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Aptychi are reported from the Lower Aalenian Leioceras opalinum Zone and Subzone of the Khussa-Kardonik section in Karachay-Cherkessia (Kuban River Basin). They are associated with conchs of the ammonites genera Leioceras and Bredyia (superfamily Hildoceratoidea) and interpreted as their lower jaws. The Hildoceratoidea aptychi are referred to a form group defined by Trauth as ‘cornaptychi’. Wide valves...
Limpet-like and non-mineralized fossils from the upper Kimmeridgian Nusplingen Plattenkalk are identified as internal shells of coleoid cephalopods, more specifically as octobrachian gladii. The significantly reduced median field provokes us to consider this new gladius type to be shorter than the mantle length. It is consequently seen as a vestigial gladius. The first recognition of an unpaired gladius...
The recent recognition of the earliest Andean Tithonian ammonite fauna (Picunleufuense Zone) has allowed a balanced classification of the ataxioceratid ammonites, reflecting their phylogenetic relationships. The Picunleufuense Zone fauna, first recognized in the Neuquén Basin at the base of the Vaca Muerta Formation, is represented by numerous records of sparse ammonite faunas from Antarctica, the...
The body chamber of an ammonoid of the genus Calliphylloceras (Suborder Phylloceratina) containing its lower jaw is reported from the Upper Bajocian (Strenoceras niortense Zone) of the Northern Caucasus. The arrangement, state of preservation, and size of the lower jaw suggest preservation in situ. The general morphology of the lower jaw strongly resembles the chitinous inner lamella of the aptychus-type...
A second species of the previously monotypic lobster genus Stenodactylina Beurlen, 1928, Stenodactylina rogerfurzei n. sp. is recorded from the upper Aalenian of the Wutach area (Baden-Württemberg, SW Germany). Like the type species, Stenodactylina liasina Beurlen, 1928, the new species is based only on a single chela. Originally the type horizon of S. liasina was erroneously reported as being late...
The higher rank systematics of coleoid cephalopods are primarily based on the total number of arms. Completely preserved arm crows are, therefore, the most important character complex by which fossil representatives can be assigned to higher taxa. Whereas belemnoids—similar to modern Decabrachia—are well-known to have ten hooklet-bearing arms, recent studies have shown that Middle-Late Jurassic and...
A new demospongid genus and species is described from the Upper Jurassic (Lower Tithonian) Plattenkalk of Langenaltheim near Solnhofen/Bavaria. Both the morphology and the spiculation of the new taxon Neochoiaella frattigianii n. gen. n. sp., which lacks a rigid skeleton, resemble the Early Cambrian family Choiidae de Laubenfels, 1955, particularly the genus Choiaella Rigby and Hou, 1995 from the...
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