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Thylacocercus Temporal range: Middle Cambrian
Scientific classification
Kingdom:	Animalia
Superphylum:	Deuterostomia
Phylum:	Echinodermata
Order:	†Vetulocystida
Family:	†Vetulocystidae
Genus:	†Thylacocercus Morris "et al.", 2015
Species:	†T. ignota
Binomial name
Thylacocercus ignota Morris "et al.", 2015

Thylacocercus is a genus of extinct animal close relative to basal echinoderms, which was found in the Wheeler Shale, in the middle Cambrian strata. The genus have one species: Thylacocercus ignota. This is the latest vetulocystid known.

References

Prescov/sandbox Temporal range: Neoproterozoic - Cenozoic
Scientific classification
Kingdom:	Animalia
Phylum:	†Problematica Andrews, 1970
Taxa
see text

Problematica is a fossil taxon of simple animals, commonly called a phylum, which groups taxa with uncertain phylogenetic placement.

Taxa

With 278 taxa.

• Acanthoclava,
• Acidotocarena,
• Acutitheca,
• Aksuglobulus,
• Amoebinella,
• Ampelitocystis,
• Anabaritidae,
• Ancienta,
• Andobolus,
• Animikiea,
• Anzalia,
• Archaeooides,
• Archaeopetasus,
• Archaeorestis,
• Archaeotremaria,
• Archaeozoon,
• Aristophycus,
• Arthroon,
• Artimyctella,
• Ascosyrinx,
• Astropolithon,
• Aurisella,
• Babetosphaera,
• Baccanella,
• Bacinella,
• Bactryllium,
• Bavlinella,
• Beltania,
• Beltina,
• Bensonia,
• Biconulites,
• Bicornifera,
• Bioistodina,
• Blastophycus,
• Botomaella,
• Bovicornellum,
• Caelestites,
• Calcisphaera,
• Cambrocassis,
• Cambroclavida,
• Cambrogeorgina,
• Canninginopsis,
• Caveacus,
• Chabakovia,
• Chalasiocranos,
• Charaussaia,
• Chondropogon,
• Chuaria,
• Clausisphaera,
• Clavitella,
• Coeloscleritophora,
• Coleolidae,
• Coleoloida,
• Coleoloides,
• Cribricyathea,
• Cristatodus,
• Cupithecidae,
• Cyclogeorgina,
• Cycloites,
• Cyrtochites,
• Dentachites,
• Dimorphoconus,
• Dinocardia,
• Dinomischus,
• Dolichomocelypha,
• Draffania,
• Dystachophycus, Ebriella, Ebrinula, Eldoniidae, Emeithella, Emmonsaspis, Enchostoma, Endosacculus, Entosphaeroides, Eoastrion, Eocucumaria, Eoescharopora, Eoglobella, Eosphaera, Etacystis, Eumuensteria, Eurysolenpora, Falsebria, Fensiangia, Fermoria, Flabetheca, Foliaceria, Fomitchella, Forchhammera, Gigartinites, Globuloella, Gochtia, Gorlovella, Granifer, Greysonia, Gymnosolen, Hadrophycus, Haliserides, Harttites, Heliophycus, Henaniodus, Hensonella, Heosomocelypha, Hermesinella, Hermesinopsis, Heterosculpotheca, Himanthalites, Huangshandongella, Huishea, Huizenodus, Humboldtochaeta, Huroniospora, Hydrocytium, Hyphantaenia, Indocera, Isnella, Itieria, Jiangshanodus, Kazakhstanotubulus, Kelyphosphaera, Kiehnensus, Koksodus, Korilacus, Labyrinthotuba, Ladinella, Lenaella, Leptophycus, Leveilleites, Lianophycus, Libodiscus, Licrophycus, Lithostachys, Lochmophycus, Lonchosaccus, Lukatiella, Mabiania, Mamillodus, Manchuriophycus, Marcusodictyon, Margaretia , Maritimella, Martjanowskia, Mawsonella, Medusinites, Meghystrichosphaeridium, Melopetasus, Microancientia, Micromarsupium, Microphycus, Micropylepora, Microschedia, Minjaria, Miratheca, Mitcheldeania, Mitscherlichia, Mobergellidae, Mongoliacus, Mongolitesta, Myxomycites, Nemaphycus, Nematophycus, Nereograpsus, Netrelytron, Nevadatubulus, Newlandia, Nicolarites, Nimbia, Ningqiangsclerites, Niphadus, Oesia, Onuphionella, Palaeobotryllus, Palaeobromelia, Palaeorivularia, Paleocenosphaera, Palhistiodinia, Papillomembrana, Parammodochium, Pararchaeomonas, Pararenicola, Parmites, Paropsonemidae, Parvulonoda, Perichoderma, Phyllochiton, Pilievicutis, Pitella, Platydendron, Plexoramea, Plicatolingula, Plinthokonion, Pollingeria, Poludia, Polycuppes, Polygonosphaerites, Polysiphonides, Polysiphonidia, Poratites, Portalia, Portelia, Praearenaria, Pragmotheca, Primaconulariella, Problematikum, Protoarenicola, Protobolus, Protopterygotheca, Psamathopalass, Pseudokussiella, Pteromidae, Pterpmus, Ptiloncodus, Punctatus, Pyrgites, Pyxolithus, Quadrorites, Radiaxialia, Radiomura, Redkinia, Redoubtia, Resegia, Reticulum, Rhagnura, Rhombodella, Rotadiscidae, Rugatotheca, Sabelliditida, Sagittitheca, Salanacus, Scambocris, Schematophora, Schodackia, Scissotheca, Scolithus, Selenoplax, Seletinicus, Shamovella, Shetlandia, Shinteinella, Siphonema, Solenotia, Sphenopteron, Spinoceras, Spiralella, Spirangium, Spongebria, Spongillopsis, Sporocystis, Spriggia, Stictoconus, Stoibostrombidae, Sutivania, Taitia, Taonurus, Tayshira, Tchangsichiton, Theobaldia, Tintinnoidella, Tommotitubulus, Tridia, Tubigeorgina, Tungussia, Tunudiscus, Turuchania, Tuvinia, Vermiculites, Volborthellida, Wushicites, Yangtzesclerites, Yuliunia, Yunnanodus, Zoogleites