CATALOG OF ORIGINAL DESCRIPTIONS: Morozovella bandyi Fleisher 1974

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> M -> Morozovella -> Morozovella bandyi
Other pages this level: M. allisonensis, M. bandyi, M. protocarina, M. rajasthanensis, M. tarabulusi

Morozovella bandyi

Citation: Morozovella bandyi Fleisher 1974
Rank: species
Type locality: DSDP Site 219, Arabian Sea
Type age (chronostrat): zone P11 (Globigerinatheka subconglobata subconglobata Zone of Bolli, 1971 = Globigerapsis kugleri Zone of Bolli, 1966).
Type sample (& lithostrat): DSDP 219, Core 19, Section 6, 51-53 cm
Type specimens: The holotype is illustrated on Plate 14, Figures 3, 4, 5,

Linked specimens: USNM-211466 USNM-211469 USNM-211468 USNM-211467

Current identification/main database link: Morozovelloides bandyi (Fleisher 1974)


Original Description

The lenticular test is small for species of this genus, with the chambers arranged in a low trochospire. Four to five chambers are present in the final whorl; the early chambers are obscured. The chamber walls are penetrated by numerous relatively small pores with weakly developed pore pits, but no reticulate network of interpore ridges is developed. Blunt pseudospines are well developed along the angular periphery, along the distal portions of the dorsal intercameral sutures, on the umbilical shoulders, and over the ventral surfaces of the early chambers in the final whorl. The dorsal side is slightly convex, but consists of two distinct regions: a broad, raised projection formed by the early chambers, and a relatively flat surface created by the dorsal walls of the chambers of the last-formed whorl. Dorsal sutures are curved and slightly depressed where not obscured by pseudospines. The anterior portion of each chamber is imbricate over the posterior margin of the following chamber. Small but distinct accessory apertures are consistently present along the spiral suture at the inner margin of the final one or two chambers. These take the form of small arcuate openings bordered by a distinct imperforate rim (Plate 14, Figure 7). The periphery is weakly to strongly lobate, with lobations more pronounced in larger specimens, and subacute to acute. A distinct peripheral carina is present, formed from coalesced pseudospines. Elevation of the ventral side is relatively low. Ventral sutures are depressed, and the wedge-shaped chambers (in ventral view), although closely appressed, are distinct. The umbilical shoulders appear roughened because of the development of pseudospines. The umbilicus is relatively wide, deep, and distinct. The aperture is a moderately open arch, extraumbilical in position, at the base of the apertural face.


Size: Dimensions.- Holotype (figs. 3-5): Maximum diameter 0.35 mm. Paratypes, maximum diameters: Figs 6, 7, 0.30 mm.; fig. 9, 0.49 mm.

Etymology: This species is named for the late Dr. Orville L. Bandy, until his recent death Professor of Geological Sciences, University of Southern California.

Extra details from original publication
Remarks: van Heerden (1970) considered his specimens, which are identical with M. bandyi, to represent forms of G. spinulosa Cushman possessing dorsal apertures. The imperforate rim around each secondary aperture, however, suggests that these openings are not accidental features, but instead represent well-defined structural elements of the test. Specimens of M. bandyi, furthermore, were compared with Cushman's holotype by Dr. O. L. Bandy. M. bandyi differs from Globorotalia spinulosa not merely in having accessory apertures, which were present in all specimens observed, but in possessing a distinct and open umbilicus. The accessory apertures and dorsal inflation of the early chambers serve to separate this form from other species of Morozovella.
Van Heerden concluded, from his specimens, that accessory apertures in Paleogene forms are of no taxonomic value, and proposed the rejection of Truncorotaloides. In this case, the morphology of M. bandyi suggests that, whatever the significance of dorsal apertures may be in the Acarinina-Truncorotaloides species complex, its affinities are entirely with other species of Morozovella and with M. spinulosa (Cushman) in particular.

References:

Fleisher, R. L. (1974a). Cenozoic planktonic foraminifera and biostratigraphy, Arabian Sea, Deep Sea Drilling Project, Leg 23A. Initial Reports of the Deep Sea Drilling Project. 23: 1001-1072. gs V O

Pearson, P. N. & Berggren, W. A. (2006). Taxonomy, biostratigraphy, and phylogeny of Morozovelloides n. gen. In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 41(Chap 10): 327-342. gs V O


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Morozovella bandyi compiled by the pforams@mikrotax project team viewed: 23-4-2021

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