Amazhomidia ducke Cipola & Bellini, 2016

Cipola, Nikolas Gioia, Morais, José Wellington De & Bellini, Bruno Cavalcante, 2018, New species, redescriptions and a new combination of Acanthocyrtus Handschin, 1925 and Amazhomidia Cipola & Bellini, 2016 (Collembola, Entomobryidae, Entomobryinae), Zootaxa 4387 (3), pp. 401-435 : 425-427

Amazhomidia ducke Cipola & Bellini, 2016

Figs 21‒23

Additional material. 2 juveniles on slides and 5 specimens in alcohol ( INPA): Brazil, Amazonas, Manaus, Reserva Ducke, grid L4-500, 02°57’13"S, 59°57’39"W, 61 m, 23.vi‒06.viii.2012, pitfall-traps, A Oliveira coll.

Description of juvenile 2nd. instar. Total length (head + trunk) of specimens 0.9 mm. Specimens pale white with dark blue pigments on Ant IV and mostly III, Ant II ventrally, anterior and lateral head, lateral of Th II to Abd III, posterior Abd IV, coxa III, femora with one distal band and manubrium completely (Fig. 21). Body without scales.

Head. Antennae smaller than trunk length (Fig. 21), ratio antennae: trunk = 1: 1.43; antennal segments ratio as I: II: III: IV = 1: 1.75: 1.61: 3.77. Ant IV weakly annulated on distal half, without apical bulb (Fig. 22A). Ant III with subapical scale-like chaeta (Figs 22A‒B). Ant I dorsally with 1 median mac and 3 smooth mic at base. Eyes 8+8, G and H smaller, A and B larger, with 3 interocular chaetae (v, p and t). Head dorsal chaetotaxy (Fig. 23A) with 5 ‘An’, 4 ‘A’, 4 ‘M’ (M1 absent), 7 ‘S’ (S2e and S 6i absent), 2 ‘Ps’, 1 ‘Pi’, 4 ‘Pa’, 2 ‘Pm’, 4 ‘Pp’, and 2 ‘Pe’ chaetae. Four prelabral smooth chaetae, internal pair bifurcated distally or normal (Fig. 23B); labral formula similar to adults. Labral papillae absent. Basomedian and basolateral labial fields with all chaetae smooth, r absent . Ventral head with reduced chaetotaxy, cephalic groove with 1+1 scale-like chaetae.

Thorax chaetotaxy (Figs 23C). Th II series ‘a’, ‘m’ and ‘p’ with 12, 13 and 8 chaetae respectively. Th III, series ‘a’, ‘m’ and ‘p’ with 4, 2 and 8 chaetae respectively. Ratio Th II: III = 2.24: 1.

Abdomen chaetotaxy (Fig. 23D). Abd I series ‘a’, ‘m’ and ‘p’ with 1, 5 and 1 chaetae respectively. Abd II series ‘a’, ‘m’ and ‘p’ with 1, 4 and 3 (1 unnamed) chaetae respectively. Abd III series ‘a’, ‘m’ and ‘p’ with 2, 5 and 1 chaetae respectively. Abd IV ‘A’ series with 4, ‘B’ series with 5, ‘Be’ series with 1, ‘C’ series with 1, ‘T’ series with 4, ‘D’ series with 1, ‘E’ series with 4, and ‘F’ series with 3 chaetae; posterior side with about 8 posterior sens (ps type I, others type II) and 4 posterior mes. Abd V as adults. Ratio Abd III: IV = 1: 8.46.

FIGURE 21. Amazhomidia ducke : hAbITUS Of JUVENILE Of 2nd. INSTAR IN ALcOhOL (LATERAL VIEW). ScALE bAR: 0.3 MM.

Legs. Trochanteral organ with 2 spine-like chaetae; anterior face without spine-like chaetae. Chaetotaxy of femora and tibiotarsi reduced, but with larger chaetae finely ciliate (Fig. 22C). Morphology of the empodial complexes I‒III as adults, but unguiculi I‒III truncate (Fig. 22D).

Furcula. Manubrium ventrally with 2 subapical and 5 apical chaetae on transverse row; manubrial plate without chaetae but with 2 psp; lateral side with 1 distal and 1 subapical long mac finely ciliate. Dental spines absent, only rows of chaetae finely ciliate (Fig. 22E). Mucro bidentate with apical tooth larger than proximal tooth, basal spine not surpassing the apex of the proximal tooth.

Remarks: In the original description of A. ducke some characteristics have not been observed but are present in juveniles as well as adults: Ant III laterally with one subapical scale-like chaeta and tergal macrochaetae heavily ciliated and apically foot-shaped, typical of Entomobryinae (Figs 22B, 24C). In addition, some chaetae were mistakenly named on head A3 is A2, S1 is S2 (S1 absent), S2 is S2e, S6 is S 6i, S7 is S6, Ps3 is Ps5 and on Gr. III is Pi1, Pi2 and Pi3 (Pa1 and Pm2 absent). On Th III m5p is a6, while on Abd II a6? is m6. The unguiculus III was reported as acuminate, but is weakly truncate on inner side as well as in the other species of Amazhomidia . The original mistake was made possibly due to arrangement of the specimens on slide assembly.

FIGURE 22A–E. Amazhomidia ducke : JUVENILE Of 2nd. INSTAR; A, RIGhT ANT I‒IV (DORSAL SIDE), ARROW INDIcATES SUbAPIcAL ScALE- LIKE chAETA Of ANT III; B, SUbAPIcAL ScALE-LIKE chAETA Of RIGhT ANT III IN DETAIL (DORSAL SIDE); C, RIGhT TIbIOTARSUS III (ANTERIOR SIDE); D, DISTAL TIbIOTARSUS AND EMPODIAL cOMPLEX III (POSTERIOR VIEW); E, DISTAL MANUbRIUM, DENTES AND MUcRO (DORSAL VIEW). ScALE bARS: A, C, E (0.05 MM), B, D (0.01 MM).

FIGURE 23A–D. Amazhomidia ducke : DORSAL chAETOTAXY Of JUVENILE Of 2nd. INSTAR; A, hEAD; B, PRELAbRUM AND cLYPEUS; C, Th II AND III; D, AbD I‒IV.