How does chordata reproduce

Example: Ascidia mentula. Example: Doliolum denticulatum. Example: Oikopleura longicaudata. Sub-phulum: Cephalochordata Acraniata. They are Fish-like marine animals with laterally fattened body devoid of paired fins, skull and limbs. The notochord is found throughout life which extends forward to the anterior end of the snout, in front of the nerve cord. Pharynx large, sac-like and perforated with numerous well-developed pharyngeal gill slits. Ciliated nephridia serve as the excretory organs, U shaped with solenocytes.

Bracnchiostoma lanceolatum. Sub-phylum: Vertebrata Craniata. Characteristics of sub phylum Vertebrata. Presence of cranium or brain-box accompanied with a vertebral column; the vertebral column is composed of segmented cartilaginous or bony rings, known as vertebra.

The neural tube is specialized to form the complex brain; the brain is associated with special sense organs. Presence of visceral arches which are variously modified in different groups vertebrates. Circulatory system consisting of a ventral thoracic heart and shows increasing structural complexities in keeping the oxygenated blood separate. They have long, rounded and eel-like body with scale less, glandular and smooth skin.

Petromynus marinus Lamprey. Some species have electric organs such as Torpedo and some bear poisonous sting such as Trygon. They posses both paired and median fins which are not supported by fin rays.

Sexes are separate and in male, pelvic fin is provided with a pair of claspers. Gonads are typically paired and provided with ducts that open into the cloaca. Fertilization is internal, development is direct; many of them are viviparous which give birth to young baby.

Pristis clavata. They inhabit in all sort of waters such as fresh, marine, brackish-water environment. They have bony endoskeleton. In this case, at the embryonic stage, endoskeleton is cartilaginous but it is replaced by bones in the adult stage. The body skin is covered by different types of scales such as ctenoid, cycloid or ganoid scales, which are dermal in origin. They have sac-like outgrowth which is known as swim bladder or air bladder. It is air filled organ arising from the dorsal wall of the oesophagus.

It helps to maintain buoyancy and in some fishes such as catfish, it helps in respiration. Lateral line system is well-developed which stars from the end of the operculum and ends at the base of the caudal fin. They have well developed renal portal system with mesonephric kidneys. During excretion, they release chiefly nitrogenous waste. They have 2-chambered heart, one auricle and one ventricle with sinus venosus and conus arteriosus.

But in the lung fishes, the heart is three chambered with two auricles and one ventricle. They are mostly egg laying fish oviparous , some are ovoviviparous and their development is direct. In few cases, development is indirect with a larva, known as leptocephalus such as Anguila. The class Osteichthyes is divided into the following two subclasses:. Subclass Actinopterygii. Fin rays are attached directly to the proximal or basal skeletal elements, known as the radials.

The skin of the body is covered by scales like cycloid, ctenoid or ganoid. In some fishes such as silurids, scales are absent. Labeo rohita. Subclass Sarcopterygii. They are also known as fleshy finned or lobe-finned fish due to their lobed appearance fins.

Thick, pitted rhomboidal shaped ganoid scales are present on the body with cosmoid layer characteristics. Heterocercal type caudal fin is found in the primitive species but diphycercal type caudal fin is present in the recent forms.

They perform respiration through lungs. In this case, swim bladder is replaced into lungs. Basal element of pectoral fins is attached to the girdle with a branching arrangement at the tip.

Internal nares are present which opens into the buccal cavity through a pore, called choanae. Vertebral column continues up to the tail end which divides the tail into upper and lowers lobes. Latimeria chalumnae. General Characteristics of Class Amphibia. The body is divided into two regions such as head and trunk. In some cases, the tail may be present. They reproduce Asexually. Both; most reproduce sexually, but some species reproduce asexually. No they sexually reproduce.

Teacup pigs reproduce sexually. All animals reproduce sexually. Only plants have the ability to reproduce asexually. They reproduce asexually. Most protozoan species can reproduce both asexually and sexually!!!

Depending on the type of protista, they reproduce either sexually or asexually. Angiosperms reproduce sexually by means of flowers and asexually by apomixis. Animals reproduce sexually. Only flowers reproduce asexually, as well as bacteria.. Worms reproduce sexually. Rattlesnakes reproduce sexually. Octopuses reproduce sexually. Log in. See Answer. Best Answer. The dorsal hollow nerve cord is part of the chordate central nervous system. In vertebrate fishes, the pharyngeal slits become the gills.

Humans are not chordates because humans do not have a tail. Vertebrates do not have a notochord at any point in their development; instead, they have a vertebral column.

Scientific name : Chordata Chordates Chordata are a group of animals that includes vertebrates, tunicates, lancelets. Of these, the vertebrates—lampreys, mammals, birds, amphibians, reptiles, and fishes—are the most familiar and are the group to which humans belong.

Asked by: Simon Eguinoa pets fish and aquariums How many species are in Chordata? Last Updated: 19th April, Jokin Cima Professional. Do all chordates have a backbone? Living species of chordates are classified into three major subphyla: Vertebrata, Urochordata, and Cephalochordata. Vertebrates are all chordates that have a backbone.

The other two subphyla are invertebrate chordates that lack a backbone. Members of the subphylum Urochordata are tunicates also called sea squirts. Aihong Marshall Professional.

Are spiders chordates? They are all part of the phylum chordata -- I remember " chordata " by thinking of spinal chord. There are also a lot of animals without backbones. Two of the most commonly known classes in this phylum are arachnids spiders and insects. Jessika Sachleben Professional.

Who discovered Chordata? Although the name Chordata is attributed to William Bateson , it was already in prevalent use by These may be seen in early development—in some species they develop into other structures even before birth.

While some animals in the phylum Chordata are vertebrates e. The phylum Chordata contains three subphyla:. Kingdom: Animalia. Phylum: Chordata. Subphylum Vertebrata. Subphylum Tunicata formerly Urochordata. Subphylum Cephalochordata. Actively scan device characteristics for identification. Use precise geolocation data.