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Systematic Diagram of Lamprey Oral Disc. The mouth of the Lampetra genus is characterized by gaps in the bi and tricuspid lateral circumorals, missing posterior circumorals, crescent shaped infraoral lamina, tall but small longitudinal lingual lamina, curved transverse lingual lamina, and deep supraoral lamina (Diagrams of oral anatomy below).
The adult lamprey is characterized by a toothed, funnel-like sucking mouth. The common name "lamprey" is probably derived from Latin lampetra, which may mean "stone licker" (lambere "to lick" + petra "stone"), though the etymology is uncertain. [3] Lamprey is sometimes seen for the plural form. [4]
The sea lamprey has an eel-like body without paired fins. Its mouth is jawless, round and sucker-like, and as wide or wider than the head; sharp teeth are arranged in many concentric circular rows around a sharp, rasp-like tongue. There are seven branchial or gill-like openings behind the eye. Sea lampreys are olive or brown-yellow on the ...
Lethenteron appendix, the American brook lamprey, is a common non-parasitic lamprey in North America. [4] In adults their disc-like mouths contain poorly developed teeth, useless for attaching to a host.
The European river lamprey has a reproduction cycle similar to that of salmon. River lampreys migrate upstream from the sea to spawning grounds in autumn and winter. [11] [12] [13] Spawning activity is greatest in the springtime (like the brook lamprey) and after spawning, the adults die. The young larvae, known as ammocoetes, spend several ...
Lamprey mouth. Jawless fish belong to the superclass Agnatha in the phylum Chordata, subphylum ... The diagram is based on Michael Benton, 2005. ...
In larval lampreys, called ammocoetes, their mouth is not fully developed, very small, and hidden between folds of skin. Adults have a disk shaped mouth with varying amounts of teeth depending on the species. The Ohio lamprey has a single, continuous dorsal fin. Fully grown, Ohio lampreys reach 10–14 inches, but may get to 15 inches.
The mouth may be modified into a suckermouth adapted for clinging onto objects in fast-moving water. The simpler structure is found in jawless fish, in which the cranium is represented by a trough-like basket of cartilaginous elements only partially enclosing the brain and associated with the capsules for the inner ears and the single nostril.