Titre du document / Document title

Position phylogénétique de Dagetichthys lakdoensis (Pleuronectiformes) = Phylogenetic placement of Dagetichthys lakdoensis (Pleuronectiformes)

Auteur(s) / Author(s)

CHAPLEAU F. ⁽¹⁾ ; DESOUTTER M. ⁽²⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ Institut de Biologie Ottawa-Carleton, Département de Biologie, Université d'Ottawa, Boîte Postale 450, Succursale A, Ottawa, Ontario, K1N 6N5, CANADA
⁽²⁾ Laboratoire d'Ichtyologie générale et appliquée, Muséum national d'Histoire naturelle, 43 rue Cuvier, 75231 Paris, FRANCE

Résumé / Abstract

Dagetichthys lakdoensis is a small freshwater flatfish (Pleuronectiformes) inhabiting the drainage basin of the Bénoué river in Cameroon, more than 1300 km inland from the Atlantic Ocean. The familial affinities (Achiridae or Soleidae) of this genus have never been clearly established. A morphological and osteological study of radiographs and of a cleared and stained specimen resulted in the finding of the previously determined autapomorphies of the family Soleidae. In addition, we have found two derived characters (presence of 1 or 2 rays on the pelvic fins and an elongated urohyal without a ventral branch) that unite Dagetichthys and all the species associated with the genus Synaptura. Because the monophyletic status of the latter genus was found to be dubious, we cannot, at this point, determine if Dagetichthys is the sister-group of the genus Synaptura or the sister-group of one (or several) species within the genus. We discuss the fact that, from a biogeographical standpoint, the latter possibility appears more plausible.

Revue / Journal Title

Cybium   ISSN 0399-0974   CODEN CYBIDK 

Source / Source

1996, vol. 20, n^o1, pp. 103-106 (14 ref.)

Langue / Language

Français
Revue : Anglais

Editeur / Publisher

Société française d'ichtyologie, Paris, FRANCE  (1947) (Revue)

Mots-clés anglais / English Keywords

Taxonomy ; Morphology ; Bone ; Phylogeny ; Cameroon ; Freshwater environment ; Africa ; Pisces ; Vertebrata ;

Mots-clés français / French Keywords

Systématique ; Morphologie ; Os ; Phylogenèse ; Cameroun ; Dagetichthys lakdoensis ; Synaptura ; Soleidae ; Achiridae ; Milieu eau douce ; Afrique ; Pisces ; Vertebrata ;

Mots-clés espagnols / Spanish Keywords

Sistemática ; Morfología ; Hueso ; Filogénesis ; Camerun ; Medio agua dulce ; Africa ; Pisces ; Vertebrata ;

Localisation / Location

INIST-CNRS, Cote INIST : 18325, 35400004311867.0090