Throat phallus fish
Throat phallus fish | ||||||||||||
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Neostethus lankesteri |
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Systematics | ||||||||||||
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Scientific name | ||||||||||||
Phallostethidae | ||||||||||||
Regan , 1916 |
Throat phallus fish (Phallostethidae, Syn . : Neostethidae) are a family of very small fish that live in Southeast Asia from Thailand to the Philippines and on Sumatra in fresh waters, in brackish water and rarely in the coastal seas.
features
Throat phallus fish are only 1.4 to 4.1 inches long. Your body is covered by cycloid scales, transparent, elongated and flattened on the sides. The fish usually have two dorsal fins , the first, if present, with one or two short rays, the second with 5 to 10 soft rays. Further fin formula : Anale 13–28, Pectorale 9–13
The female animals have no pelvic fins . In the males they are transformed into a throat-like copulation organ (priapium), which is used to hold the female during mating and internal fertilization. The complex priapium contains bones, muscles, outgrowths of the kidneys and gonads, as well as parts of the intestine . The males are asymmetrically built, with the priapium on one side and the anus on the other side of the body. In most species, the number of males with a left or right-sided priapium is the same, but in some one type predominates. In females, the anus is on the midline of the underside.
Throat phallus fish are ovoviviparous . The eggs have fibrous outgrowths.
Internal system
There are 21 species described in 4 genera:
- Tribe Gulaphallini
- Genus Gulaphallus Herre, 1925
- Genus Neostethus Regan, 1916
- Genus Phenacostethus Myers, 1928
- Tribus Phallostethini
- Genus Phallostethus Regan, 1913
- Phallostethus dunckeri
- Phallostethus lehi
- Phallostethus cuulong Shibukawa, Trần & Trần, 2012
- Genus Phallostethus Regan, 1913
literature
- Joseph S. Nelson : Fishes of the World. Wiley, New York 2006, ISBN 0-471-25031-7 .
Web links
- Throat phallus fish on Fishbase.org (English)