Paracerura pindorama, Gabriel C. Queiroz & Maria Cleide De Mendonça, 2010

Gabriel C. Queiroz & Maria Cleide De Mendonça, 2010, Two new Isotomidae species (Collembola) from Espírito Santo State, Brazil, Zootaxa 2480, pp. 37-44 : 42-44

Paracerura pindorama sp. nov.

Figs 14–31

Type material. Holotype male. Brazil, Espírito Santo State, Sooretama municipality, Sooretama Biological Reserve (ICMBio). Litter of the Atlantic Rain Forest . About 200 m above the sea level and 40 km from the coast line. Local coordinates: 19°3'8.53"S, 40°8'56.12"W. Type material: 25.iv.2008, Gabriel C. Queiroz coll. Paratypes: 16 (Nº 1958 CM/ MNRJ) on slides, same date as holotype. Deposited at Museu Nacional do Rio de Janeiro, Brasil .

Description. Body length of holotype 1.25 mm. Habitus typical of the genus. Body tegument with fine primary granulation, without craters. Color generally pale with diffuse pigmentation, varying from bluish in the juveniles to yellowish, in adults. Pigments concentrated on posterior ends of terga.

Body chaetotaxy. Abundant, smooth common setae of different sizes, macrochaetae not clearly differentiated ( Fig. 14 ). Head with short setae in interocular area, longer between antennae, lateral and posterior borders ( Fig. 15 ). Axial setae without defined pattern. Sensillar formula per half tergite: 4,4/ 3,3,3,12–14,7; sensilla long and thin (13 µm); on abdominal segment V some sensilla are stouter and with spiral trace ( Fig. 16 ).

Antennae. Slightly shorter than head diagonal, covered by common setae with different sizes. Ratio antennae: head diagonal = 1:1.4. Antennal segment I with about 18 setae, 5 basal microsetae (2 dorsal and 3 ventral), 2–3 ventral sensilla, one longer than others. Antenal segment II with about 54 setae, 4 basal microsetae (one dorsal, 1+1 lateral, one ventral) and one proximal lateral sensillum ( Fig. 17 ). Antennal segment III with about 43 setae, sensory organ formed by 2 broad and rough sensilla partially covered by integumentary fold (in a few specimens sensilla seemed freely inserted in tegument), 2 guard sensilla, one ventrolateral robust microsensillum, one basal microseta ( Fig. 18 ). Antennal segment IV with peg-like subapical organite protect by one curved seta and with about 15 sensilla poorly differentiated from common setae; apical papilla absent ( Fig. 19 ). Ratio of antennal segments I:II:III:IV= 1:1.5:1.6:1.9.

Head. Eyes 8+ 8 in pigmented eye patch. Postantennal organ (17 µ m) elongated and elliptical with chitinous borders and bridges, 3–4 surrounding setae. Mouthparts of chewing type. Labrum with 4 roundish apical folds and ventral ciliation, 4 prelabral setae and 5,5,4 labral setae inserted on papillae. Maxillary capitulum with 3 teeth and 6 subequal lamellae, with marginal ciliations, the longer not surpassing the apical teeth ( Figs. 20 ). Mandible with four apical teeth ( Fig. 21 ). Maxillary outer lobe bifurcated, with 4 sublobal hairs and one basal seta ( Fig. 22 ). Labial palp with 5 papillae, 15 setae (a1, b1–4, d1–4, e1–6) and one lateral process slightly surpassing the E papilla ( Fig. 23 ). Head with 3+3 setae along linea ventralis.

Appendages. Femora I and II with one setae (45 µm), on the inner side, longer than others. Femur III without this seta. Tibiotarsi I, II and III with 21–23, 21–23 and 31–38 setae respectively, tenent hair pointed, distal whorl with 8 setae on tibiotarsi I–III. Unguis very long and thin (85 µm) with one inner, 1+1 lateral and one dorsal tooth; unguiculus (36 µm) long and thin without apical filament ( Fig. 24 ).

Ventral tube with 3–4+3–4 apical, 3+3 anterior and 2+2 posterior setae. Retinaculum with 4+4 teeth, 4–7 setae on corpus ( Fig. 25 ). Anterior part of furcal subcoxa with 17 setae and posterior with 10–12 setae. Anterior part of manubrium with about 15 central proximal, 19+19 distal and 9+9 lateral setae ( Fig. 26 ). Dens crenulated with about 20 dorsal and 125 ventral setae; internal row with 18–24 ciliated spiny setae ( Figs. 27, 28 ). Mucro quadridentated, without seta ( Fig. 29 ). Ratio manubrium:dens:mucro = 8:13:1. Male and female genital openings in figure 30 and 31.

Discussion. Paracerura pindorama sp. nov. shares some similarities with P. virgata Deharveng & Oliveira, 1994 (described from “Amazônia”) as postantennal organ with chitinous borders and bridges, number of ventral tube setae and number of anterior and posterior subcoxae setae. However, the new species can easily be differentiated by the combination of the following characters: diffuse pigmentation varying from yellowish to bluish, dorsal sensillar formula on abdominal segment IV–V, the anterior and posterior dens setae, including one internal row of ciliated spiny setae. The new species is also similar to P. serrana ( Mendonça et al., 2009) by the presence of femoral seta on legs I and II, and spiraled trace on some sensilla of abdominal segment V. However, P. serrana has an internal row of smooth spiny setae on dens, different from the ciliated spiny setae of the new species. This last character, together with the number and distribution of sensillar formula of abdominal segments IV and V, appear to be the most distinguishing characters of P. pindorama sp. nov. among the other species of the genus.

Etymology. Pindorama is a digression of the word pindoretama, from the indigenous brazilian language Tupi, which means “land of the palm trees”. A few indigenous tribes used this word in reference to part of the southeast and northeast of Brazil.

Figures

FIGURES 14 – 16. Paracerura pindorama sp. nov.: 14, dorsal chaetotaxy from th. II to abd. VI; 15, dorsal chaetotaxy of the head and detail of postantennal organ; 16, dorsal sensillar pattern of abdominal segments IV and V (common seta omitted).

FIGURES 17 – 31. Paracerura pindorama sp. nov.: 17, ant. segments I – II, dorsal view; 18, apical portion of left antennal segment III, dorsal view; 19, antennal segment IV, dorsal view; 20, maxilla; 21, mandible; 22, sublobal hairs of maxillary outer lobe; 23, labial palp; 24, femur and tibiotarsus of leg II, lateral view; 25, tenaculum; 26 anterior view of manubrium; 27, posterior view of dens; 28, anterior view of dens, with detail of ciliated spiny setae; 29, mucro; 30, male genital opening and its surrounding setae; 31; female genital opening.