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Turcutheca Temporal range: Early Cambrian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Brachiopoda
Class:	†Hyolitha
Order:	†Orthothecida (?)
Family:	†Circothecidae
Genus:	†Turcutheca

Turcutheca is a Tommotian (Early Cambrian) genus of shelly fossil whose affinities are uncertain, generally considered as an orthothecid hyolith (which would make it a brachiopod, but also resembling the ellesmeroceratids (early cephalopods).

References

1. ^ Dzik, J. (2010). "Brachiopod Identity of the Alleged Monoplacophoran Ancestors of Cephalopods". Malacologia. 52 (1): 97–113. doi:10.4002/040.052.0107.
2. e.g. Brasier, M. D. (1986). The succession of small shelly fossils (especially conoidal microfossils) from English Precambrian–Cambrian boundary beds. Geological Magazine, 123(3), 237–256. doi:10.1017/S0016756800034737
3. Moysiuk, Joseph; Smith, Martin R; Caron, Jean-Bernard (2017). "Hyoliths are Palaeozoic lophophorates" (PDF). Nature. 541 (7637): 394–397. Bibcode:2017Natur.541..394M. doi:10.1038/nature20804. PMID 28077871.

v t e Notable fossil cephalopods (listed by first occurrence)
Cenozoic	The belemnite-cuttlefish-like Belosaepia	Evolution of cephalopods
Mesozoic	Advanced nautiloids Nautilaceae True ammonites Early coleoids Muensterelloidea Proteroctopus Styletoctopus Keuppia Palaeoctopus Paleocirroteuthis Vampyronassa Ceratitid ammonoids late Nautilida Advanced belemnoids Diplobelids: Diplobelus Belemnites: Belemnites Belemnopsis Belemnotheutis
Palaeozoic	Earliest unambiguous cephalopods: Plectronocerida: Plectronoceras, Monoplacophora-like form: Knightoconus? First appearance of long-lasting lineages Goniatite and ceratite ammonoids Probable coleoid ancestor Bactritida Early coleoids: Jeletzkya?, Gordoniconus, Syllipsimopodi Earliest belemnoids: Aulacocerids Phragmoteuthids Early forms the earliest cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida Spirulid?: Shimanskya
Misidentified	Probable misidentified genera Nectocarididae: (Nectocaris, Nectocotis) Kirengellida Volborthella Shelbyoceras Pohlsepia

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