CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia hirsuta eastropacia Boltovskoy 1974
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Citation: Globorotalia hirsuta eastropacia Boltovskoy 1974Taxonomic rank: sub-speciesType specimens: holotype (fig. 1a, b), no. FMACN 7468; and paratypes, no. FMACN 7469.Type age (chronostrat): RecentType locality: Holotype (fig. Ia, b) from a tow from a depth of 228 m. to the surface at Eastropac Expedition (1967-1968) Station 163 of R/V Undaunted, lat. 02°59' N., long. 92°001 W., eastern tropical Pacific; and also found, at depths between 230 and 0 m., at twenty-four other Eastropac Expedition stations in the eastern tropical Pacific, in the area limited by the 10°N and 7°S parallels and the 88°W and 125°W meridians. Three hundred fifty paratypes.Type repository: Buenos Aires: foraminiferal collection of the Museo Argentino de Ciencias Naturales "B. Rivadavia""; "
Original Description Test small or medium in size compared with other representatives of Globorotalia; coiled in a low trochospire; biconvex, the umbilical side considerably more inflated than the dorsal one, the latter being sometimes even flat; peripheral outline very lobulate; periphery rather sharply angled, without keel; chambers angular-rhomboid composed of 2.5 whorls in the adult, with 4-5 (rarely up to 5.5) chambers in the peripheral whorls; number of chambers in adult ranging from 13 to 16 in the entire test; sutures very distinct in last whorl, not so in the previous one, simple (not limbate), depressed, strongly curved on the spiral side and very slightly curved and deeply d epressed on the umbilical side ; aperture arched, interiomarginal, umbilical-extraumbilical, with a narrow rim or sometimes without it; wall smooth, relatively thin, finely perforate, slightly pustulate on the preapertural base, dorsal side without any ornamentation; coiling direction almost exclusively (97%) dextral. Size: Larger diameter 0.42-0.85 mm. (usually 0.55-0.65 mm.). Height 0.2-0.38 mm. Holotype (fig. 1a, b): Larger diameter 0.68 mm., height 0.34 mm. Figured paratypes, larger diameters, in mm.: Fig. 2, 0.60; 3, 0.60; 4,0.61; 5, 0.60; 6, 0.61; 7, 0.59; 10, 0.70; 11, 0.70. Etymology: after the Eastropac Expedition (1967-1968) Extra details from original publication Diagnosis and comparison. - The most important morphological features of this foraminifer are its lobulate outline, periphery without a keel, relatively thin walls which are smooth with the exception of a rather small preapertural area on the ventral side. This side is considerably more convex than the dorsal side. Globorotalia hirsuta eastropacia Boltovskoy differs from G. hirsuta hirsuta (nominate subspecies) in
a) being more convex ventrally than dorsally,
b) being slightly smaller,
c) being thin-walled,
d) being nonpustulate on the dorsal side and only very slightly pustulate on the ventral,
e) having a smaller number of chambers,
f) lacking a keel.
References:
Boltovskoy, E. (1974a). Globorotalia hirsuta eastropacia n. subsp. - planktonic subspecies (Foraminiferida) from the tropical Pacific Ocean. Revista Española de Micropaleontología. 6(1): 127-133. gs
Boltovskoy, E. (1974c). Late Pliocene and Quaternary paleoclimatic changes, Indian Ocean, DSDP, leg 26. Initial Reports of the Deep Sea Drilling Project. 26: 743-744. gs
Globorotalia hirsuta eastropacia compiled by the pforams@mikrotax project teamviewed: 13-9-2026
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Boltovskoy 1974 pl1f1.jpg
Boltovskoy 1974 pl1f1.jpg
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