Anachronornis is a genus of extinct bird from the Late Paleocene (Thanetian) of North America. One species has been described, Anachronornis anhimops, from the Willwood Formation in Wyoming. It is a basal anseriform, relative of modern waterfowl.[1]
Anachronornis is derived from Ancient Greek ἀναχρονισμός ("out of time") and ὄρνις ("bird"), referring to the unexpectedly late appearance of a species close to the divergence between the two major waterfowl lineages, Anhimae and Anseres. The species name anhimops, from Anhima and ὄψῐς ("face", "appearance"), refers to the appearance of the head and bill to that of the screamer genus Anhima.[1]
Descriptionedit
Anachronornis has been described as screamer-like in the literature,[2] although it shared characteristics with both screamer-line and duck-line anseriforms, placing it close to the divergence between the two groups. It had a "fowl-like" bill (non-spatulate, the basal condition in Galloanserae), instead of the spatulate bill found in ducks.[1]
Discoveryedit
The holotype, USNM 496700, was found in Park County, Wyoming as part of the Willwood Formation, preserved in a small calcereous nodule. It consists of a mostly complete skull (only missing the pterygoids), as well as assorted postcranial material.[1]
Two other fragments were found in association with the holotype in the nodule. Labelled USNM 496701 and USNM 496702, they consist respectively of a quadrate bone and a fragmentary femur, and have not been assigned to the genus or family with certainty.
Referencesedit
^ abcdHoude, Peter; Dickson, Meig; Camarena, Dakota (February 2023). "Basal Anseriformes from the Early Paleogene of North America and Europe". Diversity. 15 (2): 233. doi:10.3390/d15020233. ISSN 1424-2818.
^Dyke, G.J. (2001). "The Fossil Waterfowl (Aves: Anseriformes) from the Eocene of England". Am. Mus. Novit. 3354 (3354): 1–15. doi:10.1206/0003-0082(2001)354<0001:TFWAAF>2.0.CO;2. S2CID 55743714.
January 01, 1970
anachronornis, genus, extinct, bird, from, late, paleocene, thanetian, north, america, species, been, described, anhimops, from, willwood, formation, wyoming, basal, anseriform, relative, modern, waterfowl, temporal, range, latest, paleocene, preꞒ, scientific,. Anachronornis is a genus of extinct bird from the Late Paleocene Thanetian of North America One species has been described Anachronornis anhimops from the Willwood Formation in Wyoming It is a basal anseriform relative of modern waterfowl 1 AnachronornisTemporal range Latest Paleocene 56 2 55 8 Ma PreꞒ Ꞓ O S D C P T J K Pg N Scientific classification Domain Eukaryota Kingdom Animalia Phylum Chordata Class Aves Order Anseriformes Family AnachronornithidaeHoude Dickson amp Camarena 2023 Genus AnachronornisHoude Dickson amp Camarena 2023 Species A anhimops Binomial name Anachronornis anhimopsHoude Dickson amp Camarena 2023 Contents 1 Etymology 2 Description 3 Discovery 4 ReferencesEtymology editAnachronornis is derived from Ancient Greek ἀnaxronismos out of time and ὄrnis bird referring to the unexpectedly late appearance of a species close to the divergence between the two major waterfowl lineages Anhimae and Anseres The species name anhimops from Anhima and ὄpsῐs face appearance refers to the appearance of the head and bill to that of the screamer genus Anhima 1 Description editAnachronornis has been described as screamer like in the literature 2 although it shared characteristics with both screamer line and duck line anseriforms placing it close to the divergence between the two groups It had a fowl like bill non spatulate the basal condition in Galloanserae instead of the spatulate bill found in ducks 1 Discovery editThe holotype USNM 496700 was found in Park County Wyoming as part of the Willwood Formation preserved in a small calcereous nodule It consists of a mostly complete skull only missing the pterygoids as well as assorted postcranial material 1 Two other fragments were found in association with the holotype in the nodule Labelled USNM 496701 and USNM 496702 they consist respectively of a quadrate bone and a fragmentary femur and have not been assigned to the genus or family with certainty References edit a b c d Houde Peter Dickson Meig Camarena Dakota February 2023 Basal Anseriformes from the Early Paleogene of North America and Europe Diversity 15 2 233 doi 10 3390 d15020233 ISSN 1424 2818 Dyke G J 2001 The Fossil Waterfowl Aves Anseriformes from the Eocene of England Am Mus Novit 3354 3354 1 15 doi 10 1206 0003 0082 2001 354 lt 0001 TFWAAF gt 2 0 CO 2 S2CID 55743714 Retrieved from https en wikipedia org w index php title Anachronornis amp oldid 1213152348, wikipedia, wiki, book, books, library,
