Bagnallella dubia (Deharveng, 1981) Potapov & Deharveng & Janion-Scheepers, 2021

Potapov, Mikhail, Deharveng, Louis & Janion-Scheepers, Charlene, 2021, Taxonomy of the Proisotoma complex. VI. Rediscovery of the genus Bagnallella Salmon, 1951 and epitoky in Bagnallella davidi (Barra, 2001), comb. nov. from South Africa, ZooKeys 1072, pp. 185-204 : 185

Bagnallella dubia (Deharveng, 1981) comb. nov.

Figures 3 , 4

Cryptopygus dubius Deharveng, 1981

Material examined.

New Zealand, South Island, Central Otago, Pisa Range and Old Man's Range , high alpine zone, different sites, 17.02.2014, M. Minor leg.

Diagnosis.

Maxillary palp bifurcate, two prelabral chaetae. Dens with 12-16 anterior chaetae. Mucro bidentate. Anterior side of manubrium with 1+1 chaetae. 33/22235 s and 10/100 ms on body. 2+2 ventral chaetae on Th.III.

Description.

Colour grey. Cuticle, ocelli, outer mouth parts, and antennae as in B. sedecimoculata . PAO as long as 0.8-0.9 Ant. I and as 1.4-1.5 as long as Claw III. Ventral side of head with 4+4 postlabial chaetae. Th.III with 2+2 ventral axial chaetae.

Macrochaetae weakly differentiated, medial ones on Abd.V about as long as 0.4-0.5 of tergal midline. S-chaetae weakly differentiated. S-formula as 43/22235 (s), 10/100 (ms) (Fig. 4 ). S-chaetae on Abd.I-III in mid-tergal position. Tibiotarsi 1-2 with 21 chaetae, Tibiotarsi 3 with few additional chaetae. Tibiotarsal tenent chaetae not developed. Ventral tube with 4+4 laterodistal and usually with five posterior chaetae. Retinaculum with 4+4 teeth and two chaetae. Anterior furcal subcoxae with 13-15 chaetae, posterior ones with 7-9. Anterior side of manubrium with 1+1 distal chaetae. Dens with 12-16 anterior chaetae, posterior side of dens with crenulation and seven chaetae (Fig. 3 ). Mucro bidentate. Ratio of manubrium: dens: mucro = 6.0-6.7: 5.0-6.0: 1. Males present, with two thin spurs on Tibiotarsi I.

Discussion.

This species was named after its dubious position in generic system of Proisotoma / Cryptopygus ( Deharveng 1981). It resembles B. sedecimoculata (see the Discussion below) and apparently belongs to the genus Bagnallella by separation of two last abdominal segments and s-chaetotaxy of Abd.IV and V. Our specimens from New Zealand match the first description.

Distribution.

Bagnallella dubia was described from Marion Island and recorded in Macquarie Island ( Greenslade and Wise 1986) and alpine sites of New Zealand ( Babenko and Minor 2015). The species is possibly widely distributed in cold sites of high altitudes of the Southern Hemisphere. Its occurrence in Australia ( Greenslade 2006) needs to be verified.

Figures

Figures 1 - 4. S-patterns of Abd. IV-VI in the genera Cryptopygus Bagnallella and Scutisotoma (1) B. sedecimoculata (2) and B. dubia (3, 4) 2, 3 furca, anterior view 4 macrochaetae and s and ms-chaetae on body. s = s-chaetae, ms = ms-chaetae.