Cyphoderus mucrostrimenus,

Oliveira, João Victor L. C., Alves, Jorge L. S. & Zeppelini, Douglas, 2017, Two new Cyphoderus (Collembola: Paronellidae) of “ tridenticulati ” and “ bidenticulati ” groups from Brazilian Amazon, Zootaxa 4350 (1), pp. 47-60: 54-58

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Cyphoderus mucrostrimenus

sp. nov.

Cyphoderus mucrostrimenus  sp. nov.

Figs 18–31View FIGURES 16 − 21. 16 − 17View FIGURES 22 − 24View FIGURES 25 − 29View FIGURES 30 − 31

Type material. Holotype, female on slide 5449, 23 I 2014. Brazil, Pará, Parauapebas , S 06°25’15.1”, W 56°18’53.6”, MSS, drilling hole, leg. Mise, KGoogleMaps  . Holotype deposited at the CRFS-UEPB, João Pessoa, Paraíba  . Paratype, juv. on slide 3643, 25 IV –03 V 2012. Brazil, Pará, Parauapebas S 6°06'19.2", W 50°07'09.4", Flona Carajás, soil surface, leg. Andrade et. al. deposited at CRFS-UEPBGoogleMaps  . Paratype, Male on slide 3165, 25 IV –03 V 2012. Brazil, Pará, Parauapebas , S 06°06'19.2", W 50°07'09.9", Flona Carajás, soil litter, surface, leg. Andrade et. alGoogleMaps  . Paratype deposited at MNURFJ.

Other material. See Table 2.

Description. Habitus typical of the genus, length 0.85 mm (average type specimens). Body color white. Eyes lacking, without ocular patch. Scales present on antennal segments I and II, head, body and furca (ventrally on manubrium, both sides on dens), and absent on legs and ventral tube.

Antennae ( Figs. 18–21View FIGURES 16 − 21. 16 − 17) 1.34 times the length of the head, segmentations I: II: III: IV as 1: 2.6: 2: 3.8. Sensilla present on all antennal segments; Ant. I ventrally with one microchaeta, one mesochaeta and five macrochaetae; dorsally with eight distal mesochaetae, and two macrochaetae, one mesochaeta and one sensillum in proximal portion ( Fig. 18View FIGURES 16 − 21. 16 − 17). Ant. II dorsally with five bristle-like sensilla ( Fig. 7CView FIGURES 1 − 7) and three sense rods ( Fig. 7AView FIGURES 1 − 7) in medial area; ventrally with one apical sense rod ( Fig. 7AView FIGURES 1 − 7) and eleven bristle-like sensilla ( Fig. 7CView FIGURES 1 − 7) these nine are arranged apically ( Fig. 19View FIGURES 16 − 21. 16 − 17); AIIIO ( Fig. 20View FIGURES 16 − 21. 16 − 17) with three apical bristle-like sensilla ( Fig. 7CView FIGURES 1 − 7) and two sense rods ( Fig. 7AView FIGURES 1 − 7). One pseudopore apically and one microsensillum ( Fig. 7BView FIGURES 1 − 7) on basis of antennal segment. Ant. IV apical bulb absent, dorsally with twelve bristle-like ( Fig. 7CView FIGURES 1 − 7) sensilla and ventrally with five bristle-like sensilla ( Fig. 7CView FIGURES 1 − 7) and one microsensillum ( Fig. 7BView FIGURES 1 − 7) ( Fig. 21View FIGURES 16 − 21. 16 − 17).

Head dorsal chaetotaxy ( Fig. 22View FIGURES 22 − 24) with three macrochaetae, one mesochaeta and two microchaetae at the An series; six chaetae at the A series (A0–A5); M2–M4, S0–S1–S2–S4–S 4i –S5–S 5i, Ps2–Ps3 present; posterior chaetae Pa1, Pa2, Pa5, Pa6 (bothriotrix), Pm2–Pm3, Pp1–Pp2–Pp3 and Pe2–Pe3 present. Labral, pre-labral and Lapial palps chaetae similar to C. mucrominimus  sp. nov. (as in Figs 6View FIGURES 1 − 7 and 8View FIGURES 8 − 10). Labial triangle formula M1 M2 r E L1–2 A1–4 ( Fig. 23View FIGURES 22 − 24).

Main macrochaetae on segments Th. II to Abd. IV as 00/0008+6. Body chaetotaxy as in Fig. 24View FIGURES 22 − 24. Th. II with a2, m1–2, m4–7, p1–6, p6e and one antero-lateral microchaeta. Th. III with m2, m7, m6p, p2–4, p6 and one anterolateral microchaeta. Abd. I with m2–m6 and as. Abd. II with two bothriotricha a5 and m2 surrounded by 2 and 3 fan-shaped chaetae respectively, m3e, a6–7, m3, m5–6, p6–7 and as present. Abd. III with three bothriotricha a5, m2, m5 surrounded by 3,3,2 fan-shaped chaetae respectively; a6–7, m3, pm6, am6, p6–7 present, microchaeta as as present and one extra sensillum near p6 chaetae. Abd. IV with three bothriotricha T2, T4 and E4 surrounded by 4,1,1 fan-shaped chaetae respectively; A4 and A5 with accessory sensillum. A3, A6, B3–6, C1, C1p, C2–4, T3, T5–7, D1, D1p, D3, De3, E1–4, E4p and F1 present, posterior row of chaetae at the distal edge of Abd. IV with 5+5 chaetae, 3+3 pseudopores present on the distal edge of the segment.

Legs ( Figs 25–29View FIGURES 25 − 29) without scales, trochanteral organ with 8 ciliated chaetae arranged in V-shape ( Fig. 27View FIGURES 25 − 29). Tibiotarsi with one tenent hair apically clavated ( Fig. 29View FIGURES 25 − 29). Claw broad, with one tooth in external lamella; a pair of inner basal teeth of unequal size and one unpaired subapical tooth ( Fig. 29View FIGURES 25 − 29). Unguiculi pointed and broad ( Fig. 29View FIGURES 25 − 29).

Ventral tube without scales, anteriorly with 4+4 macrochaetae, 1+1 proximal mesochaeta and 4+4 distal mesochaetae (2+2 anterior and 2+2 posterior), all ciliated ( Fig. 30View FIGURES 30 − 31).

Furcula ( Fig. 31View FIGURES 30 − 31). Manubrium 1.7 times as long as dens; Manubrial plate with 2 ciliate chaetae and 2 pseudopores. Dens 1.4 times longer than mucro, dorsally with 2 rows of feathered scales, 6 external and 3 internal, and 4 ciliated chaetae between the two rows; proximal outer part of dens with 3 ciliated chaetae and 2 smooth apical chaetae on ventral side, one at the base of each scale row. Mucro long, slender and clearly twisted, apically bidentate (aA).

Etymology. The name is taken from Greek στΡΙΜΜένα “ strimména ”, meaning “twisted”, in allusion to the shape of the mucro.

Distribution. The species was only found in Amazon Rainforest, at type locality, Parauapebas (Carajás), Pará State, northern Brazil.

Ecology. C. mucrostrimenus  sp. nov. was collected in MSS, three shallow caves and the surroundings epigeic soil and leaf litter, altitude between 500– 670m. The climate according to Köppen’s system is Af: Equatorial rainforest, fully humid ( Köppen 1936, Kottek et al. 2006).

Remarks. C. mucrostrimenus  sp. nov. differs from Brazilian bidenticulati Cyphoderus  ( C. agnotus  and C. similis  ) by the shape of the mucro which is long (at least 0.6× the length of dens) slender and clearly twisted in the new species. It can also be differentiated from those species by bearing a chaetae L 2 in labial triangle (absent in C. agnotus  and C. similis  ), TO with 8 chaeta (12~ 15 in C. agnotus  and 11~ 29 in C. similis  ), dens with 6 external and 3 internal feathered scales (6 external and 5 internal feathered scales in C. agnotus  and in C. similis  ).