Pirumella


Classification: non_cocco -> Dinophytes -> Thoracosphaeraceae -> Oblique wall -> Pirumella
Sister taxa: Calcicarpinum, Melodomuncula, Pernambugia, Pirumella, Retesphaera

Distinguishing features: Cysts without external paratabulation, often with double-layered calcareous walls, oyter wall formed of blocky rhomboheda, c-axes oblique to wall.

Daughter taxa: (blue => in age window 0-800Ma)
Pirumella albiensis

Pirumella amplicrystallina

Pirumella bassriverensis

Pirumella cookii

Pirumella cumulosa

Pirumella cylindrica

Pirumella echinosa

Pirumella edgarii

Pirumella fusiformis

Pirumella heirtzleri

Pirumella hystrichosphaeroidea

Pirumella johnstonei

Pirumella krasheninnikovii

Pirumella labyrinthica

Pirumella laquaeta

Pirumella lepidota

Pirumella loeblichii

Pirumella longiporosa

Pirumella loricata

Pirumella mcnightii

Pirumella microspinosa

Pirumella miniaperta

Pirumella multistrata

Pirumella nonarenziae

Pirumella ossis

Pirumella pachystrata

Pirumella paradoxa

Pirumella parva

Pirumella pinguis

Pirumella piriformis

Pirumella porosa

Pirumella prasina

Pirumella quiltyi

Pirumella rhombica

Pirumella robinsonii

Pirumella rockeri

Pirumella scobidota

Pirumella sicelis

Pirumella sliteri

Pirumella sp.

Pirumella spathulata

Pirumella sphenifera

Pirumella spinosa

Pirumella squalida

Pirumella squamosa

Pirumella stellata

Pirumella strobila

Pirumella tanyphloia

Pirumella thayeri

Pirumella titanoplax

Pirumella toichohadra

Pirumella transitoria

Pirumella usheri

Pirumella williambensonii

Pirumella zuegelii

Taxonomy:

Citation: Pirumella Bolli 1980
Rank: Genus
Type species: Pirumella edithvincentiae Bolli 1980
Synonyms: Obliquipithonella Keupp in Keupp and Mutterlose, 1984
Taxonomic discussion: The generic name Obliquipithonella was very widely used for a long period but it is now accepted among most specialists that the name Pirumella has priority and so should be used (see the Dinoflaj website for more details).

Original diagnosis of Obliquipithonella from Keupp & Mutterlose (1984) Zysten ohne äußere Paratabulation, oft mit doppelschichtigen Kalkwänden. Die Außenwand aus schräg zur Oberfläche orientierten, blockigen bis verlängerten Kalzit-Rhomboedern aufgebaut. Hierzu gehören die unterkretazischen Artengruppen: Pithonella patriciagreeleyae/multistrata (vgl. KEUPP 1981: 27 ff.) Pithonella loeblichi BOLLI 1974 (vgl. KEUPP 1981: 58 ff.)

English translation: Cysts without external paratabulation, often with double-layered calcareous walls. The outer wall are built from blocky to elongated calcite rhombohedra oriented at an angle to the surface. These include the Lower Cretaceous species groups: Pithonella patriciagreeleyae/multistrata (cf. KEUPP 1981: 27 ff.) & Pithonella loeblichi BOLLI 1974 (cf. KEUPP 1981: 58 ff.)

Catalog entries: Pirumella [no catalog entry yet]

Distinguishing features: Cysts without external paratabulation, often with double-layered calcareous walls, oyter wall formed of blocky rhomboheda, c-axes oblique to wall.

Geological Range:
Last occurrence (top): within Zanclean Stage (3.60-5.33Ma, top in Zanclean stage). Data source: Total of range of species in this database
First occurrence (base): within Carnian Stage (228.35-237.00Ma, base in Carnian stage). Data source: Total of range of species in this database

References:

Bolli, H. M. (1974). Jurassic and Cretaceous Calcisphaerulidae from D.S.D.P. Leg 27, eastern Indian Ocean. Initial Reports of the Deep Sea Drilling Project. 27: 843-907. gs V O

Bolli, H. M. (1980). Calcisphaerulidae and Calpionellidae from the Upper Jurassic and Lower Cretaceous of D.S.D.P. Hole 416A, Moroccan Basin. Initial Reports of the Deep Sea Drilling Project. 50: 525-543. gs V O

Keupp, H. & Mutterlose, J. (1984). Organismen-Verteilung in den D-Beds von Speeton (Unterkreide, England) unter besonderer Berücksichtigung der kalkigen Dinoflagellaten-Zysten. Facies. 10: 153-178. gs

Keupp, H. (1981). Die kalkigen Dinoflagellaten-Zysten der borealen Unter-Kreide (Unter-Hauterivium bis Unter-Albium). Facies. 5: 1-190. gs


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Pirumella compiled by Jeremy R. Young viewed: 22-10-2020

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