Folsomides cariocus Mendonça & Neves 2020, sp. nov.
Creators: name: Mendonça, Maria Cleide De
name: Neves, Ana Carolina Da Rocha
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Entognatha
Collembola
Isotomidae
Folsomides
Folsomides cariocus

description: Folsomides cariocus sp. nov.
Figs 2 ̅13
Type material. Holotype: Female: mounted on slide Nº 334 CM / MNRJ, Southeast Brazil, City of Rio de Janeiro, 30.V.2019, M.C. de Mendonça, G. Queiroz, T. Silveira, and A.C. Neves coll. Paratypes 1 specimen on slides Nº 225 CM / MNRJ, 18.II.2019; 1 specimen on slide Nº 228a CM / MNRJ, 18.II.2019; 5 specimens on slide Nº 228b
CM / MNRJ, 18. II.2019, M.C. de Mendonça, G. Queiroz, T. Silveira, and A.C. Neves coll., at the same locality. All specimens were deposited in the Museu Nacional / Universidade Federal do Rio de Janeiro, Brazil.
Type locality: Bed with compacted clay soil covered by undergrowth and no litter, where bee Epicharis analis Lepeletier, 1841 (Apidae) make roles for reproduction at Botanical Garden, State of Rio de Janeiro, Brazil (Fig. 1). Coordinates: 21°42’37.20’’S; 43°53’46.36’’O.
Description. Total holotype body length: 0,84 mm. Paratypes body length: 0,62mm– 0,82 mm. Habitus slender and cylindrical, typical of the genus. Color of body white. Cuticle smooth, with primary granulation. Tergites of thorax and abdomen with 3,3/2,2,2,2,4 S-chaetae and 1,1/0,0,1 S-microchaetae formula.
Eyes missing. PAO long and narrow (22 µm) with slight constriction in the anterior middle part and three chaetae on the posterior region. Close to the postantennal organ, one semicircular area without convexity on external part, without pigment and with a finer texture than the surrounding area (Figs. 2) Cephalic chaetae subequal, the anterior and posterior are a little longer (Fig. 3)
Antennae slightly shorter than the head. Ratio antennae: head: = 1:1,4. Ant. IV with one subapical small organite on dorsal side, protected by curved chaeta and about eight sensilla (Fig. 4). Ant III with about 18 ordinary chaetae, two S-chaetae S3 and S4 (3µm); two guard S-chaetae S2 and S5 (7 µm) and with one short dorso-lateral sensillum S1 (3µm). Ant. II with about 16 ordinary chaetae, one ventro-external sensillum (5 µm) distally and 2 basal microchaetae, 1 dorsal and 1 ventral (Fig. 5). Ant. I with 11 ordinary chaetae, two subequal sensilla, one thicker (7µm) and one thinner (5 µm) on ventral side and two basal microchaetae, one dorsal and one ventral (Fig. 6). Ratio antennal segments: I: II: III: IV = 1: 1,5: 1,6: 2,7. Labral chaetae formula 2/5,5,4, anterior row inserted on papillae. Maxillary outer lobe with bifurcated palp and three sublobal hairs (Fig. 7). Labium with 3 proximal, 4 basomedial and 5 basolateral chaetae. Labial palps complete. Ventral head with 3+3 post-labial chaetae.
Body chaetae smooth and subequal; some longer laterally. Th II with 5+5 axial mesochaetae, 1+1 lateral macrochaetae (32 µm); 2+2 lateral largest sensilla, (11 µm), 1+1 smaller (5 µm) and 1+1 dorsal sensilla (12 µm); Th. III with 3+3 axial mesochaetae, 1+1 lateral macrochaetae (30 µm), 2+2 lateral sensilla (11 µm) and 1+1 dorsal sensilla (12 µm) Thorax without ventral chaetae. Abd. I with 3+3 axial mesochaetae, 1+1 lateral macrochaetae (30 µm) little longer than dorsal chaetae (29 µm), 1+1 lateral sensilla and 1+1 dorsal sensilla (12 µm) (Fig. 8). Abd. II with 3+3 axial mesochaetae, 1+1 lateral macrochaetae (32 µm), 1+1 lateral sensilla situated almost on ventral side (11 µm) and 1+1 dorsal sensilla (12 µm). Abd. III with 3+3 axial mesochaetae, 1+1 lateral macrochaetae (30 µm), 1+1 dorsal sensilla (12 µm), 1+1 lateral sensilla (12 µm) and 1+1 lateral microsensilla (5 µm) both situated on latero-ventral side. Abd. IV with 4+4 axial mesochaetae, 1+1 lateral macrochaetae (31µm) and 1+1 dorsal macrochaetae (29 µm), 1+1 dorsal sensilla (15 µm) and 1+1 lateral sensilla situated on latero-ventral side (12 µm). Dorsal sensilla on Abd I̅IV situated in mid-tergal position and dorsal sensilla on Abd. IV situated behind to the dorsal macrochaeta. Abd. V with 2+2 axial mesochaetae and one unpaired axial mesochaeta, 1+1 lateral macrochaeta (34 µm) and 1+1 dorsal macrochaeta (34 µm), 3+3 dorsal sensilla (20 µm) and 1+1 ventral (18 µm). Abd. VI some macrochaetae (35–40 µm) distributed among few mesochaetae, three unpaired chaetae (a0: 30 µm: m0: 38 µm: p0: 20 µm) (Fig. 9).
Appendages. Claws simple, without teeth (18 µm). Unguiculi reduced (4 µm) with a basal lamella and a short apical filament. Tita I, II, III with 20, 20, 21–22 chaetae, Femora I, II, III with 11, 11, 13 chaetae. Trochanter I, II, III with 8, 8, 6 chaetae. Tita I and II with unpaired chaetae B 4/5. Tita III with 7 chaetae in distal whorl with undifferentiated tenent chaetae (Fig. 10, 11). Ventral tube with 3+3 laterodistal and two posterior chaetae. Tenaculum with 3+3 teeth and no chaetae on corpus. Anterior furcal subcoxae with 5 chaetae, one longer than others and posterior subcoxae with 3 chaetae, one longer than others (Fig. 12). Manubrium (60µm) with 7+7 chaetae on posterior side and no chaeta on anterior side. Dens (30µm) with 3+3 anterior chaetae and no chaetae on posterior side. Mucro (10µm) bidentate, separated from dens (Fig.13). Ratio manubrium:dens:mucro as 1:3:6. Females genital plates with 1+1 microchaetae on anterior region.
Etymology. The name of the new species cariocus derives from the word ‘’carioca’’ originated from the Tupi indigenous language that means house of white man and actually refers to people born in the city of Rio de Janeiro.
description: Published as part of Mendonça, Maria Cleide De & Neves, Ana Carolina Da Rocha, 2020, New Brazilian species of Folsomides Stach (Collembola: Isotomidae), pp. 443-450 in Zootaxa 4896 (3) on pages 444-445, DOI: 10.11646/zootaxa.4896.3.5, http://zenodo.org/record/4384010