Genus Andrena is a group of ground-nesting bees, also known as mining bees or solitary bees. There are several synonyms that can be used to describe this insect group, including the genus Andrenapis, Andrena species, andrenine bees, and sand bees. These synonyms refer to the same group of insects, which are known for their unique nesting behavior and pollination role. While they may be small in size, these bees play a crucial role in our ecosystem by helping to pollinate plants and flowers, ensuring the continued growth and abundance of many important crops.