First report of the family Ideoroncidae (Arachnida, Pseudoscorpiones) from China, with description of a new species

Abstract Background The pseudoscorpion genus Shravana Chamberlin, 1930, belonging to the family Ideoroncidae Chamberlin, 1930, currently contains 13 species. To date, no ideoroncid species has been recorded from China. New information The family Ideoroncidae Chamberlin, 1930 is reported from China for the first time. A new species of the genus Shravana Chamberlin, 1930, collected from Xizang Autonomous Region, China, is described under the name of Shravanazhui Gao & Zhang, sp. nov. on the basis of both sexes. The finding of this new species expands the distribution range of this family in Asia.


Introduction
The pseudoscorpion family Ideoroncidae was first recognised by Chamberlin (1930) and is discontinuously distributed around the world.To date, the family currently includes 84 modern species in 14 recognised genera, distributed in the Americas, Africa and Asia.Amongst them, three occur in south-eastern Asia: Dhanus Chamberlin, 1930, Shravana Chamberlin, 1930and Sironcus Harvey, 2016 (Harvey and Muchmore 2013, Harvey and Gerhard 2014, Harvey 2016, WPC 2022).
The genus Shravana was erected by Chamberlin (1930), It contains 13 species, which are distributed sporadically throughout Asia and the Socotran Archipelago (Harvey 2016, WPC 2022).
Due to a lack of comprehensive fieldwork, up to the present, no Shravana species has been reported from China.Shravana zhui sp.nov. is presented here as a representative of the family Ideoroncidae recorded in China for the first time.

Materials and methods
The specimens are preserved in 75% alcohol and deposited in the Museum of Hebei University (MHBU) (Baoding, China).Photographs were taken with a Leica M205a stereomicroscope, equipped with a Leica DFC550 camera and the LAS software v. 4.6 and the Leica M205A stereomicroscope with a drawing tube was used for drawings and measurements.All measurements are given in mm unless noted otherwise.The chela and the chelal hand were measured in the ventral view.Detailed examination was carried out with an Olympus BX53 general optical microscope.Temporary slide mounts were made in glycerol.
Terminology and mensuration largely follow Chamberlin (1931), except for the nomenclature of the pedipalps, legs and with some minor modifications to the terminology of the trichobothria (Harvey 1992), chelicera (Harvey andEdward 2007, Judson 2007) and faces of the appendages (Harvey et al. 2012).The notation of the supernumerary trichobothria follows Mahnert (1984).
Setae: generally long, straight or slightly curved and acicular.

Comparison:
The new species share the character of presence of only two trichobothria in the b region with S. pohli (Mahnert, 2007) and S. socotraensis (Mahnert, 2007); it differs from them by the presence of 21 trichobothria on the fixed chelal finger and hand, whereas S. pohli has 23-24, S. socotraensis has only 20 trichobothria (Mahnert 2007, Harvey 2016)

Diagnosis
For the diagnosis for the genus Shravana, see Harvey (2016).This new species differs from all the other members of the genus Shravana by the following combination of characteristics: thin lamina exterior present, arolia without a ventral hook and slightly longer than the claws; 21 trichobothria on chelal fixed fingers, 10 on movable fingers, two trichobothria in the b region of the chela; tergites and sternites undivided, white spot on each lateral side of sternites V-IX; the presence of 34 setae on the carapace, include four near anterior margin, six near the posterior margin, with shallow posterior furrow; slender chela (femur 4.73 times, patella 4.05 times longer than broad); cheliceral palm with six simple setae.

Etymology
This species is named in memory of Prof. Mingsheng Zhu (1950-2010), a famous arachnologist from China, who made a great contribution to the study of Chinese arachnology.First report of the family Ideoroncidae (Arachnida, Pseudoscorpiones) from ...

Distribution
The new species is known only from Xizang Region, China.

Notes
Shravana zhui sp.nov. is the first member of family Ideoroncidae to be discovered in China, which expanded the distribution range of this family in Asia; two specimens were collected on the wet inner side under stones at a relatively higher elevation (3062 m).