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Subspecies Globorotalia (Globorotalia) crassula viola Blow 1969 | ||||||
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| Diagnosis / Definition: | ||||||
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Blow (1969): Description of holotype: Test large, coiled in a low trochospire with 12 chambers comprising the spire and with four chambers in the last whorl. The trochospire opens regularly and moderately slowly so that the chambers do not increase rapidly in size as added in the progression of the spire. The chambers in dorsal aspect are much longer tangentially (anterior posterior) than radial broad. The dorsal intercameral and spiral sutures strongly limbate; dorsal intercameral sutures, raised, recurved and slightly retorse peripherally. Dorsal side flat with little or no inflation of the dorsal sides of the chambers. Peripheral margin, sharply acute with a strongly developed carina. Ventral side of the test, obtusely conical, vaulted but forming a low cone. Ventral surfaces of the chambers slightly inflated and the ventral intercameral sutures distinctly but not deeply incised. Umbilicus, rather small but deep with clearly defined ventral umbilical shoulders to the chambers. Aperture, interiomarginal, umbilical extraumbilical, a low arch bordered by a thin and delicate lip. Wall calcareous, radial hyaline [62a], densely but finely perforate but without the pores opening into distinct pits. Wall pustulose over the area adjacent to the aperture on the ventral surfaces of the earlier chambers of the last whorl. Maximum diameter of holotype 0.54mm. |
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| Discussion / Comments: | ||||||
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Blow (1969): Remarks: G. (G.) crassula viola differs from G. (G.) crassula crassula in possessing a stronger carinal development and in possessing strongly limbate dorsal sutures as compared to the weakly limbate later dorsal intercameral sutures of crassula (s.s.). The earlier dorsal intercameral sutures of crassula (s.s.) appear to be non limbate and the later dorsal intercameral sutures are only weakly limbate. On the other hand viola shows strongly or moderately strongly developed limbation over all the visible dorsal intercameral sutures. G. (G.) crassula crassula is more tightly coiled with somewhat more embracing and more closely appressed chambers, as seen in dorsal aspect, than is the case for G. (G.) crassula viola. Associated with this greater laxity of coiling G. (G.) crassula viola possesses a greater degree of equatorial peripheral lobulation. G. (G.) crassula viola differs from G. (G.) crassula conomiozea in possessing an obtusely conical test compared to the more acutely conical test of conomiozea. Thus, the ventral side is not so sharply conical or so distinctly vaulted in viola as in conomiozea. Further, G. (G.) crassula conomiozea is more tightly coiled with more closely appressed chambers, as seen in dorsal aspect, than in G. (G.) crassula viola. The dorsal intercameral sutures of conomiozea are only weakly limbate or even non limbate at least in the earlier parts of the test. Reference should be made here to the comments given on P. 361 and P. 36o, above, for G. (G.) crassula crassula and G. (G.) crassula conomiozea, Check list nos. 173 and 172 respectively. The trivial name viola refers to the mitred, champered or "dove tailed" appearance of the dorsal aspect of the chambers which resernbles the petal arrangement in the flower Viola odorata (common wood violet). Stratigraphical Range: G. (G.) crassula viola ranges from within the earlier parts of Zone N.18 to Zone N.23. Holotype from sample WHB.18iB, "Buff Bay beds" Of CUSHMAN and JARVIS, non Buff Bay formation, HILL, 1899. Bowden formation, Jamaica; Zone N. 18. |
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| Blow (1969): 1969 Globorotalia (Globorotalia) crassula viola Blow. - Blow : p.397 pl. 5, figs. 4-9
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| Was used in synonym list of: | ||||||
| References: | ||||||
Blow,W.H. (1969): |
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| Anonymous: Unedited TaxonConcept data | ||||||
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