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The Phaethontiformes / ˌ f eɪ. ɪ ˈ θ ɒ n t ɪ f ɔːr m iː z / are an order of birds. They contain one extant family, the tropicbirds (Phaethontidae), and one extinct family Prophaethontidae from the early Cenozoic. Several fossil genera have been described, with well-preserved fossils known as early as the Paleocene. [2]
Tropicbirds are a family, Phaethontidae, of tropical pelagic seabirds.They are the sole living representatives of the order Phaethontiformes.For many years they were considered part of the Pelecaniformes, but genetics indicates they are most closely related to the Eurypygiformes.
It is the smallest of three closely related seabirds of the tropical oceans and smallest member of the order Phaethontiformes. It is found in the tropical Atlantic, western Pacific and Indian Oceans. It also breeds on some Caribbean islands, and a few pairs have started nesting recently on Little Tobago, joining the red-billed tropicbird colony.
Eurypygimorphae or Phaethontimorphae is a clade of birds that contains the orders Phaethontiformes (tropicbirds) and Eurypygiformes (kagu and sunbittern) recovered by genome analysis. [2] The relationship was first identified in 2013 based on their nuclear genes. [ 3 ]
Human walking is about 75% less costly than both quadrupedal and bipedal walking in chimpanzees. Some hypotheses have supported that bipedalism increased the energetic efficiency of travel and that this was an important factor in the origin of bipedal locomotion. Humans save more energy than quadrupeds when walking but not when running.
In genetics, the phenotype (from Ancient Greek φαίνω (phaínō) 'to appear, show' and τύπος (túpos) 'mark, type') is the set of observable characteristics or traits of an organism. [ 1 ] [ 2 ] The term covers the organism's morphology (physical form and structure), its developmental processes, its biochemical and physiological ...
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A problem with this definition is that the trait in question does not fossilize, and the status of fossil forms has to be inferred from other traits. Amniotes Archaeothyris , one of the most basal synapsids, first appears in the fossil records about 306 million years ago.