Synodontis nummifer

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Synodontis nummifer
Synodontis nummifer.jpg
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Siluriformes
Family: Mochokidae
Genus: Synodontis
Species: S. nummifer
Binomial name
Synodontis nummifer
Boulenger, 1899

Synodontis nummifer, known as the two spot synodontis,[1][2] is a species of upside-down catfish native to the Congo Basin of Cameroon, the Democratic Republic of the Congo and the Republic of the Congo.[3] It was first described by the Belgian-British zoologist George Albert Boulenger in 1899, based upon a holotype discovered in Léopoldville, Belgian Congo.[2] The specific name "nummifer" comes from the Latin for "to bear a coin", which refers to the large spots on its sides.[1]

Description[edit]

The body of the fish is olive colored on the back transitioning to whitish on the underside.[4] The sides of the fish have a large round black spot on each side, above the lateral line, and frequently a second spot above the base of the anal fin.[4] The pigmentation of the head is spotted.[2]

Like other members of the genus, this fish has a humeral process, which is a bony spike that is attached to a hardened head cap on the fish and can be seen extending beyond the gill opening.[1] This process is broad and rounded at the end, and extends as far as the occipito-nuchal process.[4] The first ray of the dorsal fin and the pectoral fins have a hardened first ray which is serrated,[1] as long or a little longer than the head.[4] The caudal fin is very deeply forked.[4] It has short, cone-shaped teeth in the upper jaw.[1] In the lower jaw, the teeth are s-shaped and movable.[1] The fish has one pair of maxillary barbels, with broad membranes at the base, as long as the head or slightly shorter,[4] and two pairs of mandibular barbels that are often branched.[1][2] The adipose fin is about four times as long as it is deep.[4] The pectoral spine is a little shorter than the head, and strongly serrated on both sides.[4]

This species grows to a length of 17.5 centimetres (6.9 in) SL although specimens up to 20.5 centimetres (8.1 in) TL have been recorded in the wild.[1][3]

Habitat[edit]

In the wild, the species inhabits tropical waters with a temperature range of 22 to 25 °C (72 to 77 °F), a pH of 6.4 – 7.2, and dH range of up to 18.[3] It has been found throughout the Congo River basin, but not the southern tributaries of the Congo River.[5]

References[edit]

  1. ^ a b c d e f g h "Synodontis nummifer Boulenger, 1899". Planet Catfish. 17 Jan 2009. Retrieved 17 October 2016. 
  2. ^ a b c d "Synodontis nummifer Boulenger, 1899". scotcat.com. Retrieved 17 October 2016. 
  3. ^ a b c Froese, Rainer and Pauly, Daniel, eds. (2016). "Synodontis nummifer" in FishBase. June 2016 version.
  4. ^ a b c d e f g h Boulenger, George Albert (1909). Catalogue of the fresh-water fishes of Africa in the British museum (Natural history). London: British Museum. pp. 463–465. 
  5. ^ Moelants, T. (2010). "Synodontis nummifer". IUCN Red List of Threatened Species. Version 2016.2. International Union for Conservation of Nature. Retrieved 17 October 2016. 

External links[edit]

Data related to Synodontis nummifer at Wikispecies