E. Genevelle 2001

Avec cet article, vous avez désormais entre vos mains les outils pour comprendre le jargon des Allgayer, Tawil et Burnel. C’est peu dire et ça va en dégoûter plus d’un. PS: Un grand merci à Pascal Romans (Laboratoire d’Ichtyo-écologie Tropicale et Méditerranéenne. Ecole Pratique des Hautes Etudes. ESA CNRS 8046. Université de Perpignan. 66860 Perpignan cedex) pour l’obtention de la documentation et à Robert Allgayer pour les superbes clichés à balayage.

Fig I


Position de la bouche.

Positions des pelviennes.

Types de caudales.

1 Premaxilla 6 Operculum 11 Lower jaw 16 interoperculum 21 Anus 26 Caudal fin 31 Hypural(s)
2 Maxilla 7 Dorsal fin spine(s) 12 Infraorbital bone(s) 17 Suboperculum 22 Anal fin spine(s) 27 Scales above lateral line 32 Interorbital space
3 Anterior nostril 8 Dorsal fin 13 Infraorbital shelf 18 Axillary scale 23 Anal fin 28 Scales below lateral line 33 Upper jaw (teeth)
4 Posterior nostril 9 Dorsal fin ray(s) 14 Preoperculum 19 Pelvic fin 24 Anal fin ray(s) 29 Last caudal vertebra 34 Prevomer (teeth)
5 Eye 10 Lateral line scale(s) 15 Branchiostegal ray(s) 20 Pectoral fin 25 Caudal peduncle 30 First ural vertebra 35 Palatine (teeth)
36 Gill raker 37 Gill rakers on upper limb 38 Gill rakers on lower limb 39 Gill filament(s)            
Total length: The greatest dimension between the anteriormost projecting part of the head and the farthest tip of the caudal fin (the caudal rays are pressed together). Fig. I, a-o
Standard length (= body length): The distance from the anteriormost tip of the snout or upper lip to the posteriormost point of the fold formed when the caudal peduncle is bent Fig. I, b-m
Fork length: In fishes with a forked caudal fin, the distance from the anteriormost tip of the snout or upper lip to the anteriormost point of the caudal posterior margin Fig. I, b-n
Body: The greatest dimension, exclusive of fins, and fleshly or scaly structures, which pertain to the fin base. Fig. I, h-i
Preanal length: The distance from the anteriormost tip of the snout to the center of the anus  
Head length: The distance from the anteriormost point of the farthest margin of the pectoral fin Fig. I, b-e
Caudal peduncle length: The distance from the base of the last anal ray to the posterior en of the hypural bone Fig. I, j-m
Caudal peduncle depth: The least depth of the caudal peduncle Fig. I, k-l
Snout length: The distance from the most anterior point of the snout or upper lip to the front margin of the orbit Fig. I, b-c
Eye diameter or orbital length: The greatest distance between the free orbital rims Fig. I, c-d
Interorbital width: The least width between the eyes Fig. I, p-q
Length of the upper jaw: The distance from the most anterior point of the premaxilla to the posterior end of the maxilla  
Mouth width: The greatest transverse distance across the opening the mouth  
Pectoral fin length: The distance from the extreme base of the uppermost ray to the farthest tip of the fin Fig. I, f-g
Counting scales
Lateral line scale count: The number of scales on the lateral line from the scales on the posterior end of the hypural bone Fig. I, 10
Scales above lateral line: The number of scale rows above the lateral line from the origin of the dorsal fin, including the small scales, and counting downward and backward following the natural scale row to, but not including the lateral-line scale. Fig. I, 27
Scales below lateral line: The number of scale rows below the lateral line is counted similary to that for rows above lateral line. The count is made upward and forward from the origin of the anal fin. In this count, as in the one above the line, the small scales are included Fig. I, 28
Counting vertebrae
Vertebrae: In teleosts the number of vertebrae is counted from the foremost precaudal vertebra articulating with the cranium, to the caudal vertebra attaching to the first ural vertebra.  
Counting gill rakers
Gill rakers: The number of gill rakers on the outside of the first gill arch, shown by 2 figures separated by a plus sign (+). Fig. I, E
Counting fin rays
Fin rays: There are 2 kinds of fin rays, i.e., the spines and the soft rays. Spines are unpaired structures, without segmentation, and designated by large Roman numerals (I; II, …). Soft rays, designated by the Arabic numerals (1, 2, …), are usually, though not always, branched and flexible, and are bilaterally paired and segmented. In a fin containing both spines and soft rays, the count for the spines is separated (e.g., XI-18). If the two sections are joined, a comma is used (e.g., XI,18).  
Counting branchiostegal rays
Branchiostegal rays: The total number of the rib-like slender bones located below the opercular bones and supported by the membrane Fig. I, 15

Chez un Tropheus, cela donne ceci:

Et les dents !

Continuons par une dissection:











Radiographies de cichlidés:





Poursuivons avec les différents types d’écailles que l’on trouve chez les poissons












Masuda H., Amaoka K., Araga C., Uyeno T. and Yoshino T., 1984. The fishes of the Japanese Archipelago. Vol 1. 431pp. Tokay University Press.
Datz Sonderheft – Tangajikasee

BOULENGER G.A. – Catalogue of the freshwater fishes of Africa in the British Museum – Vol III / 1915

NELISSEN M. H. J – A taxonomic revision of the genera Simochromis, Pseudosimochromis and Tropheus (pisces, cichlidae) – Musée Royal de l’Afrique centrale. Tervuren, Belgique – Annales – série N°8. Sciences Zoologiques N° 229 – 1979

POLL M. – Révision de la faune ichthyologique du lac Tanganyika – Annales du Musée du Congo Belge – C. Zoologie. Poissons, Reptiles, Amphibies – Série I, Tome IV Fascicule 3. – P 141-364 / 1946


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