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Showing results for tags 'Madagascar'.
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Medium sized fish with a rounded, laterally flattened body. Snout flattened. Dorsal and anal fins opposite and broad based. Attached behind the body's midpoint. Rhombic body. Caudal fin large, deeply divided. Often mixed up with the somehow similar looking Bobasatrania mahavavica. References: White, E.I. (1932) On a new Triassic fish from North-East Madagascar. Ann. a. Mag. Nat. Hist. (10), 10: 80-83. Woodward. A.S. (1910) On some Permo-Carboniferous fishes from Madagascar. Ann. Mag. Natur. Hist., ser. 8, 5: 1-6; London. Lehman, J. P. (1956) Compléments à l'étude des genres Ecrinesomus et Bobasatrania de l'Eotrias de Madagascar. Ann. Paléontol., 42: 67-94; Paris.
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- madagascar
- tff-oilshale-ch877
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Small fish with a rounded, laterally flattened body. Snout flattened. Dorsal and anal fins broad based, attached behind the body's midpoint. Caudal fin large, deeply divided. Trapeziodal body, anal fin attached behind dorsal fin. Often mixed up with the quite similar looking but much rarer Ecrinesomus dixoni By DiBgd - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=42205982 References: White, E.I. (1932) On a new Triassic fish from North-East Madagascar. Ann. a. Mag. Nat. Hist. (10), 10: 80-83. Woodward. A.S. (1910) On some Permo-Carboniferous fishes from Madagascar. Ann. Mag. Natur. Hist., ser. 8, 5: 1-6; London. Lehman, J. P. (1956) Compléments à l'étude des genres Ecrinesomus et Bobasatrania de l'Eotrias de Madagascar. Ann. Paléontol., 42: 67-94; Paris.
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Taxonomy from Lehman 1952. Genus Diagnosis from White 1933, p. 118: "Palæoniscidæ with fusiform bodies, long heads, and large orbits anteriorly placed. Gape wide and suspensorium very oblique. Frontals long with extreme irregular media] and digitate parietal sutures; parietals well developed with short triradiate sensory grooves and produced forwards into conspicuous median “ processes.” Preoperculum bent almost at fight-angles, with upper horizontal limb long and roughly triangular, but truncated by supratemporal margin: long wedge shaped bone “ Y ” in excavated antero—superior margin of operculum. Supratemporal large with anterior arm dividing strap-like intertemporal from frontal; four or five postorbital bones present. Teeth on outer margins of maxilla and dentary numerous, minute and sharply pointed. Fin—raye fine and very numerous, articulated dîstally in pectorals, but throughout in other fins; all distanty dichotomized; fulcra minute. Pectoral fins large, their length exceeding distance between their origin and that of ventralfins, which is somewhat nearer pectoral than anal fins; ventral and unpaired fins well developed, the triangular dorsal being posteriorly placed and somewhat anterior in position to similarly—shaped anal. Posterior half of caudal fin unknown. Scales small and numerous, deeplÿ overlapping, rhomboid in shape, their exposed surfaces covered with ganoine, obliquely ridged, and denticulated posteriorly." Species Diagnosis from White 1933, p. 120: "A Pteronisculus with fusiform body; maximum depth about equal to length of head with opercular apparatus, and rather less than one—third of total length to base of caudal fin. Length of pectoral fin somewhat less than distance between tip of snout and hinder margin of maxilla. Origin of dorsal fin above thirty—fourth scale—row from pectoral girdle approximately. Scales in about fifty—five vertical rows to base of caudal fin, and ornamented with oblique rugæ and a few finer rugæ running parallel to lower margin of scale on main flank—scales." Line drawing of the head from White 1933, p. 119: Line drawing from Lehman 1952, p. 69. References: White E. I. (1933) New Triassic Palaeoniscids from Madagascar. The Annals and Magazine of Natural History, Tenth Series 10:118-128. Lehman. J.-P. (1952) Etude complémentaire des poissons de l'Eotrias de Madagascar. Kungliga Svenska Vetenskapsakademiens Handlingar 2:1-201. References: White, E. I. (1933): New Triassic palaeoniscids from Madagascar. Ann. a. Mag. Nat. Hist.(10) 11: 118-128; London.
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- triassic
- palaeonisciformes
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From the album: Beginner collection
Desmoceratidae Puzosiinae Puzosia compressa (Cenomanian). Width : 10,5cm. -
From the album: Beginner collection
Douvilleiceratidae Douvilleiceras mammillatum (Albian). Width : about 5cm. -
From the album: Ammonites & Ammolites
112 - 99.5 mya,, Mahajangar/Tulear, Madagascar, Kept in a 12" x 8" x 0.75" riker mount -
From the album: My fossils collection
Perisphinctes.sp ammonite from Cretaceous period Madagascar-
- Perisphinctes
- ammonite
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