konserwowanie: Lobopodia

Evidence: 100 • authority: 72

Lobopodians are members of the informal group Lobopodia (from Ancient Greek λοβός [lobós] 'lobe' and πόδα [póda] 'foot'), or the formally erected phylum Lobopoda Cavalier-Smith (1998). They are panarthropods with stubby legs called lobopods, a term which may also be used as a common name of this group as well. While the definition of lobopodians may differ between literatures, it usually refers to a group of soft-bodied, marine (and freshwater) worm-like fossil panarthropods such as Aysheaia and Hallucigenia. However, other genera like Kerygmachela and Pambdelurion (which have features similar to other groups) are often referred to as "gilled lobopodians". The oldest near-complete fossil lo…

Evidence: 59 • authority: 72

The Waukesha Biota (also known as Waukesha Lagerstätte, Brandon Bridge Lagerstätte, or Brandon Bridge fauna) is an important fossil site located in Waukesha County and Franklin, Milwaukee County within the state of Wisconsin. This biota is preserved in certain strata within the Brandon Bridge Formation, which dates to the early Silurian period. It is known for the exceptional preservation of soft-bodied organisms, including many species found nowhere else in rocks of similar age. The site's discovery was announced in 1985, leading to a plethora of discoveries. This biota is one of the few well studied Lagerstätten (exceptional fossil sites) from the Silurian, making it important in our unde…

Evidence: 52 • authority: 80

Oldest known fossil of Rossellids (Hexactinellida, Porifera) from the Ordovician–Silurian transition of Anhui, South China

Evidence: 45 • authority: 80

Description of some cores from Cambrian and Lower Ordovician strata of Saskatchewan

Evidence: 38 • authority: 80

Uppermost Cambrian and Lower Ordovician acritarchs and Lower Ordovician Chitinozoans from Wilcox Pass, Alberta

Evidence: 38 • authority: 88

Little known Homerian (lower Silurian) graptolites from kosov quarry near Beroun, the Czech republic. Abstract The Homerian graptolite fauna of the upper Cyrtograptus lundgreni and lower Colonograptus ludensis-Colonograptus gerhardi biozones, recovered from densely sampled sections in Kosov quarry includes several poorly known species, which appear to be useful in high resolution correlation. Gothograptus kozlowskii , Gothograptus aff. domeyki , Semigothograptus meganassa , Pristiograptus auctus , Monograptus ambiguus , Monograptus subflexilis and Cyrtograptus hemmanni are described and discussed in detail with reference to their stratigraphic range and palaeogeographic distribution which i…

Evidence: — • authority: 88

Ordovician and Silurian. During the early Paleozoic, the paleogeography of northern Yukon and adjacent District of Mackenzie was characterized by an intricate and changing pattern of platforms and adjacent troughs. Relatively deep water persisted in the Richardson and Blackstone troughs throughout most of the Late Cambrian to Early Devonian. Carbonate rocks accumulated on shallow shelves and banks that bordered the two troughs, and carbonate sediments were shed into the basinal depositional environments of the troughs. Unconformities are widespread within the carbonate successions of the Mackenzie Arch and the Porcupine Platform and can be detected locally on the Ogilvie Arch. In contrast,…

Evidence: — • authority: 80

Studies of fossil brachiopods of Mongolia: Ordovician, Silurian, Devonian, Carboniferous, and Permian

Evidence: — • authority: 88

A Cambrian fossil from the Chengjiang fauna sharing characteristics with gilled lobopodians, opabiniids and radiodonts. Parvibellus atavus gen. et sp. nov. from the Early Cambrian Chengjiang fauna of China is a small fossil having a distinct cephalic region bearing a pair of lateral projections and a circular, ventral mouth. The trunk bears eleven pairs of probably flap-like appendages and a short pair of terminal projections. This character combination is unique for the Chengjiang biota. A circular ventral mouth is seen in Radiodonta and in some of the gilled lobopodians which are thought to be among the radiodont’s closest relatives. P. atavus , gilled lobopodians, opabiniids, and radiodo…

Evidence: — • authority: 88

DEVELOPMENT AND DIVERSIFICATION OF TRUNK PLATES OF THE LOWER CAMBRIAN LOBOPODIANS. Abstract: Isolated lobopodian plates are reported from Early Cambrian strata at five localities in southern China. A wide variety of morphologies is represented, reflecting a considerable diversification within the phylum at this time. The new taxon Microdictyon jinshaense is erected and new observations are recorded on established taxa, based on examination of more than 600 well‐preserved plates; irregular patterns of node distribution and the presence of large spines are documented on some taxa for the first time. Rare specimens in which two plates are conjoined, with a larger plate underlying a smaller one…

Evidence: — • authority: 88

A Cambrian fossil from the Chengjiang fauna sharing characters with gilled lobopodians and radiodontans. Abstract Background: Lobopodians are worm-like animals with simple legs. Probably representing a grade of organization, rather than an explicit clade, some lobopodians are thought to have given rise to both Euarthropoda and Onychophora (velvet worms). Another subset has been referred to as gilled lobopodians, and are characterized by flap-like appendages along the trunk and large, raptorial forelimbs. These animals probably include the ancestors of another important Cambrian group, the Radiodonta: large predatory or filter-feeding stem-arthropods such as Anomalocaris . Results: Parvibell…

Evidence: — • authority: 72

This is a list of the biota of the Burgess Shale, a Cambrian lagerstätte located in Yoho National Park in Canada. The Burgess Shale is a fossil-bearing deposit exposed in the Canadian Rockies of British Columbia, Canada. It is famous for the exceptional preservation of the soft parts of its fossils. At 508 million years old (middle Cambrian), it is one of the earliest fossil beds containing soft-part imprints. During the Cambrian, the ecosystem of the Burgess Shale sat under 100 to 300 metres (330 to 1000 feet) of water at the base of a submarine canyon known as the Cathedral Escarpment, which today is a part of the Canadian Rockies. The ecosystem would have sat in dimly lit water, most lik…