Gladicosa Pulchra Egg Sack.

If the sac is not fertilized, it simply won't happen. Has she been paired recently?

They're all WC so I'm not really sure .I still really don't know how all that works .

@animaliaadvocate216 If you caught her as a mature female, and she has not molted in your care, it might be fertilized.

If she has molted in your care, then it's not fertilized. (When they molt, they shed their spermathecae and any sperm stored in them.)

@Ungoliant none of the 4 lycos I have, have molted. I have 3 females. My Gladicosa Gulosa had a sack that went flat within a day and she ate it . The one that laid her sack last night was REALLY fat. The one this morning wasn't and if she wasn't doing a little dance over her water like the other one , I wouldn't have thought she was gravid. But I am still very new to this.