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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.
Pristipomoides multidens has a wide Indo-Pacific distribution. It occurs along the eastern African coast in Tanzania, Mozambique and South Africa, in the Red Sea and across the Indian Ocean, excluding the Arabian Sea into the Pacific where its range extends east as far as Samoa, north to Japan and south to Australia. [1]
The mechanisms of reproductive isolation are a collection of evolutionary mechanisms, behaviors and physiological processes critical for speciation.They prevent members of different species from producing offspring, or ensure that any offspring are sterile.
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)
Ombilinichthys yamini is the oldest known gourami. The family Osphronemidae is divided into the following subfamilies and genera: [3] [4] family Osphronemidae van der Hoeven, 1832
Many organisms, including aspen trees, reproduce by cloning, often creating large groups of organisms with the same DNA.One example depicted here is quaking aspen.. Cloning is the process of producing individual organisms with identical genomes, either by natural or artificial means.
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.
Fossil of Bothriolepis panderi, an antiarch placoderm showing its caliper-like pectoral fins: Life restoration of Coccosteus, an arthrodire placoderm : Scientific classification