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From the album: Vertebrates
Whiteia sp. Early Carboniferous Wapity Lake British Columbia Canada-
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Picture number 3 shows a close up of the scales. Taxonomy according to Yabumoto & Brito, 2016. Yabumoto & Brito 2016, p. 234: "The locality and horizon of the type specimens are not precisely known. Available information is that the locality lies in the area of Noe Bihati, West Timor, Indonesia." Diagnosis in Yabumoto & Brito 2016, p 234: "Whiteia with the following combination of characters: with five to ten sparse long ridges on scales, nine rays (seven anterior long and two posterior short) on the first dorsal fin, pointed denticles on the anterior fin rays of the first dorsal fin, operculum with many tubercles, postparietal with many pits and short radial grooves, angular with radial grooves and other bones of the head smooth, without tubercles." Line drawing of the holotype by Yabumoto & Brito, p. 235: A.b = basal plate of anal fin; D1.b = basal plate of first dorsal fin; D2.b = basal plate of second dorsal fin; L = lung; P.b = pelvic bone. Identified by oilshale using Yabumoto & Brito, 2016. Reference: YABUMOTO, YOSHITAKA AND BRITO, PAULO M. (2016) A new Triassic coelacanth, Whiteia oishii (Sarcopterygii, Actinistia) from West Timor, Indonesia. Paleontological Research, vol. 20, no. 3, pp. 233–246.
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- coelacanth
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First of all, the list of fish found in Madagascar - there are more than 30 species! So many that I can't treat all of them (and I've never seen some of them). There is relatively old, but good literature on it - Lehman has written one of the most comprehensive publications on this subject: J.-P.Lehman (1952) Etude Complementaire des Poisson de L'Eotrias de Madagascar. Kungl. Svenska Vetenskapsakademiens Handlingar. Fjärde Serien Bd 2 No 6 (in French, 244 pages, 340MB!) Australosomus merlei Piveteau, 1934 is easy to recognize: Small to medium size fish (~ 10 to 15cm / 4 to 6"), fusiform body, relatively small head with a slightly rounded snout. Its dorsal fin is located in the posterior fourth of the body. Caudal fin divided with wide lobes. Scales on the flanks are noticeably stalk-shaped. Ecrinesomus dixoni Woodward, 1910 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. Unfortunately the head is not completely preserved. Bobasatrania mahavavica White, 1932 There's quite a confusion between Ecrinesomus and Bobasatrania. Even in publications the same reconstruction (the same drawing!) is sometimes labeled as Bobasatrania and sometimes as Ecrinesomus. In the first publication about Ecrinesomus, one Bobasatrania was mistakenly mixed in between. Bobasatrania has a crooked diamond-shaped body – while Ecrinesomus's anal and dorsal fins start directly opposite. Boreosomus gillioti Priem, 1924 Small to medium sized fish (10 to 20 cm / 4 to 8"). Slender body, dorsal fin small, located before the body's midpoint. Caudal fin divided. Strong, rectangular scales. Parasemionotus labordei Priem, 1924 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 fins small. Caudal fin moderately divided. Eyes remarkably large. Teffichthys madagascariensis Piveteau, 1934 (=Perleidus madagascariensis) Medium sized fish with a somewhat thickset appearance. Bulky head. Its dorsal fin is located in the posterior third of the body. Pteronisculus cicatrosus White, 1934 Small to medium fish with fusiform body (less than 15cm / 6" ?). Small dorsal fin, located slightly behind the midpoint of the body, diagonally opposite the anal fin. Big eyes. Relatively long and broad pectoral fins. Comparatively small scales. Pteronisculus macropterus White, 1933 In his 1933 paper, White described two new Pteroniscoids from Madagascar: Pteronisculus cicatrosus , which is rather common and the somewhat rarer Pteronisculus macropterus. According to White, P. macropterus is characterized by an "elongate-fusiform body; maximum depth rather less than length of head with opercular apparatus, and equal to one-quarter total length to base of caudal fin. length of pectoral fin exceeding distance between tip of snout and hinder margin of maxilla. Origin of dorsal fin above fortieth scale-row from pectoral girdle approximately. Scales in more than seventy vertical rows to base of caudal fin, and ornamented with oblique rugae only." Paracentrophorus madagascariensis Piveteau, 1940 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 well behind end of dorsal fin. Caudal fin moderately divided. Eyes remarkably large. Icarealcyon malagasium Beltan, 1984 Icarealcyon can be easily mixed up with Parasemionotus; characteristic are the huge pectoral fins. Due to its enormous pectoral fins, Icarealcyon malagasium was described by Beltan as a "poisson volant" - a "flying fish" - in the family Semonotidae (not related to what is now known as "flying fish" - these are Exocoetidae in the order Beloniformes). You would expect flying fish to be fast swimmers - the rather thickset appearance of Icarealcyon more likely hints to slow swimmers with relatively high maneuverability (comparable to Albertonia from British Columbia). Fig. C is Icarealcyon - the reconstruction is not quite correct. Saurichthys madagascariensis Piveteau, 1945 Medium sized fish with elongated, streamlined jaws. Head elongated. Dorsal fin almost at the end of the body, opposite the anal fin. Small scales. Whiteia woodwardi Moy-Thomas, 1935 Massive body. Pectoral fin attached slightly before the first dorsal fin. Piveteauia madagascariensis Lehman 1952 More slender body. Pectoral fin attached well before first dorsal fin lobe. Ventral fin opposite to first dorsal fin lobe. Have fun Thomas PS: If you are interested in Lehman's paper send me a PM with your email address (remember - 340MB!)
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- ambilobe
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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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