4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫是雌雄同的，生殖系统适于内受精。单起源的吸虫（单殖纲）大多是鱼的外生虫。

Trochus pyramis Born is of gonophores.The male reproductive system is mainly composed of the spermaries and spermaductus, instead of mating and others glands.

摘要塔形马蹄螺为雌雄异，其雄性生殖系统主要由精巢和输精管组成，没有交接器，也没有其他的附。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡是雌雄同体，殖系统适于体内受精。单起源吸（单殖纲）大多是。

Trochus pyramis Born is of gonophores.The male reproductive system is mainly composed of the spermaries and spermaductus, instead of mating and others glands.

要塔形马蹄螺为雌雄异体，其雄性殖系统主要由精巢和输精管组成，没有交接器，也没有其他附属腺体。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫是雌同的，生殖系统适于内受。源的吸虫（殖纲）大多是鱼的外生虫。

Trochus pyramis Born is of gonophores.The male reproductive system is mainly composed of the spermaries and spermaductus, instead of mating and others glands.

摘要塔形马蹄螺为雌异，性生殖系统主要由巢和输管组成，没有交接器，也没有他的附属腺。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫是雌雄同体的，生系统适于体内受精。起源的吸虫（）大多是鱼的外生虫。

Trochus pyramis Born is of gonophores.The male reproductive system is mainly composed of the spermaries and spermaductus, instead of mating and others glands.

摘要塔形为雌雄异体，其雄性生系统主要由精巢和输精管组成，没有交接器，也没有其他的附属腺体。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡是雌雄同体的，生系统适于体内受精。起源的吸（纲）大多是鱼的外生。

Trochus pyramis Born is of gonophores.The male reproductive system is mainly composed of the spermaries and spermaductus, instead of mating and others glands.

摘要塔形马雌雄异体，其雄性生系统主要由精巢和输精管组成，没有交接器，也没有其他的附属腺体。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫是雌雄，生殖系统适于内受精。单起源吸虫（单殖纲）大多是鱼外生虫。

Trochus pyramis Born is of gonophores.The male reproductive system is mainly composed of the spermaries and spermaductus, instead of mating and others glands.

摘要塔形马蹄螺为雌雄异，其雄性生殖系统主要由精精管组成，没有交接器，也没有其他附属腺。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫雌雄同体的，生殖系统适于体内受精。单起源的吸虫（单殖纲）鱼的外生虫。

Trochus pyramis Born is of gonophores.The male reproductive system is mainly composed of the spermaries and spermaductus, instead of mating and others glands.

摘马蹄螺为雌雄异体，其雄性生殖系统主由精巢和输精管组成，没有交接器，也没有其他的附属腺体。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫是雌雄同体的，生殖体内受精。单起源的吸虫（单殖纲）大多是鱼的外生虫。

Trochus pyramis Born is of gonophores.The male reproductive system is mainly composed of the spermaries and spermaductus, instead of mating and others glands.

摘要塔形马蹄螺为雌雄异体，其雄性生殖要由精巢和输精管组成，没有交接器，也没有其他的附属腺体。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫是雌雄同体，系统适于体内受。单起源吸虫（单纲）大多是鱼外虫。

Trochus pyramis Born is of gonophores.The male reproductive system is mainly composed of the spermaries and spermaductus, instead of mating and others glands.

摘要塔形马蹄螺为雌雄异体，其雄性系统主要和输管组成，没有交接器，也没有其他附属腺体。