Shell structure in Mesozoic Articulate brachiopodsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Mesozoic brachiopods are devided into two groups of different microstructure. The orders
Rhynchonellida and Terebratulida form the larger group with a standart type of secretory
activity (Williams, 1968). Their ventral and dorsal valves are similar in structure, mostly doublelayer,
with sporadically developed tertiary prismatic layer. The order Thecideida belongs to a
smaller group with nonstandard secretory activity, their ventral and dorsal valves differ in
microstructure of both valves changed during the Mesozoic and Cenozoic. There are two types
of fibrous layer for the order Rhynchonellida: rhynchonellid type for superfamily
Rhynchonelloidea and basiliolid type for superfamily Basilioloidea, that differ by the size and
shape of transverse sections of fibres (Kamyshan, 1977). On observed the tendence of decrease
of fibres size during Mesozoic and Cenozoic (Kamyshan, 1977, Smirnova, 1984). The size of fibres
differs into superfamilies of order Terebratulida: it is smaller into Terebratuloidea comparing of
superfamily Dallinoidea (Smirnova, 1984). Terebratulides the same as rhynchonellides have the
tendency of decreasing of the fibres size during Mesozoic-Cenozoic (Gaspard, 1990). Into order
Thecideida the two-layers shell in Triass and Jura was replaced into shell with one layer at the
end of the Early Cretaceous.