Seira diamantinae, Godeiro, Nerivânia N. & Bellini, Bruno C., 2015

Godeiro, Nerivânia N. & Bellini, Bruno C., 2015, Two new species and two detailed chaetotaxy descriptions of Seira (Collembola: Entomobryidae) from Brazil, Zootaxa 3972 (2), pp. 208-230 : 215-221

Seira diamantinae sp. nov.

Figs 6–10

Type Material. Holotype female, Brazil, Bahia, Abaíra, Chapada Diamantina, 1–6.xi.2013. Bellini, B.C. and Ferreira, A.S. col. Paratypes 5 males and 4 females, same data as Holotype. Type material deposited at Collembola Collection of DBEZ / UFRN.

Description. Total body length of Holotype 2,32 mm. Habitus entomobryid ( Figs 6 , 7 A). Color of fixed specimens (in ethanol 100%) pale yellow with dark pigment covering proximal regions of Ant. I–IV, eye patches and lateral borders of head, trochanters, proximal and distal regions of femora I–III, lateral borders of Th. II–III, and terminal Abd. IV–V ( Fig. 6 ). Colour of mounted specimens pale yellow. Brownish rounded scales covering body and head, legs, Ant. I–III, manubrium and dentes (ventrally). Ventral tube with scales. Ant. IV weakly annulated, with single apical bulb and bearing at least four types of setae: large smooth, small smooth, feathered and small blunt setae ( Fig. 7 B). Ant. III sense organ as in Fig. 7 C, with two rods and three guard sensillae. Eye patches oval with 8+8 lenses: ‘A’ lense largest and ‘G’ smallest ( Fig. 8 ).

Five interocular feathered mesosetae (p, q, r, s, t) ( Fig. 8 ). Pre–labral setae multiciliated; labral setae smooth. Maxillary palp with apical and basal setae smooth, subequal in size; sublobal plate with 2 smooth appendages ( Fig. 7 E). Labial papilla as in figure 7E; lateral appendage acuminate; seta-like; and four smooth setae ( Fig. 7 F). Five smooth proximal setae of labial palp; labial triangle formula: M1M2rEL1L2/A1-5; r smooth and reduced ( Fig. 7 D). Mesothoracic hood well developed ( Fig. 7 A). Metatrochanteral organ with approximately 37 short spines ( Fig. 7 G). All ungues with four teeth, two subequal basal paired teeth and two apical unpaired ( Fig. 7 H). Unguiculi lanceolate with smooth margins ( Fig. 7 H). Tenent hair capitate with weakly serrated edges. Ventral manubrium with 13+13 subapical setae, spines typically absent in furcula. Approximately 13+13 finger-like blunt multicilated setae present on distal manubrium and proximal dentes ( Fig. 7 I). Mucro typically falcate ( Fig. 7 J).

Dorsal head chaetotaxy. Antennal series (An) with 9+9 macrosetae; three super-numerary microseta between An3a and An3 (atypical); anterior series (A) with A4 present; A0, A2 and A4 as macrosetae; A1, A1p (atypical) and A3 as microsetae; medio-ocellar series (M) with 5+5 setae; M1, M2 and M4 as macrosetae; M3 and M 4i as microsetae; sutural series (S) series with 6+6 macrosetae (S1, S2, S3, S4, S5, S6) plus unpaired S0; Interocular series with 5+5 mesosetae (p, q, r, s and t); post-sutural (Ps) series with 3+3 setae; Ps2 and Ps3 as microsetae, Ps5 as macroseta; Ps4 absent (typical of Seira , see Soto-Adames 2008); postoccipital anterior (Pa) series with 6+6 setae; Pa1, Pa2, Pa3 and Pa4 as microsetae, Pa5 as macroseta, Pa6 as post ocular trichobothrium; postoccipital medium (Pm) series with 2+2 microseta (Pm1 and Pm3), Pm2 absent (typical of Seira , see Soto-Adames 2008); ‘Pp’ series with 5+5 setae; Pp1, Pp2, Pp3 and Pp4 as microseta; Pp5 as macroseta ( Fig. 8 ).

Dorsal Th. II chaetotaxy. Anterior (a) series (without anterior setal collar) with 13+13 setae; a2p as microseta; a4e, a4, a 4i, a 4i 2, a 4i 3, a 4i 4, a 5i 2, a 5i 2p, a5ip, a 5i, a5, a5p as macrosetae; medial (m) series with 13+13 setae; m 1i 3, m4ip, m5 and m5p as microsetae; m 1i 2, m 1i, m 2i, m 2i 2, m1, m2, m4p, m 4i and m4 as macrosetae; m5a absent; one super-numerary macroseta next to m5p; posterior (p) series with 18+18 setae; p 1i 2p, p 1i 2, p1, p1ip, p 1i, p1p, p2a, p2, p2p, p2ep, p3p and p3 as macrosetae; p2ea, p4, p5, p6 and p6e as microsetae; p2e absent; three external macrosetae near p6 (see Soto-Adames 2008) ( Fig. 9 A).

Dorsal Th. III chaetotaxy. ‘a’ series with 8+8 setae; a1a, a1, a3, a4, a5 and a7 as microsetae; a2 and a6 as macrosetae; ‘m’ series with 5+5 setae; m6 as macroseta; m1, m5, m7 and m6p as microsetae; m 1i and m4 absent; ‘p’ series with 9+9 setae; p3, p4, p5 and p6 as microsetae; p 1i, p1, p2, p2a and p2e as macrosetae; p2ea absent; setula present near m7 ( Fig. 9 B).

Dorsal Abd. I chaetotaxy. ‘a’ series with 5+5 microsetae (a1, a2, a3, a5 and a6); a1a, a1e and a4 absent; setula present near a6; ‘m’ series with 6+6 setae; m5 and m6 as microsetae; m2, m3, m4 and m 4i as macrosetae; ‘p’ series with 2+2 microsetae (p5 and p6) ( Fig. 9 C).

Dorsal Abd. II chaetotaxy. ‘a’ series with 7+7 setae; a2p, a3, as, a6 and a7 as microsetae; a2 as macrosetae; a5 as trichobothrium with 5 surrounding fan shaped scales; ‘m’ series with 9+9 setae; m 3ei, m3ea, m6 and m7 as microsetae; m3, m3ep, m3e and m5 as macrosetae; m2 as trichobothrium with 4 surrounding fan shaped scales; ‘p’ series with 3+3 setae; p5 and p7 as microsetae; p6 as macroseta; el and se present as setulae ( Fig. 9 D).

Dorsal Abd. III chaetotaxy. ‘a’ series with 8+8 setae; as, a3 and a7 as microsetae; am6 as macroseta; a1, a2 and a6 as fan shaped scales; a5 as trichobothrium with 5 surrounding fan shaped scales; ‘m’ series with 6+6 setae; m2 as trichobothrium with 5 surrounding fan shaped scales; m5 as trichobothrium with 7 surrounding fan shaped; m4 and m3ea as fan shaped scales; m7 as mesoseta; m3 as macroseta; ‘p’ series with 6+6 setae; p3, p5 and p7 as microsetae; p 7i as mesoseta; pm6 and p6 as macrosetae; em and emp as fan shaped scales; c3 as fan shaped scale; el as mesoseta; se as setula; d2 setula present, near p5 ( Fig. 10 A).

Dorsal Abd. IV chaetotaxy. ‘A’ series with 9+9 setae; A1 and A5 as microsetae; A2a, A2, A3a, A3, A4, A6 and Ae7 as macrosetae; two super-numerary microsetae above and below Ae7. ‘B’ series with 6+6 macrosetae (B1, B2, B3, B4, B5 and B6); one super-numerary microseta below B6; Be2 and Be3 absent; ‘C’ series with 3+3 or 4+4 setae; C1p and C4a absent; C4 as macrosetae; C1, C2 and C3 as microsetae; C 1 may be absent in some specimens; ‘T’ series with 6+6 setae; T1 absent; T3, T5, T6 and T7 as microsetae; T2 and T4 as trichobothria with 6 and 3 (respectively) fan shaped scales above each of them; ps absent; ‘D’ series with 5+5 setae; D1 as fan shaped scale; D2a and D3p as microsetae; D2 as macroseta; D3 as trichobothria without fan shaped scales associated; ‘E’ series with 5+5 setae; E2a, E3 and E4p absent; E2, E4 and E4p2 as macrosetae; E1 and E2p as microsetae; Ee7 and Ee10 also absent; ‘F’ series with 6+6 macrosetae (F1, F1p, F2, F2p, F3, F3p); ‘Fe’ series with 4+4 setae; Fe2 and Fe2p absent; Fe3 and Fe4 as macrosetae; Fe5 and Fe6 as microsetae; four external microsetae after ‘Fe’ series; Abd. IV with 4+4 posterior setae ( Fig. 10 B).

Distribution of dorsal macrosetae of whole body as in Figure 10 C.

Etymology. The species was named after “Chapada Diamantina National Park”, where the type species was collected; diamantinae also refers to “made of diamonds” in Latin.

Remarks. Seira diamantinae sp. nov. belongs to a very distinct group of Seira species with larger individuals bearing modified blunt macrosetae on distal manubrium and proximal dens. This particular group was described by Arlé (1959) as the genus Ctenocyrtinus, but it was synonymized as Seira by Christiansen & Bellinger (2000). This same group was simultaneously described as the subgenus Lepidocyrtinus Börner by Yosii (1959), but at the present time the use of Seira subgenera has been left out of descriptions (see more in Bellini & Zeppelini 2011b). In either case, a phylogenetic approach to this group among the Seirini is urgent since it would shed light to the true position of these species inside the tribe.

The neotropical species which present the blunt modified setae on furca are: S. prodiga ( Arlé, 1959) , S. xinguensis ( Arlé, 1959) , S. nigrans ( Arlé, 1959) , S. harena Godeiro & Bellini, 2014 and S. diamantinae sp. nov. The last species can be readily distinguished from the others by the combination of the following characters: presence of six macrosetae in Jacquemart’s region 1A of Th. II (a4e, a4, a 4i, a 4i 1, a 4i 2, a 4i 3 and a 4i 4); presence of four macrosetae in Abd. I (m2, m3, m 4i and m4); and presence of two macrosetae in Jacquemart’s region B of Abd II (m5 and p6). From all described species, S. harena resembles most S. diamantinae sp. nov. specially in: the arrangement and quantity of macrosetae in the Jacquemart’s cephalic region 2 (A0, A2 and A4); absence of macrosetae in Jacquemart’s cephalic region 6; and in macrosetae in Abd. III (m3, am6, pm6 and p6).

S. diamantinae sp. nov. was collected in Caatinga biome, in Chapada Diamantina National Park. The region represents a high-altitude wetland ingrown in the middle of the semi-arid landscape; Good’s biogeographic zone 27 ( Good 1974). The specimens were collected during the rainy season. The climate of the area is “ As ” following Koeppen’s system, with a dry summer ( Kottek et al. 2006).

Figures

FIGURE 6. Seira diamantinae sp. nov.: habitus of a fixed specimen.

FIGURE 7. Seira diamantinae sp. nov.: A, habitus; B, apical region of Ant. IV; C, apical region of Ant. III; D, labial triangle setae (right side); E, right maxillary palp and sublobal plate; F, left labial palp and papillae; G, trochanteral organ; H, first empodial complex; I, blunt macrosetae on proximal dens; J, distal dens and mucro.

FIGURE 8. Detailed dorsal head chaetotaxy of Seira diamantinae sp. nov.

FIGURE 9. Detailed dorsal chaetotaxy of Seira diamantinae s sp. nov. (left side): A, Th. II; B, Th. III; C, Abd. I; D, Abd. II.

FIGURE 10. Detailed dorsal chaetotaxy of Seira diamantinae sp. nov.: A, Abd. III (left side); B, Abd. IV (left side); C, Distribution of dorsal macrosetae (right side).