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Bolboporites: Interpretation Getting Back on Track
AbstractBased on new finds and additional evidence, the interpretation of the enigmatic echinoderm Bolboporites is confirmed; it is a blastozoan...
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Evolution, Functional Morphology and Paedomorphism in the Gogiid-Ascocystitid Lineage (Eocrinoidea; Cambrian-Ordovician)
AbstractGogiid eocrinoids (Lower and Middle Cambrian) are basal echinoderms that document development of pentamerism, origin and emplacement of...
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Ecological Features of Echinoderm Distribution in the Latorp and Volkhov Regional Stages of the Lower and Middle Ordovician of the Leningrad Region
AbstractThe systematic composition and paleoecological distribution of echinoderms in the rocks of the Latorp and Volkhov regional stages of the...
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Two Coils in the Morphology of Myelodactylids (Crinoidea, Disparida): the Morphogenetic Basis of Their Formation and Adaptation Potential
AbstractIn myelodactylids, the coil of the mesostele and the crown with a proxistele coiled in the same plane in the opposite direction result from...
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A New Hybocrinid Genus (Echinodermata, Crinoidea) from the Middle Ordovician of Ladoga Glint on the Volkhov River
AbstractThe hybocrinid crinoid Trecrinus schmidti gen. et sp. nov. is described from the Middle Ordovician (Uhaku Regional Stage, Darriwilian) of...
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Unbranched Holdfasts of Stemmed Echinoderms from the Ordovician of the Leningrad Region
Abstract —Based on examination of the collection of stemmed echinoderm holdfasts from the Ordovician of the Leningrad Region (Russia), all holdfasts...
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Ordovician Paracrinoids from the Baltic: Key Problems of Comparative Morphology of Pelmatozoan Echinoderms
The erect feeding appendages of paracrinoids, brachioles of typical blastozoans and arms of crinoids are morphologically similar in their terminal...
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Echinoids
Of the five classes of echinoderm (Fig. 6.1), echinoids are the most diverse and well represented, from shallow waters to abyssal depths. The...
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Arms versus brachioles: Morphogenetic basis of similarity and differences in food-gathering appendages of pelmatozoan echinoderms
The similarity in the skeleton model of the brachiolar food-gathering system of Blastozoa and the arm system of Crinozoa, including the apical growth...
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C
the grasshoppers and locusts, a suborder of chewing herbivorous insects in the order Orthoptera; mostly ground-dwelling and stridulatory, with strong...
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A new cornute (Homalozoa: Echinodermata) from the uppermost Middle Cambrian (stage 3, Furongian) from Northern Iran: Its systematics and functional morphology
A new rare nearly bilaterally symmetrical cornute from the Mila Formation, upper Middle–early Late Cambrian (Series 3, Furongian) from northern Iran...
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Modularity and heterochronies in the evolution of metazoa: Paleontological aspect
All organisms are formed of more or less independent elements, modules. Paleontology deals with morphological modules preserved in the fossil state...
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Scleritome
What controls the geometry of the scleritomescleritome mosaic? Does it have any relationship to the rapid, major morphological changes?...
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Oxygen requirements for the Cambrian explosion
Hypoxic tolerance experiments may be helpful to constrain the oxygen requirement for animal evolution. Based on literature review, available data...
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A unique edrioasteroid from the upper Middle Cambrian of Iran, its phylogenetic implications and paleoecology
One of the earliest isorophid edrioasteroids from the upper Middle Cambrian-lower Upper Cambrian (upper part of Series 3-lower part of the Furongian...
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Impact of the Boda Event (Late Ordovician) on High-Latitude Peri-Gondwanan Faunas: An Echinoderm Perspective
During the late Katian, high-latitude peri-Gondwanan regions of the Mediterranean Province displayed a dramatic faunal turnover, closely associated...
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The Fezouata Biota (Central Anti-Atlas, Morocco): Biostratigraphy and Associated Environmental Conditions of an Ordovician Burgess Shale
The Lower Ordovician Fezouata Biota (central Anti-Atlas, Morocco) is the sole exceptionally preserved marine fossil assemblage of Burgess Shale type...
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Stratigraphic and Palaeogeographical Distribution of the Ordovician Eocrinoid Ascocystites Barrande 1887 (Echinodermata, Blastozoa)
All available data on the stratigraphic range, palaeobiogeographical distribution, and systematics of the blastozoan genus Ascocystites...
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Structural aberrations in the cup in cladid crinoids from the carboniferous of the Moscow region
Aberrations of the discrete characters of dorsal cups and arms in the Carboniferous crinoids of the Moscow region, mainly represented in the...