Protostomes are divided into the Ecdysozoa (e.g. arthropods, nematodes) and the Spiralia (e.g. molluscs, annelids, platyhelminths, and rotifers).

Protostomia, group of animals—including the arthropods (e.g., insects, crabs), mollusks (clams, snails), annelid worms, and some other groups—classified together largely on the basis of embryological development. The mouth of the Protostomia (proto, “first”; stoma, “mouth”) develops from the first

2017年4月28日 · Protostomes are a clade of animals that undergo protostomy during their embryonic development. The protostomes, together with the Deuterostomes and the Xenacoelomorpha, make up a major group of animals called the Bilateria. These are triploblast animals that display bilateral symmetry.

What are the 2 major subgroups within protostomes? The diversification of protostomes was triggered by the transition from ________ to ______________ habitats, and the ________________ and highly modifiable body plans.

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The clade is divided into two major groups: the Lophotrochozoa and the Ecdysozoa, each with its own distinctive features and species. The term “Protostomia” comes from the Greek words “proto,” meaning first, and “stoma,” meaning mouth. This name reflects a key aspect of their development—during embryogenesis, the mouth forms before the anus.

There are two major branches of the protostomes. The ecdysozoa includes those animals that molt. Its major constituent is Arthropoda, a phylum containing insects, arachnids, mites, crustaceans, and millipedes. The second major group of protostomes are the lophotrochozoa.

2025年1月23日 · **There are two major groups of bilaterally symmetric, triploblastic animals: the protostomes and deuterostomes** *In protostomes:**-The initial pore that forms during gastrulation becomes the mouth-A coelom forms later in development from the cavities that arise within blocks of mesodermal cells

Three large subclasses of animals comprise Class Protostomia: Class Platyzoa, Class Ecdysozoa, and Class Lophotrochozoa. Only the first two classes contain organisms that infect humans. Class Platyzoa contains Class Platyhelminthes and Class Acanthocephala. Class Ecdysozoa accounts for Class Arthropoda, and Class Nematoda.

Protostomes can be divided into two major clades: Lophotrochozoa and Ecdysozoa, each with distinct characteristics and evolutionary histories. The body plans of protostomes often feature bilateral symmetry and cephalization, which is the concentration of sensory organs at …