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Showing results for tags 'madagascar'.
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From the album: Vertebrates
Pteronisculus macropterus White, 1933 Lower Triassic Dienerian Ambodipo Madagascar Length 8cm / 3"-
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This looked like one mean Notosuchian. http://www.bbc.com/news/science-environment-40492978
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Hi guys, Thinking of buying this nice heteromorph ammonite from this Chinese seller. It originates from Madagascar and I'd like to know what genus or species (if possible) it is? And roughly how old as well. Thanks!
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Taxonomy from Fossilworks.org. Emended Diagnosis from Clement 1999, p. 234: "Fish of small size, standard length about 13 to 14 cm and maximum body depth about 3 to 3,5 cm. Body shape very elongated. Pelvic fins situated immediately in front of the level of the first dorsal fin (but not connected to the pectoral girdle). Presence of descending processes of the posterior parietal, postparietal and supratemporal. Lachrymojugal very elongated, slightly curved and not anteriorly angled. Palatal surface of the entopterygoid covered with numerous parallel sinuous rows and tiny rounded denticles. Midpart of angular very elevated, presenting a well-developed posterior angle . Ossified parapophyses absent in the anterior part of the notochord and very small under the second dorsal fin, increasing in size as far back as the anterior part of the caudal fin. Ornamentation of the squamation consisting of about 15 well-marked ridges, parallel to the longitudinal axis of the scales." Identified by oilshale using Clement 1999. References J. A. Moy-Thomas. 1935. The coelacanth fishes from Madagascar. Geological magazine 72:213-226 Lehmann, J.-P. (1952): Étude complémentaire des poissons de l’Eotrias de Madagascar. Kungliga Svenska Vetenskaps-akademiens Hangdlingar (4), 2 (6): 1-201; Stockholm. Gael Clement (1999) The Actinistian (Sarcopterygii) Piveteauia madagascariensis Lehman from the Lower Triassic of Northwestern Madagascar: A Redescription on the Basis of New Material. Journal of Vertebrate Paleontology Vol. 19, No. 2, pp. 234-242 (9 pages).
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- coelacanth
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Helllo friendly folks of the fossil forum, I have been searching for a coelacanth fossil on and off for years now. I finally found one that preserved all the characteristic fin "limbs" in profile from an Ebayer who acquired it while in Madagascar. I was pleased with the degree of preservation on both split halves. To my surprise, taking a hand lens to the more concave side revealed scale preservation. I know this is typical of bony fish with scutes like Gars from the Green River, WY - but! Is this unusually good for nodules in Madagascar? More to the point, am I keeping something away from the scientific eye that should be seeing this? I imagine 3-D scanning could reveal finer details for comparison to the living fossil ancestor today. Attached are photos taken with my iPhone and two photos through a regular light microscope at 2x magnification. Thank you for any advice or knowledge you may have on these classes of coelacanths. Warmly, Mark
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From the album: WhodamanHD's Fossil collection.
Ammonite purchased online, from Madagascar. formation is unknown to me. Cretaceous period. -
From the album: WhodamanHD's Fossil collection.
Coprolite bought at store. From Madagascar. I assume turtle. -
is this sauropod tooth restored?
Wowbnjijdat posted a topic in Is It Real? How to Recognize Fossil Fabrications
On a auction website I found this tooth, and I am really curious about, is the tooth restored? The seller says it is al natural, and that behind the matrix even are a few pieces from another tooth. And what is such a tooth worth? It is really a dream for me to poses a tooth of my favourite dinosaurs, the sauropods Kind regards, JK
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From the album: Nigel's album
Ebay purchase -
From the album: Nigel's album
Albian formation, Madagascar 3.2 inches at its widest point -
From the album: Nigel's album
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Does anybody know how I could go about obtaining some ammonites from Madagascar which haven't been polished? The polished ones are extremely common and very cheap, but very rarely do I see unpolished ones. I guess they are polished before they ever go on sale - but does anybody know where I might obtain some which are unpolished? Oh, and without the ends being ground flat would also be a bonus! Thanks.
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I bought some coprolites ( Mineralized dung) that came from Madagascar. I have some questions. What is the real age of them? Some sellers on the Internet say it's from the Eocene, others say it's from the pliocene. What animal did they come from? They were labeled as turtle coprolites. And last, Are they really coprolites? They could easily be concretions or some other geological thing. I have not been able to find much information. Here's a pic
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For christmas, my husband bought me two ammonites. I'll show the second one in another thread. It is about 7 cm on 10 cm. The dealer told him this one was a placenticeras in aragonite from Madagascar, for me it more looks like a douvilleiceras, but i am not an expert so i need your help :
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Fossil fish from Madagascar
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Taxonomy from Kogan & Romano 2016. Diagnosis from Kogan & Romano 2016, p. (e1151886-5): "Medium-sized saurichththyid (sensu Tintori, 2013) of at least 60 cm total length (MNHN.F MAE 2524, FG 1/2013, PIMUZ A/I 4144); extensive scale cover with high mid-lateral scales, broad mid-dorsal and mid-ventral scales, and numerous smaller rhombic scales present in dorsolateral and ventrolateral positions; one ventrolateral row of specialized, enlarged scales that are shaped like a tilted ‘L’; all fins with fringing fulcra of Pattern C (sensu Arratia, 2009), and with segmented, distally branched lepidotrichia; operculum long and subtriangular; antoperculum present; one pair of branchiostegal rays; suborbital bone developed; circumorbital series including a well-developed supraorbital, a dermosphenotic, and at least one posterior infraorbital bone; surangular very narrow and anteriorly reaching the level of the center of the orbit; elongate postorbital portion of the cranium, skull (including operculum) measuring about 27% of the total body length." References: Pivetau, J. (1944-45): Paléontologie de Madagascar, XXV. Les poissons du Trias inférieur. La famille des Saurichthyidés. Ann. Paléont., 31: 79-87. Rieppel, O. (1980): Additional specimens of Saurichthys madagascariensis from the Eotrias of Madagascar. N.Jb. Geol. Paläont. Mh., 1980 (1): 43-51. Beltan, L. (1996): Overview of systematics, paleobiology and paleoecology of Triassic fishes of northwestern Madagascar. In: Mesozoic Fishes - Systematics and Paleoecology, 1996, pp. 479-500. ISBN3-923871-90-2. Kogan, I. und Romano, C. (2016): Redescription of Saurichthys madagascariensis Piveteau, 1945 (Actinopterygii, Early Triassic), with implications for the early saurichthyid morphotype. Journal of Vertebrate Paleontology. Vol. 36, Iss. 4, 2016 DOI: 10.1080/02724634.2016.1151886
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From the album: Vertebrates
Saurichthys madagascariensis Piveteau, 1945 Early Triassic Dienerian Sakamena Formation Anktokazo Madagascar Length 60cm Lit.: Pivetau, J. (1944-45): Paléontologie de Madagascar, XXV. Les poissons du Trias inférieur. La famille des Saurichthyidés. Ann. Paléont., 31: 79-87; Paris Rieppel, O. (1980): Additional specimens of Saurichthys madagascariensis from the Eotrias of Madagascar. N.Jb. Geol. Paläont. Mh., 1980 (1): 43-51; Stuttgart Kogan, I. und Romano, C. (2016): Redescription of Saurichthys madagascariensis Piveteau, 1945 (Actinopterygii, Early Triassic), with implications for the early saurichthyid morphotype. Journal of Vertebrate Paleontology. Vol. 36, Iss. 4, 2016 DOI: 10.1080/02724634.2016.1151886 -
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.
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References: Van Straelen V. (1933) Antrimpos madagascariensis Crustace decapode du Permotrias de Madagascar. Bull. Mus. Roy. hist. Nat. Belgique, Bruxelles, IX(1). Garassino A. & Teruzzi G., (1995) Studies on Permo-Trias of Madagascar, 3. The decapod crustaceans of the Ambilobe region (NW Madagascar). Atti. Soc. it. Sci. nat. Museo civ. Stor. nat. Milano, Milano, 134 (1): 85-113.
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Taxonomy from Fossilworks.org. Diagnosis for Whiteia woodwardi from Moy-Thomas 1935, p. 215: "Medium sized or small slender Coelacanths. Head relatively large. Skull with triangular operculars and preoperculars, quadrato-jugals, squamosals, postorbitals, lacrimo-jugals, supra- temporals, parietals, five extra scapular (post-parietal) plates and the angular ornamented with numerous tubercles. The coronoids are dumb-bell shaped and unornamented. The dermosphenotics (post frontals) are separate from the frontals, and the supraorbital series are pierced by large lateral line pores. Circumorbital ring well developed. Parasphenoid rather broad. Pterygoids with wide anterior limb and apparantly no notch in their dorsal margin. All the lepidotrichia of the anterior dorsal fin, and at least the most anterior of the dorsal and ventral lobes of the caudal fin ornamented with two rows of denticles. Pelvic fins situated behind the anterior dorsal fin about half-way between the two dorsal fins. Anal fin behind the posterior dorsal fin. Scales ornamented with tubercles, elongated tubercles, short ridges, or ridges stretching the whole length of the exposed area of the scales. This ornament runs approximately antero-posteriorly." References: Moy-Thomas, J. A. (1935) The coelacanth fishes from Madagascar. Geological magazine 72:213-226. Woodward, A.S. (1910) On some Permo-Carboniferous Fishes from Madagascar. Ann. Mag. Natur. Hist., ser. 8, 5: 1-6. Beltan, L. (1980a) Eotrias du Nord-Ouest de Madagascar: Etude de quelques poissons, don’t un est en parturition. Ann Soc. Geol. Nord, 99: 453-464; Lille.
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Taxonomy from Fossilworks.org. Description from Frickhinger 1995, p. 417: "Small fish (up to 15cm / 6") with a rounded body, somewhat thickset appearance. Broad but short head. Dorsal fin attached to the posterior half of the body. Pectoral and anal fin small. Anal fin almost opposite to dorsal fin. Caudal fin moderately divided. Eyes remarkably large." Reconstruction of the head region: References: Priem, F. (1924): Paléontologie de Madagascar, XII. Les poissons fossiles. Ann. Paléont., 13: 107-132; Paris. Piveteau, J. (1934): Paléontologie de Madagascar, XXI. Les poissons du Trias inferieur. Contribution à l’étude des Actinoptérygiens. Ann Paléont., 23: 81-180; Paris. Piveteau, J. (1940): Paléontologie de Madagascar XXIV Nouvelles recherches sur les poisson du Trias inférieur. Ann. Paleont., 28: 69-88. Frickhinger, K. A. (1995) Fossil Atlas, Fishes. Mergus Verlag.
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Taxonomy from Fossilworks.org. Description by oilshale: Small fish (up to 15cm / 6") with a rounded body, somewhat thickset appearance. Dorsal fin attached to the posterior half of the body. Pectoral and anal fin relatively large. Anal fin starts behind end of dorsal fin. Caudal fin moderately divided. Eyes remarkably large. Reconstruction of the head region: References: Piveteau, J. (1940): Paléontologie de Madagascar XXIV Nouvelles recherches sur les poisson du Trias inférieur. Ann. Paleont., 28: 69-88
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Taxonomy from Fossilworks.org. Perleidus madagascariensis was recently redescribed by Tintori et al as Teffichthys madagascariensis. Origin of the name: Named after ‘TEFF’ (Triassic Early Fish Fauna; see Tintori et al. 2014), being one of the most common representatives of this assemblage, and from Greek ‘ichthys’, meaning ‘fish‘. Diagnosis from Marramà et al. 2017, p. 223: "Small- to medium-sized basal (non neopterygian) actinopterygian fish having the following unique combination of characters: body elongate and tapered; dermal cranial bones ornamented with tubercles and ridges; parietals subquadrangular in shape with three pit-lines (anterior, median and posterior); posttemporals widely separated; suborbital and spiracular ossicles present; two to five supraorbitals; nasals separated by the rostral; maxilla fixed to an almost vertical preopercle; straight oral margin of maxilla, which is dorso-posteriorly expanded; jaws with styliform teeth; broad vertical or slightly forward inclined preopercle; opercle smaller than subopercle; five to eight branchiostegal rays; dorsal and anal fins inserted in the posterior half of the body; median-fin rays only distally segmented and supported by an equal number of pterygiophores at least in the middle part; fringing fulcra present on all fins; abbreviated heterocercal caudal fin; anteriormost lateral trunk scales higher than wide, with serrated posterior margin." Reconstruction from Marramá et al., 2017, p. 228: References: Piveteau, J. (1934): Paléontologie de Madagascar, XXI. Les poissons du Trias inferieur. Contribution à l’étude des Actinoptérygiens. Ann Paléont., 23: 81-180; Paris Marramà G., Lombardo C., Tintori A. & Carnevale G. (2017) - Redescription of ‘Perleidus’ (Osteichthyes, Actinopterygii) from the Early Triassic of northwestern Madagascar . Riv. It. Paleontol. Strat., 123(2): 219-242.
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Another one to identify, Crinoids appear to be a little difficult to identify but this has a fairly complete head. I am looking for opinions on authenticity as well. Looking at the progression of crinoid evolution this looks similar to some from Ordovician to the Permian.
