pforams@mikrotax - Chiloguembelina adriatica

pforams@mikrotax - Chiloguembelina adriatica pforams@mikrotax - Chiloguembelina adriatica

Chiloguembelina adriatica

Classification: pf_cenozoic -> Guembelitrioidea -> Chiloguembelinidae -> Chiloguembelina -> Chiloguembelina adriatica
Sister taxa: C. adriatica, C. cubensis, C. andreae, C. ototara ⟩⟨ C. parallela, C. trinitatensis, C. wilcoxensis, C. crinita ⟩⟨ C. subtriangularis, C. midwayensis, C. morsei, C. sp.

Olig Atlas pl17-01 10-12.JPG
Olig Atlas pl17-01 17.JPG
Olig Atlas pl17-01 19 23.JPG
Olig Atlas pl17-01 13-16.JPG
Olig Atlas pl17-01 18.JPG

Taxonomy

Citation: Chiloguembelina adriatica Premec Fucek, Hernitz Kucenjak, and Huber, in Premec Fucek et al. 2018

Rank: species

Synonyms:

Chiloguembelina cubensis (Palmer).—Beckmann, 1957:89, text-fig. 14 (7, 8) [lower Oligocene, Cipero Fm., San Fernando, Trinidad].—Hornibrook, 1990:368, pl. 1, fig. 1 [lower Oligocene, Cuba].—Spezzaferri and Premoli Silva, 1991:237, pl. 10, fig. 5a [lower Oligocene Subzone P21a, ODP Hole 538A, Gulf of Mexico].—Leckie and others, 1993:123, pl. 1, fig. 14 [lower Oligocene Subzone P21a, ODP Hole 803D, Ontong Java Plateau, western Pacific Ocean].—Hernitz Kucenjak and others, 2006:24, pl. 4, figs. 11, 12 [lower Oligocene Zone O4, Jihar-5 well, sample 190-200 m, Palmyride region, Syria]. [Not Palmer, 1934.]

Taxonomic discussion:

The exceptionally well-preserved material from the Adriatic Sea and Syria enabled detailed study of the abundant biserial planktonic foraminifera. Two morphologically significant groups with costate surface ornamentation that clearly differ in shape have been observed. The first of these is the commonly identified species C. cubensis. The other group differs from C. cubensis by the growth rate of chambers, total number of chambers, apical angle and length and width of the test. The specimens with a more rapidly flaring test outline are placed in Chiloguembelina adriatica. This species appears in the uppermost Eocene Zone E16 and disappears at the end of Zone O4, with sporadic occurrences in Zone O5. In contrast, Chiloguembelina cubensis has a longer stratigraphic range with its lowest occurrence (LO) in the middle Eocene and highest common occurrence (HCO) at the top of Zone O4, above which it becomes rare and sporadic up to the uppermost Oligocene. [Premec Fucek et al. 2018]

Catalog entries: Chiloguembelina adriatica

Type images:

holotype: C. adriatica
paratype: C. adriatica

Distinguishing features:
Parent taxon (Chiloguembelina): Test subtriangular in outline, biserial throughout or rarely with multiserial final chambers; aperture a simple arched opening at base of the final chamber, with a narrow rim on one margin and a broad collar or flange directed toward one of the flat sides of the test, lacking an infolded margin or internal plate. Rarely with multiple apertures.
This taxon: Like C. cubensis but test outline more rapidly flaring, greater apical angle of about 55-60°, a more rapid increase in chamber size and generally a shorter and wider test.

NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
They are being edited as the site is developed and comments on them are especially welcome.

Description

Morphology:

Test biserial, elongate, subtriangular in outline, periphery rounded; chambers increasing moderately to rapidly in size, usually 11-12, up to 14 in adult specimens; sutures depressed, perpendicular to slightly oblique to the growth axis; aperture a low, moderately narrow to broad, symmetrical arch centered or slightly off-center from the base of the final chamber, bordered on one side by a narrow collar that thickens away from its attachment point on the chamber face. Apical angle is larger than in C. cubensis, generally about 55-60°. [Premec Fucek et al. 2018]

Wall type:

Olig Atlas pl17-01 20-22.JPG
Olig Atlas pl17-01 07-9.JPG

Microperforate, bilamellar, the wall is 4-5 μm thick, the inner layer is usually very thin (0.4-0.5 μm), the outer layer has a submicron granular (blocky) texture (Pl. 17.1, Fig. 21), ototara-type wall (see Chapter 15, this volume); surface ornamentation consists of fine but distinct, discontinuous costae on the youngest chambers, becoming faint on last chambers, with costae aligned with the long axis of the test; the wall is evenly perforated by pores that are usually about 0.50-0.75 μm in diameter, but can exceed 1 μm as a result of dissolution, pore channels are straight. [Premec Fucek et al. 2018]

Size:

Size of measured populations: Mid-latitude (Adriatic Sea): Length 0.10-0.19 mm; width 0.07-0.13 mm; breadth 0.06-0.07 mm. Low latitude (Syria): Length 0.14-0.22 mm; width 0.09-014 mm; breadth 0.07-0.08 mm. [Premec Fucek et al. 2018]

Character matrix
test outline: Triangular chamber arrangement: Biserial edge view: Equally biconvex aperture: Interiomarginal
sp chamber shape: Globular coiling axis: N/A periphery: N/A aperture border: Thin lip
umb chbr shape: Globular umbilicus: N/A periph margin shape: Broadly rounded accessory apertures: None
spiral sutures: Moderately depressed umb depth: N/A wall texture: Finely costate shell porosity: Microperforate: <1µm
umbilical or test sutures: Moderately depressed final-whorl chambers: 2-2 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution

Cosmopolitan. Beckmann (1957:89, text-fig. 14:7, 8) was the first to illustrate biserial morphotypes with a costate surface based on two morphotypes from lower Oligocene sediments (Cipero Formation) in Trinidad. Morphotypes with a shorter and wider test and greater apical angle most probably belong to the herein described species C. adriatica n. sp. Hornibrook (1990:368, pl. 1, fig. 1) also figured costate specimens from the lower Oligocene of Cuba, and Leckie and others (1993; pl. 1, fig. 14) provided SEM images of the same morphotype from lower Oligocene of the Ontong Java Plateau. In the Adriatic Sea and Syria this form is very common in Zone O1 and O2 and comprises up to 30% of the biserial planktonic populations in the small size fractions (63-125 μm). [Premec Fucek et al. 2018]

Isotope paleobiology

No data available. [Premec Fucek et al. 2018]

Phylogenetic relations

Probably evolved from C. cubensis during the latest Eocene. [Premec Fucek et al. 2018]

Most likely ancestor: Chiloguembelina cubensis - at confidence level 2 (out of 5). Data source: Premec Fucek et al. 2018.

Biostratigraphic distribution

Geological Range:
Notes: Uppermost Eocene (Zone E16) to the end of Zone O4, with sporadic occurrences in Zone O5 (this study). [Premec Fucek et al. 2018] [Premec Fucek et al. 2018]
Last occurrence (top): within O5 zone (26.93-28.09Ma, top in Chattian stage). Data source: Premec Fucek et al. 2018
First occurrence (base): within E16 zone (33.9-34.68Ma, base in Priabonian stage). Data source: Premec Fucek et al. 2018

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Chiloguembelina

Primary source for this page: Premec Fucek et al. 2018 - Olig Atlas chap.17 p.463

References:

Beckmann, J. P. (1957). Chiloguembelina Loeblich and Tappan and related foraminifera from the Lower Tertiay of Trinidad, B.W.I. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli & E. Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin . 215: 83-95. gs

Hernitz Kucenjak, M., Premec Fucek, V., Slavkovic, R. & Mesic, I. A. (2006). Planktonic foraminiferal biostratigraphy of the late Eocene and Oligocene in the Palmyride area, Syria. Geologia Croatica. 59: 19-39. gs

Hornibrook, N. d. B. (1990). Chiloguembelina cubensis (Palmer) and C. ototara (Finlay), in New Zealand. Journal of Foraminiferal Research. 20(4): 368-371. gs

Leckie, R. M., Farnham, C. & Schmidt, M. G. (1993). Oligocene planktonic foraminifer biostratigraphy of Hole 803D (Ontong Java Plateau) and Hole 628A (Little Bahama Bank), and comparison with the southern high latitudes. Proceedings of the Ocean Drilling Program, Scientific Results. 130: 113-136. gs

Palmer, D. K. (1934). The Foraminiferal Genus Guembelina in the Tertiary of Cuba. Memorias de la Sociedad Cubana de Historia Natural “Felipe Poey”. 8(2): 73-76. gs

Premec Fucek, V., Hernitz Kucenjak, M. & Huber, B. T. (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene Chiloguembelina and Jenkinsina. In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 46(Chap 17): 459-480. gs

Spezzaferri, S. & Premoli Silva, I. (1991). Oligocene planktonic foraminiferal biostratigraphy and paleoclimatic interpretation from Hole 538A, DSDP Leg 77, Gulf of Mexico. Palaeogeography Palaeoclimatology Palaeoecology. 83: 217-263. gs

Chiloguembelina adriatica compiled by the pforams@mikrotax project team viewed: 29-9-2023

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test outline:	Triangular	chamber arrangement:	Biserial	edge view:	Equally biconvex	aperture:	Interiomarginal
sp chamber shape:	Globular	coiling axis:	N/A	periphery:	N/A	aperture border:	Thin lip
umb chbr shape:	Globular	umbilicus:	N/A	periph margin shape:	Broadly rounded	accessory apertures:	None
spiral sutures:	Moderately depressed	umb depth:	N/A	wall texture:	Finely costate	shell porosity:	Microperforate: <1µm
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	2-2	N.B. These characters are used for advanced search. N/A - not applicable