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New Species of Sensillonychiurus (Collembola: Onychiuridae: Onychiurinae) in Heilongjiang Province, China

Abstract 
 Two new species, Sensillonychiurus pseudogeminus sp. nov. and Sensillonychiurus zhuajiensis sp. nov., are reported from Heilongjiang Province, China. S. pseudogeminus sp. nov. is very similar to the S. geminus Pomorski & Sveenkova 2006, but it can recognized by shorter unguiculus, longer anal spines and presence of sternal parapseudocelli on Abd. II and Abd. IV instead of pseudocelli. Sensillonychiurus zhuajiensis sp. nov. can easily be distinguished from other known congeners by its peculiar dorsal pso formula (32/144/44453).

The genus Sensillonychiurus Pomorski & Sveenkova 2006 belongs to the tribe Thalassaphorurini as having the furcal remnant with 4 small chaetae arranged in 2 rows posterior to a finely granulated area (Pomorski & Sveenkova 2006). It differs from other genera of the tribe by the following characters: d0 absent, postantennal organ with compound vesicles, guard chaetae in the Ant. III sensory organ as 3-4, Abd. III sternum not subdivided, Abd. V-VI clearly separated, furca reduced to a small area of fine granulations situated adjacent to the border between Abd. III and IV sterna, and tibiotarsi with 7 or 9 distal chaetae (Babenko et al. 2011). Until now, among the 12 known species all over the world, all 3 Chinese species are from Jilin Province (Sun & Wu 2012a;Sun & Wu 2012b;Bellinger et al. 1996Bellinger et al. -2014. During our recent investigations of Collembola from Heilongjiang Province (the highest latitudes and the northernmost region of China), 2 new species of the genus Sensillonychiurus are found. In the present paper, their descriptions and the main diagnostic characters of all known Chinese species of this genus are given.

MATERIAL AND METHODS
Wu Donghui and colleagues collected the studied specimens by Berlese extraction, cleared them in lactic acid and then mounted them in Marc André II solution. They were studied by a Nikon Eclipse 80i microscope. The material is deposited in the Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun.
Labial types are named in accordance with Fjellberg (1999). Labium areas and chaetal nomenclature follow Massoud (1967) andD'Haese (2003). Chaetae on anal valves are named in accordance with Yoshii (1996). Chaetae on the furcal area are classified in accordance with Weiner (1996). Tibiotarsus chaetotaxy formula follows Deharveng (1983), and is expressed as: total number of chaetae (number of chaetae in row C, number of chaetae in row B, number of chaetae in distal row A+T), for example 17 (1, 7, 9).
Known only from the type locality.

Remarks
The new species is very similar to S. geminus Pomorski & Sveenkova, 2006 from Russia (Primorskyi Kray, the easternmost part of Russia) as having the same dorsal pso formula (32/133/33343), number of papillae and guard chaetae in AIIIO (5 and 3), chaetae on Th. I tergum (5+5) and on subcoxae 1 of legs I-III (3, 4, 4), as well as ms on Th. III tergum. The most notable difference between these species is the presence of sternal parapseudocelli on Abd. II and Abd. IV in S. pseudogeminus sp. nov., whereas true pseudocelli are developed at the same positions in S. geminus. Apart from this, S. pseudogeminus sp. nov. is characterized by shorter unguiculus (unguiculus/unguis ratio is 0.5 in S. pseudogeminus sp. nov. and 0.75 in S. geminus) and longer and stronger AS (AS/unguis ration is 0.7 in S. pseudogeminus sp. nov. and 0.33 in S. geminus). Body white in alcohol. Length of body 0.6-0.66 mm in females, 0.58-0.6 mm in male; holotype: 0.6 mm. Shape of body typical of the genus: subcylindrical without anal spines.