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Species Globorotaloides falconarae Giannelli & Salvatorini 1976 | ||||||
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| Discussion / Comments: | ||||||
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Iaccarino (1985): This species is not well known in the literature and therefore a description of the type is given here. Small size (maximum diameter 0.25 mm), low trochospire with 12 chambers arranged in 21, whorls and with 4 chambers in the last whorl; weakly lobate equatorial periphery, ovate chambers ventrally slightly compressed, gradually increasing; slightly depressed sutures both ventrally and dorsally; low arched aperture extending from the umbilicus towards the peripheral margin and bordered by a protruding imperforate lip; cancellate surface and finely perforate wall; fairly wide umbilicus. The variations described by Bolli (1957) for the genus Globorotaloides are recognizable in the different growth stages of this species. In the early stage the aperture is an umbilical extraumbilical slit, the umbilicus is small, the test is more compressed and the chambers are tangentially elongated. In any growth stage specimens with an anomalous last chamber are common. This chamber is characterized by a more delicate structure, a smaller size than the previous one and an extension towards the umbilical area, completely or partially covering it. In small specimens it is bulla like and, very unusually, has two infira laminar apertures. G.falconarae shows strong similarities with G. suteri, which differs by possessing a more lobate periphery, more spherical chambers, and greater size (maximum diameter 0.35 mm). Close relation ships with G. suteri are seen also in the different ontogenic stages. Therefore it is suggested that G. falconarae may be the direct descendant of G. suteri. Specimens closely related to G. falconarae are recorded below its range as given by Giannelli & Salvatorini. The species is known from the Late Miocene of the Mediterranean area and more recently has also been recognized from the same stratigraphic interval in the Atlantic (Iaccarino & Salvatorini, 1979; Salvatorini & Cita, 1979). |
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| Iaccarino (1985): 1976 Globorotaloides falconarae Giannelli & Salvatorini. - Giannelli & Salvatorini : p.170 pl. 2
1985 Globorotaloides falconarae Giannelli & Salvatorini. - Iaccarino : p.301 figs. 5.8a-c; 4
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| References: | ||||||
Giannelli,L.. and Salvatorini,G. (1976): Iaccarino,S. (1985): |
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| Anonymous: Unedited TaxonConcept data | ||||||
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Taxon relations
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