A. Roberts drawing of erraticum shows a distinct ventral projection at the tip of the tarsus, which this specimen doesn't appear to show.
B. The drawing for virescens shows a tear-dropped shape at the end of the bulb, which this specimen shows and which appears to be absent from the drawing of erraticum.
C. Roberts drawings show a smooth curve for the proximal spur projection of erraticum but a less smooth curve for virescens, as per this specimen.
D. There is a slight fork at the apex of the projection at D, better fitting virescens.
E. Although the hairs at E are rather tangled and stuck together they appear robust, again better fitting virescens.
F. The longest hairs at F appear longer than the width of the patella, favouring virescens?
Hope this helps.
I will take another look there when i get a moment and see if i can find one.
If you revisit the site and can collect an adult spider and send to me (alive) in a small plastic container with a little dampened tissue inside (cave spiders need humid conditions) inside a padded envelope I can determine which species. Peter Harvey, 32 Lodge Lane, Grays, Essex RM16 2YP (National Organiser, Spider Recording Scheme).
I wouldn't be surprised if i get no ID agreements/other suggestions or comments for my post here:
So i wondered if anyone here would mind giving their thoughts on this beautiful spider please?
Also, if this is indeed Meta, (and in case i see this spider again), how are the 2 similar species separated in the field? I normally carry a hand lens.
I can supply a 10 fig grid ref for this observation if requested. All the other details that i have or know of the sighting are included in the above post (should you want take this as a record).
I see there aren't many records for either species but can easily revisit this site for another look/better photos sometime, as it's not far from me.
Ben Area Co-ordinator Stroud and Gloucester, Gloucestershire Amphibian and Reptile Group (Glos ARG) Member, Cotswold Fungus Group and Field Ecologist
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