Property:Comment
From FANTOM5_SSTAR
The type of this property is text
0
note that we use the term 'circulatory organ' for the generic class. Taxon notes:" the ascidian tube-like heart lacks chambers....The ascidian heart is formed after metamorphosis as a simple tube-like structure with a single-layered myoepi- thelium that is continuous with a single-layered pericar- dial wall. It lacks chambers and endocardium.... The innovation of the chambered heart was a key event in vertebrate evolution, because the chambered heart generates one-way blood flow with high pressure, a critical requirement for the efficient blood supply of large-body vertebrates... all extant vertebrates have hearts with two or more chambers (Moorman and Christoffels 2003)" doi:10.1101/gad.1485706 +
Currently this class encompasses only verteberate AOs but could in theory also include cephalopod - we may want to make a more specific class for vertebrate retina. note that this class excludes ommatidial retinas, as the retina must be part of an eyeball. Us the parent class photoreceptor array / light-sensitive tissue for arthropods +
Usage notes: This class encompasses a variety of light-detecting structures from different phyla with no implication of homology, from the compound insect eye to the vertebrate camera-type eye (distinct classes are provided for each). Structure notes: Note that whilst this is classified as an organ, it is in fact more of a unit composed of different structures: in Drosophila, it includes the interommatidial bristle as a part; we consider here the vertebrate eye to include the eyeball/eye proper as a part, with the eye having as parts (when present): eyelids, conjuctiva, +
Usage notes: true necks are considered to be present when the pectoral girdle is separate from the skull - Tiktaalik is the earliest known fish to have a true neck. +
The term leg can mean: [1] an appendage on which an animal walks [2] the entire hindlimb of a tetrapod [3] the segment of a human leg between knee and ankle (cf FMA) [4] the region of a hindlimb include the stylopod and zeugopod, but excluding the autopod. We define this class as [4], and thus 'leg' is compltely analagous to 'arm'. For [1], see the class 'locomotive weight-bearing appendage'. For [2] we use 'hindlimb'. For [3] we use the less open to misinterpretation 'hindlimb zeugopod'. Editor note: currently declared as overlapping foot, as AOs disagree over whether some ankle parts are in the leg or foot +
The pons is not present in zebrafish. In this ontology we currently have some structures which are applicable to zebrafish appearing as parts of the pons. Currently we only include the weaker dubious_for_taxon relationship ubtil this is resolved +
Most male birds (e.g., roosters and turkeys) have a cloaca (also present on the female), but not a penis. Among bird species with a penis are paleognathes (tinamous and ratites), Anatidae (ducks, geese and swans), and a very few other species (such as flamingoes). A bird penis is different in structure from mammal penises, being an erectile expansion of the cloacal wall and being erected by lymph, not blood. It is usually partially feathered and in some species features spines and brush-like filaments, and in flaccid state curls up inside the cloaca[WP] +
Originally described in the dendritic cell ontology (DC_CL: 0000003)(PMID: 19243617) These cells are also CD20-negative, MHCII-positive. +
Ovaries of some kind are found in the female reproductive system of many animals that employ sexual reproduction, including invertebrates. However, they develop in a very different way in most invertebrates than they do in vertebrates, and are not truly homologous. Many of the features found in human ovaries are common to all vertebrates, including the presence of follicular cells, tunica albuginea, and so on. However, many species produce a far greater number of eggs during their lifetime than do humans, so that, in fish and amphibians, there may be hundreds, or even millions of fertile eggs present in the ovary at any given time. In these species, fresh eggs may be developing from the germinal epithelium throughout life. Corpora lutea are found only in mammals, and in some elasmobranch fish; in other species, the remnants of the follicle are quickly resorbed by the ovary. In birds, reptiles, and monotremes, the egg is relatively large, filling the follicle, and distorting the shape of the ovary at maturity. Amphibians and reptiles have no ovarian medulla; the central part of the ovary is a hollow, lymph-filled space. The ovary of teleosts is also often hollow, but in this case, the eggs are shed into the cavity, which opens into the oviduct. Although most normal female vertebrates have two ovaries, this is not the case in all species. In birds and platypuses, the right ovary never matures, so that only the left is functional. In some elasmobranchs, the reverse is true, with only the right ovary fully developing. In the primitive jawless fish, and some teleosts, there is only one ovary, formed by the fusion of the paired organs in the embryo[WP]. +
note that the more specific class fallopian tube is included, which has mammal-specific relationships +
Most animals that lay eggs, such as birds and reptiles, have an oviduct instead of a uterus. In monotremes, mammals which lay eggs and include the platypus, either the term uterus or oviduct is used to describe the same organ, but the egg does not develop a placenta within the mother and thus does not receive further nourishment after formation and fertilization. Marsupials have two uteruses, each of which connect to a lateral vagina and which both use a third, middle "vagina" which functions as the birth canal. Marsupial embryos form a choriovitelline "placenta" (which can be thought of as something between a monotreme egg and a "true" placenta), in which the egg's yolk sac supplies a large part of the embryo's nutrition but also attaches to the uterine wall and takes nutrients from the mother's bloodstream. +
Taxon notes (via vHOG): "The distal end of the oviducts differentiates as a vagina in Metatheria and Eutheria." Liem KF, Bemis WE, Walker WF, Grande L, Functional Anatomy of the Vertebrates: An Evolutionary Perspective, Third Edition (2001) Orlando Fla.: Harcourt College Publishers, p.688 +
