Physoclistiとは 意味・読み方・使い方

Physoclisti are fishes that lack a connection between the gas bladder and the alimentary canal.
Addition and removal of the gasses from the gas bladder in these fishes occurs through specialised structures called the gas gland and ovale respectively.
The pneumatic duct that connects the gut and gas bladder is present in the embryos of these fish but it is lost during development.This anatomical state is believed to be derived from the ancestral physostomous state.
Some fishes like eels are anatomically physostomous, but their gas bladders function similar to those of physoclists.