Foraminifera taxon details
Eoschubertella mexicana Thompson, 1948 †
910881 (urn:lsid:marinespecies.org:taxname:910881)
accepted
Species
marine, brackish, fresh, terrestrial
fossil only
Thompson, M. L. (1948). Studies of American fusulinids. <em>The University of Kansas Paleontological Contributions, Protozoa.</em> 1(4): 1-184., available online at http://hdl.handle.net/1808/3778
page(s): p. 79, Plate 28, figures 1-8 (holotype fig. 5). [details] Available for editors
[request]
page(s): p. 79, Plate 28, figures 1-8 (holotype fig. 5). [details] Available for editors
[request]
Original description Eoschubertella mexicana, n. sp., is one of the smallest of the schubertellids. The poles are pointed to broadly rounded....
Original description Eoschubertella mexicana, n. sp., is one of the smallest of the schubertellids. The poles are pointed to broadly rounded. The first volution of the holotype and of many paratypes is coiled at an angle of about 90 degrees to the plane of coiling of the outer volutions. Mature specimens of three to four and one-half volutions are 0.32 to 0.47 mm long and 0.24 to 0.43 mm wide. The form ratio is about 1.35. The average form ratios of the first to the fourth volution of two specimens are 1.12, 1.24, 1.35, and 1.37, respectively. The proloculus is minute. Its outside diameter is 34 to 57 microns, averaging 43 microns for four specimens. The average heights of the first to the fourth volution of four specimens are 23, 35, 47, and 59 microns, respectively. The heights of the chambers are about the same throughout the length of the shell, excepting in the extreme polar regions of specimens having pointed poles. The spirotheca is thin. It is composed of a tectum and upper and lower tectoria, and it is of about the same thickness throughout the length of the shell. The septa are thin and about normal to the spirotheca. The septal counts of the first to the fourth volution of two specimens are 8, 14, 15, and 19. The septa are unfluted throughout the length of the shell. The tunnel is relatively wide, and its path is irregular. The tunnel angles of the third and fourth volutions are about 23 and 34 degrees, respectively. The chomata are low and symmetrical. Their tunnel side is steep, and their poleward slope is low. The first volution of some specimens, including the holotype, has a short axis of coiling. In some, the form ratio of the first volution is less than unit value.
Remarks.—Eoschubertella mexicana resembles somewhat closely E. oliviformis (Thompson) from about 500 feet below the top of the Atoka formation of Oklahoma. However, the former species is much smaller in size, is more tightly coiled, has a smaller proloculus, is more highly asymmetrical in its early stages, and has thinner spirotheca.
(Thompson (1948)). [details]
Remarks.—Eoschubertella mexicana resembles somewhat closely E. oliviformis (Thompson) from about 500 feet below the top of the Atoka formation of Oklahoma. However, the former species is much smaller in size, is more tightly coiled, has a smaller proloculus, is more highly asymmetrical in its early stages, and has thinner spirotheca.
(Thompson (1948)). [details]
Hayward, B.W.; Le Coze, F.; Vachard, D.; Gross, O. (2021). World Foraminifera Database. Eoschubertella mexicana Thompson, 1948 †. Accessed at: http://www.marinespecies.org/foraminifera/aphia.php?p=taxdetails&id=910881 on 2026-06-30
Date
action
by
original description
Thompson, M. L. (1948). Studies of American fusulinids. <em>The University of Kansas Paleontological Contributions, Protozoa.</em> 1(4): 1-184., available online at http://hdl.handle.net/1808/3778
page(s): p. 79, Plate 28, figures 1-8 (holotype fig. 5). [details] Available for editors [request]
basis of record Ellis, B. F.; Messina, A. R. (1940-2015). Catalogue of Foraminifera. <em>Micropaleontology Press, American Museum of Natural History, New York.</em> [details]
page(s): p. 79, Plate 28, figures 1-8 (holotype fig. 5). [details] Available for editors
[request]basis of record Ellis, B. F.; Messina, A. R. (1940-2015). Catalogue of Foraminifera. <em>Micropaleontology Press, American Museum of Natural History, New York.</em> [details]
From editor or global species database
Original description Eoschubertella mexicana, n. sp., is one of the smallest of the schubertellids. The poles are pointed to broadly rounded. The first volution of the holotype and of many paratypes is coiled at an angle of about 90 degrees to the plane of coiling of the outer volutions. Mature specimens of three to four and one-half volutions are 0.32 to 0.47 mm long and 0.24 to 0.43 mm wide. The form ratio is about 1.35. The average form ratios of the first to the fourth volution of two specimens are 1.12, 1.24, 1.35, and 1.37, respectively. The proloculus is minute. Its outside diameter is 34 to 57 microns, averaging 43 microns for four specimens. The average heights of the first to the fourth volution of four specimens are 23, 35, 47, and 59 microns, respectively. The heights of the chambers are about the same throughout the length of the shell, excepting in the extreme polar regions of specimens having pointed poles. The spirotheca is thin. It is composed of a tectum and upper and lower tectoria, and it is of about the same thickness throughout the length of the shell. The septa are thin and about normal to the spirotheca. The septal counts of the first to the fourth volution of two specimens are 8, 14, 15, and 19. The septa are unfluted throughout the length of the shell. The tunnel is relatively wide, and its path is irregular. The tunnel angles of the third and fourth volutions are about 23 and 34 degrees, respectively. The chomata are low and symmetrical. Their tunnel side is steep, and their poleward slope is low. The first volution of some specimens, including the holotype, has a short axis of coiling. In some, the form ratio of the first volution is less than unit value. Remarks.—Eoschubertella mexicana resembles somewhat closely E. oliviformis (Thompson) from about 500 feet below the top of the Atoka formation of Oklahoma. However, the former species is much smaller in size, is more tightly coiled, has a smaller proloculus, is more highly asymmetrical in its early stages, and has thinner spirotheca.
(Thompson (1948)). [details]
From editor or global species database
