JimC wrote: 2. Foraminifera are a favorite! My dad wrote many scientific papers on their classification. Here are some of the illustrations he did (unfortunately a photo of an old, yellowed copy, but it's all I have...)
Forams are pretty awesome. Some of them have symbiotic photosynthetic dinoflagellates (single-celled brown-algae relatives) living inside them, and their shells have thin places acting as 'windows' for those little dinos... that's just so cute and adorable!
And then there's some massive foram relatives that grow up to 20-30cm in diameter, consisting of a SINGLE multinucleate cell! Meet Xenophyophora:
