User:Abyssal/Prehistory of North America/DYK/18

... that the stems in the pseudo-trunk of the extinct fern Tempskya decayed as the plant matured, leaving a layer of adventitious roots behind?
... that the Paleocene Alaskan maple Acer alaskense was described from a fossil leaf that may be atypical for the species?
... that of the three described species in the Eocene bulldog ant genus Avitomyrmex, one species is known only from worker caste individuals?
... that paleoecologist Heinz Lowenstam discovered that living organisms can produce magnetite within their bodies?
... that the Maya archaeological site of Tres Islas in Guatemala has an alignment of monuments that imitates an architectural group at Uaxactun that served as an astronomical observatory?

... that Arthropleuridea is an extinct class of myriapods which includes, at over 2 meters long, the largest terrestrial arthropods that ever lived?
... that the extinct fern Wessiea is known from Miocene fossils found at the "Ho ho" locality in Yakima County, Washington?
... that the extinct species Cornus piggae has fruits smaller than any other species in the dogwood subgenus of Cornus?
... that Obamadon was an extinct lizard that was named after President Barack Obama as a tribute to his "role model of good oral hygiene for the world"?
... that the extinct Actinidia oregonensis was the first kiwi relative described from North America?