3 новых вида Tilapia (Cichlidae) из Камеруна

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3 новых вида Tilapia (Cichlidae) из Камеруна

Сообщение Yan » Пт дек 10, 2010 12:41 am

Tilapia ejagham
Tilapia fusiforme
Tilapia nigrans

Dunz & Schliewen, 2010
Abstract

Three new species of the genus Tilapia Smith, 1840 are described from Lake Ejagham (Cameroon) and T. deckerti Thys van den Audenaerde, 1967 is redescribed. T. deckerti differs from all other Tilapia sensu lato except few members of the subgenus Coptodon in quadricuspid posterior pharyngeal teeth on lower pharyngeal jaw, which is in addition only known from T. tholloni, T. cameronensis, T. dageti, T. congica, T. ejagham spec. nov., and T. nigrans spec. nov. From these species it can be distinguished by discrete characters. Tilapia ejagham spec. nov. differs from all other Tilapia sensu lato except T. joka, T. bilineata, T. nigrans spec. nov. and all members of the subgenus Coptodon (including T. ismailiaensis and T. camerunensis) in tricuspid (rarely quadricuspid) pharyngeal teeth in the posterior two rows of lower pharyngeal jaw. It differs from T. joka in a higher number of gill rakers on first ceratobranchial (9-10 vs. 6-8), from T. bilineata in lacking a densely scaled caudal fin, from members of the subgenus Coptodon in discrete characters or in a combination of characters as deduced from principal component analyses. Tilapia nigrans spec. nov. differs from all other Tilapia sensu lato except few members of the subgenus Coptodon in quadricuspid or pentacuspid posterior pharyngeal teeth on lower pharyngeal jaw. Quadricuspid pharyngeal teeth are otherwise only known from T. tholloni, T. cameronensis, T. dageti, T. congica, T. ejagham spec. nov. and T. deckerti. From these species it is distinguished by discrete characters. Tilapia fusiforme spec. nov. is characterized by a slender fusiform body, an acute mouth, a black breeding coloration and a “tilapia spot” extended to a longitudinal stripe in
juveniles.
Description of a Tilapia (Coptodon) species flock of Lake Ejagham (Cameroon), including a redescription of Tilapia deckerti Thys van den Audenaerde, 1967 (Perciformes, Cichlidae)
Andreas R. Dunz & Ulrich K. Schliewen
Spixiana, 33 (2): 251–280, 2010.
Ян

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