Fig. 5

L. undulata n. sp., valvocopula (a–e) and 4th pleura (f–h) in SEM. a Closed end of valvocopula with a narrow septum and midrib near abvalvar margin. b Mid part of band showing transition of midrib toward the advalvar margin, advalvar striae becoming shorter toward the base. c, d More basal portions of the band showing lack of advalvar striae. e Open end of valvocopula. f–h A 4th pleura showing apical cap and portion of band with single row of pores throughout the whole band. Scale bars: a–e, g, 5 μm, f, h, 2.5 μm