An arrangement of three Doryphora boeckii from Quinnipiac (spelt Quininpiac on the slide) River, Connecticut. No name, but I think this is by JA Long. Olympus BHB microscope using 450nm LED light. I selected one of them (the right hand side one in the arrangement) for further imaging. 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 25 images stacked in Zerene (Pmax).
Accepted name: Cocconema boeckii Ehrenberg, 1838. Original description (of Cocconema boeckii Ehrenberg, 1838) Ehrenberg, C.G. (1835). Dritter Beitrag zur Erkenntnifs grofser Organisation in der Richtung des kleinsten Raumes. Abhandlungen der Königlichen Akademie der Wissenschaften zu Berlin, Physikalische Klasse, 1833: 145-336, pls. 1-11. page 241. Also known as Brebissonia boeckii. I can just about make out the striae and some of the structure in the apices on this one.