| Tabelliscolex | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Class: | † Palaeoscolecida |
| Family: | † Cricocosmiidae |
| Genus: | † Tabelliscolex |
Tabelliscolex is a genus of palaeoscolecid worm from the Early Cambrian Chengjiang biota that comprises two species, T. hexagonus and T. maanshanensis. [1]
The lobopodians, members of the informal group Lobopodia, or the formally erected phylum Lobopoda Cavalier-Smith (1998), 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, worm-like fossil panarthropods such as Aysheaia and Hallucigenia.
The Maotianshan Shales are a series of Early Cambrian deposits in the Chiungchussu Formation, famous for their Konservat Lagerstätten, deposits known for the exceptional preservation of fossilized organisms or traces. The Maotianshan Shales form one of some forty Cambrian fossil locations worldwide exhibiting exquisite preservation of rarely preserved, non-mineralized soft tissue, comparable to the fossils of the Burgess Shale. They take their name from Maotianshan Hill in Chengjiang County, Yunnan Province, China.
Nectocaris pteryx is a species of possible cephalopod known from the "early Cambrian" Emu Bay Shale and Chengjiang biota, the "middle Cambrian" Burgess Shale.
Markuelia is a genus of fossil worm-like bilaterian animals allied to Ecdysozoa and known from strata of Lower Cambrian to Lower Ordovician age containing five species.
The Emu Bay Shale is a geological formation in Emu Bay, South Australia, containing a major Konservat-Lagerstätte. It is one of two in the world containing Redlichiidan trilobites. The Emu Bay Shale is dated as Cambrian Series 2, Stage 4, correlated with the upper Botomian Stage of the Lower Cambrian.
A number of assemblages bear fossil assemblages similar in character to that of the Burgess Shale. While many are also preserved in a similar fashion to the Burgess Shale, the term "Burgess Shale type fauna" covers assemblages based on taxonomic criteria only.
Facivermis is a genus of sessile lobopodian from the Lower Cambrian Maotianshan shales of China
Deuterostomia are animals typically characterized by their anus forming before their mouth during embryonic development. The group's sister clade is Protostomia, animals whose digestive tract development is more varied. Some examples of deuterostomes include vertebrates, sea stars, and crinoids.
Class Xenusia, the Xenusiids, represents the subset of lobopodian worms that fall in the stem-lineage of Onychophora. Their type genus is Xenusion. They have relatively large, annulated, cylindrical bodies. Their lobopod legs have tubercles at their bases. Some have large frontal appendages, although these may represent taphonomic artefacts. Their mouth is terminal or subterminal, and they are marine. They probably represent a grade rather than a clade.
Ercaicunia is genus of Cambrian arthropod known for being a member of the Chengjiang biota, containing the single species E. multinodosa. It was described by Luo et al in 1999. Specimens were CT scanned in 2019, which revealed it to be a stem-group crustacean.
Kunmingella is genus of Cambrian bradoriid from the Chengjiang biota, containing the single species K. douvillei.
Archaeopriapulida is a group of priapulid-like worms known from Cambrian lagerstätte. The group is closely related to, and very similar to, the modern Priapulids. It is unclear whether it is mono- or polyphyletic. Despite a remarkable morphological similarity to their modern cousins, they fall outside of the priapulid crown group, which is not unambiguously represented in the fossil record until the Carboniferous. They are probably closely related or paraphyletic to the palaeoscolecids; the relationship between these basal worms is somewhat unresolved.
The palaeoscolecids are a group of extinct ecdysozoan worms resembling armoured priapulids. They are known from the Lower Cambrian to the late Silurian; they are mainly found as disarticulated sclerites, but are also preserved in many of the Cambrian lagerstätten. They take their name from the typifying genus Palaeoscolex.
Cricocosmia is a genus of palaeoscolecid worm from the Early Cambrian Chengjiang biota.
Sicyophorus is a genus of archaeopriapulid known from the Chengjiang biota; synonymous with Protopriapulites haikouensis.
Paraselkirkia is a genus of archaeopriapulid known from the Chengjiang biota, resembling Selkirkia.
Palaeoscolex is the type genus of the Palaeoscolecid worms, and served as a wastebasket taxon. until its taxonomy was revised and many of its taxa assigned to Wronascolex.
Shaanxiscolex is an extinct genus of palaeoscolecid worm from the Cambrian Stage 4. The type species is Shaanxiscolex xixiangensis and was named in 2018 by Yang et al.
Onychodictyon is an extinct armored worm known from the Lower Cambrian Chengjiang Maotianshan Shales in the Yunnan Province in China. Onychodictyon's segmented body and stubby non-segmented legs place it in the phylum Lobopodia, which includes several other segmented and free swimming animals such as Microdictyon, Cardiodictyon, Luolishania, and Paucipodia.
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