CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina calida praecalida Blow 1969
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Citation: Globigerina calida praecalida Blow 1969Taxonomic rank: sub-speciesType specimens: PM P 49593Type age (chronostrat): Pliocene, Zone N. 19 (= Sphaeroidinella dehiscens dehiscens - Globoquadrina altispira altispira Partial-range zone). Ranges from about the upper middle part of Zone N. 17 (Upper Miocene) to Zone N. 23 (Pleistocene)Type locality: Holotype (figs. 7, 8) and figured paratype (fig. 3) from 100-102 cm. in deep-sea sediment core LSDH 78P, taken from a depth of 3208 meters, at lat. 4031 S. , long. 1680 02' E. , Pacific OceanType repository: London, UK; NHM
Original Description The moderate size test consist of about 9-10 chambers arranged in a very low trochospire with 4 chambers present in the last whorl. The chambers are inflated, not appressed, but well separated one from the other, and they do not embrace each other to any marked extent. The intercameral sutures are distinctly depressed, incised and are radial in direction both ventrally and dorsally. The umbilicus is moderately wide, open and deep. The aperture is essentially intraumbilical but shows slight asymmetry with respect to the umbilicus in the direction of the progression of the spire. The aperture is a moderately low arch with a narrow imperforate rimlike lip. The spire is low, depressed with the earlier whorls not protruding above the level of the dorsal surfaces of the later chambers. The wall is calcareous, radial hyaline, distinctly hispid and with fine pores not densely scattered over the surface of the chambers; the pores do not open into distinct pits. The hispidity is most marked on the earlier chambers and the spire bases give rise to a weakly mamelonated test surface. Size: Maximum diameter of holotype 0.35 mm. Extra details from original publication Globigerina calida praecalida differs from G. calicla calida in not possessing distinct radial elongation of any of the chambers and in having a less widely open umbilicus. The aperture does not show the same degree of approach to the extraumbilical condition as seen in G. calida calida. G. calida praecalida usually only possesses 4 chambers in the last whorl but 4 1 2 chambers may be present; the chambers of the last whorl are not so well separated as in G. calida calida and there is no clear approach to planispirality. G. calida praecalida, like G. calida calida, possesses a coiling mode which shows a rapidly opening spire with the later trochospire more lax in coiling than the earlier trochospire. These characters of the spire provide a ready distinction from G. praebulloides (s.l.). G calida praecalida also differs from G. praebulloidespraebulloides in possessing very globular chambers and more deeply incised dorsal and ventral intercameral sutures. Further, the wall of G. calida praecalida possesses fine pores which do not open into distinct pits, a feature which is in contradistinction to G praebulloides (s.l.).'
References:
Blow, W. H. (1969). Late middle Eocene to Recent planktonic foraminiferal biostratigraphy. In, Bronnimann, P. & Renz, H. H. (eds) Proceedings of the First International Conference on Planktonic Microfossils, Geneva, 1967. E J Brill, Leiden 380-381. gs
Globigerina calida praecalida compiled by the pforams@mikrotax project teamviewed: 9-2-2026
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Blow 1969 pl13 f07-8.JPG_P49593_Holo.JPG)
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Blow 1969 pl14 f03.JPG
Blow 1969 pl13 f07-8.JPG_P49593_Holo.JPG)
praecalida(G c)_P49593_Holo.JPG
Blow 1969 pl14 f03.JPG
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