What type of digestion is Branchiostoma?
What type of digestion is Branchiostoma?
Digestion in Branchiostoma is both intracellular as well as extracellular. The intracellular digestion takes place inside the hepatic diverticulum while the extracellular digestion occurs inside the midgut.
What is Atrium Branchiostoma?
The atrial cavity or atrium is an extensive space lined with ectoderm. It is formed by a pair of metapleural folds one on either side above gill-slits of embryo, growing down and getting united ventrally by a transverse shelf so that a portion of the outside space becomes enclosed within the body (Fig. 6.6.).
What is absent in Branchiostoma?
So, the correct answer is ‘Head’.
What are the excretory organ in Cephalochordata?
Amphioxus belongs to the subphylum Cephalochordata. Now, the excretory organ of Amphioxus is nephridium that has the similar function as that of kidney in vertebrates. This cell is found in pared form and expels the wastes from the body cavity to the exterior.
What is the type of feeding in Branchiostoma?
Branchiostoma is a typical ciliary feeder. It feeds on planktonic micro- organism brought along with a respiratory cum food water current which constantly enters the mouth and leaves through atriopore. Digestive system consists of an alimentary canal and digestive glands.
What is the function of wheel organ in Branchiostoma?
– The task of the wheel organ is to transport dissolved particles towards the mouth. It draws food through the use of its cilia for digestion. So, the correct answer is Amphioxus.
What are the classification of amphioxus?
Cephalochordata
Lancelet/Scientific names
amphioxus, plural amphioxi, or amphioxuses, also called lancelet, any of certain members of the invertebrate subphylum Cephalochordata of the phylum Chordata. Amphioxi are small marine animals found widely in the coastal waters of the warmer parts of the world and less commonly in temperate waters.
What does the Atriopore do?
Atriopore is the opening of the lancelet where the water exists. The Branchiostoma contains the posterior opening where the water intakes. It is present in the animal at the ventral side and also the anterior position than the anus region. Atriopore is used to discharge the water substance from the body of amphioxus.
What is the phylum of Branchiostoma?
Data Quality Indicators:
| Phylum | Chordata – cordés, cordado, chordates |
| Subphylum | Cephalochordata – cephalochordates, amphioxus, lancelets, cefalocordado, anfioxo |
| Order | Amphioxiformes |
| Family | Branchiostomatidae |
| Genus | Branchiostoma Costa, 1834 |
What is the basis of classification of Protochordata?
Protochordata are divided into three most important sub-categories based on the kind of notochord they possess, namely Hemichordata, Urochordata and Cephalochordata.
What is the excretory product of liver?
Answer: the excretory product excreted by liver is Bilirubin and Biliburdin which is the brownish yellow pigment secreted by the bile of the liver ..
Which of the following is excretory product of liver?
The liver is a very important organ of excretion. The liver breaks down many substances in the blood, including toxins. The liver also excretes bilirubin — a waste product of hemoglobin catabolism — in bile. Bile then travels to the small intestine , and is eventually excreted in feces by the large intestine .
What are the excretory organs of Branchiostoma?
Food particles are entangled in the mucous layer of the pharyngeal surface, the frontal cilia help in driving the food into the oesophagus. The excretory organs of Branchiostoma consist of about 90 pairs of true nephridia and a pair of brown funnels. Some parts of the atrial wall also serve as excretory organ.
What does a Branchiostoma look like?
Branchiostoma is a small lancet-shaped creature with sharply pointed anterior and posterior ends (Fig. 1.11). The length of the animal varies from 5 to 8 cm. The body is elongated and flattened from side to side. The body is distinguishable into the body proper and definite postanal tail.
What is the generic name of Branchiostoma?
Therefore, by the rules of taxonomic priority, the name Branchiostoma is accepted as generic name and we use Amphioxus as common name. 2. Geographical Distribution of Branchiostoma: It has almost a cosmopolitan distribution and found on the sandy shores covering the tidal area to depths of many metres.
Is amphioxus the same as Branchiostoma?
Later it was discovered that O. G. Costa had christened them as Branchiostoma in 1834. Therefore, by the rules of taxonomic priority, the name Branchiostoma is accepted as generic name and we use Amphioxus as common name.
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