Prolateral view of left bulb in Thaiderces species A T. jian B T. ngalauindahensis sp. nov. C T. peterjaegeri sp. nov. D T. tuoyuan sp. nov. E T. yangcong sp. nov. F T. fengniao sp. nov. Ventral view of the bulb in Thaiderces species G T. vulgaris H T. ganlan sp. nov. I T. thamphadaengensis sp. nov. J T. shuzi sp. nov. K T. thamphrikensis sp. nov. L T. haima sp. nov. Abbreviations: LA, laminal apophysis, ST, stubble. A, G Modified from Liu et al. (2017).