Catalog - Favusella

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Favusella

Type species: Globigerina washitensis Carsey

Type age (chronostrat): Albian to earliest Cenomanian

Test calcareous, microgranular hyaline, finely perforate with spherical to ovate chambers arranged in a low to moderately trochospiral coil; periphery rounded, lacking keel or imperforate periph cral band. Sutures depressed, radial, straight to slightly curved; umbilicus narrow to exceedingly wide. Primary aperture interiomarginal, umbilical to spiroumbilical with all possible intermediate positions; bordered above by a narrow lip in well preserved specimens. Test coarsely reticulated into regular polygonal areas by ridges forming a honey-comb pattern; each polygonal area with twenty or more minute pores.

Remarks: The most diagnostic feature of Favusella, n. genus, is its striking pattern of ornamentation composed of coarsely polygonal areas framed by ridges that lend a distinctive honeycomb pattern to the test (Plate 7, figs. 3-4).

Species of Favusella, n. genus, such as F. washitensis (Carsey) have often been assigned to Globigerina by various workers. Admittedly Favusella often displays an umbilically placed primary aperture and the cancellate ornamentation characteristic of Globigerina. However, Globigerina contains a single large pore situated in the center of a polygonal frame, whereas Favusella has nu merous minute pores distributed throughout the area of the entire polygonal frame. (See Plate 7, fig. 3-4).

Favusella includes species that are often similar to those of Hedbergella Bronnimann and Brown, but have cancellate ornamentation and an aperture that varies from umbilical to extraumbilical to spiroumbilical in position and lacks well developed portici. The umbilicus may vary from deep and narrow to moderately deep and wide. The absence of sutural supplementary aper tures separates Favusella from Ticinella Reichel.

Plummer (1931, p. 194) in redescribing Globigerina washitensis Carsey, was the first to notice the great diversity in chamber arrangement in this group of fossils. She stated". . . Almost any single sample yields tests that present a wide range of variation in arrange ment and number of chambers. Most tests show a rather high trochospire, and the larger the number of chambers in the whorl, the higher the spire. The domi nant diagnostic feature of this species that separates it from all other globigerine forms in the Texas section is the striking surface pattern." Occurrence: Favusella, n. genus, is usually found in neritic deposits, especially those laid down in the inner neritic depth zone. It has not been recorded in any bathyal or abyssal deposits. Within the Tethys and the Southern Boreal provinces, it has a wide geographic dis tribution. To date, it has never been reported from the Austral faunal province.

Journal part is dated 1972 but was published in 1973

References:

Michael, F. Y. (1973). Planktonic foraminifera from the Comanchean Series (Cretaceous) of Texas. Journal of Foraminiferal Research. 2 (1972)(4): 200-220. gs

			Favusella confusa Longoria and Gamper 1977 = Favusella washitensis
			Favusella hedbergellaeformis Longoria and Gamper 1977 = Favusella washitensis
			Favusella nitida Michael 1973 = Favusella washitensis
			Favusella orbiculata Michael 1973 = Favusella washitensis
			Favusella papagayosensis Longoria and Gamper 1977 = Favusella washitensis
			Favusella pessagnoi Michael 1973 = Favusella washitensis
not figured			Favusella planata Longoria and Gamper 1977 = Favusella washitensis
			Favusella quadrata Michael 1973 = Favusella washitensis
			Favusella scitula Michael 1973 = Favusella washitensis
			Favusella stiftia Rosler, Lutze and Pflaumann 1979 = Favusella washitensis
			Favusella voloshinae Longoria and Gamper 1977 = Favusella washitensis
			Favusella wenoensis Michael 1973 = Favusella washitensis

CATALOG OF ORIGINAL DESCRIPTIONS: Favusella Michael 1973

Favusella

References:

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