Walton-on-the-Naze, Ypresian (Eocene of the United Kingdom)

Where: England, United Kingdom (51.9° N, 1.3° E: paleocoordinates 47.3° N, 1.2° W)

• coordinate estimated from map

When: Walton Member (London Clay Formation), Ypresian (56.0 - 47.8 Ma)

• early Ypresian

• formation-level stratigraphic resolution

Environment/lithology: marginal marine; phosphatic claystone

Size class: macrofossils

Primary reference: G. Mayr. 2020. A remarkably complete skeleton from the London Clay provides insights into the morphology and diversity of early Eocene zygodactyl near-passerine birds. Journal of Systematic Palaeontology 18(22):1891-1906 [M. Uhen/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 224382: authorized by Mark Uhen, entered by Mark Uhen on 24.02.2022, edited by Patricia Holroyd and Katrin Eckardt

Creative Commons license: CC BY (attribution)

Taxonomic list

  - Psittacopedidae
Psittacopes occidentalis n. sp.2 Mayr and Kitchener 2022 bird
Holotype: NMS.Z.2021.40.44: partial skeleton including several vertebrae, furcula, right scapula, left and partial right coracoids, proximal end of left humerus and distal end of right humerus, distal portion of left ulna, partial radii, both carpometacarpi, proximal end of left femur, partial right tarsometatarsus, pedal phalanges, collected in 1986 by M. Daniels
Parapsittacopes bergdahli n. gen. n. sp. Mayr 2020 bird
 Coraciiformes -
 Neornithes - Zygodactylidae
Primoscens carolinae n. sp.2 Mayr and Kitchener 2022 bird
Holotype: NMS.2021.40.54: partial skeleton including left coracoid, right scapula, fragmentary cranial portion of sternum, both humeri, left ulna, both radii, left femur, distal ends of tibiotarsi, right tarsometatarsus, a few pedal phalanges, collected in 1992 by M. Daniels
 Leptosomiformes -
Waltonavis paraleptosomus n. gen. n. sp.3 Mayr and Kitchener 2023 bird
Holotype: NMS.Z.2021.40.16: partial skeleton, including left quadrate and pterygoid, partial left scapula, left coracoid, cranial portion of sternum, left and proximal right tarsometatarsus, collected in 1988 by M. Daniels
Waltonavis danielsi n. sp.3 Mayr and Kitchener 2023 bird
Holotype: NMS.Z.2021.40.20: partial skeleton, including several vertebrae, right coracoid, partial right scapula, right humerus, proximal left humerus, right ulna, proximal and distal ends of left ulna, left carpometacarpus, both phalanges proximales digitorum majores, distal end of right femur, proximal end and fragmentary distal end of right tibiotarsus, partial left tarsometatarsus, collected in 1985 by M. Daniels
Plesiocathartes insolitipes n. sp.3 Mayr and Kitchener 2023 bird
Holotype: NMS.Z.2021.40.36: partial skeleton, including right quadrate, several vertebrae, incomplete right coracoid, cranial extremity of left scapula, partial furcula, cranial portion of sternum, proximal end of right carpometacarpus, distal right tarsometatarsus and pedal phalanges of right foot, collected in 1993 by Michael Daniels
 Psittacopasseres -
Minutornis primoscenoides n. gen. n. sp.2
Minutornis primoscenoides n. gen. n. sp.2 Mayr and Kitchener 2022 bird
Holotype: NMS.2021.40.62: left coracoid, fragmentary furcula, partial sternum, both humeri, both carpometacarpi, phalanx proximalis digiti majoris, collected in 1987 by M. Daniels
 Afroaves -
Lutavis platypelvis n. gen. n. sp.3
Lutavis platypelvis n. gen. n. sp.3 Mayr and Kitchener 2023 bird
Holotype: NMS.Z.2021.40.37: partial skeleton, including a few thoracic vertebrae and the pygostyle, substantial portions of both scapulae and coracoids, proximal and fragmentary distal end of the right humerus, proximal end of the left ulna, distal ends of both ulnae, partial carpometacarpi, carpal bones and wing phalanges, partial pelvis, right tarsometatarsus, and several pedal phalanges, collected in 1995 by Michael Daniels