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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]
Both neoteny and progenesis result in paedomorphism [8] (as having the form typical of children) or paedomorphosis [9] (changing towards forms typical of children), a type of heterochrony. [10] It is the retention in adults of traits previously seen only in the young.
Anatomy of an adult phoronid [1] [8] [13] Most adult phoronids are 2 to 20 cm long and about 1.5 mm wide, [8] although the largest are 50 cm long. [13] Their skins have no cuticle but secrete rigid tubes of chitin, [8] similar to the material used in arthropods' exoskeletons, [14] and sometimes reinforced with sediment particles and other ...
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 ...
Pages in category "Phaethontiformes" The following 4 pages are in this category, out of 4 total. This list may not reflect recent changes. ...
Anatids are generally herbivorous as adults, feeding on various water-plants, although some species also eat fish, molluscs, or aquatic arthropods. One group, the mergansers , are primarily piscivorous , and have serrated bills to help them catch fish.
The adults feed them with semi-digested slimy mass from their crops, and the young are fed during the first four or five months of their life. [6] The young nestlings can jump out into the water, and swim with wings and feet, in order to escape predators at nest. [6] Hoatzin embryos are known to develop very quickly compared to other birds.
Adult Lepidoptera have two pairs of membranous wings covered, usually completely, by minute scales. A wing consists of an upper and lower membrane which are connected by minute fibres and strengthened by a system of thickened hollow ribs, popularly but incorrectly referred to as "veins", as they may also contain tracheae, nerve fibres, and ...