Do molluscs have a lophophore?
David Mack
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Lophotrochozoa: A large group that includes annelid worms, mollusks, and bryozoa, characterized in some cases by a ciliated feeding organ called a lophophore and in other cases by a ciliated larval stage called a trochophore.
What animals have a lophophore?
invertebrate animals that possess a lophophore, a fan of ciliated tentacles around the mouth. Movements of the cilia create currents of water that carry food particles toward the mouth. The lophophorates include the moss animals (phylum Bryozoa), lamp shells (phylum Brachiopoda), and phoronid worms (phylum Phoronida).
Which of the following have a lophophore?
The lophophore /ˈlɒfəfɔːr/ is a characteristic feeding organ possessed by four major groups of animals: the Brachiopoda, Bryozoa, Hyolitha, and Phoronida, which collectively constitute the protostome group Lophophorata. All lophophores are found in aquatic organisms.
Do snails have lophophore?
Mollusks are a large and diverse group of animals; familiar mollusks include snails, clams, squids, and octopuses. The Annelida are worms with thorough segmentation of the body. The phoronids, bryozoans, and brachiopods are all filter-feeders that share a ciliated feeding organ called a lophophore.
What phyla have trochophore?
Trochophores exist as a larval form within the trochozoan clade, which include the entoprocts, molluscs, annelids, echiurans, sipunculans and nemerteans. Together, these phyla make up part of the Lophotrochozoa; it is possible that trochophore larvae were present in the life cycle of the group's common ancestor.
Mollusca | Gastropods-Bivalves-Cephlapods |
Do molluscs have trochophore larvae?
trochophore, also called trochosphere, small, translucent, free-swimming larva characteristic of marine annelids and most groups of mollusks. ... In some mollusks (such as gastropods and bivalves), the trochophore develops into a second stage, the veliger (q.v.), before metamorphosing to adult form.
Do cephalopod mollusks have a trochophore stage?
Question: Do cephalopod mollusks have a trochophore stage? Yes No Depends. Some cephalopods have a trochophore stage, others do not. Select all the feature(s) that at least some representatives of the mollusk classes Polyplacophora, Gastropoda, Bivalvia, and Cephalopoda share with each other.
Are molluscs ecdysozoa?
3.01. 4.4 Mollusk Hair Cells. Thus far we have discussed nonchordate mechanoreceptors in cnidarians, a basal metazoan, and in nematodes and insects, both examples of Ecdysozoa (moulting animals). ... Mollusks are the largest group in this taxon and are also the most diverse.
Does a clam have a lophophore?
Clams are mollusks and their shells are very different if you look closely. Each valve (shell) of a clam looks just like the other half. ... Mollusks do not have a lophophore.
Are molluscs Lophotrochozoa?
Molluscs are protostomes belonging to the Lophotrochozoa superphylum and are the second most diverse animal phylum, after arthropoda, regrouping about 93 000 species.
Are crustaceans Ecdysozoans?
Ecdysozoa (/ˌɛkdɪsoʊˈzoʊə/) is a group of protostome animals, including Arthropoda (insects, chelicerata, crustaceans, and myriapods), Nematoda, and several smaller phyla. ... The group is also supported by morphological characters, and includes all animals that grow by ecdysis, moulting their exoskeleton.
What qualifies an animal as a Lophophorate?
lophophorate, any of three phyla of aquatic invertebrate animals that possess a lophophore, a fan of ciliated tentacles around the mouth. Movements of the cilia create currents of water that carry food particles toward the mouth.
What is the function of the lophophore?
The lophophore is a specialized part of the mesosome, which bears tentacles that are covered with numerous cilia. The lophophore performs several main functions including the collecting of food particles, the brooding of embryos, and respiration.
What do Lophophorates have in common?
Members of lophophorate phyla possess a true coelom, a body cavity lined with a layer of mesodermal epithelium called peritoneum. They belong to the protostome branch of the bilateral animals, but they have some characteristics typical of deuterostomes.
What is a lophophore quizlet?
Lophophore. Crown of tentacles covered with cilia that is borne on a ridge or fold of the body wall; efficient feeding device; inside is part of the coelom. Phyla That Possess Lophophore.
What is a lophophore and what is it used for?
lophophore An organ characteristic of aquatic invertebrates of the phyla Bryozoa, Phoronida, and Brachiopoda that functions in filter feeding. It consists of a ridge of hollow tentacles bearing cilia, which waft food particles into the mouth.
Is a lophophore analogous?
A comparative analysis of morphological data showed that in all lophophorates lophophoral nervous systems includes homologous (having one ancestor) nerves. Thus, the lophophore is a homologous structure, which was inherited by all lophophorates from the last common ancestor.
Is ecdysozoa a cnidaria?
Lophotrochozoa and Ecdysozoa are both Bilataria. Acoela and Cnidaria both possess radial symmetry. Arthropods are more closely related to nematodes than they are to annelids.
What are the differences between Lophotrochozoa and ecdysozoa?
What is the difference between Lophotrochozoa and Ecdysozoa? Ecdysozoans have the ability to shed their exoskeleton several times throughout their life span, whereas lophotrochozoan are the animals who possess a trochophore larvae and a feeding structure called lophophore.
What is the key characteristic of the ecdysozoa?
The most distinguishing and prominent feature of Ecdysozoans is their cuticle: a tough, but flexible exoskeleton that protects these animals from water loss, predators, and other aspects of the external environment. All members of this superphylum periodically molt or shed their cuticle as they grow.
Do molluscs have a larval stage?
Unlike echinoderms, molluscs do not have a larval body separate from the juvenile/adult body; mollus- can larvae have only transient larval traits.
Which characteristic do all mollusks have?
WHAT FEATURES DO MOLLUSKS HAVE IN COMMON? As well as a shell, most mollusks have a muscular foot for creeping or burrowing. Some also have a head with sense organs. The soft body includes lungs or gills for breathing, and digestive and reproductive parts, all enclosed by a skinlike organ called the mantle.
What are the characteristics 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 larva of Mollusca?
veliger, larva typical of certain mollusks such as marine snails and bivalves and a few freshwater bivalves. The veliger develops from the trochophore (q.v.) larva and has large, ciliated lobes (velum). The velum forms from the ciliary ring (prototroch), a characteristic of the trochophore stage.
Do cnidarians have trochophore larvae?
These clades are upheld when RNA sequences are compared. Trochophore larvae are characterized by two bands of cilia around the body. The lophotrochozoans are triploblastic and possess an embryonic mesoderm sandwiched between the ectoderm and endoderm found in the diploblastic cnidarians.
