A new species of the spider genus Selenocosmia (Araneae, Theraphosidae) from Fujian, China

Abstract Background The genus Selenocosmia Ausserer, 1871 includes 39 species. Five species were known from China. This genus has not been found in south-eastern China. New information A new species of the genus Selenocosmia Ausserer, 1871 is described from China: Selenocosmiazhangzhengi Lin, sp. n. from Fujian. Photos and a morphological description of the new species are given. The type specimen of the new species is deposited in the Institute of Zoology, Chinese Academy of Sciences in Beiing (IZCAS).


Introduction
The spider family Theraphosidae Thorell, 1869 includes 1031 species in 153 genera, with 39 species in the genus Selenocosmia Ausserer, 1871 , Li 2020, Yao et al. 2021, Zhao et al. 2022, World Spider Catalog 2021. Selenocosmia can be distinguished ‡ ‡ ‡ from all other Selenocosmiinae genera by the presence of an apical keel reduced and shallow, basal lobe of retrolateral embolus keel reduced or absent; maxillary stridulatory lyra well-developed, lyra setae scimitar-shaped; tibia IV not incrassate and absence of dense penicillate retrolateral setal brushes on tibia and metatarsus IV (Yu et al. 2021).

Materials and methods
All specimens were preserved in 75% ethanol. Spermathecae were cleared in trypsin enzyme solution to dissolve non-chitinous tissues. Specimens were examined under a LEICA M205C stereomicroscope. Photomicroscope images were taken with an Olympus C7070 zoom digital camera (7.1 megapixels). Photographs were stacked with Helicon Focus 6.7.1 and processed in Adobe Photoshop CC 2018.
The terminology used in the text and figures follows Bertani (2000) and Sherwood et al. (2021). All measurements are in millimetres. Eye sizes were measured as the maximum diameter from either the dorsal or frontal view. Leg measurements are given as follows: total length (femur, patella, tibia, metatarsus, tarsus).
Abbreviations: A apical keel; ALE anterior lateral eyes; AME anterior median eyes; BL basal lobe of retrolateral embolus keel; MOA median ocular area; PLE posterior lateral eyes; PME posterior median eyes; PS prolateral superior keel; The type material is deposited in the Institute of Zoology, Chinese Academy of Sciences in Beijing (IZCAS).

Etymology
The species is named after Mr. Zheng Zhang, who collected the type material; noun (name) in genitive case.

Distribution
Known only from the type locality.

Ecology
Retreats in burrows made in soil mixed with gravel, the burrows are usually about 3 to 4 cm in diameter. The spider web extends 10 to 20 cm inwards from the burrow. The spider moults inside. At night, the spider waits at the mouth of the burrow for its prey to pass by.