CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina cyclostoma Galloway & Wissler 1927
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Citation: Globigerina cyclostoma Galloway & Wissler 1927Rank: speciesType specimens: Plate 7, figs. 8, 9Type sample (& lithostrat): lower bed at the D. M. S. & B. Quarry; Lower San Pedro Fm. Type age (chronostrat): PleistoceneType locality: Lomita Quarry, Palos Verdes Hills, CaliforniaType repository: Columbia University Paleo. Coll. No. 19818
Original Description Test subglobular, composed of about seven or eight rapidly and regularly enlarging, closely appressed chambers, three of which compose the final volution, the last chamber being somewhat flattened on top and composing slightly less than one-half of the test; wall coarsely reticulate, the angles between having spines or knobs which almost obscure the pores; sutures depressed, inconspicuous; aperture a circular opening at the center of the inner margin of the last chamber, with a slight lip and with several small rounded secondary apertures between the chambers at the top of the spire. Size: Length of the type specimen, 0.39 mm.; width 0.35mm. Etymology: Extra details from original publication Occurrence. Rare in all three beds at the D. M. S. & B. Quarry. Not present in the Timms Point Pliocene material examined. Present in a few well samples from the Saugus and the Upper and Lower Pico of the Los Angeles Basin. This species differs from G. rubra d'Orbigny (in De la Sagra, Hist. Ph Nat. Cuba, 1839, Foraminiferes, p. 94, pl. 4, figs. 12-14), by its much more compact method of coiling, its less globular chambers, its more regularly formed trochoid coil and its small, circular aperture. Figure 9 shows a specimen from the middle bed in which the secondary apertures are obscure. Editors' Notes
References:
Galloway, J. J. & Wissler, S. G. (1927). Pleistocene foraminifera from the Lomita Quarry, Palos Verdes Hills, California. Journal of Paleontology. 1(1): 35-87. gsVO
Globigerina cyclostoma compiled by the pforams@mikrotax project teamviewed: 30-1-2023
Galloway Wissler 1927 pl7 f8.JPG
Galloway Wissler 1927 pl7 f9.JPG
Galloway Wissler 1927 pl7 f8.JPG
Galloway Wissler 1927 pl7 f9.JPG
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