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Hydra oligactis, also known as the brown hydra, is a species of hydra found widely dispersed in the northern temperate zone. It is a common organism found in still waters from early Spring to late Autumn. It is commonly found attached to the stems of water plants, the undersides of leaves, submerged twigs and on the surface of stones. When ...
Hydra (/ ˈ h aɪ d r ə / HY-drə) is a genus of small freshwater hydrozoans of the phylum Cnidaria.They are native to the temperate and tropical regions. [2] [3] The genus was named by Linnaeus in 1758 after the Hydra, which was the many-headed beast of myth defeated by Heracles, as when the animal has a part severed, it will regenerate much like the mythical hydra's heads.
Common names of fish can refer to a single species; to an entire group of species, such as a genus or family; or to multiple unrelated species or groups. Ambiguous common names are accompanied by their possible meanings. Scientific names for individual species and higher taxa are included in parentheses.
Hydra oligactis. This species can reproduce in three ways: sexual reproduction, budding, and indirectly through regeneration. [11] When hydra reproduce sexually, simple testes, ovaries, or both will develop on the bodies of an individual. Sperm released into the environment by the testes enters the egg within the ovary.
This common name is used for three different species of schooling fish with similar patterns: Hemigrammus rhodostomus, Hemigrammus bleheri, and Petitella georgiae. Splash tetra: Copella arnoldi: 5.5 cm (2.2 in) Spotted splashing tetra: Copella meinkeni: 4.5 cm (1.8 in) Pyrrhulina spilota: 7 cm (2.8 in) Serpae tetra: Hyphessobrycon serpae: 4.5 ...
Its potential as an indicator species makes it valuable to stream management. [6] It faces potential vulnerability in North Carolina, but has not faced significant decline or need for immediate management. [11] Because it is common, the spotted sunfish has been used in many studies of centrarchid fishes. It is not a common fish in aquariums.
Gorgeous pure white fish with black spots and a distinctive "hump" on the head, leading to a popular common name, "Humpback Grouper". 75 cm (29.5 in) Painted comber: Serranus scriba: No: Large fish with classic Bass body, Silvery in colour with vertical tan stripes and a blue underside. 36 cm (14.2 in) Polleni grouper: Cephalopholis polleni: No
Osteichthyes (/ ˌ ɒ s t iː ˈ ɪ k θ iː z / ost-ee-IK-theez; from Ancient Greek ὀστέον (ostéon) 'bone' and ἰχθύς (ikhthús) 'fish'), [2] also known as osteichthyans or commonly referred to as the bony fish, is a diverse superclass of vertebrate animals that have endoskeletons primarily composed of bone tissue.