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Give an example of jawless fish?

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Last updated date: 25th Jun 2024
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Answer
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Hint: Jawless fishes come under the domain of eukaryotic and are characterised by not having developed jaws in their mouth. They are a member of the Animalia subgroup and are found in marine water with very similar characteristics of vertebrates. It comes in the superclass of Agnatha and has a very different distinct mouth compared to other species.

Complete step by step answer: Example of jawless fishes is a lamprey. It comes under the cyclostomes group. Lampreys (now and then inaccurately called lamprey eels) are a historic extant lineage of jawless fish of the order Petromyzontiformes, positioned within the superclass Cyclostomata.
The adult lamprey can be characterised through a toothed, funnel-like sucking mouth. The not unusual call "lamprey" is probably derived from Latin Lampeter, which may additionally mean "stone licker"
Parasitic carnivorous species are the maximum famous and feed through uninteresting flesh of other fish to suck their blood but only 18 species of lampreys have interaction on this micro predatory way of life.
Of the 18 carnivorous species, 9 migrate from saltwater to freshwater to breed (a number of them also have freshwater populations), and nine live solely in freshwater. All non-carnivorous paperwork are freshwater species Adults of the non-carnivorous species do not feed; they stay off reserves obtained as ammocoetes (larvae), which they achieve through the filter out feeding. Adults superficially resemble eels in that they have scaleless, elongated our bodies, and can vary from thirteen to one hundred cm (five to 40 inches) in duration. Lacking paired fins, grownup lampreys have big eyes, one nostril on the top of the top, and 7 gill pores on each aspect of the head. The pharynx is subdivided; the ventral component forming a breathing tube is removed from the mouth through a valve referred to as the velum. Near the gills are the eyes, which might be poorly evolved and buried underneath pores and skin within the larvae.

Note: Common morphological traits of lampreys, such as their cartilaginous skeleton, of all dwelling, jawed vertebrates (gnathostomes), and are generally considered the most basal institution of the Vertebrata. Agnatha resembles the jawless fish group in the classification. Hagfish, which resemble lampreys, have traditionally been taken into consideration the sister taxon of the authentic vertebrates.