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The Cambrian Fossils of Chengjiang, China: The Flowering of Early Animal Life
The Chengjiang Biota is a model for the future distribution and Evolutionary Setting of Phylum Uncertain, which will help clarify the role of “superficial”organisms in the evolution of species. Expand
The Cambrian Fossils of Chengjiang, China
The Cambrian fossils of Chengjiang, China , The Cambrian fossils of Chengjiang, China , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
Early Silurian oceanic episodes and events
Biotic cycles in the early Silurian correlate broadly with postulated sea-level changes, but are better explained by a model that involves episodic changes in oceanic state. Primo episodes wereExpand
The conodont animal
A unique specimen of a small, elongate, soft-bodied animal from the Lower Carboniferous of the Edinburgh district, Scotland, is described. The head expands anteriorly into two lobate structuresExpand
This work introduces new terms for orientation in conodonts and their elements, and a modified scheme of anatomical notation, which can be applied rigorously to all taxa that are known from natural assemblages or where an hypothesis of topological homology can be inferred from secondary morphological criteria. Expand
Restudy of conodont zonation and evolution across the P/T boundary at Meishan section, Changxing, Zhejiang, China
Abstract Large conodont samples have been collected from the uppermost Permian and lowermost Triassic (beds 24–29) at the Meishan section — the Global Stratotype Section and Point (GSSP) for theExpand
Conodont affinity and chordate phylogeny
It is concluded that conodonts are cladistically more derived than either hagfishes or lampreys because they possess a mineralised dermal skeleton and that they are the most plesiomorphic member of the total group Gnathostomata. Expand
The Systematics and phylogenetic relationships of vetulicolians
It is not possible on current evidence to reach an unequivocal conclusion regarding the phylogenetic position of vetulicolians, but one possibility is that they are a sister group of arthropods that lost limbs but gained gill structures analogous to those of deuterostomes, but several features remain unexplained by this model. Expand
Ludlow (late Silurian) oceanic episodes and events
Biotic and sedimentological cycles in the late Silurian are closely similar to those recognized in the early Silurian. They are explained here by alternations between primo and secundo conditions,Expand