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Most male fish have two testes of similar size. In the case of sharks, the testes on the right side is usually larger [citation needed].The primitive jawless fish have only a single testis, located in the midline of the body, although even this forms from the fusion of paired structures in the embryo.
Bahasa Indonesia: Gambaran skematik organ reproduksi wanita, tampak depan. Bahasa Melayu : Lukisan skema organ-organ pembiakan wanita, pandangan depan. Brezhoneg : Brastres eus organoù gouennañ ar merc'hed, gwel a-dal.
Teleosts of different orders, painted by Castelnau, 1856 (left to right, top to bottom): Fistularia tabacaria (Syngnathiformes), Mylossoma duriventre (Characiformes), Mesonauta acora (Cichliformes), Corydoras splendens and Pseudacanthicus spinosus (Siluriformes), Acanthurus coeruleus (Acanthuriformes), Stegastes pictus (Incertae sedis, Pomacentridae)
Labeled anatomy of the human vulva and nearby structures. The vulva is of all of the external parts and tissues and includes the following: [3] Clitoris: an organ located at the top of the vulva.
Ejaculation occurs in two stages, the emission stage and the expulsion stage. [4] The emission stage involves the workings of several structures of the ejaculatory duct; contractions of the prostate gland, the seminal vesicles, the bulbourethral gland and the vas deferens push fluids into the prostatic urethra. [3]
Ichthyoplankton (from Greek: ἰχθύς, ikhthus, "fish"; and πλαγκτός, planktos, "drifter" [1]) are the eggs and larvae of fish. They are mostly found in the sunlit zone of the water column, less than 200 metres deep, which is sometimes called the epipelagic or photic zone.
Urechis unicinctus, known as the fat innkeeper worm or penis fish, [3] [4] is a species of marine spoon worm in East Asia.It is found in Bohai Gulf of China and off the Korean and Hokkaido coasts. [4]
The neon tetra is found in the western and northern Amazon basin in southeastern Colombia, eastern Peru, and western Brazil. [3] [4] It lives in waters with a temperature between 20 and 28 °C (68–82 °F) and pH 4–7.5.