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| a superclass of jawless fish in the phylum Chordata, subphylum Vertebrata. |
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| any vertebrate of the superclass Gnathostomata , having a mouth with jaws, including all vertebrates except the agnathans |
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| a subclass of Chondrichthyes or cartilaginous fish, that includes the sharks (Selachii) and the rays and skates (Batoidea). |
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| Ichthyol of or possessing a tail in which the vertebral column turns upwards and extends into the upper, usually larger, lobe, as in sharks Compare homocercal |
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| a male anatomical structure found some groups of animals, used in mating |
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| are tough scales that cover the skin of elasmobranchs (sharks and rays). |
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| the lower portion of the intestine of some sharks, rays, skates and bichirs. |
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| 2. situated more toward the cauda, or tail, than some specified reference point; toward the inferior (in humans) or posterior (in animals) end of the body. |
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| allows the detection of movement and vibrations in the water surrounding an animal, |
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| are special sensing organs called electroreceptors, forming a network of jelly-filled pores. |
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| fishes are so called because they possess lepidotrichia or "fin rays", their fins being webs of skin supported by bony or horny spines ("rays"), |
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| fishes are chordates of class Sarcopterygii. |
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| have a movable maxilla and premaxilla and corresponding modifications in the jaw musculature. |
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| Neopterygii is a group of Actinopteri animals. Neopterygii means "new fins". There are only few changes during their evolution from the earlier actinopterygians |
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| Chondrostei any member of a group of primitive ray-finned bony fishes that make up one of the three major subdivisions of the superclass Actinopterygii, |
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| are a taxonomic group of fish that have bone, as opposed to cartilaginous, skeletons |
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| a small covering or lid, and is widely used in descriptions of the animal and plant world. |
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| A membranous vascular organ that develops in female mammals during pregnancy, |
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| animals are animals that lay eggs, with little or no other embryonic development within the mother. |
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| ovovivipary, or ovivipary, is a mode of reproduction in animals in which embryos develop inside eggs that are retained within the mother's body |
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| Giving birth to living offspring that develop within the mother's body |
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| gas bladder, fish maw or air bladder is an internal gas-filled organ that contributes to the ability of a fish to control its buoyancy, |
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| can be found on gars (family Lepisosteidae) and bichirs and reedfishes |
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| shows the outer surface of four of the scales, |
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