Catalog - Planomalina pulchella Catalog - Planomalina pulchella

CATALOG OF ORIGINAL DESCRIPTIONS: Planomalina pulchella Todd&Low 1964

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 -> P -> Planomalina -> Planomalina pulchella
Other pages this level: P. alvarezi, P. apsidostroba, P. blowi, P. caseyi, P. ehrenbergi, P. maridalensis, P. mauryae, P. mendezensis, P. praebuxtorfi, P. pulchella, P. rowei, P. saundersi, P. yaucoensis

Planomalina pulchella

Citation: Planomalina pulchella Todd&Low 1964
taxonomic rank: Species
Described on page(s) : 401
Type specimens: 641522; Plate 1, Fig. 9
Type age (chronostrat): Cenomanian
Type locality: A dredge haul taken at a depth between 3200 and 3500 fathoms at lat. 20 degrees 17 N., long. 65 degrees 42 W., on the north slope of the Puerto Rico Trench.
Type repository: Washington; USNM

Linked specimens: USNM-641522

Current identification/main database link: Planomalina pulchella Todd and Low, 1964


Original Description

Test planispiral, more elongate than circular in equatorial outline, biumbilicate, involute, lobulate periphery angular in early part gradually becoming subangular to subrounded in final chambers, peripheral angle ornamented by coarse rugose knobs over early part, rugosity diminishing over later part; early chambers small and indistinct, angular-rhomboid increasing in size and globularity as added, 7-8 in final whorl; sutures indistinct, curved, raised and nodular in early part, becoming less ornamented between middle chambers, slightly depressed, more distinct and almost straight between final chambers; wall heavily rugose in early part becoming quite smooth on final 2-3 chambers; aperture indistinct, beneath rounded arched lip at base of final chamber, outline of lip extending to umbilicus on both sides, lips of former apertures circling the umbilical area.

Extra details from original publication
The early part of the test has strong affinities with Planomalina buxtorfi (Gandolfi) : sutures are well curved and raised with rugose ornamentation; the angular periphery is also heavily rugose and the early chambers somewhat obscured by the ornamentation. The later part, however, looks more like species of Globigerinelloides: chambers become more globular as they increase in size with little or no angularity in the final chamber; the sutures are slightly depressed and straightened; the wall is smooth; the apertural lip is a rounded arch with no subtriangular peak as in Planomalina buxtorfi.

The specimens closely resemble the types of Biglobigerinella barri BOLLI, LOEBLICH,and TAPPAN, (1957, p. 25, pl. I, figs. 13-18). However, the early chambers of B. barri are rounded with depressed sutures, and there is little increase in size and inflation as chambers are added. The present species is more elongate than circular, and there is no indication in any of our specimens that a biforaminate stage has been attained.

References:

Todd, R. & Low, D. (1964). Cenomanian (Cretaceous) Foraminifera from the Puerto Rico Trench. Deep-Sea Research. 11: 395-414. gs


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Planomalina pulchella compiled by the pforams@mikrotax project team viewed: 21-7-2024

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