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OONOPIDAE SPECIES DESCRIPTION
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(Female redundant descriptions removed)
Melchisedec birni       Get publication



            Female (PBI_OON_34105). Total length 1.48. CEPHALOTHORAX: Carapace orange, without any pattern, 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, posterolateral surface without spikes, surface of elevated portion of pars cephalica smooth, thorax without depressions, carapace longer than wide, anteriorly narrowed to approximately 0.5 times its maximum width,lateral surfaces covered with dense, reticulate microsculpture, without radiating rows of pits; lateral margin straight, rebordered; non-marginal pars cephalica setae on dorsal surface of carapace a U-shaped row of approximately 16 setae and a central row of about four setae. Clypeus curved downwards in front view, high, ALE separated from edge of carapace by their radius or more, median projection absent, clypeus high, ALE separated from edge of carapace by more than their length; setae present, eight needle-shaped setae on clypeus: four antero-medially projecting setae near margin; two upward-projecting setae situated centrally on clypeus; two medially-projecting setae situated anterior of ALE. Eyes six, well developed, aLE wider than long, PME longer than wide, PLE longer than wide. ALE separated by less than their diameter. Just outside each ALE a medially projecting seta, no setae between ALE, between each PME and PLE a medially projecting seta, all eyes oval; posterior eye row recurved from above; ALE-PLE separated by less than ALE radius, PME touching, PLE-PME separated by less than PME radius. Sternum as long as wide, pale orange, uniform, fused to carapace, median concavity absent, with radial furrows between coxae I-II, II-III, III-IV, without pits, microsculpture longitudinal band, sickle-shaped structures absent, anterior margin unmodified, posterior margin not extending posteriorly of coxae IV, without posterior hump, a median band of reticulated microsculpture extends along length of sternum. Furrows covered with reticulated microsculpture. Posteriormost setae arranged in two longitudinal rows of two-three setae each. Coxal insertions I, II and III each with two clusters of small openings; coxal insertion IV without clusters. A curved, dark-red ridge between each coxal insertion IV and the pedicel; setae abundant. Mouthparts: Chelicerae anterior face unmodified; setae anterior face of paturon bearing relatively few setae. Endites anteromedian tip unmodified, posteromedian part unmodified, endites converging but tips not touching. Female palp spines absent; tarsus unmodified, patella without prolateral row of ridges, tibia longer than patella, on dorsal surface three trichobothria, prolateral surface presenting two pairs of robust setae. Tarsus longer than tibia. ABDOMEN: ovoid, without long posterior extension, inter-scutal membrane rows of small sclerotized platelets absent posteriorly. Book lung covers elliptical, without setae, anterolateral edge unmodified, book lung covers medium-sized, darker than surrounding scutum. Anterior spiracles not discernible with a stereo microscope. Each posterior spiracle with a fine furrow that runs toward lateral margin of PES. Posterior spiracles connected by groove. Pedicel tube short, unmodified, scuto-pedicel region unmodified, scutum not extending far dorsal of pedicel, matted setae on anterior ventral abdomen in pedicel area absent, pEDICEL SCLERITES description: Ventral sclerite U-shaped, covering ventral and lateral sides of pedicel; ventral surface forming a crest-like elevation; crest bearing a row of transverse ridges. Dorsal scutum strongly sclerotized, without color pattern, covering full length of abdomen, no soft tissue visible from above, not fused to epigastric scutum, anterior half without projecting denticles, dS orange. Relatively few setae on DS, needle-shaped.. Epigastric scutum strongly sclerotized, surrounding pedicel, small lateral sclerites absent, eS orange. Posterior margin of ES procurved at middle. Postepigastric scutum strongly sclerotized, not fused to epigastric scutum, pES orange; considerably shorter than ES, leaving approximately 1/4 of abdomen length uncovered. Spinneret scutum present, incomplete ring, anal scutum present, lightly sclerotized. Spinneret scutum with fringe of needle-like setae. Interscutal membrane with setae. Abdomen setae spinneret scutum with fringe of about 13 needle-like setae. LEGS: femur IV not thickened, same size as femora I-III, patella plus tibia I shorter than carapace, tibia I unmodified, coxae coxae white, other segments yellow. On the anterior and posterior surface of each coxa a group of two-three smooth setae; smooth setae variable in length, consisting of smooth shaft and asymmetrical socket, projecting into the narrow space between adjacent legs, metatarsi metatarsi I-II with sceptre-like setae on both sides of lyriform organ; sceptre-like setae very short, with truncated apex, smooth except for distal ring of fine cuticular extensions; sceptre-like setae occurring either as a single, isolated seta or as a closely spaced pair, tarsi tarsi and metatarsi with shorter, densely barbed setae interspersed between the needle-like setae; these setae curved in lateral view, their sockets rounder than those of needle-like setae. Leg spines absent. Tarsi I to IV superior claws tooth not examined in detail. Trichobothria examined with Stereo microscope; tibia: each with three; metatarsus: each with one; each leg with four dorsal trichobothria: one on proximal tibia, two on distal tibia, one on distal metatarsus. GENITALIA: Ventral view: epigastric furrow situated in middle of abdomen. No external copulatory structures.
Melchisedec birni, female habitus, dorsal view (image by WF, specimen ID: ---34105)

MELCHBIRNIfphabd34105WF.tif

Melchisedec birni, female carapace, lateral view (image by WF, specimen ID: ---34105)

MELCHBIRNIfpcarl34105WF.tif

Melchisedec birni, female metatarsus II, lateral view (image by WF, specimen ID: ---34105)

MELCHBIRNIfsme2l34105WF.tif

 

DISTRIBUTION

NIGER
Melchisedec birni coordinates
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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 00034105  NIGER      near Birni-N'Konni  1 Adult Female  Holotype    13.79555; 5.25527  Leaf Litter  30 Oct 1976  unknown  RMNH 


 
 
 
 
The American Museum of Natural History, New York, in collaboration with
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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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