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| 1.A person or animal having both male and female sex organs or other sexual characteristics, either abnormally or (in the case of some organisms) as the natural condition |
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| 1.The action or process of fertilizing an egg, female animal, or plant, involving the fusion of male and female gametes to form a zygote |
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| 3.Cell division, esp. of a fertilized egg cell |
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| 1.An animal embryo at the early stage of development when it is a hollow ball of cells |
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| (gastrula) double-walled stage of the embryo resulting from invagination of the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endoderm |
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| 1.The rudimentary alimentary cavity of an embryo at the gastrula stage |
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| 1.The opening of the central cavity of an embryo in the early stage of development |
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| 1.A multicellular organism whose mouth develops from a primary embryonic opening, such as an annelid, mollusk, or arthropod |
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| Deuterostomes (taxonomic term: Deuterostomia; from the Greek: "second mouth") are a superphylum of animals. They are a subtaxon of the Bilateria branch of the subregnum Eumetazoa, and are opposed to the protostomes |
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| 1.Each of a pair of organs in the abdominal cavity of mammals, birds, and reptiles, excreting urine |
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| 1.Each of the pair of organs situated within the rib cage, consisting of elastic sacs with branching passages into which air is drawn, so that oxygen can pass into the blood and carbon dioxide be removed. Lungs are characteristic of vertebrates other than fish, though similar structures are present in some other animal groups |
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| 1.The paired respiratory organ of fishes and some amphibians, by which oxygen is extracted from water flowing over surfaces within or attached to the walls of the pharynx |
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| 1.A rigid external covering for the body in some invertebrate animals, esp. arthropods, providing both support and protection |
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| 1.A diploid cell resulting from the fusion of two haploid gametes; a fertilized ovum |
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| 1.An animal of the large phylum Chordata, comprising the vertebrates together with the sea squirts and lancelets |
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| 1.Of, on, or relating to the upper side or back of an animal, plant, or organ |
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| 1.Of, on, or relating to the underside of an animal or plant; abdominal |
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| 1.Nearer the front, esp. situated in the front of the body, or nearer to the head or forepart |
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| 1.Further back in position; of or nearer the rear or hind end, esp. of the body or a part of it |
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| 1.A cartilaginous skeletal rod supporting the body in all embryonic and some adult chordate animals |
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| 1.Symmetry around a central axis, as in a starfish or a tulip flower |
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| 1.The property of being divisible into symmetrical halves on either side of a unique plane |
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| (Pharyngeal pouch (embryology)) In the development of vertebrate animals, pharyngeal or branchial pouches form on the endodermal side between the branchial arches, and pharyngeal grooves (or clefts) form the lateral ectodermal surface of the neck region to separate the arches. |
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| 1.The active immature form of an insect, esp. one that differs greatly from the adult and forms the stage between egg and pupa, e.g., a caterpillar or grub |
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| 1.A primitive sedentary aquatic invertebrate with a soft porous body that is typically supported by a framework of fibers or calcareous or glassy spicules. Sponges draw in a current of water to extract nutrients and oxygen |
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| 1.(of an organism, e.g., a barnacle) Fixed in one place; immobile |
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| 1.A flagellated cell with a collar of protoplasm at the base of the flagellum, numbers of which line the internal chambers of sponges |
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| 1.An opening into a vessel or cavity of the body |
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| 1.A large aperture in a sponge through which water is expelled |
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| 3.A short-lived, relatively small radial jet of gas in the chromosphere or lower corona of the sun |
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| 1.(of an aquatic animal) Feeding by filtering out plankton or nutrients suspended in the water |
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| An amebocyte or amoebocyte (uh-me´-buh-sit´) is a mobile cell (moving like an amoeba) in the body of invertebrates such as echinoderms, mollusks or sponges. They move by pseudopodia. |
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| 1.A tough-coated dormant cluster of embryonic cells produced by a freshwater sponge for development in more favorable conditions |
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| 1.The action or process of regenerating or being regenerated, in particular the formation of new animal or plant tissue |
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| 1.A free-swimming sexual form of a coelenterate such as a jellyfish, typically having an umbrella-shaped body with stinging tentacles around the edge. In some species, medusae are a phase in the life cycle that alternates with a polypoid phase |
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| 1.A solitary or colonial sedentary form of a coelenterate such as a sea anemone, typically having a columnar body with the mouth uppermost surrounded by a ring of tentacles. In some species, polyps are a phase in the life cycle that alternates with a medusoid phase |
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1.The outer layer of cells covering an organism, in particular
2.The surface epithelium of the skin of an animal, overlying the dermis
3.The outer layer of tissue in a plant, except where it is replaced by periderm |
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| The gastrodermis is the inner layer of cells that lines a gastrovascular cavity of Cnidarians. |
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| Mesoglea is the translucent, inert, jelly-like substance that makes up most of the bodies of jellyfish, comb jellies and certain primitive sea creatures in the phylum Cnidaria |
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| Gastro vascular cavity, as the name indicates, functions in both digestion and the distribution of nutrients to all parts of the body. Organisms belonging to two major phyla, the Cnidaria and the Platyhelminthes, possess gastrovascular cavities. |
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| 1.A slender flexible limb or appendage in an animal, esp. around the mouth of an invertebrate, used for grasping, moving about, or bearing sense organs |
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| A cnidocyte, cnidoblast, or nematocyte is a type of venomous cell unique to the phylum Cnidaria (corals, sea anemones, hydrae, jellyfish, etc.). The cnidocyte cell provides a means for them to catch prey and defend themselves from predators. |
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| 1.A specialized cell in the tentacles of a jellyfish or other coelenterate, containing a barbed or venomous coiled thread that can be projected in self-defense or to capture prey |
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| 1.(in invertebrates such as coelenterates and flatworms) A diffuse network of neurons that conducts impulses in all directions from a point of stimulus |
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| 1.A free-swimming coelenterate larva with a flattened, ciliated, solid body |
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| Coral reefs are underwater structures made from calcium carbonate secreted by corals. Corals are colonies of tiny living animals found in marine waters containing few nutrients. Most coral reefs are built from stony corals, and are formed by polyps that live together in groups. |
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| 1.The biochemical emission of light by living organisms such as fireflies and deep-sea fishes |
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