Folsomides cariocus, Mendonça & Neves, 2020

Mendonça, Maria Cleide De & Neves, Ana Carolina Da Rocha, 2020, New Brazilian species of Folsomides Stach (Collembola: Isotomidae), Zootaxa 4896 (3), pp. 443-450 : 444-445

publication ID	https://doi.org/ 10.11646/zootaxa.4896.3.5
publication LSID	lsid:zoobank.org:pub:1494879F-E977-40C7-AADA-484D9994CC9C
DOI	https://doi.org/10.5281/zenodo.4389302
persistent identifier	https://treatment.plazi.org/id/8C6A711C-FFC0-B73A-D8A8-F757D4BFDC5F
treatment provided by	Plazi
scientific name	Folsomides cariocus
status	sp. nov.

Treatment

Folsomides cariocus sp. nov.

Figs 2 View FIGURE 2–8 ̅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 View FIGURE 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 View FIGURE 2–8 ) Cephalic chaetae subequal, the anterior and posterior are a little longer ( Fig. 3 View FIGURE 2–8 )

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 View FIGURE 2–8 ). 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 View FIGURE 2–8 ). 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 View FIGURE 2–8 ). 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 View FIGURE 2–8 ). 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 View FIGURE 2–8 ). 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 View FIGURE 9–13 ).

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 View FIGURE 9–13 ). 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 View FIGURE 9–13 ). 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 View FIGURE 9–13 ). 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.