WebbBony fish are characterized by a relatively stable pattern of cranial bones, rooted, medial insertion of mandibular muscle in the lower jaw. The head and pectoral girdles are covered with large dermal bones. The eyeball is … Webb12 juni 2012 · The group gnathostomes, meaning "jaw-mouths," includes tens of thousands of living vertebrate species, ranging from fish and sharks to birds, reptiles, mammals and humans. Cartilaginous fish, which today include sharks, rays, and ratfish, diverged from the bony fishes more than 420 million years ago.
What is a sea lamprey? - National Ocean Service
WebbSharks are a type of fish that have no bones, only cartilage. Some parts of their skeleton, like their vertebrae, are calcified. Cartilage, a strong fibrous substance, is softer than bone; our nose and ears are made of cartilage. Sharks belong to the group of fishes called Elasmobranchii, which also includes the rays, skates, and ratfish. Webb9 apr. 2024 · By external fertilisation of their eggs, the majority of bony fish reproduce. During the fish spawning season, hundreds and sometimes thousands of eggs and ... species consume much of the fertilised eggs. > Option B is correct. Throughout the entire gestation cycle, viviparous sharks bear the embryos and give birth to live shark ... iron deficiency anemia in hindi
Where we split from sharks: common ancestor comes into focus
Webb28 juli 2024 · The world’s biggest fish is the whale shark, which has a maximum recorded length of 18.8 m / 61.7 ft. The second-largest fish is the basking shark, which has a maximum recorded length of 12.27 m / 40.3 ft. Unlike most sharks, which are active hunters, both the whale shark and the basking shark are filter feeders. WebbADVERTISEMENTS: In this article we will discuss about the respiratory system of fishes. Respiratory System of Shark (Scoliodon): The respiratory organs are the gills which are borne by the gill-pouches. The structure of gill-pouches differs in different dogfishes. Figure 2.35B shows the organisation of gill-pouch of Brachaelurus, a related genus of … WebbWhile we may associate fishing with bony fish like salmon and cod, there are shark and ray (elasmobranchs) fisheries around the world. These species are directly targeted for numerous reasons. Sharks’ meat is an increasingly popular source of protein that is sold in the USA, Europe, Japan and Australia. iron deficiency anemia in the us