Amazoonops gen. nov.

Type Species. Amazoonops caxiuana sp. nov.

Etymology. The generic name is a contraction between Amazon and Oonops and is masculine in gender.

Diagnosis. Amazoonops gen. nov. is considered a member of the Varioonops complex, since the species of the new genus share with those of Varioonops, Ponsoonops and Bipoonops [sensu Bolzern & Platnick (2013) and Bolzern (2014)] the sexually dimorphic abdominal dorsal scuta, present in males and absent in females, as well as a well-defined cymbium, separated form the bulbus by a deep seam (Figs 39, 46, 47). Species of Amazoonops differ from the members of the above cited genera by the presence of deep sternal pits in both males and females (Figs 7–9, 13–16). Males are further distinguished by the smooth (not patterned) abdomen (Figs 19–21) and the narrow cymbium and inflate, subquadrate bulbus, with simple embolus and no well-defined conductor (Figs 38– 43; 46–47). Females can be also distinguished from all other Oonopidae by the incomplete epigastric scutum ring around pedicel (Figs 55, 88, 127).

Description. CEPHALOTHORAX: Carapace without any pattern, pars cephalica slightly elevated in lateral view, posterolateral edge without pits, posterior margin not bulging below posterior rim, anterolateral corners without extension or projections, posterolateral surface without spikes, sides granulate, thorax without depressions, fovea absent, without radiating rows of pits; lateral margin straight, rebordered, with blunt denticles; plumose setae near posterior margin of pars thoracica absent; non-marginal pars cephalica setae needle-like; non-marginal pars thoracica setae needle-like; marginal setae needle-like (Figs 1–2, 35, 61). Clypeus margin slightly rebordered, sinuous in frontal view, vertical in lateral view, median projection absent; setae present, needle-like. Chilum absent (Figs 3–4). Six eyes, well developed, all subequal, ALE circular, PME oval, PLE circular; posterior eye row recurved; ALE separated by less than their radius (Figs 2–4; 35–36). Sternum longer than wide, uniform, fused to carapace, median concavity absent, with radial furrows between coxae I–II, II–III, III–IV, radial furrow opposite coxae III absent, microsculpture covering entire surface, sickle-shaped structures absent, posterior margin not extending coxae IV posteriorly, anterior corner unmodified, distance between coxae approximately equal, extensions of pre-coxal triangles absent, lateral margins unmodified, without posterior hump; setae sparse, needlelike, originating from surface, without hair tufts (Figs 7–9, 13–16, 17, 37), anterior margin unmodified; parapedicelar organ present (Figs 11–12). Mouthparts: chelicerae, endites and labium orange-brown. Chelicerae slightly divergent, anterior face unmodified; fangs without tooth-like projections, directed medially, shape normal, without prominent basal process, setae needle-like, evenly scattered; tip, paturon posterior surface, promargin and inner margin unmodified. Labium not fused to sternum, anterior margin indented at middle, same as sternum in sclerotization; subdistal portion with unmodified setae. Endites distally not excavated, serrula present in single row, posteromedian part unmodified, same as sternum in sclerotization (Figs 2–3, 10, 18, 44, 78, 101, 118). Palpal claws absent; spines absent; tarsus unmodified in females (Figs 52, 86). ABDOMEN: ovoid, without long posterior extension, rounded posteriorly, inter-scutal membrane rows of small sclerotized platelets absent posteriorly; dorsum soft portions without color pattern in males. Color pattern composed by few (Fig. 54) to many black dorsal spots in females (Figs 89, 124). Book lung covers large, ovoid, without setae, anterolateral edge unmodified, pedicel ribbed, scuto-pedicel region unmodified, scutum extending far dorsal of pedicel (Figs 21–22); plumose hairs, matted setae on anterior ventral abdomen in pedicel area and cuticular outgrowths near pedicel absent in males. Pedicel tube short in females (Figs 56, 91, 129). Dorsal scutum strongly sclerotized, without color pattern, not fused to epigastric scutum, anterior half without projecting denticles (Figs 19, 21); absent in females (Figs 54– 55). Epigastric scutum strongly sclerotized, completely surrounding pedicel, not protruding, small lateral sclerites absent (Fig. 22). In females epigastric scutum only partially surrounding pedicel (Figs 55, 88, 127), without lateral joints. Postepigastric scutum strongly sclerotized, fused to epigastric scutum, anterior margin unmodified in males (Fig. 20); in females postepigastric scutum pale orange, short, only around epigastric furrow (Figs 54; 56, 88, 91). Spinneret scutum absent. Supra-anal scutum absent. Dorsum setae present, needle-like. Epigastric area setae uniform, needle-like. Postepigastric area setae present, needle-like. Spinneret scutum without fringe of setae. Dense patch of setae anterior to spinnerets absent. Interscutal membrane with setae. Colulus represented only by setae (Fig. 110). LEGS: without color pattern in males, pale orange in females. Femur IV not thickened, same size as femora I–III, tibia I unmodified, tibia IV specialized hairs on ventral apex present, tibia IV ventral scopula absent, metatarsi III and IV weak ventral scopula absent; leg spines absent (Figs 24–25). Tarsal proclaws and retroclaws inner face smooth; tarsus I superior claws with four teeth on lateral surface of proclaw, one tooth on median surface of proclaw, four teeth on lateral surface of retroclaw, one tooth on median surface of retroclaw; tarsus IV superior claws with two teeth on lateral surface of proclaw, one tooth on median surface of proclaw, two teeth on lateral surface of retroclaw (Figs 28–31). Patella plus tibia I shorter than carapace and metatarsi I and II meso-apical comb absent. Trichobothria base longitudinally narrowed, hood smooth. Tarsal organ with 2 (leg IV) to 3 (leg I) visible sensilla (Figs 26–27). GENITALIA: male epigastric region with sperm pore small, oval, unmodified; furrow without omega-shaped insertions, without setae (Fig. 20). Palp normal size, not strongly sclerotized, right and left palps symmetrical, proximal segments pale orange; trochanter normal size, unmodified; femur normal size, two or more times as long as trochanter, without posteriorly rounded lateral dilation, attaching to patella basally; patella shorter than femur, not enlarged, without prolateral row of ridges, setae unmodified; cymbium pale orange, narrow in dorsal view, not fused with bulb, not extending beyond distal tip of bulb, plumose setae absent, without stout setae and distal patch of setae; bulb stout, spherical, with short subtriangular retrolateral projection near base of embolus. Embolus usually coiled, with prolateral and subdistal aperture (Figs 38–43; 46– 49). Female with large posterior receptaculum; anterior receptaculum almost squared; two short posteriorly directed apodemas; short and sinuous transversal sclerite (Figs 130–132).

Species Included. Amazoonops almeirim sp. nov., A. cachimbo sp. nov., A. caxiuana sp. nov., A. ducke sp. nov. and A. juruti sp. nov.

Distribution. Known from states of Amazonas and Pará, Brazil.