|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Rhynchonellata - Orthida - Dalmanellidae
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.
|A. Williams 1962||Small, unequally biconvex Paucicrura with a slightly shallower brachial valve beating a sharp, deep, median sulcus; outline subcircular and closely comparable with P. sila; ornamentation costellate and like that of P. sila except that costa 1 is median, situated within the cleft of the sulcus and without external secondaries at the 2-mm. growth-stage; internal morphology similar to that of P. sila except for a rather smaller dorsal adductor scar averaging slightly more than one-third the length of the brachial valve.|