ABSTRACT
Two new genera and species of Ithonidae, i.e. Stictopolystoechotes sparsulus Gao, Xu et Wang gen. et sp. nov. and Pycnopolystoechotes striatus Gao, Xu et Wang gen. et sp. nov., are described from the Middle Jurassic Jiulongshan Formation, Inner Mongolia, China. The two new genera can be assigned to the Polystoechotes genus-group of Ithonidae by the combination of following characters: elongated forewing, Sc and RA fused distally, crossveins in radical sector sparse except for the gradate series, and simple CuP branches. The known wing markings among the Jurassic Polystoechotes genus-group were outlined, which suggested the diversification of wing markings was possibly positively associated with the species radiation of this lineage during this period. Moreover, a key to fossil genera of the Polystoechotes genus-group was provided.
LSID: urn:lsid:zoobank.org:pub:CAEEFF67-876D-4709-BE4A-18F5AB04B01D
Stictopolystoechotes: urn:lsid:zoobank.org:act:666ED6B2-B132-4CF4-BFB0-ED6B86EB30F4
Stictopolystoechotes sparsulus: urn:lsid:zoobank.org:act:6C96432B-205F-4F39-A647-3E0048169A92
Pycnopolystoechotes: urn:lsid:zoobank.org:act:1D1343DF-844E-4243-BAB9-242F6232EEBF
Pycnopolystoechotes striatus: urn:lsid:zoobank.org:act:B4EFBE6B-5011-4103-A65F-77D65BEC0B85
Acknowledgments
We sincerely thank Xiaotian Liu and Yurong Jiang (Capital Normal University, Beijing, China) for their technical support.
Disclosure statement
No potential conflict of interest was reported by the author(s).