Wight. It is located about three miles east of Yarmouth, in the northwest of the island. According to the Po ...
(England) was also assigned to ''Macrodontopteryx''. It is without doubt from a very large and flight-capable bird, but little else can be said about it. An equally old
cervical vertebra fragment (specimen BMNH A-4413) and a
toe phalanx from nearby
Yarmouth
Yarmouth may refer to:
Places Canada
*Yarmouth County, Nova Scotia
**Yarmouth, Nova Scotia
**Municipality of the District of Yarmouth
**Yarmouth (provincial electoral district)
**Yarmouth (electoral district)
* Yarmouth Township, Ontario
*New ...
were, mainly due to their size, believed to be related to the enigmatic large flightless bird (and presumed
ratite
A ratite () is any of a diverse group of flightless, large, long-necked, and long-legged birds of the infraclass Palaeognathae. Kiwi, the exception, are much smaller and shorter-legged and are the only nocturnal extant ratites.
The systematics ...
) ''
Eleutherornis''. They were described as ''
Proceriavis martini'', but have never been compared in detail to pseudotooth bird fossils. It cannot be ruled out that ''Proceriavis'' belongs in the Pelagornithidae, but whether it would be a
junior synonym
The Botanical and Zoological Codes of nomenclature treat the concept of synonymy differently.
* In botanical nomenclature, a synonym is a scientific name that applies to a taxon that (now) goes by a different scientific name. For example, Linna ...
of ''Macrodontopteryx'' is highly uncertain given the 20-million-year difference between the Isle of Sheppey and Isle of Wight material. Recent analysis suggests that the material referred to as ''
Proceriavis'' is in fact
ratite
A ratite () is any of a diverse group of flightless, large, long-necked, and long-legged birds of the infraclass Palaeognathae. Kiwi, the exception, are much smaller and shorter-legged and are the only nocturnal extant ratites.
The systematics ...
in nature.
[Agnolin et al, Unexpected diversity of ratites (Aves, Palaeognathae) in the early Cenozoic of South America: palaeobiogeographical implications
Article in Alcheringa An Australasian Journal of Palaeontology · July 2016
DOI: 10.1080/03115518.2016.1184898]
Footnotes
References
* (2005): Osteological evidence for sister group relationship between pseudo-toothed birds (Aves: Odontopterygiformes) and waterfowls (Anseriformes). ''
Naturwissenschaften
''The Science of Nature'', formerly ''Naturwissenschaften'', is a monthly peer-reviewed scientific journal published by Springer Science+Business Media covering all aspects of the natural sciences relating to questions of biological significance. I ...
'' 92(12): 586–591.
(HTML abstract
Electronic supplement(requires subscription)
* (1989): Giant Late Eocene Marine Birds (Pelecaniformes: Pelagornithidae) from Northwestern Oregon. ''
J. Paleontol.'' 63(6): 939–944
Abstract and first page text* (2008): A skull of the giant bony-toothed bird Dasornis (Aves: Pelagornithidae) from the Lower Eocene of the Isle of Sheppey. ''
Palaeontology
Paleontology (), also spelled palaeontology or palæontology, is the scientific study of life that existed prior to, and sometimes including, the start of the Holocene epoch (roughly 11,700 years before present). It includes the study of fossi ...
'' 51(5): 1107–1116.
(HTML abstract)
* (2009): ''Paleogene Fossil Birds''. Springer-Verlag, Heidelberg & New York.
* (1996): Tertiary avian localities of the United Kingdom. ''Acta Universitatis Carolinae: Geologica'' 39: 759–771
PDF fulltext* (2002): ''Cenozoic Birds of the World, Part 1: Europe''. Ninox Press, Prague.
PDF fulltext!-- This should be treated with extreme caution as regards merging of species. Splits are usually good though. See also critical review in Auk121:623-627 here http://www.findarticles.com/p/articles/mi_qa3793/is_200404/ai_n9396879 -->
* (2009): Evolution of the Cenozoic marine avifaunas of Europe. ''Annalen des Naturhistorischen Museums Wien A'' 111: 357–37
PDF fulltext
{{Taxonbar, from=Q15261147
Pelagornithidae
Eocene birds
Fossil taxa described in 1976
Extinct birds of Europe