1. In Chondrichthyes, claspers are seen on - BYJU'S
Claspers of Chondrichthyes Claspers are characteristic elongations on the posterior side of pelvic fins in male members of Chondrichthyes.
In Chondrichthyes, claspers are seen on
2. In chondrichthyes, claspers are seen on - Doubtnut
Duration: 5:15Posted: Jul 21, 2023
In chondrichthyes, claspers are seen on pelvinc fins of male.
3. In chondrichthyes, claspers are seen on - Doubtnut
In chondrichthyes, claspers are seen on pelvic fins of male.
In chondrichthyes, claspers are seen on pelvic fins of male.
4. In chondrichthyes, claspers are seen on - Sarthaks eConnect
Apr 17, 2022 · In chondrichthyes, claspers are seen on A. Pelvic fins of male B. Pelvic fins of femals C. Operculum of both sexes D. Around jaws.
In chondrichthyes, claspers are seen on A. Pelvic fins of male B. Pelvic fins of femals C. Operculum of both sexes D. Around jaws.
5. In chondrichthyes, claspers are seen on - Doubtnut
Duration: 5:15Posted: May 12, 2021
Watch complete video answer for “In chondrichthyes, claspers are seen on” of Biology Class 12th. Get FREE solutions to all questions from chapter VERTEBRATA-AGNATHA AND PISCES.
6. Claspers are found on the - Infinity Learn
In Chondrichthyes (cartilaginous fishes), claspers are seen on pelvic fins of male. · Match the following genera with their respective phyla. · Which of the ...
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7. Molecular development of chondrichthyan claspers and the ...
Apr 14, 2015 · Claspers in chondrichthyans are specialized elongations on the posterior side of male pelvic fins that are used for sperm transfer during ...
The earliest known vertebrate copulatory organs are claspers, paired penis-like structures that are associated with evolution of internal fertilization and viviparity in Devonian placoderms. Today, only male chondrichthyans possess claspers, which extend from posterior pelvic fins and function as intromittent organs. Here we report that clasper development from pelvic fins of male skates is controlled by hormonal regulation of the Sonic hedgehog (Shh) pathway. We show that Shh signalling is necessary for male clasper development and is sufficient to induce clasper cartilages in females. Androgen receptor (AR) controls the male-specific pattern of Shh in pelvic fins by regulation of Hand2. We identify an androgen response element (ARE) in the Hand2 locus and present biochemical evidence that AR can directly bind the Hand2 ARE. Together, our results suggest that the genetic circuit for appendage development evolved an androgen regulatory input, which prolonged signalling activity and drove clasper skeletogenesis in male fins. Claspers are copulatory organs found in male cartilaginous fishes. Here, the authors show that androgen receptor signalling maintains the Shh pathway to promote clasper development in male skates and suggest the importance of hormonal regulation in the evolution of male copulatory organs.
8. Fish Groups – Discover Fishes - Florida Museum
Jul 14, 2020 · Claspers are located on the inner edge of the anal fins near the male's cloaca. The function of claspers is to introduce sperm into a female ...
Water covers over three-quarters of the earth's surface. Fish live in this world of water and are the most numerous of the vertebrates, or animals with backbones. There are three major groups of living fish. Superclass Agnatha The first group is the Superclass Agnatha. This group is the most pri
9. Determine if the following statement about vertebrae is true or false
The pelvic fins present in the males of Chondrichthyes extend to form structures known as claspers. These structures help the males during the process of ...
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10. Eugnathostomata, Chondrichthyes, and "spiny sharks"
We have seen their putative precursors in Thelodonti and placoderm-grade gnathostomes. ... Claspers on pelvic fins as intromittant organs. Chondrichthyan ...
11. Chondrichthyan - Cartilaginous Skeleton, Gills, & Fins | Britannica
The dorsal fin and spine are erectile. Like male sharks and rays, male chimaeras have claspers that serve to transfer sperm to the female, but in addition they ...
Chondrichthyan - Cartilaginous Skeleton, Gills, & Fins: Chondrichthyans have distinguishing features like a cartilaginous skeleton, five to seven fully developed gill clefts, and sense organs in the lateral line system that help locate vibrations of low frequencies, temperature, salinity, and minute electrical stimuli. Marine cartilaginous fishes have an ability termed urea retention habitus.
12. Cartilaginous Fishes | Encyclopedia.com
Cartilaginous fish are also known as Chondrichthyes and have one or two dorsal fins, a caudal fin, an anal fin, and ventral fins which are supported by girdles ...
Chondrichthyes The class Chondrichthyes consists of the cartilaginous fishes, including sharks, batoids (rays, skates, guitarfish, and sawfishes), and chimaeras, or ratfishes.
13. Behaviour of cartilaginous fish - biodiversity explorer
Male rays may copulate from above or below the female while swimming, or when resting on the bottom. Male chimaeras use their head and prepelvic claspers to ...
Chondrichthyes (cartilaginous fish, including sharks, rays and chaemeras) >
14. [PDF] distribution and reproductive ecology of deep-sea catsharks - ScholarWorks
Observations on population biology of the blackmouth catshark Galeus melastomus (Chondrichthyes, Scyliorhinidae) in the Ionian Sea. Cybium 17(3): 187-196. Zar, ...
15. Chondrichthyes - UCL
Chondrichthyes - cartilaginous fishes · Order Rajiformes (common rays and skates) · Order Pristiformes (Sawfish) · Order Torpediniformes (electric rays).
Vertebrata; Gnathostomata; Chondrichthyes
16. [PDF] reproductive biology of the blacktip shark, carcharhinus limbatus ...
They exhibited an unhealed scar on their ventral surface and were probably neonates, ranging between 62 and 65 cm TL. During the adult stage, the claspers were ...
FAQs
In Chondrichthyes Claspers Are Seen On? ›
Complete Answer:
Are claspers present in Chondrichthyes? ›In chondrichthyes, claspers are specialized elongations on the posterior side of male pelvic fins. They perform the function of sperm transfer during copulation.
What are pelvic claspers in Chondrichthyes? ›Male cartilaginous fish have claspers formed from the posterior portion of their pelvic fin which serve to channel semen into the female's cloaca during mating. The act of mating in some fish including sharks usually includes one of the claspers raised to allow water into the siphon through a specific orifice.
In which fish claspers are present? ›The male sharks have grooved organs that are used to deposit sperm into the genital duct of sexually receptive female sharks. These organs, called as 'claspers', are developed along the inner margin of each pelvic fin. Scoliodon is the shark and hence it possesses claspers.
Are claspers present in pelvic fins? ›- Pelvic claspers are grooved organs developed in male sharks for the purpose of copulation. They are present along the inner margin of each pelvic fin. They deposit sperm in the genital duct of receptive female sharks.
Where are shark claspers located? ›The male's sexual organ, called a “clasper” is located on the pelvic fin. Females have oviducts, a tube leading to the womb, this opening is referred to as a “cloaca”. The male will insert his clasper into the female's cloaca, releasing sperm and fertilizing her eggs.
Where are the claspers on a shark? ›Claspers are modified inner edges of the pelvic fins of male sharks and rays. During copulation, the erectile claspers are bent forward. The male inserts one clasper at a time into the female.
Is pelvic girdle present in Chondrichthyes? ›Both living osteichthyans and chondrichthyans have exclusively endoskeletal pelvic girdles [6].
Are claspers present in osteichthyes? ›Claspers are not found in Osteichthyes, claspers are found in cartilaginous fish, i.e. Chondrichthyes.
Do all cartilaginous fish have claspers? ›The males of all but the oldest fossil species have a pelvic clasper, used in courtship and mating. It is formed of the pelvic meta-pterygium - the basal cartilage of the pelvic fin.
Why are the claspers only found in male sharks? ›
Known as claspers, these two reproductive organs are only on male sharks and they act as the channel for the semen to enter the female's cloaca during mating.
Which type of fins bear claspers in cartilaginous fishes? ›Pelvic fins in males of Chondrichthyes are ones that bear claspers. In males of Chondrichthyes like rays and sharks, pelvic fins bear specialized claspers. At the time of copulation, one clasper is put into the female's cloaca.
What is pelvic fins bear claspers? ›Pelvic fins bears clasper in males of Chondrichthytes. In males of Chondrichthyes such as sharks and rays, the pelvic fins have specialized claspers. During copulation, one clasper is inserted into the female's cloaca. At this time, the sperm is pushed by the male's body through a groove into the female's body.
Do chondrichthyes have pelvic fins? ›All cartilaginous fishes have a pair each of symmetrical pectoral and pelvic fins on the sides of the body, which correspond to the forelimbs and hands or wings, and hindlimbs and feet of amphibians, reptiles, birds and mammals (tetrapods or `four-footed' land vertebrates).
What are the pelvic and pectoral fins of a fish? ›Pectoral Fin: The pectoral fin allows for abrupt changes in side-to-side direction and speed. It also acts as a brake to decrease speed while swimming. Pelvic Fin: The pelvic fin stabilizes the fish while swimming and allows for up-and-down movement in the water.
What is pelvic fin called? ›Pelvic fins are also called ventral fins and are paired. These are generally located behind the pectoral fins at the anterior end. Pectoral fins are called fish's arm and are located on each side of the body of fish.
Are claspers present in Osteichthyes? ›Claspers are not found in Osteichthyes, claspers are found in cartilaginous fish, i.e. Chondrichthyes.
What do all Chondrichthyes have in common? ›Chondrichthyes Class of vertebrate animals characterized by a cartilaginous endoskeleton, a skin covered by placoid scales, the structure of their fin rays, and the absence of a bony operculum, lungs, and swim bladder. It includes the subclasses Elasmobranchii (sharks, rays) and Holocephali (ghostfish).
What do Chondrichthyes have? ›Species in this class have paired fins, hard scales, a two-chambered heart, and a pair of nostrils. Most species have 5-7 gill slits on each side of their body. Some species produce egg cases, others give birth to live young.