Labeo worthingtoni

from Wikipedia, the free encyclopedia
Labeo worthingtoni
Systematics
Order : Carp-like (Cypriniformes)
Subordination : Carp fish-like (Cyprinoidei)
Family : Carp fish (Cyprinidae)
Subfamily : Labeoninae
Genre : Labeo
Type : Labeo worthingtoni
Scientific name
Labeo worthingtoni
Fowler , 1958

Labeo worthingtoni is a most likely extinct species of carp fish from the subfamily Labeoninae . It was endemic to Lake Malawi .

description

The type specimens have standard lengths of 195, 210 and 260 mm. The body height is 3.5 to 4 times and the head length 4.5 to 4.75 times included in the standard length. The head is 1.4 to 1.5 times longer than it is wide. The body is strongly flattened on the sides. The snout is rounded and more or less covered with horny tubercles. The lips are covered with small warts that form transverse folds. The lower lips have a few conical warts behind the folds. The muzzle folds are large with more or less serrated edges. A tiny barb is hidden behind a fold of skin at the corner of the mouth. The tail stalk is 1.2 to 1.33 times longer than it is tall. There are 39 to 40 scales on the lateral line organ and 16 to 18 scales around the caudal peduncle. The top of the body is olive to dark gray, the underside is light and the fins are grayish.

Way of life

Nothing is known about the way of life of Labeo worthingtoni . However, it is believed that this species, similar to other Labeo species, fed on the detritus on the lake bed.

Systematics

This species was described as Labeo intermedius by Edgar Barton Worthington in 1933 . Since the name was already given in 1917 by John Treadwell Nichols and Ludlow Griscom for a taxon that is today a synonym of Labeo chariensis Pellegrin, 1904 , Henry Weed Fowler chose the replacement name Labeo worthingtoni in 1958 and honored Worthington as the first descriptor in the species epithet . Peter Brian Neville Jackson named Labeo worthingtoni in his 1961 checklist of the fishes of Nyasaland as a dubious species. In the 1985 revision of the genus Labeo by Gordon McGregor Reid , it was recognized as a valid species again.

status

Labeo worthing toni is only three type specimens known, John Edmund Sharrock Moore in 1906 and Cuthbert Christy had collected from different parts of Lake Malawi in the 1932nd Moore's specimen was mistaken for Labeo mesops by George Albert Boulenger ; Worthington classified it in 1933 as a syntype of Labeo intermedius .

Labeo worthingtoni is easy to distinguish from the other two species in the lake, Labeo cylindricus and Labeo mesops . Therefore, it is unlikely that this species was overlooked during the numerous research programs undertaken in the nine decades since the lake was first collected.

Labeo worthingtoni was added to the IUCN's Red List of Recently Extinct Fish Species in 2018 . The causes of the extinction are unknown. Endangerment factors that influenced the population of Labeo mesops , for example , did not occur in Lake Malawi in the 1930s. Spawning streams were in good condition and the fishing effort was very low.

literature

  • EB Worthington: The fishes of Lake Nyasa (other than Cichlidae). Proceedings of the Zoological Society of London, 1933, pp. 285-316.
  • HW Fowler: Some new taxonomic names of fishlike vertebrates. Notulae Naturae (Philadelphia), 1958, pp. 1-16.
  • PBN Jackson: Check-list of the fishes of Nyasaland. Occasional Papers of the National Museum of Southern Rhodesia 3 (25B), 1961, pp. 535-621.
  • Gordon McGregor Reid: A revision of African species of Labeo (Pisces: Cyprinidae) and a redefinition of the genus. J. Cramer, Braunschweig, 1985, pp. 228-230.

Web links

Individual evidence

  1. ↑ EB Worthington: The fishes of Lake Nyasa (other than Cichlidae). Proceedings of the Zoological Society of London, 1933, pp. 285-316.
  2. ^ JT Nichols & L. Griscom: Fresh-water fishes of the Congo basin obtained by the American Museum Congo Expedition, 1909-1915. Bull. Am. Mus. Nat. Hist. 37 (25), 1917, pp. 653-756.
  3. ^ HW Fowler: Some new taxonomic names of fishlike vertebrates. Notulae Naturae (Philadelphia), 1958, pp. 1-16.
  4. ^ PBN Jackson: Check-list of the fishes of Nyasaland. Occasional Papers of the National Museum of Southern Rhodesia 3 (25B), 1961, pp. 535-621.
  5. ↑ Gordon McGregor Reid: A revision of African species of Labeo (Pisces: Cyprinidae) and a redefinition of the genus. J. Cramer, Braunschweig, 1985, pp. 228-230.
  6. ↑ Labeo worthingtoni in the IUCN Red List of Threatened Species 2018.2. Posted by: D. Tweddle, 2018. Retrieved November 19, 2018.