NOMENCLATURAL NOTE ON SOME NEW COMBINATIONS IN <i>ARAUCARIOXYLON</i> KRAUS AND <i>PODOCARPOXYLON</i> GOTHAN (FOSSILS)

Trivedi, B. S.

doi:10.2307/1223385

Cited by 3 publications

(2 citation statements)

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“…1). An illustration of this astonishing evolution of nomenclature is exemplified by Trivedi & Srivastava (1990) who published four new combinations in Araucarioxylon, even though this name had already been stated to be a junior synonym, in the same journal (Vogellehner, 1964, who treated it as a synonym of Dadoxylon). It is noteworthy that few of the respondents who supported the use of Araucarioxylon have actually published material under this name.…”

Section: Poll Discussionmentioning

confidence: 99%

Which name(s) should be used for Araucaria‐like fossil wood?—Results of a poll

Cittert

McLoughlin

Zijlstra

et al. 2014

TAXON

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Araucarioxylon Kraus is a widely known fossil-genus generally applied to woods similar to that of the extant Araucariaceae. However, since 1905, several researchers have pointed out that this name is an illegitimate junior nomenclatural synonym. At least four generic names are in current use for fossil wood of this type: Agathoxylon Hartig, Araucarioxylon, Dadoxylon Endl. and Dammaroxylon J.Schultze-Motel. This problem of inconsistent nomenclatural application is compounded by the fact that woods of this type represent a wide range of plants including basal pteridosperms, cordaitaleans, glossopterids, primitive conifers, and araucarian conifers, with a fossil record that extends from the Devonian to Holocene. Conservation of Araucarioxylon has been repeatedly suggested but never officially proposed. Since general use is a strong argument for conservation, a poll was conducted amongst fossil wood anatomists in order to canvass current and preferred usage. It was found that the community is divided, with about one-fifth recommending retention of the well-known Araucarioxylon, whereas the majority of others advocated use of the legitimate Agathoxylon. The arguments of the various colleagues who answered the poll are synthesized and discussed. There is clearly little support for conservation of Araucarioxylon. A secondary aspect of the poll tackled the issue as to whether Araucaria-like fossil woods should be either gathered into a unique fossil-genus, or whether two fossil-genera should be recognized, based on the respective presence or absence of axial parenchyma. A majority of colleagues favoured having one fossil-genus only. Agathoxylon can be used legitimately and appears to be the most appropriate name for such woods. However, its original diagnosis must be expanded if those woods lacking axial parenchyma are to be included.

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Section: Poll Discussionmentioning

confidence: 99%

Which name(s) should be used for Araucaria‐like fossil wood?—Results of a poll

Cittert

McLoughlin

Zijlstra

et al. 2014

TAXON

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“…In contrast to China and Japan of eastern Asia, there are very little megafossil evidences of gymnosperms from the Indian Cenozoic. In India, gymnosperms represented by conifers (Podocarpaceae or Araucariaceae) are reported from the early Tertiary Deccan Intertrappean beds (Sahni 1931;Prakash 1957;Chitaley and Sheikh 1973;Sheikh and Kolhe 1982;Srivastava 1989, 1990;Mehrotra and Srivastava 1994), middle Tertiary of Cuddalore Sandstone on the eastern coast of peninsular India (Trivedi and Srivastava 1990), Tertiary of Bengal basin (Bera and Sen 2004), Oligocene of Assam (Awasthi et al 1992) and Oligocene of Mizoram (Tiwari and Mehrotra 2002). Paradkar (1976) reported a cycadalean ovule from the early Tertiary Deccan Intertrappean beds.…”

Section: Tsugamentioning

confidence: 99%

First discovery of fossil winged seeds of Pinus L. (family Pinaceae) from the Indian Cenozoic and its palaeobiogeographic significance

Khan

Bera

2017

J Earth Syst Sci

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The occurrences of Pinus L. (family Pinaceae) megafossils (cones and leaf remains) have been abundantly documented from the Cenozoic sediments of eastern Asia (Japan and China), but none has been confirmed from the Indian Cenozoic till date. Here, we describe Pinus arunachalensis Khan and Bera, sp. nov. on the basis of seed remains from the middle to late Miocene Siwalik sediments of the Dafla Formation exposed around West Kameng district in Arunachal Pradesh, eastern Himalaya. Seeds are winged, broadly oblong to oval in outline, 1.3-1.5 cm long and 0.4-0.6 cm broad (in the middle part), located basipetally and symmetrically to wing, cellular pattern of wing is seemingly undulatory and parallel with the long axis of the wing. So far, this report provides the first ever fossil record of Pinus winged seeds from India. This record suggests that Pinus was an important component of tropical-subtropical evergreen forest in the area during the Miocene and this group subsequently declined from the local vegetation probably because of the gradual intensification of MSI (monsoon index) from the Miocene to the present. We also review the historical phytogeography and highlight the phytogeographic implication of this genus.

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