Oddball Fishes Other Strange Creatures Of The Deep
Oddball Fishes Other Strange Creatures Of The Deep Book in PDF, ePub and Kindle version is available to download in english. Read online anytime anywhere directly from your device. Click on the download button below to get a free pdf file of Oddball Fishes Other Strange Creatures Of The Deep book. This book definitely worth reading, it is an incredibly well-written.
Ontogeny, Intraspecific Variation, and Systematics of the Late Cambrian Trilobite Dikelocephalus by Nigel C. Hughes Pdf
Biometric analyses of well-localized specimens of the trilobite Dikelocephalus from the St. Lawrence Formation (Upper Cambrian), northern Mississippi Valley, suggest that all specimens belong to a single, highly variable morphospecies, D. minnesotensis. A complex pattern of ontogenetically-related and ontogeny-independent variation produced a mosaic of morphotypes, which show greater diversity than previously recorded within trilobite species. There is considerable variation within collections made from single beds. Variations of characters among collections are mosaic, and are clinal in some cases. Patterns of variation within Dikelocephalus cannot be related to lithofacies occurrence. There are no obvious temporal variations in D. minnesotensis within the St. Lawrence Formation, but some Dikelocephalus from the underlying Tunnel City Group may belong to a different taxon. The validity of this early taxon is questionable due to a lack of available material. The mosaic pattern of variation in Dikelocephalus mimics that documented at higher taxonomic levels in primitive libristomate trilobites, and helps explain difficulties in providing a workable taxonomy of primitive trilobites. Results caution proposition of evolutionary scenarios that do not take account of intraspecific variation. The recovery of dorsal shields of Dikelocephalus permits the first detailed reconstruction of the entire exoskeleton. The systematics of the genus is revised and twenty-five species are suppressed as junior synonyms of D. minnesotensis.
The Strangest Thing in the Sea by Rachel Poliquin Pdf
A wonderfully weird book about the strangest creatures in the sea. A feathery tutu dancing through the water? A tiptoeing rock wearing a wig? Not everything is as it seems in this fascinating exploration of bizarre sea animals. Each creature is introduced with intriguing art and text, and the question, “Am I the strangest thing in the sea?” Open the gatefold, and the actual creature in its habitat and a full description appear, along with the answer: No, it’s not the strangest thing in the sea. That is, until the last creature, which is the strangest. But what could it be? What’s cooler than bizarre things that are real? Kids will want to dive right in!