Abstract
Three new species of Hannaea Patrick from the Hengduan Mountains in China are formally described herein, based on light and scanning electron microscope observations. Hannaea yalaensis sp. nov. has three continuous inflations along the ventral margin, resulting in an undulate outline compared to the outline of the most commonly reported Hannaea species. The valve of Hannaea hengduanensis sp. nov. is narrower, asymmetrical about the apical axis with capitate apices, dorsal and ventral sides almost parallel. On the ventral side of valve is an unornamented central area. The valve of Hannaea clavata sp. nov. is clavate. Valve margin is straight or slightly curved. The apices of the valve constrict sharply to form the capitate ends. In addition, we also briefly described other Hannaea from this region. Here, we document the morphologies of these new species and discuss the biogeographic distribution of the genus Hannaea in Asia.
Acknowledgments
We would like to thank Dr. Yue Cao and Bingwei Xing for help in the field and with sample collection. We thank LetPub (www.letpub.com) for its linguistic assistance during the preparation of this manuscript. RJB initially served as associate editor, but because she subsequently shared original data and analyses for this paper we include her as an author. Two reviewers provided valuable feedback.
Disclosure statement
No potential conflict of interest was reported by the author(s).