|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Strophomenata - Strophomenida - Aegiromenidae
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.
|R. B. Zhan et al. 2014||Sericoidea with tiny shell, dense multicostellae, sporadic tubercles in shell anterior part of both valves, well-developed dorsal median septum mainly in shell anterior half.Description: Shell normally less than 2 mm long or wide, elongated semicircular to subcircular in outline, with aver-age length/width ratio of 0.78 and 0.8 for ventral and dorsalvalves respectively, widest along hinge line or slightly in frontof it, gently plano-convex in lateral profile, with dorsal valve nearly flat or slightly concave in its central part and ventral valve deepest in umbonal area; cardinal extremities rounded or rectangular;lateral margin evenly curved, anterior commissure rectimarginate. Interareas of both valves linear, around 0.1 mmin height, and about 6–7 percent of shell length; delthyrium small, covered by arched deltidial plates; notothyrium narrow,small, no apparent chilidium. Ornament of parvicostellae at least of three different sizes, increasing forward mainly by insertions; first order costellae starting from umbo, second order at one-quarter or one-third of shell length, and third order originating in area two-thirds or three-quarters of shell length, sizes also decreasing accordingly; about 5–8 costellae per 0.5 mm alongshell anterior margin. Concentric fila evenly spaced on entireshell surface, about 5–7 per 0.2 mm.|