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Showing results for tags 'bajocian morocco'.
Found 16 results
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From the album: MY FOSSIL Collection - Dpaul7
Stephanoceras (Normannites) sp. Ammonite Bajocian, Morocco Jurassic period ( 201.3 -145 million years ago) Stephanoceras (meaning crown horn) is an extinct genus of Stephanoceratoid ammonite which lived during the Bajocian (Middle Jurassic). It is the type genus of the family Stephanoceratidae. Stephanoceras has an evolute shell, as characteristic of the family, with well-developed ribbing and tubercles. The shell is coiled so whorls barely touch in most, but some have notable overlap. Primary ribs emerge from the umbilical seam, the line marking the inner edge of the particular exposed whorl, and divide on the flanks, usually in two, occasionally in three, forming secondary ribs that cross the outer rim of the shell, known as the venter, uninterrupted. Turbercles, elevated projections, form at the ends of the primary ribs where they bifurcate or sometimes trifurcate. Stephanoceras grew to be fairly large with a shell diameter as much as 27 cm and width as much as 6 cm across the outer whorl. Like many ammonites, Stephanoceras is dimorphic with a large, macroconch, form thought to be female and a small, microconch, form thought to be male. In most aspects the microconch is simply a smaller version of the macroconch. The primary difference lies in the aperture, which in the microconch has planar extensions on either side, lappets. That of the macroconch is generally simple, preceded by a constriction. Kingdom: Animalia Pylum: Mollusca Class: Cephalopoda Order: †Ammonitida Family: † Stephanoceratidae -
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From the album: MY FOSSIL Collection - Dpaul7
Stephanoceras (Normannites) sp. Ammonite Bajocian, Morocco Jurassic period ( 201.3 -145 million years ago) Stephanoceras (meaning crown horn) is an extinct genus of Stephanoceratoid ammonite which lived during the Bajocian (Middle Jurassic). It is the type genus of the family Stephanoceratidae. Stephanoceras has an evolute shell, as characteristic of the family, with well-developed ribbing and tubercles. The shell is coiled so whorls barely touch in most, but some have notable overlap. Primary ribs emerge from the umbilical seam, the line marking the inner edge of the particular exposed whorl, and divide on the flanks, usually in two, occasionally in three, forming secondary ribs that cross the outer rim of the shell, known as the venter, uninterrupted. Turbercles, elevated projections, form at the ends of the primary ribs where they bifurcate or sometimes trifurcate. Stephanoceras grew to be fairly large with a shell diameter as much as 27 cm and width as much as 6 cm across the outer whorl. Like many ammonites, Stephanoceras is dimorphic with a large, macroconch, form thought to be female and a small, microconch, form thought to be male. In most aspects the microconch is simply a smaller version of the macroconch. The primary difference lies in the aperture, which in the microconch has planar extensions on either side, lappets. That of the macroconch is generally simple, preceded by a constriction. Kingdom: Animalia Pylum: Mollusca Class: Cephalopoda Order: †Ammonitida Family: † Stephanoceratidae -
From the album: MY FOSSIL Collection - Dpaul7
Pleydellia sp. Ammonite Bajocian, Morocco Jurassic period ( 201.3 -145 million years ago) Hildoceratidae is a family of ammonoid cephalopods from the Lower Jurassic, lower Pliensbachian (Jamesoni zone) to lower Bajocian (maybe even upper Bajocian) substages, generally with strongly ribbed, involute shells. They are combined with the Hammatoceratidae (= Phymatoceratidae), Graphoceratidae, and Sonniniidae to make up the Hildoceratoidea. Kingdom: Animalia Pylum: Mollusca Class: Cephalopoda Order: †Ammonitida Family: †Hildoceratidae Genus: †Pleydellia -
From the album: MY FOSSIL Collection - Dpaul7
Pleydellia sp. Ammonite Bajocian, Morocco Jurassic period ( 201.3 -145 million years ago) Hildoceratidae is a family of ammonoid cephalopods from the Lower Jurassic, lower Pliensbachian (Jamesoni zone) to lower Bajocian (maybe even upper Bajocian) substages, generally with strongly ribbed, involute shells. They are combined with the Hammatoceratidae (= Phymatoceratidae), Graphoceratidae, and Sonniniidae to make up the Hildoceratoidea. Kingdom: Animalia Pylum: Mollusca Class: Cephalopoda Order: †Ammonitida Family: †Hildoceratidae Genus: †Pleydellia-
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From the album: MY FOSSIL Collection - Dpaul7
Phlycticeras sp. Ammonite Bajocian, Morocco Jurassic period ( 201.3 -145 million years ago) The Strigoceratidae is a family in the ammonitid superfamily Haploceratoidea, restricted to the lower Middle Jurassic, Bajocian stage, possibly derived from the Hammitoceratidae. The family was established and named by Buckman in 1924. The shells of the Strigoceratidae are compressed to oxyconic, with a narrow or minute umbilicus and simple or irregularly branched ribbing almost confined to the outer (ventral) half of the whorl sides. The sutures are moderately simple to complex, with a long umbilical lobe bearing a graded series of Auxiliaries. Kingdom: Animalia Pylum: Mollusca Class: Cephalopoda Order: †Ammonitida Family: †Strigoceratidae Genus: †Phlycticeras -
From the album: MY FOSSIL Collection - Dpaul7
Phlycticeras sp. Ammonite Bajocian, Morocco Jurassic period ( 201.3 -145 million years ago) The Strigoceratidae is a family in the ammonitid superfamily Haploceratoidea, restricted to the lower Middle Jurassic, Bajocian stage, possibly derived from the Hammitoceratidae. The family was established and named by Buckman in 1924. The shells of the Strigoceratidae are compressed to oxyconic, with a narrow or minute umbilicus and simple or irregularly branched ribbing almost confined to the outer (ventral) half of the whorl sides. The sutures are moderately simple to complex, with a long umbilical lobe bearing a graded series of Auxiliaries. Kingdom: Animalia Pylum: Mollusca Class: Cephalopoda Order: †Ammonitida Family: †Strigoceratidae Genus: †Phlycticeras -
From the album: MY FOSSIL Collection - Dpaul7
Hypophylloceras tethys Ammonite Bajocian, Morocco Jurassic period ( 201.3 -145 million years ago) Hypophylloceras is a Cretaceous ammonite with a finely ribbed, compressed, involute shell; some having periodic stronger ribs or folds. The suture is complex, with large, asymmetric and finely divided lobes; the 1st lateral being much larger than the external (=ventral) and 2nd lateral lobes. Saddle endings commonly not phylloid. Kingdom: Animalia Pylum: Mollusca Class: Cephalopoda Order: †Ammonitida Family: †Phylloceratidae Genus: †Hypophylloceras Species: †tethys -
From the album: MY FOSSIL Collection - Dpaul7
Hypophylloceras tethys Ammonite Bajocian, Morocco Jurassic period ( 201.3 -145 million years ago) Hypophylloceras is a Cretaceous ammonite with a finely ribbed, compressed, involute shell; some having periodic stronger ribs or folds. The suture is complex, with large, asymmetric and finely divided lobes; the 1st lateral being much larger than the external (=ventral) and 2nd lateral lobes. Saddle endings commonly not phylloid. Kingdom: Animalia Pylum: Mollusca Class: Cephalopoda Order: †Ammonitida Family: †Phylloceratidae Genus: †Hypophylloceras Species: †tethys -
From the album: MY FOSSIL Collection - Dpaul7
Holcophylloceras mediterraneum Ammonite Phlycticeras sp. Ammonite Bajocian, Morocco Jurassic period ( 201.3 -145 million years ago) Phylloceratidae is the predominant family of the Phylloceratina with some 15 or more genera found in rocks ranging from the Lower Jurassic to the Upper Cretaceous. Members of the Phylloceratidae are characterized by smooth, involute shells with very thin walls. Many are covered with fine growth lines but are usually without ribbing. Sutures are complex with the major and minor branches of the saddles with phylloid or spatulate endings. The Phylloceratidae are probably derived from the Late Triassic Discophyllitidae by increasing the sutural complexity and evolving involute coiling. The Discophyllitidae in tern have their origin in the Ussuritidae, also known as the Monophyllitidae. The Phylloceratidae gave rise at or near the beginning of the Jurassic to the ancestral Lytoceratina, the early Lower Jurassic Peluroacanthitidae and Ectocentridae. The Phyloceratidae also gave rise at or near the beginning of the Jurassic to the Psiloceratoidea which unites families of the Early Jurassic Ammonitina. Other Jurassic Ammonitina are derived from the Lytoceratina. Later, phylloceratids are said to have given rise to Cretaceous Ammonitina included in the Desmoceratoidea, Hoplitoidea, and Acanthoceratoidea. Kingdom: Animalia Pylum: Mollusca Class: Cephalopoda Order: †Ammonitida Family: †Phylloceratidae Genus: †Holcophylloceras -
From the album: MY FOSSIL Collection - Dpaul7
Holcophylloceras mediterraneum Ammonite Phlycticeras sp. Ammonite Bajocian, Morocco Jurassic period ( 201.3 -145 million years ago) Phylloceratidae is the predominant family of the Phylloceratina with some 15 or more genera found in rocks ranging from the Lower Jurassic to the Upper Cretaceous. Members of the Phylloceratidae are characterized by smooth, involute shells with very thin walls. Many are covered with fine growth lines but are usually without ribbing. Sutures are complex with the major and minor branches of the saddles with phylloid or spatulate endings. The Phylloceratidae are probably derived from the Late Triassic Discophyllitidae by increasing the sutural complexity and evolving involute coiling. The Discophyllitidae in tern have their origin in the Ussuritidae, also known as the Monophyllitidae. The Phylloceratidae gave rise at or near the beginning of the Jurassic to the ancestral Lytoceratina, the early Lower Jurassic Peluroacanthitidae and Ectocentridae. The Phyloceratidae also gave rise at or near the beginning of the Jurassic to the Psiloceratoidea which unites families of the Early Jurassic Ammonitina. Other Jurassic Ammonitina are derived from the Lytoceratina. Later, phylloceratids are said to have given rise to Cretaceous Ammonitina included in the Desmoceratoidea, Hoplitoidea, and Acanthoceratoidea. Kingdom: Animalia Pylum: Mollusca Class: Cephalopoda Order: †Ammonitida Family: †Phylloceratidae Genus: †Holcophylloceras -
From the album: MY FOSSIL Collection - Dpaul7
Hildoceras sp. Ammonite Bajocian, Morocco Jurassic period ( 201.3 -145 million years ago) Hildoceras is a genus of ammonite from the Jurassic era in the family Hildoceratidae. The shells are characterized by a narrow discoidal evolute shape, keeled venter, concave ribs along the outer flanks, and a shallow spiral goove running along smooth inner flanks. Whorls slightly overlap, cross sections are compressed. The ventral keel is bordered on either side by a shallow groove. The genus was named by Alpheus Hyatt after Saint Hilda in 1876. Hildoceras bifrons is an extinct species of ammonite in the family Hildoceratidae. It dates from about 175 million years ago in the Early Jurassic when it was both widespread and common. Fossils have been found in North Africa and Europe, including several regions of England. Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Order: †Ammonitida Family: †Hildoceratidae Genus: †Hildoceras -
From the album: MY FOSSIL Collection - Dpaul7
Hildoceras sp. Ammonite Bajocian, Morocco Jurassic period ( 201.3 -145 million years ago) Hildoceras is a genus of ammonite from the Jurassic era in the family Hildoceratidae. The shells are characterized by a narrow discoidal evolute shape, keeled venter, concave ribs along the outer flanks, and a shallow spiral goove running along smooth inner flanks. Whorls slightly overlap, cross sections are compressed. The ventral keel is bordered on either side by a shallow groove. The genus was named by Alpheus Hyatt after Saint Hilda in 1876. Hildoceras bifrons is an extinct species of ammonite in the family Hildoceratidae. It dates from about 175 million years ago in the Early Jurassic when it was both widespread and common. Fossils have been found in North Africa and Europe, including several regions of England. Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Order: †Ammonitida Family: †Hildoceratidae Genus: †Hildoceras -
From the album: MY FOSSIL Collection - Dpaul7
Emileia sp. Ammonite Bajocian, Morocco Jurassic period ( 201.3 -145 million years ago) Emileia is an extinct genus from a well-known class of fossil cephalopods, the ammonites, that lived during the early part of the Bajocian. Emileiais a large form with fine ribbing that includes may secondaries. It begins as a barrel shaped cadicone, with an eccentric, more or less smooth body chamber. Emileia is included in the family Otoitidae and superfamily Stephanoceratoidea of the Ammonitina. Kingdom: Animalia Pylum: Mollusca Class: Cephalopoda Order: †Ammonitida Family: †Otoitidae Genus: †Emileia -
From the album: MY FOSSIL Collection - Dpaul7
Emileia sp. Ammonite Bajocian, Morocco Jurassic period ( 201.3 -145 million years ago) Emileia is an extinct genus from a well-known class of fossil cephalopods, the ammonites, that lived during the early part of the Bajocian. Emileiais a large form with fine ribbing that includes may secondaries. It begins as a barrel shaped cadicone, with an eccentric, more or less smooth body chamber. Emileia is included in the family Otoitidae and superfamily Stephanoceratoidea of the Ammonitina. Kingdom: Animalia Pylum: Mollusca Class: Cephalopoda Order: †Ammonitida Family: †Otoitidae Genus: †Emileia -
From the album: MY FOSSIL Collection - Dpaul7
Cardioceras sp. Ammonite Bajocian, Morocco Jurassic period ( 201.3 -145 million years ago) Cardioceras is an extinct ammonite genus belonging to the family Cardioceratidae. These fast-moving nektonic carnivores lived during the Jurassic period, Oxfordian age. Shells of Cardioceras species can reach a diameter of 20–25 millimetres (0.79–0.98 in). The shape is circular, with ribs and a prominent ridge along the dorsal edge. Kingdom: Animalia Pylum: Mollusca Class: Cephalopoda Order: †Ammonitida Family: †Cardioceratidae Genus: †Cardioceras -
From the album: MY FOSSIL Collection - Dpaul7
Cardioceras sp. Ammonite Bajocian, Morocco Jurassic period ( 201.3 -145 million years ago) Cardioceras is an extinct ammonite genus belonging to the family Cardioceratidae. These fast-moving nektonic carnivores lived during the Jurassic period, Oxfordian age. Shells of Cardioceras species can reach a diameter of 20–25 millimetres (0.79–0.98 in). The shape is circular, with ribs and a prominent ridge along the dorsal edge. Kingdom: Animalia Pylum: Mollusca Class: Cephalopoda Order: †Ammonitida Family: †Cardioceratidae Genus: †Cardioceras
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