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Showing results for tags 'tithonian'.
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From the album: Vertebrates
Notagogus denticulatus Agassiz 1843 Late Jurassic Tithonian Schamhaupten District Eichstätt Bavaria Germany A baby of this rare species - length 2,5cm / 1" -
From the album: Invertebrates
Mecochirus longimanatus Schlotheim, 1820 Late Jurassic Tithonian Langenaltheim Obere Haardt Bavaria Germany -
Steinkern
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From the album: Corals
6x3cm. Silicified coral from the area around Tisbury, Wiltshire, UK, known as the "Star Coral". Tithonian, Late Jurassic Portland Group. -
Elasmodectes avitus VON MEYER, 1862 - a long-nosed chimaera
oilshale posted a gallery image in Member Collections
From the album: Vertebrates
Elasmodectes avitus VON MEYER, 1862 a Rhinochimaeridae - a long-nosed chimaera Late Jurassic Tithonian Painten Bavaria Germany Elasmodectes reconstruction- 1 comment
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From the album: Vertebrates
Holophagus penicilatus Egerton, 1861 Late Jurassic Tithonian Painten Germany Length 32cm -
From the album: Trace Fossils
2cm. diameter. Appropriately named member of the Faecichnia (Coprolites), in this case from a fish. Riedense subzone Hybonetum zone Upper Solnhofen Plattenkalk Early Tithonian, Late Jurassic Site: One of the many abandoned quarries in the area around Eichstaett, Bavaria, Germany. -
So I was browsing through the Archaeopteryx lithographica records on FossilWorks; and in one of the three records (from Workerszell, Eichstätt), I notice the mention of an 'unclassified' reptile taxon "Rhacehosaurus gracilis". The only further information that was provided was the age range (150.8 to 145.5 Ma) and the geographical distribution. I looked elsewhere online (google scholar, ResearchGate...) for any other mention of the genus "Rhacehosaurus", and nothing else turns up. Do you people know about this enigmatic taxon? Is it some kind of invalid synonym or something? I'd love to know more about this..
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Comments Amblysemius was clearly a predator as evidenced by its mouth full of sharp teeth. It was a notable fast swimmer. Together with its only sister genus Caturus, Amblysemius was a member of the extinct Halecomorpha family Caturidae. It appears that the halecomorph Liodesmus, known from Solnhofen only, is related to the Caturids, rather than the amiiforms, as has been usually surmised. Once a diverse major group of bony fishes, the Halecomorpha have only one surviving member, the bowfin (Amia calva) of eastern North America. Living bowfins are remarkably hardy since they have a swim bladder that opens into their esophagus so they can gulp air, and hence survive in water with low oxygen. Amblysemius was a primitive species of fish that thrived during the Jurassic Period but went extinct by the Lower Cretaceous Period. Amblysemius possessed ganoid scales that are more cycloid in nature and as a member of the holosteans a bony skeleton with a partially ossified vertebral column. The Caturidae are represented in the Solnhofen Formation by at least four species: Caturus furcatus Agassiz 1834 and Caturus giganteus Wagner, 1851. Caturus pachyurus Agassiz, 1833 and Caturus bellicianus Thiollière 1852 from Solnhofen, Germany and Cerin, France were transferred to the revived sister genus Amblysemius (now Amblysemius pachyurus and Amblysemius bellicianus). Compared to Caturus, Amblysemius is characterized by its more slender body outline, the bigger and more deeply forked caudal fin being heterocerc with the upper lobe clearly longer than the lower one and the strong dentition. Amblysemius has considerably smaller scales compared to Caturus. Maximum length is around 50cm; this specimen has only 20cm or 8". References: Paul Lambers (1994) The halecomorph fishes Caturus and Amblysemius in the lithographic limestone of Solnhofen (Tithonian), Bavaria. Geobios 27:91-99
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From the album: Vertebrates
Belonostomus sphyraenoides Agassiz, 1844 Late Jurassic Tithonian Eichstätt Bavaria Germany -
From the album: Vertebrates
Caturus furcatus AGASSIZ, 1834 Upper Jurassic Schernfeld Bavaria Germany Length 18cm So far unprepped -
From the album: Vertebrates
Pholidophorus sp. Upper Jurassic Tithonian Painten Germany -
The Caturidae are represented in the Solnhofen Formation by at least four species: Caturus furcatus Agassiz 1834, Caturus giganteus Wagner, 1851, Caturus pachyurus Agassiz, 1833 (all from Solnhofen) and Caturus bellicianus Thiollière 1852 from Solnhofen, Germany and Cerin, France. The last two species were transferred to the revived sister genus Amblysemius (now Amblysemius pachyurus and Amblysemius bellicianus). C. furcatus was clearly a predator as evidenced by its mouth full of sharp teeth. It was a notable fast swimmer possessing an elongated, somewhat thickset body with slender head. Together with its only sister genus Amblysemius, Caturus was a member of the extinct Halecomorpha family Caturidae. It appears that the halecomorph Liodesmus, known from Solnhofen only, is related to the Caturids, rather than the Amiiforms, as has been usually surmised. Caturus possessed ganoid scales that are more cycloid in nature and as a member of the holosteans a bony skeleton with a partially ossified vertebral column. The head is short an equipped with powerfully toothed jaws. The dorsal fin is pointed and attached just posterior to the body's midpoint. anal fin is attached somewhat more to the rear. The caudal fin is large and deeply divided. Juvenile species.
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Saccocoma tenella is the most common macrofossil of the Solnhofen Limestone. Taxonomy from Hess & Etter 2011. Reconstruction from Milson 1994, p. 123: References; Milsom, C. (1994) Saccocoma: a benthic crinoid from the Jurassic Solnhofen Limestone, Germany. Palaeontology, 37, 1, 121–129. H. Hess & W. Etter (2011): Life and death of Saccocoma tenella (GOLDFUSS). Swiss Journal of Geosciences 104(S1) · December 2011
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This fish from Painten (Kimmeridgian) was determined by Mrs. López-Arbarello ( Bayerischen Staatssammlung für Paläontologie und Geologie, Munich) as Macrosemimimus cf. fegerti. The exact determination is still pending. M. fegerti was found so far only in the somewhat younger lithographic layers (Tithonian) of Ettling (Markt Pförring). References: Schröder, K. M.; López-Arbarello, A.; Ebert, M. (2012) Macrosemimimus, gen. nov. (Actinopterygii, Semionotiformes), from the Late Jurassic of Germany, England, and France. Journal of Vertebrate Paleontology. 32 (3): 512–529. doi:10.1080/02724634.2012.649626.
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From the album: Vertebrates
Ebertichthys ettlingensis Arratia, 2016 Late Jurassic Tithonian Breitenhill Bavaria Germany -
From the album: Vertebrates
Macrosemimimus cf. fegerti Late Jurassic Tithonian Painten Germany -
From the album: Vertebrates
Propterus microstomus Agassiz 1833 Upper Jurassic Tithonian (Malm zeta) Eichstätt Germany Length 5,5cm -
Juvenile Allothrissops salmoneus. In the lithographic limestone of Germany, there are two Allothrissops species: A. salmoneus from the Solnhofen lithgraphic limestones in Bavaria and A. mesogaster from the slightly older deposits in Nusplingen, Baden-Württemberg. The small dorsal fin is located behind the anal fin. Taxonomy from Fossilworks.org. References: Blainville, H. de (1818) Sur les ichthyolites ou les poissons fossiles. Nouveau Dictionnaire d’Histoire Naturelle, 27, 310–395. Nybelin, O. (1964) Versuch einer taxonomischen Revision des Jurassischen Fischgattung Thrissops AGASSIZ. Goteborgs ¨ Kungl. Vetenskaps och Vitterhets-Samhalles Handlingar ¨ , 4, 1–44.
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Thrissops formosus, a member of the family Ichthyodectidae (literally "fish-biters"), was a swift-swimming predatory fish with streamlined body and deeply clefted caudal fin from the Lithographic Limestone deposits around Solnhofen, Germany. Dorsal and anal fins are broad based and attached behind the body's midpoint. The anal fin is diagonally attached slightly before the dorsal fin. References: L. Cavin, P. L. Forey, and S. Giersch (2013) Osteology of Eubiodectes libanicus (Pictet & Humbert, ) and some other ichthyodectiformes (Teleostei): phylogenetic implications. Journal of Systematic Palaeontology 11(2):115-177.
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From the album: Vertebrates
Macromesodon gibbosus (WAGNER, 1851) Solnhofen Formation Tithonian Late Jurassic Birkhof District of Eichstätt Germany Length 5cm / 2" The former name Eomesodon is not valid anymore -
Invalid names: Gyronchus gibbosus; Eomesodon gibbosus. Emended Diagnosis from POYATO-ARIZA & WENZ 2002 in Poyato-Ariza & Wenz 2004, p. 367: "Primitive pycnodontoid fish with the following unique combination of primitive and derived characters: dorsal prominence angle-shaped, with straight dorsal border present; loricate scale pattern; caudal pedicle not differentiated; frontals curved and short; tubular infraorbitals and infraorbital tesserae present; 4 dentary teeth; 3 prearticular tooth rows; 30 or more vertebrae (epaxial elements excluding those of the caudal endoskeleton); dorsal fin rounded anteriorly; more than 17 dorsal ridge scales. References: Poyato-Ariza, F. J. & Wenz, S. (2004) The new pycnodontid fish genus Turbomesodon, and a revision of Macromesodon based on new material from the Lower Cretaceous of Las Hoyas, Cuenca, Spain. Mesozoic Fishes 3 - Systematics, Paleoenvironments and Biodiversity, G. Arratia & A. Tintori (eds.): pp. 341-378,15 figs., 1 tab., 3 apps. © 2004 by Verlag Dr. Friedrich Pfeil, München, Germany - ISBN 3-89937-053-8
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From Wikipedia: "Members of the order are distinguished by possessing two dorsal fins, an anal fin, five gill slits, eyes without nicititating membranes, and a mouth extending behind the eyes. Also, unlike other sharks, they maintain a higher body temperature than the surrounding water". References: DETLEV THIES & ARMIN LEIDNER (2011) Sharks and guitarfishes (Elasmobranchii) from the Late Jurassic of Europe. Palaeodiversity 4: 63–184; Stuttgart, 30 December 2011. (version with low resolution, but still 16MB to download)
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References: Hermann Polz (2009) Alcmonacaris winkleri g. nov. sp. nov. (Crustacea: Decapoda: Pleocyemata: Caridea) aus den Solnhofener Plattenkalken von Eichstätt. Archaeopteryx 26: 1–9.
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References: Alessandro Garassino & Günter Schweigert (2006) The Upper Jurassic Solnhofen decapod crustacean fauna: review of the types from old descriptions. Part I. Infraorders Astacidea, Thalassinidea, and Palinura". Memorie della Società Italiana di Scienze Naturali e del Museo Civico di Storia Naturale di Milano 34. Schlotheim E.F. von (1822) Nachträge zur Petrefactenkunde, 1. Gotha: Becker
