Acanthonus armatus

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Acanthonus armatus
Drawing from the first description

Drawing from the first description

Systematics
Perch relatives (Percomorphaceae)
Order : Viscera (Ophidiiformes)
Subordination : Ophidioidei
Family : Bearded male (Ophidiidae)
Genre : Acanthonus
Type : Acanthonus armatus
Scientific name of the  genus
Acanthonus
Günther , 1878
Scientific name of the  species
Acanthonus armatus
Günther, 1878

Acanthonus armatus is a species of fish from the male bearded family(Ophidiidae) that occurs worldwide in tropical and subtropical seas between 36 ° north and 23 ° south at depths of around 1150 to 4400 meters. The species was previously found on the Carlsberg Ridge ( 6 ° 22 ′  N , 60 ° 12 ′  E ) in the north-western Indian Ocean , in the southern Indian Ocean, south of India, near New Guinea and the Philippines, in the Gulf of Mexico , in the Detected in the Caribbean , the Gulf of Panama and on the coast of West Africa.

features

The fish reach a maximum length of 37.5 cm and have the typical tadpole-like shape of most bearded men with a large, broad head, a laterally flattened short body and an increasingly tapering tail that tapers at the end. At the end of the snout there is a conspicuous two-pointed stinger. The mouth is deep and wide. In the upper and lower jaw as well as in the palate, the fish have brush-like teeth arranged in rows. On the gill cover are conspicuous long spines that reach back over the head end. There are more spines at the lower angle of the preoperculum . The small eyes are closer to the tip of the snout than to the rear edge of the gill cover. The anterior gill arch carries 16 to 22 stiff and leaf-shaped gill rakes . There is no goatee . The skull bones are soft. Acanthonus armatus has the smallest brain relative to body size among all the real bony fish (Teleostei) examined . The pectoral fins are supported by 16 to 19 fin rays. The pelvic fins are close together and are reduced to two filamentous fin rays. A caudal fin is missing. The scales of Acanthonus armatus are extremely small.

Way of life

Acanthonus armatus lives pelagic in the bathyal and in the abyssal near the seabed. The species is quite common and reproduces oviparously . The oval eggs floating freely in the water are embedded together in a gelatinous mass.

Individual evidence

  1. ^ A b Günther, Albert: The Annals and magazine of natural history; zoology, botany, and geology Preliminary notices of deep-sea fishes collected during the voyage of the HMS "Challenger". 1878, pp. 22-23 , accessed February 14, 2019 .
  2. ↑ a b c Acanthonus armatus on Fishbase.org (English)
  3. ↑ Jørgen G. Nielsen: FAO SPECIES CATALOG, Volume 18. Ophidiiform fishes of the world (Order Ophidiiformes). An annotated and illustrated catalog of pearlfishes, cusk-eels, brotulas and other ophidiiform fishes known to date. FAO , Rome 1999, ISBN 92-5-104375-2 , pages 50-51.

Web links