Are molluscs Acoelomates?
Molluscs had a common origin with the annelids, as shown by remarkable ontogenetic similarities. Their common ancestors were non-segmented (non-eumetameric), acoelomate animals. The coelom is a phylogenetically new structure in the molluscs and annelids, and was acquired independently in the two phyla.
Are molluscs triploblastic coelomate?
Both flatworms and molluscs are triploblastic, bilaterally symmetric, and cephalized. But molluscs have developed a true coelom, an internal body cavity enclosed by mesodermal membranes. The coelom in molluscs, however, is strangely reduced to a small space around the heart, sometimes called a hemocoel.
What is the difference between a diploblastic and a triploblastic?
Diploblastic and triploblastic refer to two different types of blastula stages. The key difference between diploblastic and triploblastic animals is that diploblastic animals produce two germ layers excluding mesoderm and triploblastic animals produce all three germ layers.
Are reptiles diploblastic or triploblastic?
A vertebrate is any chrodate with a backbone. These consist of fish, birds, mammals, reptiles, and more. All vertebrates are bilaterally symmetric and triploblastic.
Is Mollusca Diploblastic or triploblastic?
Mollusca are the second largest animal phylum. They are terrestrial or aquatic. They exhibit organ-system level of organization. They are bilaterally symmetrical, triploblastic, coelomate animals.
Are Cnidaria diploblastic?
Cnidarians are generally regarded as diploblastic animals, possessing endoderm and ectoderm, but lacking mesoderm. The temporal and spatial expression of these ‘mesoderm’ genes suggests that they may play a role in germ layer specification.
Are Mollusca diploblastic or triploblastic?
What organisms are triploblastic?
Triploblasty can be seen in multicellular animals, particularly, flatworms (Phylum Platyhelminthes), mollusks (Phylum Mollusca), arthropods (Phylum Arthropoda), and chordates (Phylum Chordata). Animals that are not triploblastic are some invertebrates like sponges (Phylum Porifera) and cnidarians (Phylum Cnidaria).
Is Mollusca Acoelomate or coelomate?
Animals in the phylum Mollusca include clams, snails, octopuses, and sea slugs (pictured right). They are all protostome coelomates.
What are the characteristics of the phylum Mollusca?
Characteristic Features of Phylum Mollusca
- They are bilaterally symmetrical.
- They are triploblastic, which three layers.
- They show organ system grade of organisation.
- The body is soft and unsegmented.
- Body is divisible into three regions – head, a visceral mass, and ventral foot.
- Body is covered by a mantle and shell.
What is the difference between diploblastic and triploblast?
The key difference between diploblastic and triploblastic animals is that diploblastic animals produce two germ layers excluding mesoderm and triploblastic animals produce all three germ layers. 1. What is Diploblastic
Are sponges diploblastic or triploblastic?
Ectoderm and endoderm layers are common to both diploblastic and triploblastic animals, while mesoderm is present only in triploblastic animals. In addition to these two types, there is one group of animals called sponges, which have a single undifferentiated layer; thus, they are called monoblastic.
What is an example of a triploblastic animal?
Triploblastic: Triploblastic animals are much complex than diploblastic animals. Examples. Diploblastic: Jellyfish, comb jellies, corals and sea anemones are examples. Triploblastic: Molluscs, worms, arthropods, echinodermata and vertebrates are examples. Conclusion
Which of the following is an example of a diploblastic organism?
Cnidarians and Ctenophores are primary examples of Diploblastic animals whereas molluscs, worms, echinoderms and arthropods are Triploblastic. Many scientists feel that Diploblastic animals gave rise to Triploblastic animals millions of years ago through the process of evolution. Diploblastic organisms have two primary germ layers in the blastula.