Odontella septemlobata, (Salmon, 1954)

Arbea, Javier I. & Palacios-Vargas, José G., 2020, A new species of Odontella from Tierra del Fuego and notes on Afrodontella Deharveng, 1981 (Collembola: Odontellidae), Zootaxa 4808 (3), pp. 526-538 : 532-537

Afrodontella septemlobata ( Salmon, 1954)

Figs 20–25 , Tables 3−4

Material examined: Kenya, near Massai Mara National Reserve , savanna, fissure in granite rock with moss and liverworts, 25−VIII−1996, leg. B. & K. Kowalski, one female, AFR−96−3 slide in coll. Institute of Systematics and Evolution of Animals, Polish Academy of Sciences, Kraków ( Weiner & Najt 1998) .

Description of specimens from Kenya. Female length 0.54 mm. Body integument strongly granulated.

Antennae 0.9× head length. Ant. I, II and III with 5, 9−10 and 15 ordinary chaetae, respectively. AIIIO consist- ing of two small rounded internal sensory rods and two short guard sensilla, the external sensillum backward displaced; with ventral microsensillum present ( Fig. 23 ). Ant. IV dorso-distally with small ovoid organite and a short ms; six subcylindrical, bent, subequal sensilla (S2, S3, S4, S6, S7 and S8) and thinner S9 sensillum. Ant. IV apex with a domed swelling of integument. Apical exertile vesicle absent ( Fig. 25 ). With eversible sac between Ant. III and IV.

Ocelli 5+5. PAO 1.8−1.9 longer than ocellus B, with 5−6 vesicles ( Fig. 23 ). Buccal cone rather short, with 2+2 postlabial subequal chaetae (m1 absent).

Dorsal chaetotaxy as in Fig. 20 . Ordinary chaetae subequal, short, smooth and pointed. Formula of s-chaetae per half tergum: 0,2,2/1,1,1,1,1; position from Th. II to Abd. V: m6+p4,m6+p4/p5,p5,p5,p5,p3). Ms present on Th. II and III. Head without chaeta a0 and with chaetae sd2 and c3. Th. I with 4+4 chaetae; Th. II and III with 10+10 chaetae (m4 and m6(s) present). Abd. I–III with 9+9 chaetae (p4 absent); Abd. IV with 12+12 chaetae (m3 and m5 chaetae present, m1 absent); Abd. V with 3+3 chaetae between s-chaetae (a1, p1−2). Anal spines absent.

Ventral chaetotaxy. Th. I−III without chaetae. Ventral tube with 3+3 apical chaetae, without lateral chaetae. Abd. II with 4+4 chaetae; Abd. III with 5+5 chaetae. Furcula well developed with 6 chaetae on each dens; mucro reduced, unilobed, three times shorter than dens ( Fig. 24 ). Retinaculum with 3+3 teeth. Each anal valve with three hr-chaetae.

Tibiotarsi I, II and III with 17, 17 and 16 chaetae (9+8, 9+8 and 9+7), two of which are blunt or slightly clavate tenent hairs; with chaetae M on all legs; tibiotarsus III lacking chaeta B6 ( Figs. 21, 22 ). Subcoxa 1, subcoxa 2, coxa, trochanter and femur with 1/2/2; 0/2/2; 2/4/5; 5/5/5; 10/10/10 chaetae on leg I, II and III, respectively. Teeth not seen on the claws. Empodial appendage reduced.

Taxonomic note. Afrodontella differs from all known species of the Odontella lobata group by the structure of the PAO with separate vesicles and by the reduced chaetotaxy (see Table 3).

Figures

FIGURES 20–25. Afrodontella septemlobata: 20, dorsal chaetotaxy; 21, tibiotarsus and claw III; 22, tibiotarsus and claw II; 23, PAO and ocelli; 24, dens and mucro; 25, antennal chaetotaxy. Scales: 0.1 mm (20), 0.02 mm (21–25).