|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Orthothecida - Circothecidae
It was assigned to Calyptoptomatida by Duan (1984); to Orthothecida by Landing and Bartowski (1996); to Circothecida by Sepkoski (2002); to Coleolidae by Malinky and Skovsted (2004); and to Circothecidae by Rozanov et al. (1969), Azmi and Pancholi (1983), Bengtson et al. (1990) and Parkhaev and Demidenko (2010).
|Year||Name and author|
|1969||Conotheca Rozanov et al. pp. 134-135|
|1969||Edgetheca Rozanov et al. p. 142|
|1983||Conotheca Azmi and Pancholi p. 368|
|1984||Conotheca Duan p. 162|
|1990||Conotheca Bengtson et al. p. 213|
|1996||Conotheca Landing and Bartowski p. 756|
|2002||Conotheca Sepkoski, Jr.|
|2004||Conotheca Malinky and Skovsted p. 570|
|2010||Conotheca Parkhaev and Demidenko p. 931|
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|J. M. Malinky and C.B. Skovsted 2004||Shell conical with circular cross−section and
transverse elements of sculpture on the exterior; aperture pla−
nar and operculum with cardinal processes and circular
ridges on interior.
|P. Y. Parkhaev and Y. Demidenko 2010||"Narrow conical shell with circular cross-section. Initial part of shell slightly swollen. Aperture straight or almost straight. Ornamentation represented by prominent growth lines."|