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

摘要

Laevicaudata has a nearly global distribution, but only a few records from China. Wepresent a new (Crustacea: Branchiopoda: Laevicaudata) species, sp. nov., from Yunnan, China, which showssignificant left-right differences in some non-clasper thoracopods. It can bedistinguished from all congeners by asymmetrically modified thoracopods III–VI. In the‘explanate modified’ side (usually the left side, occasionally the right) the followingmodifications are present: endites 4, 5, and endopod enlarged (explanate) (thoracopods IIIand IV); exopod with 14–15 digitiform processes dorsomedially (thoracopods V and VI); andbroad muscular basis (thoracopods III–V). The following modifications are seen in thethoracopods of the opposing ‘spinose modified’ side (usually the right side, occasionallythe 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 twoscale patches. We suggest the modified thoracopods may be involved in mating and/orrespiration. The diversity of Chinese is also discussed.