Archaias angulatus (Fichtel & Moll 1798)

Live individuals of the foraminiferans Archaias angulatus and one specimen of Coscinospira (=Peneroplis) antillarum from Belize

Archaias angulatus sensu Jones, R.W. 1994. The Challenger Foraminifera. Image source: Brady, H.B. (1884) Pl. 14

""Watermelon forams"--These foraminiferans possess chlorophyte (green algal) endosymbionts which give to the living cell a characteristic "grass green" coloration (specimen on right). Under high light (high UV?) conditions, the symbionts produce carotenoid pigments (salmon pink specimen on left)."

Image source: Cushman, J.A. 1930. The Foraminifera of the Atlantic Ocean. Part 7. Nonionidae, Camerinidae, Peneroplidae and Alveolinellidae. Bull. U.S. Natl. Mus. 104.

Close up of the pseudopores (pits) on the chamber surface of the foraminiferan Archaias angulatus from Belize, CA

Image source: Cushman, J.A. 1930. The Foraminifera of the Atlantic Ocean. Part 7. Nonionidae, Camerinidae, Peneroplidae and Alveolinellidae. Bull. U.S. Natl. Mus. 104.

Scanning electron micrograph of a shell of the foraminiferan Archaias angulatus from Belize