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A new Cheirolepidiaceae (Coniferales) from the Early Jurassic of Patagonia (Argentina): Reconciling the records of impression and permineralized fossils.
Am J Bot. 2017 Feb; 104(2):322-334.AJ

Abstract

PREMISE OF THE STUDY

Plants preserved in different fossil modes provide complementary data concerning the paleobiology and evolutionary relationships among plant groups. New material from the Early Jurassic of Patagonia shows the importance of combining these sources of information, as we describe the first compression/impression fossils of Pararaucaria, a genus of the extinct conifer family Cheirolepidiaceae previously known from permineralized fossils. These fossils extend the temporal range of this genus and may allow its wider recognition in the fossil record.

METHODS

We studied fossil plants from the Early Jurassic (Pleinsbachian-Toarcian) locality of Taquetrén in Patagonia, Argentina using standard paleobotanical preparation and description techniques.

KEY RESULTS

Pararaucaria taquetrensis consists of isolated ovuliferous scales and small seed cones with helically arranged bract-scale complexes attached to scale-leaf foliage. Bract-scale complexes consist of separated bracts and ovuliferous scales with two seeds and three broad distal lobes.

CONCLUSIONS

Pararaucaria taquetrensis represents the oldest known Cheirolepidiaceae seed cones from the Southern Hemisphere, and this material highlights the importance of compression and impression fossils in understanding the distribution of fossil taxa. This material also suggests that Cheirolepidiaceae cone scales can be easily confused with those of another common conifer family, the Araucariaceae, which has important implications for accurately understanding Mesozoic conifer diversity and paleoecology.

Authors+Show Affiliations

Consejo Nacional de Investigaciones Cientificas y Tecnológicas. Museo Paleontológico Egidio Feruglio, Fontana Av. 140, Trelew, Chubut, 9100, Argentina iescapa@mef.org.ar.Department of Ecology and Evolutionary Biology, Brown University, Box G-W, 80 Waterman Street, Providence, Rhode Island 02906 USA.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28213347

Citation

Escapa, Ignacio, and Andrew Leslie. "A New Cheirolepidiaceae (Coniferales) From the Early Jurassic of Patagonia (Argentina): Reconciling the Records of Impression and Permineralized Fossils." American Journal of Botany, vol. 104, no. 2, 2017, pp. 322-334.
Escapa I, Leslie A. A new Cheirolepidiaceae (Coniferales) from the Early Jurassic of Patagonia (Argentina): Reconciling the records of impression and permineralized fossils. Am J Bot. 2017;104(2):322-334.
Escapa, I., & Leslie, A. (2017). A new Cheirolepidiaceae (Coniferales) from the Early Jurassic of Patagonia (Argentina): Reconciling the records of impression and permineralized fossils. American Journal of Botany, 104(2), 322-334. https://doi.org/10.3732/ajb.1600321
Escapa I, Leslie A. A New Cheirolepidiaceae (Coniferales) From the Early Jurassic of Patagonia (Argentina): Reconciling the Records of Impression and Permineralized Fossils. Am J Bot. 2017;104(2):322-334. PubMed PMID: 28213347.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A new Cheirolepidiaceae (Coniferales) from the Early Jurassic of Patagonia (Argentina): Reconciling the records of impression and permineralized fossils. AU - Escapa,Ignacio, AU - Leslie,Andrew, Y1 - 2017/02/17/ PY - 2016/09/01/received PY - 2017/01/04/accepted PY - 2017/2/19/pubmed PY - 2017/8/16/medline PY - 2017/2/19/entrez KW - Pararaucaria KW - conifer KW - paleobotany KW - seed cone SP - 322 EP - 334 JF - American journal of botany JO - Am. J. Bot. VL - 104 IS - 2 N2 - PREMISE OF THE STUDY: Plants preserved in different fossil modes provide complementary data concerning the paleobiology and evolutionary relationships among plant groups. New material from the Early Jurassic of Patagonia shows the importance of combining these sources of information, as we describe the first compression/impression fossils of Pararaucaria, a genus of the extinct conifer family Cheirolepidiaceae previously known from permineralized fossils. These fossils extend the temporal range of this genus and may allow its wider recognition in the fossil record. METHODS: We studied fossil plants from the Early Jurassic (Pleinsbachian-Toarcian) locality of Taquetrén in Patagonia, Argentina using standard paleobotanical preparation and description techniques. KEY RESULTS: Pararaucaria taquetrensis consists of isolated ovuliferous scales and small seed cones with helically arranged bract-scale complexes attached to scale-leaf foliage. Bract-scale complexes consist of separated bracts and ovuliferous scales with two seeds and three broad distal lobes. CONCLUSIONS: Pararaucaria taquetrensis represents the oldest known Cheirolepidiaceae seed cones from the Southern Hemisphere, and this material highlights the importance of compression and impression fossils in understanding the distribution of fossil taxa. This material also suggests that Cheirolepidiaceae cone scales can be easily confused with those of another common conifer family, the Araucariaceae, which has important implications for accurately understanding Mesozoic conifer diversity and paleoecology. SN - 1537-2197 UR - https://www.unboundmedicine.com/medline/citation/28213347/A_new_Cheirolepidiaceae__Coniferales__from_the_Early_Jurassic_of_Patagonia__Argentina_:_Reconciling_the_records_of_impression_and_permineralized_fossils_ L2 - https://doi.org/10.3732/ajb.1600321 DB - PRIME DP - Unbound Medicine ER -