What are the affinities of Balanoglossus?
Affinities # Balanoglossus with Annelida:
- Vermiform body. ADVERTISEMENTS:
- Presence of coelom.
- Arrangement of blood vessels.
- Collar comparable to clitellum of Oligochaeta.
- Resemblances between Tornaria and Trochophora larva.
What are the affinities of Hemichordata?
Hemichordata shows following affinities with Annelida which was first suggested by Spengel in 1893:
- Body is vermiform and coelomate.
- Burrowing habit, tubicolous life and ingesting mud which is passes out as castings through anus.
- Collar of Balanoglossus similar to clitellum of earthworm.
What are the affinities of echinodermata?
What are the affinities of echinodermata?
- ● Affinities of echinodermata – Echinoderms show affinities with Annelida, Brachiopoda & Chordata.
- # Affinities with Annelida – Ciliated bands.
- # Affinities with Brachiopoda – Coeblastula is seen. Holoblastic cleavage.
- # Affinities with Chordata – Skeletal system mesodermal origin.
What are the characteristics of Balanoglossus?
Balanoglossus is a deuterostome, and resembles the Ascidians or sea squirts, in that it possesses branchial openings, or “gill slits”. It has notochord in the upper part of the body and has no nerve chord. It does have a stomochord, however, which is gut chord within the collar.
Is Balanoglossus a Urochordata?
Urochordata and Cephalochordata are classified under phylum Chordata. Complete Answer: Option A: Balanoglossus does not contain notochord, dorsal central nervous system, perforated pharyngeal gill slits, ventral heart, postnatal tail, and closed circulatory system in its body (main characteristics of phylum Chordata).
What is the other name of Balanoglossus?
Map to
| Mnemonic i | BALCA |
|---|---|
| Scientific name i | Balanoglossus carnosus |
| Taxonomy navigation | › Balanoglossus Terminal (leaf) node. |
| Common name i | Acorn worm |
| Synonym i | – |
Which group is notochord absent?
Notochord is absent in the group urochordata.
What kind of food is taken up Balanoglossus?
Balanoglossus is a “ciliary feeder”. Its food comprises microscopic organisms and minute organic particles present in water and mud or bottom sand in which it makes its burrows.
What is the habitat of Chordata?
Chordates are well represented in marine, freshwater and terrestrial habitats from the Equator to the high northern and southern latitudes. The oldest fossil chordates are of Cambrian age.
What is the reproduction of echinoderms?
Reproduction in echinoderms is typically by external fertilization; eggs and sperm are freely discharged into the water. A few sea urchins brood their eggs in special pouches, but most provide no parental care. Most echinoderms go through several planktonic larval stages before settling down.
What is meant by a Balanoglossus?
: a genus of marine burrowing wormlike animals that because of certain vertebratelike characters are not usually classed as chordates and made with certain closely related forms (such as Dolichoglossus) to constitute an order (Enteropneusta) of the Hemichorda.
Is notochord present in Urochordata?
Urochordata on the other hand is called tunicates because a tunic surrounds their body. They comprise the adult and the larval stage. In the larval stage, they possess a notochord in the tail however in the adult stage no notochord is found. Hence, the correct answer is option (C).
What do you need to know about the Balanoglossus?
In this article we will discuss about Balanoglossus:- 1. Habit and Habitat of Balanoglossus 2. External Morphology of Balanglossus 3. Body Wall 4. Coelom 5. Endoskeleton 6. Digestive System 7. Respiratory System 8. Blood Vascular System 9. Excretory System 10. Nervous System and Sense Organs 11. Reproductive System 12.
How are Hemichordata and Balanoglossus related?
The name “Hemichordata” is, however, retained for the group because it suggests that its members are related to chordates, i.e., they are “half or “part” chordates, a fact that is undisputed. Affinities of Balanoglossus (Enteropneusta, Hemichordata) with Chordates and Non-Chordate Phyla are as follows: 1. Affinities with Chordata:
How is the collar of a Balanoglossus similar to an earthworm?
1. The general body form and burrowing habit of tubicolous forms such as Balanoglossus are alike and mud is ingested in burrowing. It is passed out from the anus as castings. 2. The collar of Balanoglossus resembles with the clitellum of earthworm.
What are the affinities of Balanoglossus to chordates?
Affinities of Balanoglossus (Enteropneusta, Hemichordata) with Chordates and Non-Chordate Phyla are as follows: 1. Affinities with Chordata: Bateson (1887) included Hemichordata in phylum Chordata, since then a close relationship has been acknowledged between hemichordates and chordates.