No, arthropods are coelomates
C. hemocoel
Ascaris has a pseudocoelom, which is a body cavity that is partially lined by mesoderm but lacks a full peritoneal lining like a true coelom.
pseudocoelom
A pseudocoelom is a body cavity that is not fully lined with mesoderm, while a coelom is a body cavity that is fully lined with mesoderm. The coelom provides more support and protection for internal organs, while the pseudocoelom may limit organ movement and function.
The phylum Nematoda has a pseudocoelom. This type of body cavity is not completely lined by mesoderm tissue, giving it certain characteristics of a true coelom but lacking some key features.
any invertebrate animal with a three-layered body and a pseudocoel
A pseudocoelom is a partially lined body cavity found in some invertebrates and primitive vertebrates. It is located between the endoderm and the mesoderm tissue layers in these organisms.
This description matches the anatomy of a roundworm, also known as a nematode. Nematodes are unsegmented worms with a long, cylindrical body that is covered by an epidermis and cuticle. They have a fluid-filled body cavity called a pseudocoelom.
Insects have a body plan characterized by a hemocoel, which is a type of body cavity that is not a true coelom. Instead of a coelom, insects possess a pseudocoelom-like space filled with hemolymph, which is a fluid that helps in nutrient transportation and waste removal. This hemocoel is part of the open circulatory system typical of arthropods. Hence, insects do not have a true coelom or a pseudocoelom in the traditional sense.
Pseudocoelomates have a body cavity called a pseudocoelom, which is not entirely lined with mesoderm. This can restrict the movement of organs and limit the complexity of organ systems. However, the pseudocoelom still allows for the distribution of nutrients and waste products in the body.
A pseudocoelom is a type of body cavity found in some invertebrates, such as nematodes and rotifers. Unlike a true coelom, which is lined with mesodermal tissue, a pseudocoelom is not completely surrounded by mesoderm; instead, it is a fluid-filled space between the endoderm and mesoderm. This structure allows for the distribution of nutrients and waste while providing a hydrostatic skeleton, but it lacks the complexity and organization seen in organisms with a true coelom.