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OONOPIDAE SPECIES DESCRIPTION
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Birabenella chincha       Get publication



            Male (PBI_OON 49999). CEPHALOTHORAX: Carapace pale orange, without any pattern, ovoid 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, anterolateral corners without extension or projections, posterolateral surface without spikes, surface of elevated portion of pars cephalica smooth, sides smooth, 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 light, needle-like, present, scattered; non-marginal pars thoracica setae light, needle-like; marginal setae light, needle-like. Clypeus margin unmodified, 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, light, needle-like. Eyes six, well developed, on dark area, ALE largest, all eyes oval; posterior eye row straight from above, procurved from front; ALE separated by their radius to diameter, ALE-PLE separated by less than ALE radius, PME separated by less than their radius, PLE-PME separated by less than PME radius. Sternum as long as wide, pale orange, uniform, not fused to carapace, median concavity absent, with radial furrows between coxae I-II, II-III, III-IV, furrow smooth, surface smooth, without pits, microsculpture absent, 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 absent, lateral margins unmodified, without posterior hump; setae sparse, light, needle-like, evenly scattered, originating from surface, without hair tufts. Mouthparts: Chelicerae, endites and labium pale orange. Chelicerae straight, anterior face unmodified; fangs without tooth-like projections, directed medially, shape normal, without prominent basal process, tip unmodified; setae light, needle-like, evenly scattered; paturon distal region unmodified, posterior surface unmodified, promargin unmodified, inner margin unmodified, laminate groove absent. Labium elongated hexagon, not fused to sternum, anterior margin not indented at middle, same as sternum in sclerotization; with 1 or 2 setae on anterior margin, subdistal portion with unmodified setae. Endites distally not excavated, anteromedian tip unmodified, posteromedian part unmodified, same as sternum in sclerotization, endite with a lateral furrow that bisects it in two parts, dorsal and ventral; with two darkened, curved setae on the tip, the larger one with a twisted apex.. ABDOMEN: ovoid, without long posterior extension, rounded posteriorly, inter-scutal membrane rows of small sclerotized platelets absent posteriorly; dorsum soft portions pale white, without color pattern. Book lung covers small, without setae, anterolateral edge unmodified. Posterior spiracles connected by groove. Pedicel 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, light, needle-like. Epigastric area setae uniform, light, needle-like. Postepigastric area setae present, light, needle-like. Dense patch of setae anterior to spinnerets absent. Colulus absent. LEGS: pale 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 not examined in detail. Tarsi I to IV without inferior claw. Trichobothria not examined. Tarsal organ tarsal organ of the palp with proximal ridge and two receptors, one larger and other smaller.. GENITALIA: Epigastric region with sperm pore not visible; furrow without omega-shaped insertions, without setae. Palp normal size, not strongly sclerotized, right and left palps symmetrical, proximal segments pale orange; embolus light, prolateral excavation absent; trochanter normal size, unmodified; femur normal size, one to two times as long as trochanter, without posteriorly rounded lateral dilation, attaching to patella basally; patella shorter than femur, not enlarged, setae unmodified; cymbium pale orange, ovoid in dorsal view, not fused with bulb, 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, tapering apically, middle part fundus oval, in the center of the spherical base of the bulb, from where arises the weakly sclerotized seminal duct; gently curved along almost all its length., distal part two flattened, compressed, distal projections of the bulb thar arise from an alveolus: one on the prolateral side, bent to ventral (on where the embolus opening is presumably located), and another one widened, ventrally directed, and more membranous. The digitiform projection on the ventral part of the bulb, near the distal part, is curved to the retrolateral side..

            Female (PBI_OON 49999). As in male except as noted. CEPHALOTHORAX: Eyes on dark area. Endites . Female palp claws absent; spines absent; tarsus unmodified. LEGS: Leg spines absent. Tarsi I to IV superior claws tooth not examined in detail. Trichobothria not examined. Tarsal organ tarsal organ of the leg I with inconspicuous proximal ridge,apparently with only one receptor.. GENITALIA: Dorsal view: anterior sclerite large, nearly spherical, apparently with a lumen; two thin consecutive transverse sclerotized bars separate it from the posterior part of the genitalia, that have a strongly recurved sclerotized bar, that appears as two curved, scimitar-shaped branches (with muscle insertions on the middle of each branch); copulatory opening led apparently to the thick walled anterior copulatory duct, that runs gently sinuously before to connecting with the posterior receptacle. The latter have an anterodorsal wall thickened, with reticulated surface and irregular shape; inside it, a tube that describes two loops to the posterior part and joining in the anteromedian part..
 

DISTRIBUTION

PERU
Birabenella chincha coordinates
Click the following link for a map from Discover Life which displays the records below. You can click anywhere on that map to zoom in, and clicking on any point will display the full data for that locality Birabenella chincha, Discover Life Map
 

MATERIAL EXAMINED
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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 00049998  PERU  Ica  Pisco  Pisco  1 Adult Female      -13.70000; -76.18333    01 Apr 2011  Giraldo A.  MEKRB 
PBI_OON 00049999  PERU  Ica  Pisco  Pisco  3 Adult Female  Paratype    -13.70000; -76.18333    01 Sept 2011  Giraldo A.  MEKRB 
PBI_OON 00049999  PERU  Ica  Pisco  Pisco  2 Adult Male  Paratype    -13.70000; -76.18333    01 Sept 2011  Giraldo A.  MEKRB 
PBI_OON 00049999  PERU  Ica  Pisco  Pisco  1 Adult Male  Holotype    -13.70000; -76.18333    01 Sept 2011  Giraldo A.  MEKRB 


 
 
 
 
The American Museum of Natural History, New York, in collaboration with
The California Academy of Sciences, San Francisco   The University of California, Berkeley
The Field Museum of Natural History, Chicago   George Washington University, Washington DC
 
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This material is based upon work supported by the National Science Foundation under Grant No. DEB 0613754. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
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