Oxfordiana motturii

Name

Oxfordiana motturii

Rank

Species

Generic Name

[Genus] Oxfordiana

Authors (Name)

Spencer A. R. T. Hilton J.  

Authors (Pub.)

Spencer A. R. T. Garwood R. J. Rees A. R. Raine R. J. Rothwell G. W. Hollingworth N. T. J. Hilton J.  

Publication

New insights into Mesozoic cycad evolution: an exploration of anatomically preserved Cycadaceae seeds from the Jurassic Oxford Clay biota [2017/8]

Journal

PeerJ

Volume

5

Issue

e3723

Page number

15

Year

2017

Fossil Status

seeds

Stratigraphy

Oxfordian

Strat. comment

Uppermost Stewartby Mbr to lowermost Weymouth Mbr of the Oxford Clay Fm.

Location

Marston Maisey, near Cirencester, Cotswold District of Gloucestershire, England, U.K.

Paleoregion

Eurasia (Europe)

Data for Holotypus

Repository

Lapworth Geological Museum, University of Birmingham, Birmingham, U.K.

Repository Number

BU 5265 consisting of 4 parts (BU 5265.1–4)

Num

3

Pub.

New insights into Mesozoic cycad evolution: an exploration of anatomically preserved Cycadaceae seeds from the Jurassic Oxford Clay biota [2017/8]

Data for Paratypus

Repository

Lapworth Geological Museum, University of Birmingham, Birmingham, U.K.

Repository Number

BU 5266

Num

4

Descr.

collected from Dix Pit at Stanton Harcourt

Pub.

New insights into Mesozoic cycad evolution: an exploration of anatomically preserved Cycadaceae seeds from the Jurassic Oxford Clay biota [2017/8]

Diagnosis

Twelve ribs rounded in profile, narrower in basal 1/3 of ovule with adjacent ribs merging together. Less pronounced in apical 1/3 of ovule. Integument thickest at center of ribs. Thinning laterally and thinnest in furrows between ribs. Outer integument forming thin, fibrous palisade of elongate, thick-walled cells aligned perpendicular to ovule body. Middle integument thickest, comprising variable-sized isodiametric parenchyma cells aligned perpendicular to outer integument in rib furrows, becoming parallel within ribs, thus symmetrical along the rib mid-line. Inner integumentary layer represented by two to five rows of small, thin-walled, elongate parenchyma cells aligned with ovule circumference. Integument with conical micropyle. Pollen chamber with small nucellar beak that projects into micropyle.