Citation: Quiltyella Coxall&Spezzaferri, in Spezzaferri et al. 2018taxonomic rank: genusType species: Clavigerinella nazcaensis Quilty 1976.Taxonomic discussion: The new genus Quiltyella Coxall and Spezzaferri has been erected to distinguish globigerinellids with distinctly elongate, sometimes extreme, chambers in the final whorl. Based on their typical wall texture and morphology, the species Q. nazcaensis and Q. clavacella cannot be attributed to existing digitate genera showing comparable morphologies such as Clavigerinella,Hastigerina/Hastigerinella and Beella. In particular, Quiltyella differs from Hastigerina/Hastigerinella by its higher pore concentration wall texture, and no evidence of triradiate spines typical of the latter (e.g., Hemleben and others, 1989). It differs from Clavigerinella by having a spinose wall texture with spines supported by spine collars which coalesce to form ridges typical of the bulloides-type wall texture (e.g., Hemleben and others, 1989; Hemleben and Olsson, 2006) and not weakly cancellate as in Clavigerinella (Coxall and Pearson, 2006). In the genus Beella the degree of elongation varies significantly between specimens (Coxall and others, 2007) whereas in adult specimens of Quiltyella all chambers of the last whorl are strongly elongated. [Spezzaferri et al. 2018]
Catalog entries:
Distinguishing features: Parent taxon (Globigerinidae): Wall spinose, usually with 3½-6 globular chambers in final whorl, trochospiral or planispiral This taxon: Like Globigerinella but adult chambers radially elongate. (Oligocene - Mid Miocene)
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 trochospiral generally consisting of 3 whorls, it may became slightly planispiral in the last whorl, 5-6 chambers in the last whorl often strongly radially elongated and developing a knob-like distal termination, the size and development of this feature varies significantly among species, sutures straight and depressed to slightly arched on both sides. Aperture at the base of the last chamber interiomarginal but strongly tending to encompass the peripheral margin, a symmetrical arch, sometimes bordered by a distinct rim. [Spezzaferri et al. 2018] Wall type: Spinose, spines are supported by spine collars which coalesce to form ridges. Pore concentrations ranging from 120-160 pores/50 μm2 test surface area and pore diameters range from around 1.2-2 μm. [Spezzaferri et al. 2018]
Biogeography and Palaeobiology
Geographic distributionHighly restricted in some levels from the Paratethys and the Pacific Ocean. [Spezzaferri et al. 2018] Isotope paleobiologyAlthough no data are available on the species belonging to this genus, Coxall and others (2007) based on isotopic evidence, suggested that digitate morphologies are typical of deep, subthermocline (>150 m) habitat, characterized by lower temperatures, reduced oxygen content, and enrichment of dissolved inorganic carbon.[Spezzaferri et al. 2018]
Phylogenetic relationsWe tentatively propose that the genus evolved from Globigerinellaroeglina n. sp. in mid-Oligocene Zone O4. However, it is possible that species of Quiltyella, like many other clavate/digitate forms discussed here, represent independent derivations from a globigerinellid form close to G. obesa. [Spezzaferri et al. 2018]
Most likely ancestor:Globigerinella - at confidence level 2 (out of 5). Data source: Spezzaferri et al. 2018, p208.
Biostratigraphic distribution
Geological Range: Notes: The stratigraphic range of Quiltyella is uncertain because its occurrence is extremely sporadic. Based on the limited data we suggest it ranges from the lower Oligocene Zone O4 to somewhere in the lower or middle Miocene (Quilty, 1976). Last occurrence (top): at top of M4 zone (100% up, 16.4Ma, in Burdigalian stage). Data source: Total of ranges of the species in this database First occurrence (base): within O4 zone (28.09-29.18Ma, base in Rupelian stage). Data source: Total of ranges of species in this database
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
Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Globigerinidae
Primary source for this page: Spezzaferri et al. 2018 - Olig Atlas chap.6 p.206
References:
Coxall, H. K. & Pearson, P. N. (2006). Taxonomy, biostratigraphy, and phylogeny of the Hantkeninidae (Clavigerinella, Hantkenina and Cribrohantkenina). In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 41(Chap 8): 213-256. gsO
Coxall, H. K., Wilson, P. A., Pearson, P. N. & Sexton, P. F. (2007). Iterative evolution of digitate planktonic foraminifera. Paleobiology. 33: 495-516. gs
Hemleben, C. & Olsson, R. K. (2006). Wall textures of Eocene planktonic foraminifera. In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 41(Chap 4): 47-66. gsO
Hemleben, C., Spindler, M. & Anderson, O. (1989). Modern Planktonic Foraminifera. Springer-Verlag, New York. -. gs
Quilty, P. G. (1976). Planktonic foraminifera DSDP Leg 34, Nazca Plate. Initial Reports of the Deep Sea Drilling Project. 34: 629-703. gsO
Spezzaferri, S., Coxall, H. K., Olsson, R. K. & Hemleben, C. (2018a). Taxonomy, biostratigraphy, and phylogeny of Oligocene Globigerina, Globigerinella, and Quiltyella n. gen. 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 6): 179-214. gs
Quiltyella compiled by the pforams@mikrotax project teamviewed: 5-10-2024
