trachymedusae的翻译，读音
释义：
硬水母类
n. pl. A division of acalephs in which the development
is direct from the eggs, without a hydroid stage. Some of the species
are parasitic on other medusae.
n. pl. A division of acalephs in which the development
is direct from the eggs, without a hydroid stage. Some of the species
are parasitic on other medusae.