Taxonomy of the Cryptopygus complex. I. Pauropygus - a new worldwide littoral genus (Collembola, Isotomidae)

Abstract

In this paper, we describe the new genus Pauropygus gen. n. which includes three minute species, blind and unpigmented, living in interstitial littoral habitats in tropical or subtropical countries. Two of these species are new to science (type species Pauropygus projectus sp. n. from New Caledonia and Pauropygus pacificus sp. n. from China); the third one, originally described in the genus Cryptopygus (Cryptopygus caussaneli Thibaud, 1996), has a larger pantropical distribution. We synonymize here Cryptopygus riebi Barra, 1997 from South Africa with Pauropygus caussaneli. Two paratypes of the Mexican species Cryptopygus axayacatl Palacios & Thibaud, 2001 turned also to be Pauropygus caussaneli, while the holotype and remaining paratypes of this species support its placement in Proisotomodes. Among the Cryptopygus complex, Pauropygus gen. n. is easily recognized by characters of mouthparts (presence of two large projections on pleural fold, basolateral field with 6 chaetae, modified mouthparts) and reduced sensillar chaetotaxy (tergal sensilla 2-3,0-1/0-1,0-1,1-2,1-2,1-3, microsensilla reduced in number: 00/0-100, with sensilla situated in p-row on the abdomen). Small size, absence of eyes and pigment are also shared by all its species. The three species belonging to the genus differ by sensillar chaetotaxy.

Wnt6 is required for maxillary palp formation in Drosophila

“…Hexapods include ectognaths (exposed jaws; Insecta sensu stricto) and entognaths (enclosed jaws). The minute, wingless entognaths have three orders, Protura, Diplura and Collembola, and represent the sister group to insects [ 20 , 21 ]. Maxillary palps are present in most insects and also in entognaths, indicating that the structure was present in their last common ancestor.…”

Taxonomy of the Cryptopygus complex. III. The revision of South African species of Cryptopygus and Isotominella (Collembola, Isotomidae)

“…Pleural fold on mouth cone with two finger-like processes (fig. 20 in Potapov et al 2013) Discussion. Here we follow our simplified characterisation of the genus proposed formerly (Potapov et al 2017) that is an expanded version of diagnosis of Rusek (2002).…”

“…This remarkable feature is less pronounced in I. geophila in which this number is variable (five or six). Six basolateral chaetae on the labium were found in the genus Pauropygus (Potapov et al 2013) in P. projectus Potapov et al, 2013, P. caussaneli, P. pacificus Potapov et al, 2013, which also shows the posterior position of the s-chaetae on tergites. The two genera share other important characters and are probably closely related (Potapov et al 2013).…”

“…To summarize our data, we provide a key to all species of the Cryptopygus complex for South Africa. This is our second contribution to the taxonomy of the family Isotomidae of the country (Potapov et al 2011) and the third piece of work on the Cryptopygus complex (Potapov et al 2013;Potapov et al 2017).…”

A new species and new records of Pachytullbergiidae and Tullbergiidae (Collembola: Onychiuroidea) from littoral of China, with notes on the variations of postantennal organ

“…This work is our fifth contribution pertaining to Collembola of sandy beaches of China (Potapov et al 2011;Bu et al 2012;Potapov et al 2013;Sun et al, 2012 submitted).…”