Hydras are acoelomates.
The hydra does in fact have a skeleton. The type of skeleton it has is a hydrostatic skeleton where a coelom, or cavity filled with fluid, is surrounded by skeletal muscles.
Yes, grasshoppers do have a coelom. This is the type of body cavity they have. There are over 10,000 known species of grasshoppers.
A coelomate animal is the one which has a body cavity in which well developed organs can be accomodated.
Some chordates have them, and in some the distinction may need to be qualified. In molluscs they remain undifferentiated, in mammals for example they differentiate into separate cavities, the pleural, peritoneal and pericardial.
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.
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A Hydra Meaning Those Three Headed Crocodile-Like Dragon?!
A true coelom is a body cavity completely lined with mesoderm tissue. It provides space for organ development, protection, and flexibility. This type of coelom allows for efficient organ function and movement within the body.
Coelom. It is partitioned by septa, which is a divider between segments of the worm.
The splanchnocoel is not a true coelom; rather, it is a type of body cavity found in certain organisms, particularly in some invertebrates like arthropods. It is derived from the embryonic mesoderm but is not entirely lined with mesodermal tissue, which is a defining characteristic of a true coelom. In contrast, a true coelom is a fully enclosed body cavity that is completely lined by mesoderm. Therefore, while the splanchnocoel serves as a body cavity, it does not meet the criteria to be classified as a true coelom.