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n.
A sporangium or conceptacle containing only large spores; -- opposed to microsporangium. Both are found in the genera Selaginella, Isoctes, and Marsilia, plants remotely allied to ferns.
n. pl.
A comprehensive division of vertebrates, including all that have distinct jaws, in contrast with the leptocardians and marsipobranchs (Cyclostoma), which lack them.
n. pl.
The Marsipobranchiata.
n.
An eel-like marine marsipobranch (Myxine glutinosa), allied to the lamprey. It has a suctorial mouth, with labial appendages, and a single pair of gill openings. It is the type of the order Hyperotpeta. Called also hagfish, borer, slime eel, sucker, and sleepmarken.
n. pl.
One of the grand divisions of the animal kingdom, comprising all animals that have a backbone composed of bony or cartilaginous vertebrae, together with Amphioxus in which the backbone is represented by a simple undivided notochord. The Vertebrata always have a dorsal, or neural, cavity above the notochord or backbone, and a ventral, or visceral, cavity below it. The subdivisions or classes of Vertebrata are Mammalia, Aves, Reptilia, Amphibia, Pisces, Marsipobranchia, and Leptocardia.
n. pl.
A group of fishlike animals including the Marsipobranchiata and Leptocardia.
n. pl.
A class of Vertebrata, lower than fishes, characterized by their purselike gill cavities, cartilaginous skeletons, absence of limbs, and a suckerlike mouth destitute of jaws. It includes the lampreys and hagfishes. See Cyclostoma, and Lamprey. Called also Marsipobranchiata, and Marsipobranchii.
n.
A peculiar toothlike fossil of many forms, found especially in carboniferous rocks. Such fossils are supposed by some to be the teeth of marsipobranch fishes, but they are probably the jaws of annelids.
n.
A genus of marsipobranchs, including the hagfish. See Hag, 4.
n.
One of the Marsipobranchia.
n. pl.
A glass of fishes having a suckerlike mouth, without jaws, as the lamprey; the Marsipobranchii.
n. pl.
The Marsipobranchiata.
n.
An eel-like marsipobranch of the genus Petromyzon, and allied genera. The lampreys have a round, sucking mouth, without jaws, but set with numerous minute teeth, and one to three larger teeth on the palate (see Illust. of Cyclostomi). There are seven small branchial openings on each side.
n. pl.
An order of marsipobranchs, including the Myxine or hagfish and the genus Bdellostoma. They have barbels around the mouth, one tooth on the plate, and a communication between the nasal aperture and the throat. See Hagfish.
n.
An Australian name for Marsilea Drummondii, a four-leaved cryptogamous plant, sometimes used for food.
n. pl.
An order of marsipobranchs including the lampreys. The suckerlike moth contains numerous teeth; the nasal opening is in the middle of the head above, but it does not connect with the mouth. See Cyclostoma, and Lamprey.
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