Geomonhystera australis
(Cobb, 1893) Andrássy, 1981
Photo Gallery- Costa Rica
Measurements
(12 females; all measurements in um).
  Mean SD Range CV
Body length 867 84.9 759-1036 9.80
Head width 15 1.9 13-20 12.54
Pharynx length 157 10.7 132-178 6.82
Vulva-anus 34 4.2 28-40 12.21
Tail length 115 14.3 100-138 12.39
Longer cephalic sensillae 8.2 0.8 7-9 9.17
Shorter cephalic sensillae 5.0 0.9 4-7 7.4
Fore end to amphid 17 2.7 14-23 15.53
Anterior end to amphid 3.4 0.4 3-4 0.50
Rectum 24 3.2 19-29 13.57
a 35 3.3 30-39 9.47
b 5.5 0.4 4.9-6.2 6.99
c 7.5 0.5 6.6-8.5 6.53
c' 5.9 0.5 5.2-6.8 7.81
V 83 1.3 80-85 1.56
vulva-anus: anal diameter 1.7 0.2 1.4-2.0 9.29
Tail: vulva-anus 3.4 0.3 2.9-4.1 9.21
Rectum: anal diameter 1.2 0.2 1.0-1.6 16.75
Anterior end-amphid: head width 1.1 0.1 0.9-1.4 11.87
Longer cephalic sensillae in % of head width 55 3.8 47-60 7.05
Description
Female:  Younger relaxed specimens arcuate ventrad, older more curved up to closed C shape.  Cuticle thin, unstriated.  Body setae short.  Outer labial sensilla articulate, directed anteriad.  Amphids rounded, usually 0.9 - 1.2 of head width at sensilla base from anterior body end, except for one female where 1.4 was measured.  Lips amalgamated, each with coniform papilla.  Stoma with three teeth on each pharyngeal sector.  Dorsal pharyngeal gland opens into stoma at the teeth level.  Pharyngo-intestinal valvae composed of three cells.  Most anterior intestinal cells hyaline, walls with distinct hyaline inner part.  Rectum usually 1.0-1.3 of anal diameter long, except for two females where 1.6 was measured. Anteriorly rectum never reaches vulva.  Vulva-anus distance usually 1.6-2.0 of anal body width, except for one female where 1.4 was observed.  Body tapers considerably immediately posterior to vulva.  Vagina anteriorly bent, no post vulval uterine sac nor spermatheca seen.  Tail tapers evenly, ends with rather elongated spinneret.  No terminal or subterminal setae observed.
The above description is based on specimens collected in Poland, Skierniewice, in loamy  sand soil of arable field.
G. australis is distinctive beacuse of very short body setae, relatively long vulva anus distance, anterior position of amphids and lack of terminal setae.
(Description- Brzseki, 1993)


 Specimens from Costa Rica
    Geomonhystera australis