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Gonochorism has evolved independently multiple times. [8] It is very evolutionarily stable in animals. [9] Its stability and advantages have received little attention. [10]: 46 Gonochorism owes its origin to the evolution of anisogamy, [11] but it is unclear if the evolution of anisogamy first led to hermaphroditism or gonochorism.
Bivalvia are often gonochoric, meaning they have two distinct sexes, but some are protandric hermaphrodites meaning they can change genders throughout their growth. [5] The life stage of Anomia ephippium begins at the embryonic stage post fertilization. The embryos then develop into trochophore larvae, which are described to be free-swimming.
Protogyny is the most common form of hermaphroditism in fish in nature. [30] About 75% of the 500 known sequentially hermaphroditic fish species are protogynous and often have polygynous mating systems. [31] [32] In these systems, large males use aggressive territorial defense to dominate female mating.
Thalassoma bifasciatum forages for zooplankton, mollusks, small crustaceans (such as shrimp and krill), worms, other motile invertebrates, and the eggs of smaller fish, [4] as well as ectoparasites [4] on other fish. Initial phase males eat primarily zooplankton from currents, and females and initial phase males have certain hunting times ...
Several studies have found that small male fish will look and behave like the female of their species in order to gain access to female territory and copulate with them. [5] [6] In the fish family Blenniidae, the female Salaria pavo will show a specific colour pattern and movement when they want to approach a male and copulate with him. The ...
The thermosensitive, or temperature-sensitive, period is the period during development when sex is irreversibly determined. It is used in reference to species with temperature-dependent sex determination, such as crocodilians and turtles. [12]
The pink skunk clownfish (Amphiprion perideraion), also known as the pink anemonefish, is a species of anemonefish that is widespread from northern Australia through the Malay Archipelago and Melanesia. [2]
In Spanish, nouns not belonging to the class described above form another class of noun. [1] The gender of nouns in this other class are arbitrarily assigned. However, some general patterns help to predict the gender of nouns. [11] Notably, the endings of nouns give clues to their genders. For instance, nouns ending in -o are usually masculine.