Paracerura airesi, Mendonça, Maria Cleide De, Abrantes, Eduardo Assis & Fernandes, Liliane Henriques, 2009

Mendonça, Maria Cleide De, Abrantes, Eduardo Assis & Fernandes, Liliane Henriques, 2009, Two new Brazilian species of Paracerura Deharveng & Oliveira (Collembola: Isotomidae), Zootaxa 2310, pp. 24-34 : 26-27

publication ID	https://doi.org/ 10.5281/zenodo.191855
DOI	https://doi.org/10.5281/zenodo.5694398
persistent identifier	https://treatment.plazi.org/id/03DB87D2-8823-FF82-D6B0-A3BEFCB136C7
treatment provided by	Plazi
scientific name	Paracerura airesi
status	sp. nov.

Treatment

Paracerura airesi sp. nov.

Figs 1 View FIGURES 1 – 2 , 3–20 View FIGURES 3 – 5 View FIGURES 6 – 13 View FIGURES 14 – 21 , Tab. 1 View TABLE 1

Type material. Hotype female: Brazil, State of Tocantins, São Salvador, Vila do Espírito Santo, in the marginal vegetation of Paranã river, 07.iv.2005, collection number CM/ MNRJ 1559, Silva, J. dos S. coll. Paratypes: 4 females, 5 males and 2 juveniles on slides, 6 in ethanol, the same data as holotype.

Description. Body length of holotype: 1.43 mm. Body tegument with fine primary granulation, without craters. Color generally bluish, including head. Posterior border of tergites darker. Antennae with diffuse pigmentation, slightly more intense in the antennal segment I. Head bluish, more intense in a quadrilateral patch in the interocular area. Legs with slight pigmentation. Furca pale, with slightly bluish pigmentation on proximal lateral region of the manubrium ( Fig. 1 View FIGURES 1 – 2 ).

Body chaetotaxy. Abundant smooth common setae with different sizes, some of them a little longer on the abdominal segments V and VI borders, macrochaetotaxy not clearly differentiated ( Fig. 3 View FIGURES 3 – 5 ). Head chaetotaxy with short setae along the interocular area and longer between the antennae and along lateral and posterior borders ( Fig. 4 View FIGURES 3 – 5 ). Axial setae without defined pattern. Macrosensillary and microsensillary set by half tergite respectively with 3,3/2,2,2,8,5 and 1,1/1,1,1,0,0. Macrosensilla long and thin, except 2+2 robust with rough texture in the abdominal segment V ( Fig. 5 View FIGURES 3 – 5 ).

Head. Eyes 8+ 8 in pigmented, elongated patch. Postantennal organ (26 µm) elliptical with chitinous borders, 3-4 surrounding setae ( Fig. 6 View FIGURES 6 – 13 ). Antennae slightly shorter than the head diagonal, covered by common and acuminated setae with different sizes. Ratio antennae: head diagonal = 0,9: 1,0. Antennal segment IV plurichaetotic, with tubuliform subapical organite, one dorsolateral microsensillum, protected by one curved seta and some sensilla poorly differentiated to the common setae. Apical vesicle absent. Antennal segment III with about 45 setae, sensory organ composed by 2 broad sensilla partially hidden by an integumentary fold, 2 guard sensilla, one lateral microsensillum and one dorsolateral microseta ( Figs 7–8 View FIGURES 6 – 13 ). Antennal segment II with about 50 setae, one lateral proximal sensillum, 5 basal microsetae (one dorsolateral, one lateral external, 2 inner lateral and one ventral). Antennal segment I with 22 setae, 5 basal microsetae (3 dorsal and 2 ventral); ventral face with 2 subequal sensilla and 4 small granules disposed in circle ( Figs 9–10 View FIGURES 6 – 13 ). Ratio of the antennal segments I: II: III: IV = 1: 1,5: 1,7: 2,1. Labrum with 4 sharp apical folds and ventral ciliation, 4 prelabral setae and 5,5,4 labral setae, inserted on papillae ( Fig. 11 View FIGURES 6 – 13 ). Mandible with well developed molar plate. Maxillary capitulum with 3 teeth and 6 ciliated and subequal lamellae, with marginal ciliations. Maxillary outer lobe with bifurcated palp, 4 strong sublobal hairs and one basal seta ( Fig. 12 View FIGURES 6 – 13 ). Labial palp with 5 papillae and one lateral process surpassing the E papilla ( Fig. 13 View FIGURES 6 – 13 ). Head with 3+3 setae along linea ventralis.

Appendages. Tibiotarsi I and II with 26 setae each; tibiotarsus III with 37–40 setae and distal whorl with 9 setae; tenent hair pointed. Unguis long and thin, with one inner, 1+1 lateral and one dorsal tooth (56µm). Unguiculus long and thin (22 µm), without apical filament ( Figs 14–15 View FIGURES 14 – 21 ). Ventral tube with 4+4 distal, 3+3 anterior and 2+2 posterior setae. Retinaculum (50 µm) with 4+4 teeth and 4–6 setae on corpus ( Fig. 16 View FIGURES 14 – 21 ). Furcal subcoxa anterior with 9–17 setae ( Fig. 17 View FIGURES 14 – 21 ), posterior with 12–13 setae ( Fig. 18 View FIGURES 14 – 21 ). Manubrium with 5– 6+5–6 basal, none medial, 10–16 central proximal on anterior face and 5–6+5–6 lateral setae. Dens crenulated, with 10–13 dorsal, 75–80 ventral and about 14 common setae in the inner row. Mucro quadridentate (one internal, 2 robust medial and one reduced apical), without seta ( Fig.19 View FIGURES 14 – 21 ). Ratio manubrium: dens: mucro = 7: 10.8: 1. Male and female genital plates as in Figs 20 and 21 View FIGURES 14 – 21 respectively.

Derivatio nominis. This species is cordially dedicated to the Petrobrás geologist, Dr. José Ribeiro Aires, informally knew as Dr. Aires, for his admiration and respect for the natural envirornment and commitment to its conservation.

Discussion. Paracerura airesi sp. nov. resembles P. virgata mainly in the sensillary set from the thoracic segment II to the abdominal segment III, habitus, body chaetotaxy, and number of setae along linea ventralis. However, the new species differs essentially from P. v i rg a t a, P. itatiaiensis and P. serrana sp. nov. by 3+3 as and 5+5 accp sensilla in the abdominal segment IV and 3+3 as and 2+2 accp in the abdominal segment V ( Table 1 View TABLE 1 ).

Two of the as sensilla in abdominal segment V in P. a i re s i sp. nov. are robust with rough texture, different from the sensillary pattern of the same segments described in P. virgata . The unguis internal teeth, cited by the authors of P. virgata as present or absent, are always present in P. a i re s i sp. nov. The new species also has a bigger body size and consequently a notably higher number of setae in the tibiotarsi and in the ventral face of manubrium and dens. It was observed the presence of one organite composed by 4 granules in the ventral face of the antennal segment I of the new species, similar to the one described by Deharveng (1978) in the antennal segment II of Pseudisotoma microchaeta Cassagnau, 1959 .