Which spider type is noted for having spiky details on its egg sacs?

The Brown Widow Spider is recognized for its distinctive egg sacs, which are often described as having spiky projections, giving them a notably different appearance compared to the egg sacs of other spider species. This characteristic helps in identifying the Brown Widow Spider, as the spiky edges provide a visual cue that can assist both entomologists and the general public in recognizing this spider and differentiating it from others.

In contrast, Black Widow and Brown Recluse Spiders have smoother egg sacs without these spiky details, making them less visually distinctive in this aspect. House Spiders, while common, do not exhibit the specific spiky features on their egg sacs that would align with those of the Brown Widow. This unique characteristic of the Brown Widow's egg sacs is significant in understanding spider identification and behavior.