. Catalogue of the fresh-water fishes of Africa in the British Museum (Natural History). British Museum (Natural History); Fishes; Freshwater animals. GASTEOSTEUS. 107 1. GASTEOSTEUS. Linn. Syst. Nat. i. p. 489 (1766), part, ; Cuv. & Val. Hist. Poiss. iv. p. 479 (1829) ; Giinth. Cat. Fish. i. p. 2 (1859), part. Body moderately elongate. Snout short, not tubiform. Villiform teeth in jaws, none on palate. Dorsal fin with 3 to 11 spines, soft part similar to anal. Pelvic bones united to form a triangular or lanceolate plate between the ventral fins. Vertebrae 29-33. A single species in Africa
. Catalogue of the fresh-water fishes of Africa in the British Museum (Natural History). British Museum (Natural History); Fishes; Freshwater animals. GASTEOSTEUS. 107 1. GASTEOSTEUS. Linn. Syst. Nat. i. p. 489 (1766), part, ; Cuv. & Val. Hist. Poiss. iv. p. 479 (1829) ; Giinth. Cat. Fish. i. p. 2 (1859), part. Body moderately elongate. Snout short, not tubiform. Villiform teeth in jaws, none on palate. Dorsal fin with 3 to 11 spines, soft part similar to anal. Pelvic bones united to form a triangular or lanceolate plate between the ventral fins. Vertebrae 29-33. A single species in Africa. 1. GASTEOSTEUS ACULEATUS. Linn. S. N. i. p. 489 (1766). This species, widely distributed in the seas and fresh waters of the cold and temperate parts of the Northern Hemisphere, is represented in the fresh waters of Algeria by the following form, which may be designated as var. algeriensis:— Gasterosteits leiurus (non C. & V.), Gerv. Zool. Pal. Gen. p. 202, pi. xlv. fig. 1 (1869). Gasterosteus hrachycentrus (non C. & V.), Playf. & Letourn. Ann. & Mag. N. H. (4) viii. 1871, p. 388. Gasterosteus algeriensis, Sauv. N. Arch. Mus. X. 1874, p. 17 ; Regan, Ann. & Mag. N. H. (8) iv. 1909, p. 437. Fig. Gastrosteus aculeatus, var. algeriensis. x 1J. Depth of body 3^ to 4 times in total length, length of head 3j to 3^ times. Snout as long as or a little shorter than eye, which is 3 to 3^ times in length of head. D. I, I, I 11-12 (rarely I, I, I, I 12); spines rather narrow and feebly denticulated at the sides, first and second equal or second the longer, usually measuring less than diameter of eye, first behind vertical of base of pectoral. Anal I 8-9. Ventral spine | to | length of pelvic plate. 1-4 bony plates above the ascending process of the pelvis, body sometimes entirely naked; no lateral keel on the caudal peduncle. Total length 50 millim. Metidja, near Algiers. 1-36. Ad., hgr., & yg. Ditches in the Metidja. Sir L. Playfair (P.).. Please note that
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