<i>Pityostrobus andraei</i> (Pinaceae) from the Barremian (Lower Cretaceous) of Belgium: A Morphometric Revision

Brito, Léa De; Prestianni, Cyrille

doi:10.1086/712355

Cited by 1 publication

(8 citation statements)

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“…Notably, within P. andraei , Alvin (1953) included a particularly large spectrum of cone shapes. We were able, based on qualitative characters, to isolate morphotypes A, C, F, G, H, I, J, K, and L from the P. andraei designated specimens (see De Brito and Prestianni [2021] and Appendix S2). Despite the exclusion of these nine morphotypes, the cone shape variability found for the remaining specimens remains much higher than that of other species, including extant ones (see Figure 8).…”

Section: Discussionmentioning

confidence: 99%

“…Fixed landmarks types: type I, A1; type II, B1; Type III, B2. (C–G) Illustration of eight measurements applied to the ovulate cones following the methods of De Brito and Prestianni (2021): (C1) cone length; (D2) maximal cone width; (E3) cone diameter midway between the base and the maximum diameter; (F4) width of the scale apophysis in the middle of the cone; (F5) height of the scale apophysis in the middle of the cone; (G) gyre (g) and scale (s).…”

Section: Methodsmentioning

confidence: 99%

“…Ten measurements were taken on 208 ovulate cones to characterize cone morphology with a linear method, following the protocol described by De Brito and Prestianni (2021), Gil et al (2002), Marcysiak (2004) (Figure 3C–G): (1) cone length, (2) maximal cone width, (3) cone diameter midway between the base and the maximum diameter, (4) width of the scale apophysis in the middle of the cone, (5) height of the scale apophysis in the middle of the cone, (6) number of scales, and (7) number of gyres along an orthostichy (Appendix S5, Table S1; Appendix S6, Table S1). Measurements were taken digitally with ImageJ/Fiji software (cf.…”

Section: Methodsmentioning

confidence: 99%

“…They were distributed a priori to distinct morphotypes based on qualitative characters. Five morphotypes, named A, C, F, G, and H, were briefly described by De Brito and Prestianni (2021) with the same associated letters (Figure 2L, O-R). Four additional morphotypes are included in this study with the names I, J, K, and L (Figure 2J, M, N, S).…”

Section: Fossil Samplingmentioning

confidence: 99%

“…As discussed by De Brito and Prestianni (2021), the intraspecific variability of Belgian Cretaceous cones has been overestimated, concealing a larger taxonomic diversity. Nine species that were described in the 20 th century encompassed a large intraspecific morphological variability (Alvin, 1953(Alvin, , 1957(Alvin, , 1960.…”

Section: Analysis Of Cone and Scale Shape Variations Among Pinaceous ...mentioning

confidence: 99%

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Morphological disparity of extant and extinct pinaceous ovulate cones: How many cones are enough?

Brito

Fischer

Prestianni

2022

American J of Botany

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Premise: The expansion of Pinaceae during the Cretaceous is exemplified by the numerous ovulate cone taxa found in western Europe and North America. The Belgian Wealden facies deposits have delivered hundreds of exceptionally wellpreserved yet isolated pinaceous ovulate cones; these cones were placed by convention within form-genera. Ten species have been described in Belgium, representing about 20% of the known fossil record of this period. However, the validity of these taxa is questionable because their intra-and interspecific variabilities have never been thoroughly studied. Moreover, quantifying the expansion of Pinaceae in terms of morphospace occupation is desirable to reveal the dynamics of this critical radiation. Methods: We used linear and geometric morphometry to quantify the shape of the extensive sample of Cretaceous cones of Belgium. These methods were also applied to extant pinaceous species to compare the morphological disparity of Cretaceous assemblages against those of today in selected ecosystems. We used ordination methods (PCA) to visualize morphospace occupation and test for species delineation. Results: The morphological disparity was not higher in fossil species than in extant species we sampled. Both morphological approaches confirmed that the species Pityostrobus andraei presents high morphological variability. Our resampling tests indicate that ovulate cone morphological variability can be satisfactorily quantified with as few as 15 specimens. Conclusions: The methodology used here is relevant for quantifying both the variability and the diversity of many fossil assemblages, paving the way for a more robust evaluation of Cretaceous pinaceous diversity.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Fossil Samplingmentioning

confidence: 99%

Section: Analysis Of Cone and Scale Shape Variations Among Pinaceous ...mentioning

confidence: 99%

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