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OONOPIDAE SPECIES DESCRIPTION
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Trilacuna besucheti       Get publication



            Male (PBI_OON 15005). Total length 2.24. CEPHALOTHORAX: Carapace orange, without any pattern, pyriform in dorsal view, pars cephalica slightly elevated in lateral view, anteriorly narrowed to 0.49 times its maximum width or less, 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, rebordered, without denticles; plumose setae near posterior margin of pars thoracica absent; non-marginal pars cephalica setae dark, needle-like, present in u-shaped row; non-marginal pars thoracica setae absent; marginal setae absent. Clypeus sinuous in front view, vertical in lateral view, high, ALE separated from edge of carapace by their radius or more, median projection absent; setae absent. Chilum absent. Eyes six, well developed, all subequal, all eyes circular; 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, uniform, not fused to carapace, median concavity absent, with radial furrows between coxae I-II, II-III, III-IV, furrow wrinkled, radial furrow opposite coxae III absent, covered with small round pits, microsculpture only medially, 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 with indented extensions between coxae, without posterior hump, orange; setae sparse, dark, needle-like, evenly scattered, originating from surface, without hair tufts. Mouthparts: Chelicerae, endites and labium orange-brown. Chelicerae straight, anterior face unmodified; fangs without tooth-like projections, directed medially, shape normal, without prominent basal process, tip unmodified; setae dark, needle-like, evenly scattered, scarce on the anterior margin of paturon; paturon inner margin with pairs of enlarged setae, distal region abruptly narrowed. Labium triangular, not fused to sternum, anterior margin deeply incised, same as sternum in sclerotization; subdistal portion with unmodified setae. Endites distally excavated, serrula present in single row, posteromedian part unmodified, same as sternum in sclerotization. ABDOMEN: ovoid, 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, round, without setae, anterolateral edge unmodified. Posterior spiracles not connected by groove. Pedicel tube medium, ribbed, scuto-pedicel region unmodified, scutum extending far dorsal of pedicel, matted setae on anterior ventral abdomen in pedicel area absent, cuticular outgrowths near pedicel absent. Dorsal scutum strongly sclerotized, without color pattern, covering full length of abdomen, no soft tissue visible from above, not fused to epigastric scutum, middle surface smooth, sides smooth, anterior half without projecting denticles, orange. Epigastric scutum strongly sclerotized, not protruding, small lateral sclerites absent. Postepigastric scutum strongly sclerotized, long, semicircular, covering nearly full length of abdominal length, fused to epigastric scutum, orange. Spinneret scutum present, incomplete ring, very narrow. 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 needle-like setae. Dense patch of setae anterior to spinnerets absent. Interscutal membrane with setae. Colulus represented only by setae. 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, femora slightly darker. Leg spination (only surfaces bearing spines listed, all spines longer than segment width): (leg I: femora: pv0-0-1-0, Tibiae: v2-2-2-2-0,and an additional prolateral row ow many short macrosetae (Fig. qq), Metatarsi: v2-2-0, leg II: tibiae: v2-2-2-2-0, Metatarsi: v2-2-0. ). 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. Palp normal size, not strongly sclerotized, right and left palps symmetrical, proximal segments pale orange; embolus light, prolateral excavation absent, straight, accompanied by a paraembolic traslucent structure with branched tip and many filiform structures; 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; tibia trichobothria not examined; cymbium pale orange, ovoid in dorsal view, not fused with bulb, not extending beyond distal tip of bulb, with 2 stout setae on prolateral margin, the two stout setae are darkened and have enlarged bases.; bulb pale orange, 1 to 1.5 times as long as cymbium, slender, tapering apically, distal part with a circular distal foramen from where the embolus arises; on its prolateral border have a bunch of posteriorly directed, curved, setae-like structures..
Trilacuna besucheti, male palp, prolateral view (image by XG, specimen ID: ---15005)

trilabesucmdpalp15005XG.tif

Trilacuna besucheti, male abdomen, ventral view (image by XG, specimen ID: ---15005)

trilabesucmpabdv15005XG.tif

Trilacuna besucheti, male carapace, anterior view (image by XG, specimen ID: ---15005)

trilabesucmpcara15005XG.tif

Trilacuna besucheti, male carapace, dorsal view (image by XG, specimen ID: ---15005)

trilabesucmpcard15005XG.tif

Trilacuna besucheti, male carapace, lateral view (image by XG, specimen ID: ---15005)

trilabesucmpcarl15005XG.tif

Trilacuna besucheti, male carapace, ventral view (image by XG, specimen ID: ---15005)

trilabesucmpcarv15005XG.tif

Trilacuna besucheti, male habitus, dorsal view (image by XG, specimen ID: ---15005)

trilabesucmphabd15005XG.tif

Trilacuna besucheti, male habitus, lateral view (image by XG, specimen ID: ---15005)

trilabesucmphabl15005XG.tif

Trilacuna besucheti, male habitus, ventral view (image by XG, specimen ID: ---15005)

trilabesucmphabv15005XG.tif

Trilacuna besucheti, male palp, dorsal view (image by XG, specimen ID: ---15005)

trilabesucmppald15005XG.tif

Trilacuna besucheti, male palp, prolateral view (image by XG, specimen ID: ---15005)

trilabesucmppalp15005XG.tif

Trilacuna besucheti, male palp, retrolateral view (image by XG, specimen ID: ---15005)

trilabesucmppalr15005XG.tif

Trilacuna besucheti, male tibia I, prolateral view (image by XG, specimen ID: ---15005)

trilabesucmpti1p15005XG.tif


            Female (PBI_OON 15393). Total length 2.46. As in male except as noted. CEPHALOTHORAX: Carapace with a small slight reticulation on the anterolateral sides. Eyes PME touching for less than half their length. Sternum orange. Female palp claws absent; spines absent; tarsus unmodified. ABDOMEN: Dorsal scutum covering more than 3/4 of abdomen, orange, only very narrow lateral parts of soft tissues are visible from above.. Epigastric scutum surrounding pedicel, without lateral joints. Postepigastric scutum not fused to epigastric scutum, anterior margin unmodified, with short posteriorly directed lateral apodemes, orange. Spinneret scutum very narrow. LEGS: femora slightly darker. Leg spination (only surfaces bearing spines listed, all spines longer than segment width): (leg I: femora: pv0-0-1-0, Tibiae: v2-2-2-2-0, Metatarsi: v2-2-0, leg II: tibiae: v2-2-2-2-0, Metatarsi: v2-2-0. ). Trichobothria not examined. GENITALIA: Ventral view: posterior margin with a darkened band corresponding to the band of glandular tissue. Posterior receptacle small, rounded..
Trilacuna besucheti, female abdomen, ventral view (image by XG, specimen ID: ---15393)

trilabesucfpabdv15393XG.tif

Trilacuna besucheti, female carapace, anterior view (image by XG, specimen ID: ---15393)

trilabesucfpcara15393XG.tif

Trilacuna besucheti, female carapace, dorsal view (image by XG, specimen ID: ---15393)

trilabesucfpcard15393XG.tif

Trilacuna besucheti, female carapace, lateral view (image by XG, specimen ID: ---15393)

trilabesucfpcarl15393XG.tif

Trilacuna besucheti, female carapace, ventral view (image by XG, specimen ID: ---15393)

trilabesucfpcarv15393XG.tif

Trilacuna besucheti, female epigynum, epigynal area, ventral view (image by XG, specimen ID: ---15393)

trilabesucfpepiv15393XG.tif

Trilacuna besucheti, female habitus, dorsal view (image by XG, specimen ID: ---15393)

trilabesucfphabd15393XG.tif

Trilacuna besucheti, female habitus, lateral view (image by XG, specimen ID: ---15393)

trilabesucfphabl15393XG.tif

Trilacuna besucheti, female habitus, ventral view (image by XG, specimen ID: ---15393)

trilabesucfphabv15393XG.tif

Trilacuna besucheti, female internal female genitalia, dorsal view (image by XG, specimen ID: ---15393)

trilabesucfpifgd15393XG.jpg

Trilacuna besucheti, female internal female genitalia, dorsal view (image by XG, specimen ID: ---15393)

trilabesucfdifgd15393XG.tif

 

DISTRIBUTION

INDIA
Trilacuna besucheti 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 00015393  INDIA  Meghalaya    Khasi Hills: Mawphlang  3 Adult Female    1800  ;   Leaf Litter  28 Oct 1978  C. Besuchet, I. Löbl  MNVG 
PBI_OON 00015005  INDIA  Meghalaya    Garo-Hills: above Tura  1 Adult Male    700  25.56000; 89.49000  Leaf Litter  01 Nov 1978  C. Besuchet, I. Löbl  MNVG 
PBI_OON 00012742  INDIA  Meghalaya    Khasi Hills: 10 km north of Cherrapunjee  1 Adult Male    1700  ;   Leaf Litter  26 Oct 1978  Besuchet, C. and Löbl, I.  MNVG 


 
 
 
 
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