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(Female redundant descriptions removed)
Birabenella pizarroi       Get publication

            Female (PBI_OON 14992). Total length 1.64. CEPHALOTHORAX: Carapace orange, without any pattern, broadly oval in dorsal view, pars cephalica flat 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, 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, rebordered, 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 dark, needle-like; marginal setae dark, needle-like. Clypeus margin unmodified, curved downwards in front view, vertical in lateral view, high, ALE separated from edge of carapace by their radius or more, median projection absent; setae present, dark, needle-like. Chilum absent. Eyes six, well developed, the three diads on black pigment, ALE largest, all eyes circular; posterior eye row recurved from above, straight from front; ALE separated by more than their diameter, ALE-PLE separated by less than ALE radius, PME separated by less than their radius, PLE-PME separated by PME radius to PME diameter. Sternum as long as wide, uniform, not fused to carapace, median concavity absent, without radial furrows between coxae I-II, II-III, III-IV, surface smooth, without pits, microsculpture absent, sickle-shaped structures absent, anterior margin unmodified, posterior margin extending posteriorly beyond anterior edges of coxae IV as single extension, lateral margin without infra-coxal grooves, distance between coxae approximately equal, extensions of pre-coxal triangles absent, lateral margins unmodified, without posterior hump, orange; setae sparse, dark, needle-like, evenly scattered, originating from surface. Mouthparts: Chelicerae straight, anterior face with swelling; without teeth on both promargin and retromargin; fangs directed medially, shape normal, without prominent basal process, tip unmodified; setae dark, needle-like, evenly scattered; paturon distal region unmodified, posterior surface unmodified, promargin unmodified, inner margin unmodified, laminate groove absent. Labium not fused to sternum, anterior margin not indented at middle, subpentagonal; with 1 or 2 setae on anterior margin, subdistal portion with unmodified setae. Endites distally not excavated, serrula present in single row, anteromedian tip unmodified, posteromedian part unmodified, orange, strongly convergent. Female palp claws absent; spines absent; tarsus unmodified, patella without prolateral row of ridges, with enlarged setae in the tarsus. ABDOMEN: ovoid, without long posterior extension, rounded posteriorly, inter-scutal membrane rows of small sclerotized platelets absent posteriorly; dorsum soft portions pale orange, without color pattern. Posterior spiracles connected by groove. Pedicel tube short, unmodified, scuto-pedicel region unmodified, scutum absent, but abdomen not extending anterior of pedicel, plumose hairs absent, matted setae on anterior ventral abdomen in pedicel area absent, cuticular outgrowths near pedicel absent. Dorsal scutum absent. Epigastric scutum absent. Postepigastric scutum absent. Spinneret scutum absent. Dorsum setae present, dark, stout. Epigastric area setae uniform, dark, needle-like. Postepigastric area setae present, dark, needle-like. Dense patch of setae anterior to spinnerets absent. Colulus absent. LEGS: orange, without color pattern; femur IV not thickened, same size as femora I-III, patella plus tibia I near as long as 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 spines absent. Tarsi I to IV superior claws tooth examined in detail; tarsal proclaws and retroclaws inner face striate. Tarsi I to IV without inferior claw. Trichobothria examined with SEM; base rounded, aperture internal texture not grate-like, hood covered by numerous low, closely spaced ridges, hood and distal plates well differentiated. Tarsal organ with 3 sensilla visible, capsullate, opening intermediate between oval and a long slit. GENITALIA: Shape: anterior diverticle, with a thin lumen, associated to a transverse sclerite (with at least two pair of muscles attached). Advanced, and apparently attached to the sclerite, there is an anterior process with a transverse widened structure. These anterior elements together look like the complex known in other oonopids, as "Opopaea" fosuma Burger 2002 and Silhouettella loricatula (Roewer 1942), described in Burger et al (2003)and Burger et al (2006), and probably have some type of locking mechanism. The posterior receptaculum have the anterior wall strongly sclerotised, and internal W-shaped duct..
Birabenella pizarroi, female habitus, dorsal view (image by XG, specimen ID: ---14992)


Birabenella pizarroi, female habitus, ventral view (image by XG, specimen ID: ---14992)


Birabenella pizarroi, female habitus, lateral view (image by XG, specimen ID: ---14992)


Birabenella pizarroi, female carapace, anterior view (image by XG, specimen ID: ---14992)


Birabenella pizarroi, female carapace, dorsal view (image by XG, specimen ID: ---14992)


Birabenella pizarroi, female carapace, ventral view (image by XG, specimen ID: ---14992)


Birabenella pizarroi, female carapace, lateral view (image by XG, specimen ID: ---14992)


Birabenella pizarroi, female abdomen, ventral view (image by XG, specimen ID: ---14992)


Birabenella pizarroi, female epigynum, epigynal area, ventral view (image by XG, specimen ID: ---14992)


Birabenella pizarroi, female internal female genitalia, dorsal view (image by XG, specimen ID: ---14992)


Birabenella pizarroi, female claws, leg I, anterior view (image by XG, specimen ID: ---14992)


Birabenella pizarroi, female metatarsus I, dorsal view (image by XG, specimen ID: ---14992)


Birabenella pizarroi, female tarsus I, anterior view (image by XG, specimen ID: ---14992)


Birabenella pizarroi, female trichobothrium, metatarsus I, dorsal view (image by XG, specimen ID: ---14992)


Birabenella pizarroi, female tarsal organ, leg I, dorsal view (image by XG, specimen ID: ---14992)




Birabenella pizarroi 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 00014992  CHILE  Coquimbo - Region IV  Choapa  Los Vilos, near Quebrada de Quereo  1 Adult Female  Holotype  19  -31.92650; -71.51419  grassy field, Under rock  19 Aug 2009  C. Grismado, A. Ojanguren, J. Pizarro & F. Alfaro  MNSC 

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