Do all lophotrochozoans have trochophore larvae?
As lophotrochozoans, the organisms in this superphylum possess either lophophore or trochophore larvae. Previously, these were treated together as the Trochozoa, together with the arthropods, which do not produce trochophore larvae, but were considered close relatives of the annelids because they are both segmented.
What type of larvae do the lophotrochozoans have?
The name Lophotrochozoa comes from the names of the larval type of the two major animal groups included: the Lophophorata and the Trochozoa. The Trochozoa contain many worm-like forms, including the segmented worms (Phylum Annelida) but it also includes the Mollusca (snails, squid, octopods, clams, etc).
Are platyhelminthes trochophore larvae?
Phylum Platyhelminthes. The flatworms possess neither a lophophore nor trochophore larvae, although the larvae of one group of flatworms, the Polycladida (named after its many-branched digestive tract), are considered to be homologous to trochophore larvae.
Are roundworms lophotrochozoans?
Ecdysozoa include the nematodes, arthropods, onychophorans , and tardigrades, whereas lophotrochozoan include flatworms, nemerteans, mollusks, annelids, lophophorate, and rotifer.
What are the characteristics of the Lophotrochozoans?
The lophotrochozoans are triploblastic and possess an embryonic mesoderm sandwiched between the ectoderm and endoderm found in the diploblastic cnidarians. These phyla are also bilaterally symmetrical, meaning that a longitudinal section will divide them into right and left sides that are symmetrical.
Are Chordata Lophotrochozoans?
Lophotrochozoa is one of the three major clades that comprise bilateral animals, or Bilateria. The third major bilateral group is Deuterostomia, which includes hemichordates, echinoderms, and chordates (vertebrate organisms belong to this group).
Which two features are characteristic of lophotrochozoans?
The two defining characteristics of lophotrochozoans found in many members are (1) the presence of a horseshoeshaped crown of ciliated tentacles (lophophores), and (2) a minute, translucent top-shaped ciliated larvae (trochophores).
What are characteristics of lophotrochozoans?
Are flatworms lophotrochozoans?
Phylum Platyhelminthes. The flatworms are acoelomate organisms that include many free-living and parasitic forms. 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.
Which two features are characteristic of Lophotrochozoans?
Are flatworms Lophotrochozoans?
What are the key lineages of Lophotrochozoans?
Lophotrochozoa is a monophyletic group of animals that includes annelids, molluscs, bryozoans, brachiopods, platyhelminthes, and other animals that descended from the common ancestor of these organisms.
Are trochophore larvae part of the Lophotrochozoa?
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. Click to see full answer. Consequently, what is a Trochophore larva?
What is the feeding apparatus of Lophotrochozoa?
Most organisms placed in the superphylum Lophotrochozoa possess either a lophophore feeding apparatus or a trochophore larvae (thus the contracted name, “lopho-trocho-zoa”). The lophophore is a feeding structure composed of a set of ciliated tentacles surrounding the mouth.
What is the difference between Lophophora and lophotrochozoans?
As lophotrochozoans, the organisms in this superphylum possess either a lophophore or trochophore larvae. The lophophores include groups that are united by the presence of the lophophore, a set of ciliated tentacles surrounding the mouth. Lophophorata include the flatworms and several other phyla.
How did the clade Lophotrochozoa get its name?
The clade Lophotrochozoa is named after the two distinct characteristics of its members, the feeding structure lophophore, which is a ciliated crown of tentacles surrounding a mouth, and the developmental stage trochophore larvae. Lophophorata such as Brachiozoa and Bryozoa have lophophores,…