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Species Acarinina medizzai Toumarkine & Bolli 1975 | ||||||
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| Diagnosis / Definition: | ||||||
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Pearson et al. (2006): DESCRIPTION. Type ofwall: Finely muricate, normal perforate, nonspinose. Test morphology: Test relatively small, biconvex, quadrate to subcircular in outline, weakly to moderately lobate with a rounded periphery; chambers globular, 8- 12 arranged in a low trochospire of 3-4 whorls, increasing moderately in size, 4-6 in the final whorl, rarely kummerform; umbilicus narrow in more compact specimens, shallow and broad in more evolute forms; sutures moderately depressed, radial on both sides; aperture a small and often indistinct low umbilical to slightly extraumbilical arch. Size: Maximum diameter of holotype 0.19 mm; tests sizes range from 0.16 to 0.20 mm. |
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| Discussion / Comments: | ||||||
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Pearson et al. (2006): DISTINGUISHING FEATURES. Differs from A. collactea by its smaller size and smaller, often indistinct aperture; differs from A. echinata by absence of a bulla and by presence of an umbilicus; differs from Dipsidripella danvillensis (Howe and Wallace) in presence of a bilamellar, rather than monolamellar, wall and more densely muricate surface ornamentation. DISCUSSION.- This species is closely related to, and possibly synonymous with, Acarinina rugusoaculeata Subbotina. The latter was distinguished fiom A. medizzai by Toumarkine and Bolli (1975) on having a more umbilically positioned aperture and based on the presence of a final chamber that is larger and less detached from the previous chambers. Although Subbotina described her species as having a slit-like aperture that extends along the sutural margin, the apertural position in the holotype is not apparent fiom the illustration (e.g., Subbotina, 1953, pl. XXV: figs. 4a, b), and one of the other illustrated specimens that clearly does have an extraumbilical aperture and was designated as A. rugosoaculeata by Subbotina (1953, pl. XXV figs. 6a, b) lacks a muricate wall texture and therefore should not be included in Acarinina. This ambiguity cannot be cleared up from study of Subbotina's collection since the holotype and other specimens originally assigned to A. rugosoaculeata have been lost (E.M. Bugrova, pers. comm., 2003). Until specimens from the type level of the A. rugosoaculeata holotype can be studied and compared with A. medizzai we have chosen to suppress A. rugosoaculeata in favor of recognition of the better documented species A. medizzai. PHYLOGENETIC RELATIONSHIPS.- Probably descended from Acarinina collactea during middle Eocene Zone P 12 (=Zone E 1 0 of this paper). STRATIGRAPHIC RANGE.- Zone E10 to Zone E14. Toumarkine and Bolli (1 975) recorded the range of A. medizzai from the Globorotalia lehneri Zone to the base of the G. semiinvoluta Zone (upper middle to upper Eocene). Poag and Commeau (1995) noted that in the Hammond Core, southwestern Salisbury Embayment, Maryland coastal plain, "Zone P1 5" was recognized by the overlap of the lower range of Pseudohastigerina naguewichiensis and the occurrence of Globigerina (vel Acarinina) medizzai. However, in ODP Hole 1053A the highest occurrence of A. rnedizzai has been recorded in Sample 1053A-3H-4,105 cm, in Chron C1 6n.211, which is stratigraphically equivalent to Zone E 14 (Wade, 2004). Although Subbotina (1953) recorded muricate forms assigned to A. rugosoaculeata (e.g., Subbotina, 1953, pl. XXV: figs. 5a-c) in the (questionable) lower-middle Oligocene of the northern Caucasus region, no forms that are currently identified as A. medizzai (?=A. rugosoaculeata) have been recorded above Zone E14 elsewhere to our knowledge. GEOGRAPHIC DISTRIBUTION.- This species has a cosmopolitan distribution but is often unreported, perhaps because of its small size and/or incorrect identification. STABLE ISOTOPIC PALEOBIOL0GY.- No data available. |
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| Systematics: | ||||||
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35 Ordo Foraminiferida Superfamilia Globigerinaceae Familia Truncorotaloididae Genus Acarinina Species Acarinina medizzai |
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| Synonym list: | ||||||
| Pearson et al. (2006): p 1953 Acarinina rugosoaculeata Subbotina. - Subbotina : p. 312-313 pl. XXV, fig. 4a-c [upper Eocene, Don Basin,
northern Caucasus]; figs. 5a-c [lower-middle Oligocene?, Kholmsk district, northern Caucasus] [Not figs. 6a-c. upper
Eocene, Stalingrad region, Russia]
1975 Globigerina medizzai Toumarkine & Bolli. - Toumarkine & Bolli : p.77 pl. 6, fig. 1-8;
pl. 5, fig. 8, 10, 13-15, 17, 19-22 [upperEocene,
Scaglia Cinerea, Padua, Trevino, northern
Italy]
1985 Globigerina medizzai Toumarkine & Bolli. - Toumarkine & Luterbacher : p.150 fig. 41.1-6; 6, 8, 9 [upper Eocene, Scaglia Cinerea, Possagno
section, northern Italy]
1991 Acarinina medizzai Toumarkine & Bolli. - Nocchi et al. : p.266 pl. 4; fig. 23 [upper Eocene Zone P15,
ODP Hole 703A, South Atlantic Ocean]
1998 Acarinina medizzai Toumarkine & Bolli. - Spezzaferri : p.177 pl. 1; fig. 12a-b [middle Eocene, ODP Hole
918D, East Greenland Margin]
2004 Acarinina medizzai Toumarkine & Bolli. - Wade : p.29 pl. 2; fig. a, b, q [Zone P15, ODP Site 1052, western North Atlantic Ocean],
figs. c, d, n-p [Zone P14, ODP Site 1052,
western North Atlantic Ocean]
2006 Acarinina medizzai Toumarkine & Bolli. - Pearson et al. : p.295 pl. 9.14; fig. 1-15 (Pl. 9.13, Figs. 1-4: reillustration of holotype and
paratype of Globigerina medizzai Toumarkine and
Bolli)
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| Specimen: | ||||||
| National Museum of Natural History, Basel, Inventory number: C 24315 National Museum of Natural History, Basel, Inventory number: C 27327 National Museum of Natural History, Basel, Inventory number: C 27329 National Museum of Natural History, Basel, Inventory number: C 27328 |
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| References: | ||||||
Subbotina,N.N. (1953): Toumarkine,M. and Bolli,H.M. (1975): Toumarkine,M. and Luterbacher,H.P. (1985): Nocchi,M.; Amici,E. and Premoli Silva,I. (1991): Spezzaferri,S. (1998): Wade,B.S.. (2004): Pearson,P.N.; Olsson,R.K.; Hemleben,C.; Huber,B.T. and Berggren,W.A. (2006): |
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| Anonymous: Unedited TaxonConcept data | ||||||
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