Trochophore. 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.Just so, do arthropods have Trochophore larvae?
Until very recently, the Arthropoda (insects & crustaceans) were considered possible close relatives of the Annelida, based on the fact that both groups are segmented, but no arthropod has a trochophore larva and no molecular studies support a close relationship.
Subsequently, question is, what type of larvae do mollusks have? 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.
Besides, what animals have Trochophore larvae?
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.
Do annelids have Trochophore larvae?
Annelids are bilaterally symmetrical and do not shed their body covering. Those characteristics and features of development puts them in the Lophotrochozoan lineage, with molluscs being their most closely related phyla. For example, most have trochophore larvae.
Are humans Lophotrochozoans?
Most of the flatworms are classified in the superphylum Lophotrochozoa, which also includes the mollusks and annelids. The Platyhelminthes consist of two lineages: the Catenulida and the Rhabditophora. Many flatworms are parasitic, including important parasites of humans.What traits do all Lophotrochozoans share?
All Lophotrochozoans and Ecdysozoans share these characteristics: - bilateral symmetry.
- triploblastic embryo develops. ectoderm. endoderm. mesoderm.
- protostome characteristics.
- may be either coelomate or pseudocoelomate (depending on phylum)
- true tissues, true organs and true organ systems: integumentary system. digestive system.
What is Prototroch?
Definition of prototroch. : the ciliated band or ring characteristic of trochophore larvae.Did arthropods evolved from annelids?
Arthropods represent the evolutionary pinnacle of the protostomes. It seems likely that arthropods evolved from the same root as the annelids and that the three main lineages of arthropods - the Chelicerata, the Crustacea and the Insecta - evolved independently from a common ancestor.Are annelids ecdysozoa?
This grouping scheme is widely accepted, although some zoologists still hold to the original view that Panarthropoda should be classified with Annelida in a group called the Articulata, and that Ecdysozoa are polyphyletic. The other idea about the phylogeny of the Ecdysozoa is called the coelomate hypothesis.How do Ecdysozoans grow?
This is in part because of the limitations a mineral skeleton imposes on an animal; growth can only occur by adding more mineral to the existing skeleton, which limits the animal's form as it grows. While many ecdysozoans also maintain their basic form throughout their life, molting removes this limitation.Are annelids monophyletic?
Annelids and arthropods have long been considered each other's closest relatives, as evidenced by similarities in their segmented body plans. The resulting tree suggests that the molluscs and annelids form a monophyletic lineage and unites the molluscan taxa to a monophyletic group.Are arthropods and annelids closely related?
Arthropod relationships, both within the phylum and with other animal phyla, are uncertain. For many years arthropods and annelids were believed to be closely related, with arthropods likely evolving from annelid ancestors, or vice versa. It is possible that both groups derived from a common ancestor.What is Glochidium larva?
The glochidium (plural glochidia) is a microscopic larval stage of some freshwater mussels, aquatic bivalve mollusks in the families Unionidae and Margaritiferidae, the river mussels and European freshwater pearl mussels.Do Mollusca have Lophophores?
Trochophore larvae are distinguished from the lophophores by two bands of cilia around the body; they include the Nemertea, Mollusca, Sipuncula, and Annelida.Is porifera a Lophotrochozoa?
With the exception of the phylum Porifera (sponges), all animals have tissues that derive from embryonic germ layers. Those with two embryonic germ layers are diploblastic; those with three embryonic germ layers are triploblastic.Is a Glochidium a parasite?
The glochidium is a parasitic larval form, that develops from the fertilised egg. The fertilisation usually takes place in the female's gills, that among some mussel species may even be transformed into breeding chambers. Different mussel groups' glochidia have a different construction.Where are annelids found?
Annelids are found worldwide in all types of habitats, especially oceanic waters, fresh waters, and damp soils. Most polychaetes live in the ocean, where they either float, burrow, wander on the bottom, or live in tubes they construct; their colours range from brilliant to dull, and some species can produce light.Are earthworms ecdysozoa?
Genomic data indicate that protostomes generally contain low to moderate numbers of Toll genes. Most arthropods (insects, crustaceans, myriapods, and chelicerates, belonging to the superphylum of Ecdysozoa) and some species of mollusks and annelids (superphylum Lophotrochozoa) have between 2 and 27 Toll genes.Are the Lophotrochozoa monophyletic?
Lophotrochozoa (/l?ˌf?tro?ko?ˈzo??/, "crest/wheel animals") is a clade of protostome animals within the Spiralia. The taxon was established as a monophyletic group based on molecular evidence.What is the role of the foot in molluscs?
Mollusks have a muscular foot, which is used for locomotion and anchorage, and varies in shape and function, depending on the type of mollusk under study. In shelled mollusks, this foot is usually the same size as the opening of the shell. The foot is a retractable as well as an extendable organ.Are Lophotrochozoa Triploblastic?
As lophotrochozoans, the organisms in this superphylum possess either a lophophore or trochophore larvae. The lophotrochozoans are triploblastic and possess an embryonic mesoderm sandwiched between the ectoderm and endoderm found in the diploblastic cnidarians. 
