Remember that one of the defining features for spiders is that they have channels originating from a center pit/point. Then use the following guidelines to help you decide:
A spider without 'legs.' A central pit dominates, either without any branching channels associated or with very tiny ones. If channels are present, they will be short in comparison to the size of the central pit.
Flat-floored, circular-like depressions in relatively thin carbon dioxide ice layer on top of the permanent polar cap.
Keep in mind that more than one of the features (spiders, baby spiders, channel networks, swiss cheese, and craters) we ask you to identify can be visible in an image.
None of the features (spiders, baby spiders, channel networks, swiss cheese, and craters) are present
Although we're not explicitly looking for these types of terrains below, you might encounter them in the images you review. You can identify these and any other interesting features you find in Talk with a hashtag or you can start a collection.