Amazhomidia thaisae

Description. Total length (head + trunk) of specimens 2.04 ‒ 2.36 mm (n = 4), holotype 2.04 mm. Body with dark yellow color and dark purple pigment on distal two thirds of the Ant IV, distal and proximal Ant III, distal Ant I ‒ II weakly, Abd IV and femora distal bands and dorso-proximal manubrium; eyepatches black (Fig. 9). Scales heavily ciliated, short or elongated and apically pointed on dorsal and lateral head, thorax and abdomen dorsally. Antennae, legs, collophore and furcula unscaled. Head. Antennae slightly longer than trunk length, ratio antennae: trunk = 1: 0.84; antennal segments ratio as I: II: III: IV = 1: 1.69: 1.32: 2.47 (Fig. 9). Ant IV annulated on distal three quarters, without apical bulb, with s-blunt sens of different sizes and ciliate chaetae (Figs 3 A ‒ B). Ant III sense organ with 2 rods, 4 spiny guard sensilla, with s-blunt sens of different sizes and ciliate chaetae; subapical scale-like chaeta present (as in Figs 3 C and 13 A). Ant I dorsally with 4 median mac, 5 distal mes and 3 smooth mic at base (Fig. 13 B). Eyes 8 + 8, G and H smaller, A and B larger, with 5 interocular chaetae (s absent). Head dorsal chaetotaxy (Fig. 13 C) with 9 ‘ An’, 4 ‘ A’ (A 3 mac or mic), 3 ‘ M’ (M 1 absent), 7 ‒ 8 ‘ S’ (S 1 absent, S 2 e sometimes absent), 2 ‘ Ps’, 3 ‘ Pi’ (Pi 1 displaced forwards or backwards), 4 ‒ 5 ‘ Pa’ (Pa 1 rarely present), 2 ‘ Pm’, 4 ‘ Pp’ (p 4 absent) and 2 ‒ 3 ‘ Pe’ (Pe 3 p sometimes absent) chaetae, plus 3 lateral mac of uncertain homology. Clypeal formula with 4 (l 1 ‒ 2), 8 (frontal), 3 (pf 0 ‒ 1) chaetae finely ciliate, l 1 ‒ 2 and pf 0 ‒ 1 larger, 3 frontal smaller and ciliate, others subequal. Four prelabral smooth chaetae, internal pair bifurcated equally (Fig. 13 D); labral formula with 4 (a 1 – 2), 5 (m 0 – 2), 5 (p 0 – 2) smooth chaetae, a 1 not thickest, p 0 – 2 largest. Labral papillae absent. Labial palp with five main papillae (A ‒ E) plus one hypostomal papilla (H) with 0, 5, 0, 4, 4, 2 guard appendages, respectively, lateral process (l. p.) of papilla E finger-shaped and not reaching the papilla base; labium with five smooth proximal chaetae (p. c.) (as in Figs 25 B ‒ C). Maxillary palp with smooth apical appendage (a. a.) and basal chaeta (b. c.) subtly ciliated, thicker and 1.16 longer than the apical; sublobal plate with tree smooth appendages (Fig. 18 C). Basomedian and basolateral labial fields with chaetae a 1 - 5, m 1, r, e, l 1 ‒ 2 smooth, r smaller present or not (Fig. 10 A). Ventral head with numerous chaetae finely ciliate of different sizes, 8 anterior postlabial chaetae; cephalic groove with 1 + 1 scale-like chaetae and 10 ‒ 11 surrounding chaetae finely ciliate, 1 median chaeta larger and 1 ‒ 2 smaller, others subequal (Figs 10 A ‒ B). Thorax chaetotaxy (Figs 14 A ‒ B). Th II (anterior chaetal collar omitted) series ‘ a’, ‘ m’ and ‘ p’ with 10 ‒ 11 (5 of uncertain homology), 4 ‒ 6 and 9 ‒ 14 mac respectively. Th III, series ‘ a’, ‘ m’ and ‘ p’ with 4 (a 3 absent), 1 (m 6 absent) and 7 ‒ 8 mac respectively, p 1 absent on one side in holotype. Ratio Th II: III = 1.73 ‒ 1.43: 1 (n = 4), holotype 1.43: 1. Abdomen chaetotaxy (Figs 14 C ‒ E, 15 A ‒ E). Abd I with 3 central (m 2 ‒ 4) and 1 lateral (m 5) mac. Abd II with 2 ‒ 3 central mac (m 3 ‒ 3 e, 3 ep) and 2 lateral mac (m 5 ‒ 6?), bothriotricha a 5 and m 2 with 11 and 8 accessory chaetae respectively. Abd III with 1 central mac (m 3) and 2 lateral mac (pm 6 and p 6), bothriotricha a 5, m 2 and m 5 with 10, 9 and 12 accessory chaetae respectively. Abd IV with 7 ‒ 10 anteromedian mac, 9 ‒ 16 posteromedian mac (holotype with 9 - 10, A 4 absent), 10 lateral mac, about 12 mes (3 anterolateral and 9 posterior), about 10 posterior sens (as? and ps type I, others type II) and approximately 16 posterior mes. Abd V series ‘ m’ and ‘ p’ with 4 and 3 mac respectively. Ratio Abd III: IV = 1: 6.40 ‒ 7.59 (n = 4), holotype 1: 7.59. Notes: (C) ciliated chaeta (e); (S) smooth chaeta (e); (B) bifurcate chaeta (e); (psp) pseudopore; (+) present; (–) absent. Reference: (1) Womersley 1930, (2) Zhang et al. 2009, (3) Cipola et al. 2016. * A 3 chaeta presented in Cipola et al. 2016 is actually A 2. Legs. Subcoxa I (outer side) with 2 chaetae and 2 psp; subcoxa II with an anterior row of 9 chaetae plus about 12 anterior chaetae, posterior row of 3 chaetae and 4 psp; subcoxa III with one row of 7 ‒ 8 chaetae and 2 posterior psp (Figs 16 A ‒ C). Trochanteral organ with about 25 spine-like chaetae, 2 arms posteriorly; anterior face with 6 ‒ 7 spine-like chaetae (Figs 16 D ‒ E). Femora I ‒ III internally with 2 mac (proximal and median) and 1 distal mes finely ciliate and apically acuminate; tibiotarsi I ‒ III internally with 1 proximal mac and 1 median mes finely ciliate and apically slightly acuminate, others subequal (Fig. 11 A). Pretarsus with one minute smooth chaeta on anterior and posterior sides. Ungues outer side with a pair of large laterobasal teeth; inner side with 3 teeth, 2 paired basal and 1 unpaired median slightly larger to basal teeth, apical tooth absent. Unguiculi I ‒ II truncate, unguiculus III weakly truncate, all with one small proximal external tooth, other smooth edges; ratio unguis: unguiculus III = 1: 0.58. Tibiotarsus III distally with one inner smooth chaeta 1.26 larger than unguiculus; outer side with tenent hair capitate, smooth and 0.85 smaller than unguis. Collophore. Anterior side with about 23 chaetae finely ciliate, distally 3 mac; posterior side with numerous chaetae finely ciliate, 1 unpaired chaeta medially larger, one pair distally smooth; lateral flap with about 14 smooth chaetae (Figs 11 B, 16 F). Furcula. Manubrium ventrally with 2 subapical and about 28 apical chaetae ciliate per side; manubrial plate with 7 chaetae finely ciliate of different sizes and 2 psp; lateral side with 5 ‒ 6 long distal mac finely ciliate (Figs 12 A ‒ B, 16 G ‒ H). Basal two thirds of dens with 22 ‒ 33 (holotype with 32 ‒ 33) dorsal spines striated on irregular inner row; dorsal side with three irregular rows of chaetae finely ciliate, proximal chaetae larger (Figs 12 A and C, 16 I). Mucro bidentate with apical tooth subequal to proximal tooth, basal spine surpassing the apex of the proximal tooth (Fig. 12 D).

Diagnosis. Body dark yellow with dark purple bands on Ant II and Abd IV and femora distally (Fig. 9); appendages unscaled; Ant IV without apical bulb; Ant III with one subapical scale-like chaeta; Ant I dorsally with 4 median mac; prelabral inner chaetae smooth and bifurcated equally; Gr. II ‒ III of head with 5 ‒ 6 and 3 mac respectively, M 1 and S 1 mac absent; basomedian labial field without M 2; cephalic groove with 1 + 1 scale-like chaetae (Figs 10, 13 B ‒ D); Th II without m 2, m 2 i and m 4 p mac; Th III ‒ Abd III with 12 ‒ 13, 4, 4 ‒ 5 and 3 mac respectively; Abd IV with 16 ‒ 26 median mac and 10 lateral mac (Figs 14, 15 A ‒ D); unguiculi I ‒ II truncate, III weakly truncate; manubrium ventrally with 28 apical chaetae and 5 ‒ 6 long distal mac on lateral side; manubrial plate with 7 chaetae and dens with 22 ‒ 33 dorsal spines (Figs 12 A ‒ C, 16 G ‒ I).

Remarks. Amazhomidia thaisae sp. nov. resembles Amazhomidia ducke Cipola & Bellini, 2016 by appendages unscaled, prelabral inner chaetae bifurcated equally, head cephalic groove with 1 + 1 scale-like chaetae, empodial complex shape and mucro bidentate with basal spine. However, A. thaisae sp. nov. differs from this species by dark yellow body color with dark distal bands on Abd IV and femora, while A. ducke has a completely blue body with some depigmented regions. Amazhomidia thaisae sp. nov. differs also by Ant I dorsally with 4 median mac (7 in A. ducke), manubrium ventrally with 28 apical chaetae (38 in A. ducke), manubrial plate with 7 chaetae (11 in A. ducke), and dens with 22 ‒ 33 dorsal spines (38 in A. ducke). The dorsal chaetotaxy of A. thaisae sp. nov. differs by 5 ‒ 6 mac on Gr. II of the head (4 in A. ducke), Th II with 10 ‒ 11 anterior mac (28 ‒ 29 in A. ducke), and Abd III with 2 lateral mac (3 in A. ducke). Other comparisons among species are presented in Table 1.

Etymology. The new species is named after Msc. Thais Vicente (INPA), friend of the first author and collectors of the specimens.

Type material. Holotype female on slide (067 / INPA): Brazil, Amazonas, Manaus municipality, Reserva Ducke, grid L 8 - 3500, 02 ° 59 ’ 05 ” S, 59 ° 55 ’ 42 ” W, Amazon forest, 67 m, 23. ix- 04. xi. 2014, pitfall-trap of 48 hours, T Vicente coll. 6 paratypes on slides (067 A ‒ F / INPA): 2 males, 3 females and 1 juvenile and 6 specimens in alcohol, same data as holotype. 1 paratype in alcohol (INPA): same data as holotype, except grid L 5 - 4500, 02 ° 57 ’ 24 ” S, 59 ° 55 ’ 24 ” W, 113 m. 1 paratype in alcohol (INPA): same data as holotype, except grid L 5 - 2500, 02 ° 57 ’ 35 ” S, 59 ° 56 ’ 30 ” W, 102 m, 15. ix- 20. v. 2006, JLP Souza coll.