Nannotax3 - Mesozoic - Bilapillus wadeae

Bilapillus wadeae

Classification: Mesozoic -> Holococcoliths -> Rarer genera -> Bilapillus -> Bilapillus wadeae
Sister taxa: B. wadeae, B. sp.,

BownLeesYoung 2017 f4 18.JPG
Lees 2007 pl13 36-37.jpg
Blair Watkins 2009 pl1 04.JPG
Blair Watkins 2009 pl1 01-03.JPG
Lees 2007 pl13 34-35.jpg
Lees 2007 pl13 38-39.jpg
Blair Watkins 2009 pl1 05.JPG
Lees 2007 pl13 40-41.jpg
Lees 2007 pl13 42-43.jpg
Lees 2007 pl13 44-45.jpg

Taxonomy:

Citation: Bilapillus wadeae Lees, 2007

Rank: Species

Synonyms:

Bifidalithus phenax Blair & Watkins (2009) [cf. R. Howe, pers. comm. 2015; interpretation of J. Lees 2017]

Farinacci & Howe catalog pages: Bilapillus wadeae * , Bifidalithus phenax *

Morphology remarks: Simlar to Lucianorhabdus compactus but smaller. "A small species of Bilapillus. The illustrations in Pl.13, figs 44, 45 appear to show perforations in the central blocks." [Lees 2007]

Size: 2.5-4µm long (Blair & Watkins, 2009); Holotype dimensions: L = 3.30μm, W = 2.20μm.

Search data:

Tags	LITHS: holococcolith, elliptical, CA: pores, V-UNITS: V-prominent, R-UNITS: R-prominent, DETAILS: rim-unicyclic,
Metrics	Lith size: 2->4µm; Segments: 2->2; Sources: original description & illustrated specimens

The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Santonian Stage (83.64-86.26Ma, top in Santonian stage). Data source: Blair & Watkins (2009)
First occurrence (base): within Cenomanian Stage (93.90-100.50Ma, base in Cenomanian stage). Data source: Lees 2007 (original description)

Plot of occurrence data:

(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Bilapillus

References:

Blair, S. A. & Watkins, D. K. (2009). High-resolution calcareous nannofossil biostratigraphy for the Coniacian/Santonian Stage boundary, Western Interior Basin. Cretaceous Research. 30(2): 367-384. gs :: ::

Bown, P. R., Lees, J. A. & Young, J. R. (2017). On the Cretaceous origin of the Order Syracosphaerales and the genus Syracosphaera. Journal of Micropalaeontology. 36(2): 153-165. gs :: view :: open

Lees, J. A. (2007). New and rarely reported calcareous nannofossils from the Late Cretaceous of coastal Tanzania: outcrop samples and Tanzania Drilling Project Sites 5, 9 and 15. Journal of Nannoplankton Research. 29(1): 39-65. gs :: view :: open