Cyclostomata is a primitive Vertebrate belonging to the group Agnatha as they do not have jaw and their mouth is circular so they are known as Cyclostomes. Present-day Lamprey and Hagfish we see are placed under the class Cyclostomata, before Cyclostomata we have no living evidence for primitive Vertebrate, one group Ostracoderms also considered as … Read more
Lamprey and Hagfish are two groups of class Cyclostomata, both have some common features as well as vast differences. Phylogenetically Lamprey and Hagfish evolved from two different ancestral stock so there are many striking differences present between them, based on the dissimilarity they are placed into two different order underclass Cyclostomata. Lamprey belongs to the … Read more
Phylogeny of Cyclostomata: The Agnatha are the primitive members of Vertebrate and their mouths do not have jaw, this is the main feature of group Agnatha. Under Group Agnatha, two classes are present, class Ostracodermi and class Cyclostomata, Ostracoderms are extinct now but Cyclostomata presents today in the form of Lamprey and Hagfish. So Cyclostomata … Read more
The advanced features of Vertebrata present in Cyclostomata point out their ancestry of present-day Vertebrate. But some primitive and peculiar features present in Cyclostomata are very close to the features present in Cephaochordata. These affinities of Cyclostomata with the primitive non-vertebrate show that the Cyclostomata was the primitive ancestors of present-day Vertebrate, especially the Ammocoet … Read more
Cyclostomata includes jawless fish like eel-shaped animals, some important examples of class Cyclostomata will be discussed below. Petromyzon: Petromyzon is an important member of class Cyclostomata, Petromyzon lives in both marine water as well as freshwater. Petromyzon is present in almost all parts of the world, most of the countries use Petromyzon as food for … Read more
Class Cyclostomata contain fish like jawless Vertebrate with a circular mouth, lamprey and Hagfish are two groups of this class. Class Cyclostomata have around 50 species of Hagfish and lamprey, they can be classified into different subclass, orders,s, and families based on the similarities and dissimilarities among them. As the members of this class have … Read more
What is Cyclostomata: Cyclostomata are a group of animals under Group Agatha, members of Cyclostomata do not have jaws. Ostracoderms and Cyclostomata both have jawless mouths do they both are placed under Group Agnatha. The name Cyclostomata refers to the circular jawless mouth of this group of animals, lamprey and Hagfish are examples of this … Read more
Basis Overview of Petromyzon: The most primitive Vertebrate are the jawless Vertebrate or Agnatha, both Ostracoderms and Cyclostomata belong to the group Agnatha. But Ostracoderms are extinct now so the Cyclostomata are the examples of living primitive Vertebrate. Petromyzon is jawless fish-like animals that live in both freshwater as well as marine water, the lamprey … Read more
Petromyzon is a fish-like aquatic animal, they spend most of the time in marine water but at a certain phase of time, they migrate in freshwater for reproduction. In the perspective of economic importance, the lamprey has a specific role in the food chain. In economics, the lamprey has both positive impacts as well as … Read more
Development in Petromyzon is indirect, their life cycle involves a certain larval stage after metamorphosis the larva convert into adult Petromyzon. Petromyzon is dioecious, male and female release gametes, in water fertilization occur externally. The female Petromyzon releases a large number of telolecithal eggs, but the eggs have a large quantity of yolk. Then the … Read more
