Catalog - Sphaeroidina bulloides dehiscens

CATALOG OF ORIGINAL DESCRIPTIONS: Sphaeroidina bulloides var. dehiscens Parker & Jones 1865

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 -> S -> Sphaeroidina -> Sphaeroidina bulloides dehiscens
Other pages this level: S. bulloides dehiscens, S. dehiscens immatura, S. gredalensis

Sphaeroidina bulloides dehiscens

Citation: Sphaeroidina bulloides var. dehiscens Parker & Jones 1865
Rank: variety
Type specimens: ZF. 3580 - Lectotype designated by Banner & Blow 1960
Type age (chronostrat): Recent
Type locality: Tropical Atlantic Ocean.
Type repository: London, UK; NHM

Linked specimens: London, UK; NHM (ZF.3580)

Current identification/main database link: Sphaeroidinella dehiscens (Parker & Jones, 1865)

Original Description

Description of lectotype: The large globose test shows only 3 chambers externally. The chambers are subspherical, much inflated, partially embracing, rapidly enlarging and appear to be trochospirally coiled. The test is involute both dorsally and ventrally. The sutures are broadly depressed and the periphery of the test is broadly lobulate. The apertures are sutural and multiple. The primary aperture appears to be interiomarginal, umbilical and ventral in position, but it, like the umbilicus, is infilled by extraneous The dorsal supplementary aperture is sutural in position but it is also infilled with extraneous material and consequently its true extent and nature cannot be ascertained in the lectotype. The apertures are furnished with thick flange-like lips of clear imperforate shell material; these flanges extend around the umbilical margins of the chambers and on both sides of the supplementary aperture. The sutures appear to be deeply incised in the vicinity of .the apertures and the flanges border these incisions throughout their length and in part bridge them. The wall of the test is apparently radial in structure and it is uniformly and coarsely perforate except for the flange-like areas. The surface of the test is smooth and highly polished especially in the vicinity of the apertures where the material of the flanges appears to spread thickly over the chamber surfaces. [Banner & Blow 1960]



Extra details from original publication


Taxonomic remarks: Parker and Jones (1865) based their original description on material collected from the "Tropical Atlantic Ocean."" A series of syntypic specimens, registered in the British Museum (Natural History) and contained in slide no., originated from 1080 fathoms, latitude 2 20' N., long. 28 44' W.; from amongst these, Dr. A. R. Loeblich selected a lectotype during his visit to Europe in the year 1953-1954. The lectotype was formally designated by Bolli, Loeblich and Tappan (1957, p. 33) and is deposited and registered in the British Museum (Natural History) as specimen number ZF. 3580. This lectotype is here illustrated and described for the first time (pl. 7, fig. 3).

The species Sphaeroidina dehiscens (1865) was designated by Cushman (1927) as the type species of the genus Sphaeroidinella Cushman 1927 and this is the type genus of the subfamily Sphaeroidinellinae Banner and Blow 1959. The genus Sphaeroidinella Cushman 1927 was restricted and emended by Banner and Blow 1959. [Banner & Blow 1960]

Remarks: In view of the fact that the lectotype is not well enough preserved to show all the morphological features associated with this species, it is necessary to refer to better preserved conspecific material. For this purpose reference is made to the specimens figured by Brady (1884) and by Bolli, Loeblich and Tappan (1957). The ""paratype"" (probably one of Parker and Jones' syntypes) which is now deposited in the U. S. National Museum (no. P. 4224a) and which was illustrated by Bolli, Loeblich and Tappan (op. cit., pl. 6, figs. 2a-b) shows the deeply incised nature of the sutures in the apertural regions. The other ""paratype,"" U.S.N.M. no. P. 4224b, (op. cit., loco cit., figs. 3a-b) possesses small abortive chambers which are common in this species but which may be seen, from their irregular and apparently haphazard development, to be distinct from bullae. The dissected hypotype, U.S.N.M. no. P. 4225a, (op. cit., loco cit., fig. 1) shows the intraumbilical position of the primary aperture of the penultimate chamber, the broadly arched shape of the dorsal supplementary aperture of the last chamber and the involute, tightly trochospiral coiling of this form. The coiling mode was also clearly illustrated by Brady (1884, pl. 84, fig. 11) in his sectioned specimen. This section also illustrates the characteristically thick and coarsely perforate walls of S. dehiscens, and it can be seen from his illustration that the walls are perforate beneath the apertural flanges. Our own investigations (Blow 1959, Banner and Blow 1959) show that this imperforate material, thickest in the apertural and sutural areas, extends over most at least of the remainder of the test surface as a superficially (probably secondary) cortex. This cortex seals or restricts the pores of the primary wall and gives the test its characteristically shiny appearance. Often the cortex is lost or partially lost in fossil specimens and it seems to be composed of less stable shell material than the earlier formed parts of the primary wall.

The genus, as now restricted, is monotypic and is believed to range from Sarmatian to Recent. [Banner & Blow 1960]


Editors' Notes


Banner, F. T. & Blow, W. H. (1960a). Some primary types of species belonging to the superfamily Globigerinaceae. Contributions from the Cushman Foundation for Foraminiferal Research. 11: 1-41. gs V O

Bolli, H. M., Loeblich, A. R. & Tappan, H. (1957). Planktonic foraminiferal families Hantkeninidae, Orbulinidae, Globorotaliidae and Globotruncanidae. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin . 215: 3-50. gs V O


Sphaeroidina bulloides dehiscens compiled by the pforams@mikrotax project team viewed: 27-11-2022

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