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Species Hastigerina aequilateralis Brady 1879


Discussion / Comments:
Bolli & Saunders (1985):
This species differs from the lectotype of H. siphonifera in the more open coiling mode, with the last or last few chambers often slightly detached from those of the earlier whorl. Because of this, the low trochospiral chamber arrangement of the initial chambers is usually readily recognizable. The plane in which the chambers of the low trochospiral early stage are arranged is often at an angle to that of the later chambers, resulting in a slightly streptospiral coiling mode.
Bolli (1957):
Scarce specimens of Hastigerina are found in the Lengua formation. They are slightly more involute than Brady's types and are therefore listed as H. cf. aequilateralis.
Systematics:

21
 Genus Hastigerina
  Species Hastigerina aequilateralis
Synonym list:
Bolli & Saunders (1985):
1884 Hastigerina aequilateralis Brady. - Brady : p.605 pl.80, figs 18a-b
1985 Hastigerina aequilateralis Brady. - Bolli & Saunders : 251, 252 figs. 42.6, 43.5-7, 9-10; 7,10,11
Bolli (1957):
1949 Globigerinella aequilateralis Brady. - Bermudez : p. 280 pl. 21, fig. 51
1957 Hastigerina cf. aequilateralis Brady. - Bolli : pl. 22, figs. 1a-2b
Was used in synonym list of:
Hastigerina siphonifera d'Orbigny 1839
References:

Brady,H.B. (1884):
Report on the foraminifera dredged by H.M.S. Challenger during the years 1873-1876.
In: Report of the scientific results of the voyage of H.M.S. Challenger, 1873-1876, Zoology Vol. 9 p. 1-814

Bermudez,P.J. (1949):
Tertiary smaller foraminifers of the Dominican Republic . Spec. Publ.Cushman Lab. Foraminiferal Res., Vol. 25 p. 1-322

Bolli,H.M. (1957):
Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I..
In: Studies in Foraminifery, Bulletin of the U.S. National Museum Vol. 215 Eds: Loeblich, A.R.Tappan, H.Beckmann, J.P.Bolli, H.M.Gallitelli, E.M.Troelsen, J.C. p. 97-123

Bolli,H.M. and Saunders,J.B. (1985):
Oligocene to Holocene low latitude planktic foraminifers.
In: Plankton Stratigraphy Eds: Bolli, H.M.Saunders, J.B. p. 155-262
Anonymous: Unedited TaxonConcept data
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