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(Female redundant descriptions removed)
Niarchos ligiae       Get publication

            Male (PBI_OON 414). Total length 1.32. CEPHALOTHORAX: Carapace orange, without any pattern, elongate oval in dorsal view, pars cephalica slightly elevated in lateral view, anteriorly narrowed to between 0.5 and 0.75 times its maximum width, with rounded posterolateral corners, posterolateral edge without pits, posterior margin not bulging below posterior rim, anterolateral corners with slightly sclerotized triangular projections, posterolateral surface without spikes, surface of elevated portion of pars cephalica smooth, sides finely reticulate, thorax without depressions, fovea absent, without radiating rows of pits; lateral margin straight, smooth, without denticles; plumose setae near posterior margin of pars thoracica absent; non-marginal pars cephalica setae dark, needle-like, present, scattered; non-marginal pars thoracica setae absent; marginal setae dark, needle-like. Clypeus margin slightly rebordered, curved downwards in front view, vertical in lateral view, low, ALE separated from edge of carapace by less than their radius, median projection absent; setae present, dark, needle-like. Chilum absent. Eyes six, well developed, posterior eyes only slightly reduced in size, ALE largest, all eyes oval; posterior eye row straight from above, procurved from front; ALE separated by less than their radius, ALE-PLE separated by less than ALE radius, PME separated by less than their radius, PLE-PME separated by less than PME radius. Sternum longer than wide, pale orange, uniform, not fused to carapace, median concavity absent, with radial furrows between coxae I-II, II-III, III-IV, furrow smooth, radial furrow opposite coxae III absent, surface smooth, without pits, microsculpture covering entire surface, sickle-shaped structures absent, anterior margin unmodified, posterior margin not extending posteriorly of coxae IV, anterior corner unmodified, lateral margin without infra-coxal grooves, distance between coxae approximately equal, extensions of pre-coxal triangles present, lateral margins unmodified, without posterior hump; setae sparse, dark, needle-like, densest laterally, originating from surface, without hair tufts. Mouthparts: Chelicerae, endites and labium pale orange. Chelicerae straight, anterior face with swelling; without teeth on both promargin and retromargin; fangs without tooth-like projections, directed medially, shape normal, without prominent basal process, tip unmodified; setae dark, needle-like, densest medially; paturon inner margin with scattered setae, distal region abruptly narrowed, posterior surface unmodified, promargin unmodified, inner margin unmodified, laminate groove absent. Labium triangular, not fused to sternum, anterior margin indented at middle, same as sternum in sclerotization; with 6 or more setae on anterior margin, subdistal portion with unmodified setae. Endites distally not excavated, serrula present in single row, anteromedian tip with one pair of backward pointing spines, posteromedian part unmodified, same as sternum in sclerotization, triangular anterior projections directed laterally. ABDOMEN: cylindrical, without long posterior extension, rounded posteriorly, inter-scutal membrane rows of small sclerotized platelets absent posteriorly; dorsum soft portions white, without color pattern. Book lung covers large, ovoid, without setae, anterolateral edge unmodified. Posterior spiracles connected by groove. Pedicel tube short, unmodified, scuto-pedicel region unmodified, scutum extending far dorsal of pedicel, plumose hairs absent, matted setae on anterior ventral abdomen in pedicel area absent, cuticular outgrowths near pedicel absent. Dorsal scutum strongly sclerotized, yellow, without color pattern, covering less than 1/2 of abdomen, less than 1/4 abdomen width, fused to epigastric scutum, middle surface finely reticulate, sides finely reticulate, anterior half without projecting denticles, reduced to tiny projection along midline. Epigastric scutum weakly sclerotized, surrounding pedicel, not protruding, small lateral sclerites absent. Postepigastric scutum weakly sclerotized, yellow, short, only around epigastric furrow, fused to epigastric scutum, anterior margin unmodified, without posteriorly directed lateral apodemes. Spinneret scutum present, incomplete ring, consisting of two small lateral patches bearing setae. Dorsum setae present, dark, needle-like. Epigastric area setae uniform, dark, needle-like. Postepigastric area setae present, dark, needle-like. Spinneret scutum with fringe of long setae. Dense patch of setae anterior to spinnerets absent. Interscutal membrane with setae. Colulus absent. LEGS: pale orange, without color pattern; femur IV not thickened, same size as femora I-III, patella plus tibia I shorter than carapace, tibia I unmodified, tibia IV specialized hairs on ventral apex absent, tibia IV ventral scopula absent, metatarsi I and II meso-apical comb absent, metatarsi III and IV weak ventral scopula absent. Leg spination (only surfaces bearing spines listed, all spines longer than segment width): tibiae: III, IV v0-0-1p. Tarsi I to IV superior claws tooth not examined in detail. Tarsi I to IV without inferior claw. Trichobothria not examined. GENITALIA: Epigastric region with sperm pore small, oval, situated at level of anterior spiracles, unmodified; furrow without omega-shaped insertions, without setae. Palp normal size, not strongly sclerotized, right and left palps symmetrical, proximal segments pale orange; embolus dark, prolateral excavation absent, embolar base with triangular projection on ventral side, hairlike projection on dorsal side; 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 about as long as femur, slightly larger than femur, without prolateral row of ridges, setae unmodified; tibia trichobothria not examined; cymbium pale orange, ovoid in dorsal view, completely fused with bulb, no seam visible, not extending beyond distal tip of bulb, plumose setae absent, without stout setae, without distal patch of setae; bulb pale orange, 1 to 1.5 times as long as cymbium, stout, elongated.
Niarchos ligiae, male habitus, anterior view (image by ND, specimen ID: ---00414)


Niarchos ligiae, male carapace, dorsal view (image by ND, specimen ID: ---00414)


Niarchos ligiae, male carapace, lateral view (image by ND, specimen ID: ---00414)


Niarchos ligiae, male habitus, dorsal view (image by ND, specimen ID: ---00414)


Niarchos ligiae, male habitus, lateral view (image by ND, specimen ID: ---00414)


Niarchos ligiae, male habitus, ventral view (image by ND, specimen ID: ---00414)


Niarchos ligiae, male palp, prolateral view (image by ND, specimen ID: ---00414)


Niarchos ligiae, male palp, retrolateral view (image by ND, specimen ID: ---00414)


Niarchos ligiae, male palp, ventral view (image by ND, specimen ID: ---00414)


Niarchos ligiae, male sperm pore, ventral view (image by ND, specimen ID: ---00414)


Niarchos ligiae, male sternum, ventral view (image by ND, specimen ID: ---00414)


Niarchos ligiae, male embolus, prolateral view (image by ND, specimen ID: ---00414)


Niarchos ligiae, male embolus, posterior view (image by ND, specimen ID: ---00414)


            Female (PBI_OON 430). Total length 1.68. As in male except as noted. CEPHALOTHORAX: Eyes posterior eyes only slightly reduced in size; posterior eye row procurved from above. Sternum sternum followed posteriorly by small ventral pedicel sclerite. Endites anteromedian tip unmodified. Female palp claws absent; spines absent; tarsus unmodified, patella without prolateral row of ridges. ABDOMEN: Pedicel scutum not extending far dorsal of pedicel. Dorsal scutum absent. Epigastric scutum not surrounding pedicel, without lateral joints. Postepigastric scutum not fused to epigastric scutum, with short posteriorly directed lateral apodemes. Spinneret scutum consisting of two small lateral plates bearing setae. LEGS: Leg spination (only surfaces bearing spines listed, all spines longer than segment width): tibiae: III, IV v0-0-2. Tarsi I to IV superior claws tooth not examined in detail. Trichobothria not examined. GENITALIA: Shape: anterior receptaculum with wide median sclerotization extending about as far anteriorly as rounded anterior margin; postepigastric scutum with relatively short median sclerotization, not reaching close to posterior spiracular groove.
Niarchos ligiae, female carapace, dorsal view (image by ND, specimen ID: ---00430)


Niarchos ligiae, female carapace, lateral view (image by ND, specimen ID: ---00430)


Niarchos ligiae, female epigynum, epigynal area, ventral view (image by ND, specimen ID: ---00430)


Niarchos ligiae, female habitus, anterior view (image by ND, specimen ID: ---00430)


Niarchos ligiae, female habitus, dorsal view (image by ND, specimen ID: ---00430)


Niarchos ligiae, female habitus, lateral view (image by ND, specimen ID: ---00430)


Niarchos ligiae, female habitus, ventral view (image by ND, specimen ID: ---00430)


Niarchos ligiae, female internal female genitalia, dorsal view (image by ND, specimen ID: ---00430)


Niarchos ligiae, female internal female genitalia, ventral view (image by ND, specimen ID: ---00430)


Niarchos ligiae, female sternum, ventral view (image by ND, specimen ID: ---00430)




Niarchos ligiae coordinates
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PBI USI Country State Division Locality Sex Type Status Elevation(m) GPS Coordinate Habitat Collection_Date Collector Inst. Code
PBI_OON 00000430  ECUADOR  Napo    Jatun Sacha Biological Station  1 Adult Female    410  -1.06597; -77.61672    01 Dec 2009  Niarchos Expedition, A. Santos, C. Rheims  IBSP 
PBI_OON 00000414  ECUADOR  Napo    Sacha Wagra Lodge, Rio Hollin  1 Adult Male  Holotype  665  -0.95500; -77.74750  litter  29 Nov 2009  Niarchos Expedition  QCAZ 

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The Field Museum of Natural History, Chicago   George Washington University, Washington DC
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