New oversize troglobitic species of Campodeidae in Japan (Diplura)

Abstract

Two new oversize troglobitic species of diplurans campodeids, Pacificampadaidarabotchi Sendra, sp. n. and Pacificampanipponica Sendra, sp. n., found in three caves in two southern Japanese islands are described. It is the first record of cave-dwelling Diplurans from Japan and more specifically these are two Campodeinae of Pacificampa Chevrizov, 1978 formally known in continental Asia with three cave-dwelling species described in Russia and China near the north of the Korean peninsula. In P.daidarabotchisp. n., in addition to its oversized body, the longest ever known in campodeids family, it shows as its main differential taxonomical feature the absence of lp metanotal macrosetae. P.nipponicasp. n. is much closer to continental Pacificampa species but it shows differences in the urotergal macrosetae formula. Both Japanese species have clear troglomorphic features related with their elongated body and appendages and an increase in number and complexity of the sensorial antennal equipment with unique olfactory chemoreceptors. Two biogeographical remarks are inferred: P.nipponicasp. n., has been found in two islands that were connected during the glacial age and P.daidarabotchisp. n. lives in a single cave near another where P.nipponicasp. n. dwells which allowing to suggest a sympatric distribution; Pacificampa seems to be related with Eumesocampa, a genus from North-America, as a consequence of the Holarctic connection between Asia and America. The interests of P.daidarabotchisp. n. and P.nipponicasp. n. as endemic species in addition to their biogeographical importance should be taken into consideration to ensure better management of the three touristic caves where they dwell and especially the protection of Mejido-do cave, the only location of the large P.daidarabotchisp. n. near to an active quarry.