. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Heft 1/3 13/1962 Fishes of Northweistern Catmeroons 155 B A G R I D A E Auchenoglanis ahli Holly Holly, 1930 : 201, p], i. fig. 9. One specimen, mm. in standard length, collected in a brook about one mile from L. Barombi-ba-Kotto. A. ahli was described from six specimens from the Bakoko highlands, and was characterised by Holly thus: — Occipital process and interneural plate inconspicuous, hidden beneath the skin, not in contact with each other; maxillary barbe
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Heft 1/3 13/1962 Fishes of Northweistern Catmeroons 155 B A G R I D A E Auchenoglanis ahli Holly Holly, 1930 : 201, p], i. fig. 9. One specimen, mm. in standard length, collected in a brook about one mile from L. Barombi-ba-Kotto. A. ahli was described from six specimens from the Bakoko highlands, and was characterised by Holly thus: — Occipital process and interneural plate inconspicuous, hidden beneath the skin, not in contact with each other; maxillary barbel to times length of head; eye 7 to 7^3 times in length of head; dorsal spine more than half length of head, pectoral spine as long as dorsal, with coarse serrae on its posterior edge. The present specimen agrees in the first character, but the maxillary barbel is only % of the length of head (measured to end of occipital process). The eye is contained times in the length of head; the pectoral spine is more than half the length of head and is coarsely toothed (fig. 1); although the dorsal spine is shorter than in Holly's description (but agrees with his figure). Fig. 1. Premaxillary teeth and pectoral spines of, left, Auchenoglanis ahli (coll. Eisentraut) and, right, A. ballayi (topotype). The range of proportions due to individual variation and allometry has never been established in this genus, but it must be increased by the range of postmortem positions of the very mobile mouth. I am inclined to place the greatest emphasis on the coarseness of the serrations of the pectoral spine, and in this the present specimen contrasts with four specimens of A. ballayi Sauvage in the British Museum (Natural History). One of these is a topotype from Ngomo, Ogowe, one the type of its synonym A. pulcher Blgr. (Lindi R., Congo), the others are from R. Ta. A sketch kindly made for me by Dr. Kähsbauer of the pectoral spine of the type of A. ahli shows the same coarse ser
Size: 1211px × 2063px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcoll, booksubjectbiology, booksubjectzoology
