Alternative spelling: Theelidae
Full reference: D. L. Frizzell and H. Exline. 1955. Monograph of fossil holothurian sclerites. Bulletin of the Missouri University School of Metallurgy and Mines, Technical series 89:1-204
Parent taxon: Holothuroidea according to K. Krainer and H. Mostler 1997
See also Carini 1962, Deflandre-Rigaud 1957, Frizzell and Exline 1955, Frizzell and Exline 1966, Gilliland 1992, Gutschick 1959, Kozur and Mostler 1989, Langenheim and Epis 1957, Mostler 1972, Mostler and Rahimi-Yazd 1976, Pawson 1966, Summerson and Campbell 1958 and Wernlund 1977
Sister taxa: Acanthocaudina, Achistrulidae, Alexandritidae, Apodacea, Apodida, Arthrochirota, Arthrochirotida, Aspidochirotacea, Aspidochirotida, Bogschites, Calcancorellidae, Canisiidae, Chiridotitidae, Conisia, Crucivirga, Dactylochirotida, Dendrochirotacea, Dendrochirotida, Elasipodida, Etheridgellidae, Harinellites, Irinella, Kaliobullitidae, Kozurellidae, Kuehnitidae, Laetmophasma, Leptosynapta, Molpadiida, Ocellothuria, Palelpidiidae, Paractinopoda, Placerotapis, Priscopedatidae, Protocaudinidae, Punctatitidae, Rotiformidae, Sclerothurites, Semperitidae, Stichopitidae, Synaptellidae, Tetravirga, Thyonidium, Triradites
Subtaxa: Jumaraina Lawsonina Micradites Neomicroantyx Protheelia Schizotheelia Stueria Swabiaina
Type: Theelia
Ecology: shallow infaunal detritivore
Distribution:
• Oligocene of Germany (1 collection), United States (1: California)
• Eocene of France (1)
• Cretaceous of Germany (2)
• Jurassic of Austria (1), France (1), India (2), Poland (8), Switzerland (1)
• Triassic of Austria (2), Italy (3), Slovakia (8), Slovenia (1), Turkey (2)
• Permian of Germany (1)
Total: 35 collections including 39 occurrences