Abatomphalus pessagnoi ( Longoria 1973 )

Neagu, Theodor, 2016, Micropaleontological Study Of The Gura Beliei Red Marls Formation From The Pietroșița Area (Turonian - Maastrichtian). Part Iii Campanian-Maastrichtian Planktonic Foraminifera, Acta Palaeontologica Romaniae 12 (2), pp. 67-91 : 74-78

Abatomphalus pessagnoi ( Longoria 1973)

Figs. 8 : 22-27; Figs. 16 :1-17

1973 Globotruncana pessagnoi Longoria , p.97, pl.1, figs.1-9

Dimensions: D = 0,48- 0,34 mm; d = 0,40- 0,26 mm; g = 0,17- 0,14 mm

Remarks: Longoria (1973, p. 98) presenting his new species, showed that this one is similar to A. intermedius Bolli from which its differ in the less globular nature of the chambers (both spiral and umbilical). Also the shell is smooth without typical kind of ornamentation; keel as a finely beaded ( Fig.8 :23) or simple real keel ( Fig. 8 : 26).

Occurrences: Țâța Valley, Pietrosița- Fieni area Stratigraphic distribution: Upper Maastrichtian Specimens: LPB.IV.12434

Abatomphalus sp. cf. A.intermedius ( Bolli 1951)

Figs. 10 : 16-21; Figs. 11 : 1-15

Dimensions:

Morpha A: D = 0,39-0,50 mm; d = 0,31-0,48 mm; g = 0,09-0,14 mm

Morpha B: D = 0,40-0,65 mm; d= 0,34-0,58mm; g=0,7- 0,12 mm

Remarks: Specimens from the Upper Maastrichtian ( A. mayaroensis biozone) differs by shell's morphology from the Bolli's species A. intermedius by the following features: the shell is smooth without any kind of ornamentation; a peripheral double keel: one on the spiral side well developed and the second one on the umbilical side is slender.

From the phylogenetic point of view these specimens represent a stage between Globotruncanella (possible G. havanensis ) and A. mayaroensis . In the biozone with A. mayaroensis these morphotypes have a good frequency.

Occurrences: Țâța Valley, Pietrosița- Fieni area Stratigraphic distribution: Upper Maastichtian.

Specimens: LPB.IV. 12435

Figures

Fig. 8: 1-3 Globotruncanella coarctata (Bolli 1957), Maastrichtian, Țâța Valley, PietroȘița, L.P.B.IV.12437; 4-6 Globigerinella glaessneri (Gandolfi 1955), Maastrichtian, Țâța Valley, PietroȘița, LPB.IV.12418; 7-9 Archaeoglobigerina blowi Pessagno 1967, Maastrichtian, Țâța Valley, PietroȘița, LPB.IV.12449; 10-12 Rugotruncana subpenny (Gandolfi l955), Maastrichtian, Țâța Valley, PietroȘița, L.P.B.IV.12426; 13-18 Rugoglobigerina kelleri (Subbotina 1953), Maastrichtian, Țâța Valley, PietroȘița, LPB.IV.12451; 19-21 Rugotruncana tilevi Brönnimannn & Brown 1955, Maastrichtian, Țâța Valley, PietroȘița, LPB.IV.12436; 22-27 Abatomphalus pessagnoi (Longoria 1973), Maastrichtian, Țâța Valley, PietroȘița, LPB.IV.12434 (All specimens x 90).

Fig. 16: 1-17 Abatomphalus pessagnoi (Longoria 1973), Maastrichtian, Țâța Valley, PietroȘița, LPB.IV.12434; 18-20 Rugotruncana subbeldigi (Gandolfi 1955), Maastrichtian, Țâța Valley, PietroȘița, LPB.IV.12452; 21-26 Rugotruncana subloetterli (Gandolfi 1955), Maastrichtian, Țâța Valley, PietroȘița, LPB.IV.12423 (All specimens x 90).

Fig. 10: 1-15 Globotruncanella havanensis (Voorwjik 1937) emend. Brönnimann & Brown 1955, Maastrichtian, Țâța Valley, PietroȘița, LPB.IV.12429; 16-21 Abatomphalus sp.cf. A.intermedius, Maastrichtian, Țâța Valley, PietroȘița, LPB.IV.12434; 22- 27 Rugotruncana subglaessneri (Gandolfi 1955), Maastrichtian, Țâța Valley, PietroȘița, LPB. IV. 12421; 28-30 Rugotruncana subhexacamerata (Gandolfi 1955), Maastrichtian, Țâța Valley, PietroȘița, L.P.B. IV. 12422 (All specimens x 90).

Fig. 11: 1-15 Abatomphalus sp.cf. A.intermedius, Maastrichtian, Țâța Valley, PietroȘița, LPB. IV. 12434; 16-21 Reugotruncana ellissi Brönnimann & Brown 1955), Maastrichtian, Țâța Valley, PietroȘița, LPB.IV. 12426; 22-27 Gansseria gansseri (Bolli 1951), Maastrichtian, Țâța Valley, PietroȘița, LPB. IV. 12442 (All specimens x 90).