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Annakacygna hajimei
Taxonomy
Annakacygna hajimei was named by Matsuoka and Hasegawa (2022). Its type specimen is GMNH-PV-678, a partial skeleton (nearly complete associated but disarticulated skeleton), and it is a 3D body fossil. Its type locality is Usui River, which is in a Tortonian marine horizon in the Haraichi Formation of Japan. It is the type species of Annakacygna.
Synonymy list
Year | Name and author |
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2022 | Annakacygna hajimei Matsuoka and Hasegawa p. 3 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Annakacygna hajimei Matsuoka and Hasegawa 2022
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Diagnosis
Reference | Diagnosis | |
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H. Matsuoka and Y. Hasegawa 2022 | Large-sized anatid with a relatively big head and relatively reduced pectoral skeleton that is characterized by the combination of the following osteological features: cranium- wide fossa temporalis, presence of "pseudo-sagittal crest", presence of salt gland impression; lacrimal- unfused to the frontal of neurocranium; quadrate- deep impression of m. adductor mandibulae externus profundus on the lateral surface; mandible- curved strongly, long for the body, the longitudinal structure on the articular facet for quadrate; ribs- the uncinate process unfused; sternum- carina sterni reduced; scapula- small facies articularis humeralis and acromion, curved and wide corpus scapulae with developed and round extremitas caudalis; humerus-long and straight, as long as its trunk, short crista pectoralis, developed crista bicipitalis with prominent tubercules for the tuberculum ventrale and the insertion of m. scapulohumeralis caudalis at the middle, small distal end; ulna- short relative to the humerus, only 57% of humeral length; radius- same as ulna short relative to the humerus, widens and flattened distally; radiale- huge relative to the wing, triangular profile in dorsoventral view, acts to limit the mobile range of wrist joint to bending posture; carpometacarpus- short and robustly build, large proximal end with strong insertion of the m. ulnimetacarpalis ventralis; pelvis- wide as a swan's, distal caudal vertebrate unfused, caudal termination of pubis deep; tibiotarsus- crista cnemialis cranialis broad and squared and extend proximally and less anteriorly, condylus lateralis and condylus medialis of distal end narrow laterally, incisura intercondylaris wide; tarsometatarsus- shaft laterally narrow. All long bones are pachyostotic. |
Measurements
No measurements are available
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Source: subf = subfamily, o = order | |||||
References: Marsh 1875, Sedinger 1997 |