Fossilized insect from 100 million years ago is oldest record
of primitive bee with pollen, Oregon State University, February 12, 2020
https://www.sciencedaily.com/releases/2020/02/200212164643.htm
Fossilized insect from 100 million years ago is oldest
record of primitive bee with pollen, Oregon State University
https://today.oregonstate.edu/news/fossilized-insect-100-million-years-ago-oldest-record-primitive-bee-pollen
The paper is:
Poinar Jr, G., 2020. Discoscapidae fam. nov. (Hymenoptera:
Apoidea), a new family of stem lineage