Itanura brasiliensis ( Arlé, 1959 ) Arle, 1959

Queiroz, Gabriel C. & Deharveng, Louis, 2015, New genus, new species and new record of Neanurinae (Collembola, Neanuridae) for the Neotropics, Zootaxa 4020 (1), pp. 134-152 : 142-146

Itanura brasiliensis ( Arlé, 1959) comb. nov.

Figs 17–21 ; Tabs 4 , 5

Neanura brasiliensis Arlé, 1959

Paleonura brasiliensis ( Arlé, 1959) comb. nov. in Cassagnau & Oliveira, 1990

Material examined. Lectotype of Neanura brasiliensis Arlé, 1959 hereby designated. One female (slide 241). Itajubá, MG, Brazil. Leaf litter of Atlantic Forest. 11.x.1957. About 950 m a.s.l. Arlé, R. leg. Deposited at MNRJ. Paralectotypes of Neanura brasiliensis Arlé, 1959 : one female on slide with lectotype; same data as lectotype. Deposited at MNRJ. One male, one female and one juvenile (slide 246). Itajubá, MG, Brazil. Leaf litter of Atlantic Forest. 12.x.1957. About 950m a.s.l. Arlé, R. leg. Deposited at MNHN.

Other material examined. Cassagnau collection: four females on slide 753 (1); two specimens on slide 753 (2); three specimens on slide 753 (3); two females and four juveniles on slide 753 (4); three females and four juveniles on slide 753 (5). Itajubá, MG, Brazil. Leaf litter of Atlantic Forest. 1961. About 950 m a.s.l. Arlé, R. leg. Locality. Itajubá municipality, Minas Gerais State, Brazil. About 950 m a.s.l. Local approximate coordinates: 22°25′33″S, 45°27′10″W. Leaf litter of Atlantic Forest.

Redescription. Length 0.50–1.01mm (n=5). Colour white in ethanol. Eyes 2+2, their diameter twice the length of Ocm socket diameter. Habitus stocky ( Fig. 17 ). Weak cryptopygy. Head and tergite tubercles moderately developed, differentiated in bosses, with tertiary granulation. Dorso-internal area of head and Th I–Abd IV without elementary tubercles. No reticulations. No plurichaetosis. No button-hole structures on tergites.

Dorsal chaetotaxy constituted of ordinary chaetae and S-chaetae. Ordinary chaetae differentiated in dorsal macrochaetae of similar length and morphology, rather small, with serrations covering the apical 1/3 of their length, rounded apically; 1+1 mesochaetae of CL and 3 mesochaetae of (L+So) on head, 3 mesochaetae of L on abd IV and 2 of (DL+L) on Abd V smooth and acuminate; microchaetae, thinner, shorter, bent, acuminate, smooth. S-chaetae thinner, smaller than closest macrochaetae.

Antennae shorter than head, less than two times as long as wide at basis. Ant I with 7 chaetae, Ant II with 11 chaetae. Ant III organ with 5 S-chaetae, guard chaetae Sgd and Sgv slightly longer and slender than S-chaetae of Ant IV. Ant IV organite as a very small rod, almost entirely burried in the integument; apical bulb as a single mass, fused to Ant IV tip. Eight subequal S-chaetae (S1–S8) on Ant IV.

Buccal cone moderately elongated. Maxilla styliform, mandible thin and probably bidentate. Labrum rounded apically ( Fig. 18 ), elongated, labral formula?/?2,4. Labium with 4 basal, 3 distal and 3 lateral chaetae; x-papillae not observed.

Head chaetotaxy as in Table 4 , with 12 chaetal groups: CL, Af, 2 Oc, 2 Di, 2 De, 2 DL, 2 (L+So). Tubercles moderately developed, Af composed of 8–9 elementary tubercles, separated from Oc and CL ( Fig. 19 ). Central area with A, B, D, F, G, Oca, Ocm and Ocp (C, E, H and O absent; A, B and F, G on the border of tubercles, D free). No tubercle Di (Di1 free).

Tergite chaetotaxy illustrated on Fig. 17 . Tubercles moderately developed, most visible laterally from head to Abd VI. No tubercles Di from Th I to Abd IV. Th II–III with 3 chaetae Di. Tubercle De of Th–III with 3 chaetae (De1 and De3 as M, De2 as mi) and 1 S-chaeta. Abd V with tubercles Di adjacent on the axis, separated from De; two chaetae VL(+?L) located ventrally, without tubercle. Tubercle Di of Abd V with Di1 M, Di2 as mi and Di3 absent. Abd VI bilobed. S-chaetotaxic formula: 2+ms, 2/11111.

Tita without chaeta M and with B4–B5 not longer than other long chaetae ( Fig. 20 ). Claw untoothed, not striated in its basal part, and devoid of secondary granulation.

Ventral chaetotaxy of Abd I–VI as in Fig. 21 . Furcal rest with 3 chaetae, apparently devoid of mi. Postcephalic chaetotaxy summarized in Table 5 .

Material examined. Two females (#2147 CM/ MNRJ), 15.vii.2011, Queiroz G.C. leg. Deposited at MNRJ in Brazil and MNHN in Paris, France. Locality. Parque Nacional do Itatiaia (ICMBio), Itatiaia municipality, Rio de Janeiro State, Brazil. 2300–2500 m a.s.l. Local coordinates: 22º22'59"S, 44º40'1"W. Leaf litter and soil of "campos de altitude".

Remarks. Labium with 2 x-papillae visible ( Fig. 24 ). Head with Af composed of 7–8 tubercles separated from Oc and CL. Leg chaetotaxy of legs I–III as follows: Scx2– 0, 2, 2; Cx– 3, 8, 8; Tr– 6, 6?, 6?; Fe– 12?, 11, 10?; Tita– 18, 18, 17. Furcal rest with 3 chaetae, devoid of mi; Ve chaetae, on ventral anal valves, 11–12 ( Fig. 26 ). For other differences see Table 6 .

Figures

FIGURE 17. Dorsal chaetotaxy of Itanura brasiliensis (Arlé, 1959) comb. nov. from Itajubá, MG, type locality. Scale bar: 80 µm.

FIGURES 18 – 21. Itanura brasiliensis (Arlé, 1959) comb. nov. from Itajubá, MG, type locality. 18. Apical part of labrum; 19. Detail of Oc and Af tubercles; 20. Tita II; 21. VT and half body ventral chaetotaxy of Abd II – VI. Scale bars: 20 µm (Figs 18 – 20); 40 µm (Fig. 21).

FIGURE 23 – 27. Itanura brasiliensis comb. nov. from Itatiaia, RJ. 23. Dorsal chaetotaxy of Ant III – IV; 24. Labium; 25. Tita I; 26. Ventral chaetotaxy of Abd I – VI; 27. Female genital plate. Scale bars: 20 µm (Figs 23 – 25, 27); 40 µm (Fig. 26).

Tables

TABLE 4. Dorsal Cephalic chaetotaxy of Itanura brasiliensis (Arlé, 1959) comb. nov. from Itajubá-MG, type locality.

Group of chaetae	Tubercle	Number of chaetae	Type of chaetae	Chaetae
CL	+	2+2	M me	F G
Af	+ –	2+2 1+1	M mi	A, B D
Oc	+	3	mi M M	Oca Ocm Ocp
Di	–	1	M	Di1
De	+ –	1 2	M mi	De1 Di2, De2
DL	+ – –	2 1 1	M me mi	DL1, DL5 DL4 DL2
L+So	+ –	3 1 3	M me me	L1, L4, So1 L2, So3, So4, So6

TABLE 5. Postcephalic chaetotaxy of Itanura brasiliensis (Arlé, 1959) comb. nov. from Itajubá-MG, type locality.

Di	De	DL L	Scx2	Cx	Tr	Fe	Tita
Th I 1	2	1 –	?	?	?	?	18
Th II 3	3+S	3+S+ms 3	?	?	?	?	18
Th III 3	3+S	3+S 3	?	?	?	?	17
continued.