Paakniwatavis

Paakniwatavis Temporal range: early Eocene (Ypresian), ~51.97 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Paakniwatavis holotype
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Anseriformes
Genus:	†Paakniwatavis Musser & Clarke, 2024
Species:	†P. grandei
Binomial name
†Paakniwatavis grandei Musser & Clarke, 2024

Paakniwatavis (meaning "Water Spirit bird") is a genus of extinct waterfowl from the early Eocene Green River Formation of Wyoming, United States. The genus contains a single species, P. grandei, known from a partial skeleton with a skull.

The Paakniwatavis holotype specimen, FMNH PA725, was discovered in sediments of the Green River Formation (Fossil Butte Member) near Lincoln County, Wyoming, United States. The specimen consists of a nearly complete skeleton with the skull, preserved two-dimensionally on a single slab.^[1][2]

In 2024, Musser & Clarke described Paakniwatavis grandei as a new genus and species of basal anseriform birds based on these fossil remains. The generic name, Paakniwatavis, combines a reference to the Paakniwat—the supernatural "Water Spirits" or "Water Babies" of Shoshoni legend—with the Latin word "avis", meaning "bird, referencing the presumed aquatic habitat occupied by the species.^[3] The specific name, grandei, honors researcher Lance Grande, the discoverer of the holotype specimen.^[1]

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Genera of waterfowl and their extinct allies

Kingdom: Animalia Phylum: Chordata Class: Aves Clade: Neognathae Superorder: Galloanserae
Avemetatarsalia see Avemetatarsalia Theropoda see Theropoda Maniraptora see Maniraptora Anserimorphae see below↓

Anserimorphae
Anserimorphae †Conflicto †Gastornis? †Dromornithidae? †Pelagornithidae? †Vegaviidae? †Presbyornithidae Bumbalavis Headonornis? Murgonornis Presbyornis Proherodius Telmabates Teviornis Wilaru †Anachronornithidae Anachronornis Danielsavis? Anseriformes sensu stricto †Agnopterus? †Eonessa †"Headonornis"? †Naranbulagornis †Paakniwatavis †Palaeopapia †Peioa †Petropluvialis? †Proherodius? †Wunketru Anhimae †Chaunoides Anhimidae Anhima †Chainkanas Chauna Anseres Anseranatoidea †Anatalavis? Anseranatidae Anseranas †Anserpica †Eoanseranas Anatoidea †Paranyrocidae Paranyroca Anatidae See below ↓

Anatidae
Anatidae †Aldabranas? †Allgoviachen †Ankonetta? †Awengkere †Bambolinetta? †Caerulonettion †Cayaoa? †Chelychelynechen? †Cousteauvia †Eonerornis? †Eutelornis? †Garganornis? †Helonetta? †Heteroanser? †Lavanttalornis †Loxornis? †Mioquerquedula? †Nogusunna? †Notochen †Proanser? †Protomelanitta? †Ptaiochen? †Selenonetta †Sharganetta? †Sinanas? †Tagayanetta †Talpanas? †Teleornis? †Thambetochen? †Wasonaka? †Romainvillinae Paracygnopterus Romainvillia Saintandrea Dendrocygninae Dendrocygna Thalassornis †Dendrocheninae Dendrochen Manuherikia Mionetta Stictonettinae Stictonetta Anserinae †Afrocygnus †Annakacygna Anser †Anserobranta †Asiavis †Bonibernicla Branta Cereopsis †"Chenopis" †Cnemiornis Coscoroba †Cygnavus Cygnus †Cygnopterus †Eremochen †Megalodytes †Paracygnus †Presbychen Tadorninae Alopochen †Australotadorna †Brantadorna Cairina †Centrornis Chloephaga Cyanochen Hymenolaimus †Kaikenia Merganetta †Miotadorna †Nannonetta Neochen Plectropterus †Pleistoanser Radjah Sarkidiornis Tachyeres Tadorna †Tamtamia Anatinae Aix Amazonetta †Anabernicula Asarcornis Biziura Callonetta †Chenoanas? Chenonetta †Dunstanetta †Eoneornis? †Lavadytis Lophonetta Malacorhynchus Marmaronetta Netta Nettapus †Pinpanetta Pteronetta †?Rhodonessa Salvadorina Speculanas Oxyurini Heteronetta Nomonyx Oxyura †Tirarinetta Mergini Bucephala †Camptorhynchus †Chendytes Clangula Histrionicus Lophodytes Melanitta Mergellus Mergus Polysticta †Shiriyanetta Somateria Anatini Anas Mareca †Matanas Sibirionetta Spatula Aythyini Aythya