CATALOG OF ORIGINAL DESCRIPTIONS: Hedbergella pseudotrocoidea Michael 1973

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 -> H -> Hedbergella -> Hedbergella pseudotrocoidea
Other pages this level: << < H. holmdelensis, H. implicata, H. intermedia, H. kuhryi, H. kyphoma, H. labocaensis, H. lata, H. libyca, H. luterbacheri, H. maslakovae, H. murphyi, H. occulta, H. praelibyca, H. praelippa, H. praetrocoidea, H. pseudotrocoidea, H. punctata, H. quadrata, H. rischi, H. semielongata, H. sigali, H. similis, H. sliteri, H. telatynensis, H. trocoidea yezoana, H. wondersi

Hedbergella pseudotrocoidea

Citation: Hedbergella pseudotrocoidea Michael 1973
Rank: Species
Type locality: Road cut on Taxco Street at the northeast junction of I.S. 20 and U.S. 80, off the Ridgmar exit on the southwest edge of Westover Hills, Fort Worth, Tarrant County, north-central, TX
Type age (chronostrat): Upper Albian
Type sample (& lithostrat): sample DC 7 ; Duck Creek Formation
Type specimens: Plate 3, figs. 4-8; Holotype: USNM 172789; Paratype USNM 172790; Paratype: F.M. 5, Pessagno Collection, Univcrsity of Texas at Dallas.
Type repository: Washington; USNM

Linked specimens: USNM-172789 USNM-172790

Current identification/main database link: Microhedbergella pseudotrocoidea (Michael 1973)

Original Description
Test small to medium, a low trochospiral of about 2.5 volutions; last whorl with 7-8 subglobular chambers increasing gradually in size; last chamber exceptionally large and protruding into a relatively wide umbilicus; periphery broadly rounded, lobulate; sutures radial, straight and depressed; primary aperture interiomarginal, extraumbilical-umbilical; a fragile narrow lip rarely preserved.

Extra details from original publication
Remarks: This species is closely related to H. trocoidea (Gandolfi). It differs from the latter species by the gradual increase in the size of chambers in the last whorl, in the extremely large last chamber, which protrudes into the umbilicus, and in the lobulate periph­ eral outline. H. trocoidea as redescribed by Caron and Luterbacher (1969, p. 23, pI. 7, figs. 1-2) from Gandolfi's collection is relatively convex on the spiral side; the chambers are more globular; and the last chamber is not as large and does not protrude into the umbilicus.
Range: Upper Albian. H. implicata Subzone and H. punctata Subzone of the Favusella washitensis Assemblage Zone.
Occurrence: H. pseudotrocoidea, n. sp., is abundant in the Duck Creek Formation and is common throughout the Fort Worth and Denton Formations. This species is rare in the upper parts of the Kiamichi Formation. The absence of this spccies from formations higher than the Denton Formation indicates an age no younger than Albian. It is probable that both H. trocoidea and H. pseudotrocoidea are restricted to the Albian Stage, as this was indicated by Caron and Luterbacher (1969) for H. trocoidea.


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


Hedbergella pseudotrocoidea compiled by the pforams@mikrotax project team viewed: 28-10-2020

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Comments (1)

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Le Coze

1973 not 1972

Jeremy Young (UK)

now corrected, thanks

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