Abstract
Two Surirella species from China are studied using light and scanning electron microscopy. Surirella wulingensis sp. nov., discovered from Li River (located in Wuling Mountains, China), bears five undulations from pole to pole throughout the whole valve diminution series and parallel valve margins, which differ from other similar taxa. Based on the observations of the fine structure, an amended description is provided for S. tientsinensis which possesses a unique character within the genus Surirella: rounded and rimmed outer openings of areolae. Three new morphological terms are proposed: costa-stria bundle (CSB), over-fibula costa (OFC), and mantle sinking against a fibula (MSAF), which can be used for describing some Surirella taxa more succinctly and explicitly including these taxa in this study.
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