Vol. 58, 2019

(update: 2019.08.06; 09.18)
 

Lynceus amplopedia sp. nov., A New Laevicaudatan Clam Shrimp with Asymmetrically Modified Thoracopods from Yunnan, China (Crustacea: Branchiopoda)

IShusen Shu^1,2,3, Zandra M. S. Sigvardt⁴, Xiaoyong Chen^2,3, Jørgen Olesen⁴, D. Christopher Rogers^5,*, and La-orsri Sanoamuang^1,6,*

¹Applied Taxonomic Research Center, Department of Biology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
²Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences, Yezin, Nay Pyi Taw 05282, Myanmar
³Kunming Institute of Zoology, 650223, Chinese Academy of Sciences, Kunming, China
⁴Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen Ø, Denmark
⁵Kansas Biological Survey and the Natural History Museum (Biodiversity Institute), Kansas University, Kansas 66047-3759, USA. *Correspondence: E-mail: branchiopod@gmail.com
⁶International College, Khon Kaen University, Khon Kaen 40002, Thailand. *Correspondence: E-mail: la_orsri@kku.ac.th

Received 11 May 2019 / Accepted 26 July 2019
Communicated by Benny K.K. Chan

Laevicaudata has a nearly global distribution, but only a few records from China. We present a new Lynceus (Crustacea: Branchiopoda: Laevicaudata) species, Lynceus amplopedia sp. nov., from Yunnan, China, which shows significant left-right differences in some non-clasper thoracopods. It can be distinguished from all congeners by asymmetrically modified thoracopods III–VI. In the ‘explanate modified’ side (usually the left side, occasionally the right) the following modifications are present: endites 4, 5, and endopod enlarged (explanate) (thoracopods III and IV); exopod with 14–15 digitiform processes dorsomedially (thoracopods V and VI); and broad muscular basis (thoracopods III–V). The following modifications are seen in the thoracopods of the opposing ‘spinose modified’ side (usually the right side, occasionally the left): endite 4 with robust, specialized spines medially (thoracopods V and VI); endite 3 elongate protruding (thoracopod VI), and broad muscular basis (thoracopod V). Other unique characters of the new species include: male and female rostrum sinuate, compound eyes protruding, male claspers with endopod constricted, and endite 3 with two scale patches. We suggest the modified thoracopods may be involved in mating and/or respiration. The diversity of Chinese Lynceus is also discussed.

Key words: Laevicaudata, Diversity, New species, Modified thoracopods, Lateral asymmetry.

Citation: Shu S, Sigvardt ZMS, Chen X, Olesen J, Rogers DC, Sanoamuang L. 2019. Lynceus amplopedia sp. nov., a new laevicaudatan clam shrimp with asymmetrically modified thoracopods from Yunnan, China (Crustacea: Branchiopoda). Zool Stud 58:28. doi:10.6620/ZS.2019.58-28.