Deuteraphorura dashtenazensis Arbea, Yahyapour & Shayanmehr, 2020

Yahyapour, Eliye, Shayanmehr, Masoumeh, Vafaei-Shoushtari, Reza & Arbea, Javier I., 2020, A review of the Iranian species of the family Onychiuridae (Collembola Poduromorpha), with description of five new species from Hyrcanian Forests in Iran, Zootaxa 4861 (1), pp. 1-22 : 7-9

Deuteraphorura dashtenazensis Arbea, Yahyapour & Shayanmehr sp. nov.

Figs 13–21 , Table 2 .

Type locality. Iran, Mazandaran Province, Sari county, Dashte Naz forest , 11 m a.s.l. (36º71ʹ10ʺ N, 53º09ʹ11ʺ E) .

Type material. Holotype male, Mazandaran Province, Sari county, Dashte Naz forest , soil and leaf litter, 29 April 2016, leg. Eliye Yahyapour. Paratypes: All specimens from the same locality as holotype, 1 male, 8 females and 1 juvenile . Holotype and 4 females paratypes deposited in MNCN, 5 paratypes (1 male and 4 females) in SANRU .

Etymology. The species was named after the type locality, Dashte Naz forest.

Description. Color in alcohol, white. Holotype (male) length 1.4 mm, paratypes: male length 1.5 mm; females length 1.5–1.9 mm. Shape of body typical for the genus: cylindrical without anal spines ( Figs 13 and 14 ). Granulation more or less uniform, distinct.

Antennae slightly shorter than head (ratio 0.9). Antennal base well marked. Ant. I–III with 8, 13–15, 19 chaetae, respectively. AIIIO with 5 guard chaetae, 5 papillae, 2 smooth sensory rods, 2 curved and ribbed sensory clubs, ventro-lateral ms present ( Fig. 17 ). Ant. IV with subapical organite, and latero-external ms, ca. 0.20× length from the base; with some blunt macrochaetae and about 20 thin mesochaetae like sensilla, not well distinguishable from ordinary chaetae ( Fig. 17 ).

PAO with 13–15 compound vesicles disposed in two parallel rows ( Fig. 18 ). Labral formula of chaetae: 4/542 ( Fig. 19 ). Maxillary outer lobe with simple palp, basal chaeta and with 2 sublobal hairs. Submentum with 4+4 chaetae, basolateral field (mentum) with 5 chaetae. Labial palp of AB type, with six proximal chaetae.

Pseudocellar formula dorsally: 33/133/33353; ventrally: 12/000/1221. Pso arranged as in Figs 13–16 . Subcoxae 1 of I–III legs with 2, 2, 2 pso. Psx and psp not seen.

Distribution of dorsal chaetae as in Figs 13–14 , well differentiated into macro-, meso- and microchaetae; asymmetries are common. Sensory chaetae not especially distinct. Head with chaeta d0. Th. I with 8+8 chaetae. Th. II and III with lateral ms. Chaeta p0 present on Abd. IV and VI.

Ventral chaetotaxy as in Figs 15 and 16 . Th. I–III sternites without chaetae. VT with 4+4 chaetae, and without chaetae at base. Furcal area with 2+2 microchaetae in one row, three manubrial rows: ma-row with 2+2 chaetae– – lateral ones displaced on the level of dental microchaetae, mm-row with 2+2, mp-row with 2+2(3) chaetae– –external ones as macrochaetae. In adult males MVO present as 4+4 thick modified chaetae on Abd. III located closely together in elliptical integumentary pocket ( Fig. 21 ). In subadult males chaetae in MVO modified in lesser extent ( Fig. 16 ). Anal valves with numerous acuminate chaetae: each lateral valve with a0, 2a1; unpaired anal valve with chaetae a0, 2b1, 2b2, c0, 2c1, 2c2 ( Figs 15 and 16 ).

Legs: Subcoxae 1 of I–III legs with 4–5, 5, 5 chaetae, subcoxae 2 with 0, 4, 4, coxae with 4, 6–10, 10, trochanters with 9, 9, 9, femora with 15, 15–17, 15, tibiotarsi of legs I–III with 19(9+8+2), 19(9+8+2), 18(9+7+2) chaetae, respectively. Claw without denticle. Empodial appendage with narrow basal lamella, distinctly shorter than claw ( Fig. 20 ).

Discussion. According to Jordana et al. (2012) the new species belonging to the Deuteraphorura group of species with 1+1 pso on Th. I tergite, is morphologically the most similar to three european cave species with 3+3 pso on the posterior part of head and 3+3 pso on Th. II–Abd. III. Main differences between D. dashtenazensis sp. nov. and these species are summarized in Table 2 . The new species differs from other ones by different formula of dorsal and ventral pso. The new species has the same formula of dorsal pso (33/133/33353) as D. closanica ( Gruia, 1965) , but they differ by numerous characters (see Table 2 ).

Figures

FIGURES 13–16. Deuteraphorura dashtenazensis sp. nov.: 13, head and Th. dorsal chaetotaxy; 14, Abd. dorsal chaetotaxy; 15, Abd. ventral chaetotaxy of a female; 16, Abd. ventral chaetotaxy of an unreproductive male. Scales: 0.2 mm.

FIGURES 17–21. Deuteraphorura dashtenazensis sp. nov.: 17,Ant. III and IV dorsal; 18, PAO; 19, labrum; 20, tibiotarsus and claw III; 21, MVO of a reproductive male. Scales: 0.05 mm.