|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Aculifera - Halkieriidae
It was assigned to Halkieriidae by Poulsen (1967) and Conway Morris and Chapman (1997); to Sachitida by Sepkoski (2002); to Halwaxida by Conway Morris and Caron (2007); and to Halkieriinae by Parkhaev and Demidenko (2010).
|Year||Name and author|
|1981||Dactyosachites He p. 88|
|1981||Microsachites He p. 89|
|1984||Acrosquama Qian and Xiao p. 72|
|1984||Acuminachites Qian and Yin p. 105|
|1997||Halkieria Conway Morris and Chapman p. 8|
|2002||Halkieria Sepkoski, Jr.|
|2007||Halkieria Conway Morris and Caron p. 1258|
|2010||Halkieria Parkhaev and Demidenko p. 985|
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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.
|P. Y. Parkhaev and Y. Demidenko 2010||"Hollow elongated asymmetrical sclerites of three distinct morphotypes, i.e., palmate, cultrate, and siculate types. Each sclerite composed of distinct base and blade, which is several times longer than base. Base usually bent towards lower side of sclerite, forming variable angle with blade. Base usually bears foramen, which often repeat shape of cross-section of sclerite base. Sclerites bent to different extent. Upper surface of sclerite usually convex, bears longitudinal (rarely transversal) ribs and carinae, sometimes ornamented by tubercles. Lower surface flattened or concave, smooth or with transversal striation."|