Morphological re-evaluation of Callumispora Bharadwaj & Srivastava 1969 and Punctatisporites Ibrahim 1933 emend. Potonié & Kremp 1954 and their taxonomic implications - 02/03/26
, Pauline Sabina Kavali a, ⁎
, Mercedes di Pasquo c
, Omnath Saha d
, Runcie Paul Mathews aHighlights |
• | The taxonomic status of the morpho genus Callumispora Bharadwaj and Srivastava 1969 is reviewed to validate the long pending debate regarding its taxonomic status as congeneric to Punctatisporites Ibrahim 1933 emend. Potonié and Kremp 1954. |
• | It is based on restudy of the type materials in conjunction with original and emended contributions and new material. |
• | Re-evaluation shows similarities in all morphological features, re-affirming that Punctatisporites and Callumispora are congeneric and Callumispora is junior synonym of Punctatisporites by taxonomic rule of priority. |
Abstract |
The taxonomic status of the late Paleozoic morphogenus Callumispora Bharadwaj & Srivastava is reviewed to validate the long pending debate regarding its congeneric link to Punctatisporites Ibrahim, emend. Potonié & Kremp. As on record, 25 species of both Punctatisporites (13) and Callumispora (12) were described by Indian workers. In this study, available holotypes and paratypes, along with original illustrations and diagnoses, were re-examined, and images were captured both under an optical light microscope and a Confocal Laser Scanning Microscope. New material collected from the Damodar Basin (east India) and Wardha Basin (central India) were macerated and specimens illustrated with a Scanning Electron Microscope and compared with images of Punctatisporites documented in South America and Callumispora specimens from India. The five main morphological features which formed the main criteria to distinguish the two genera were re-evaluated viz., amb, size, haptotypic structure, exine thickness and exine structure. The critical re-analysis revealed that Punctatisporites and Callumsipora both possess circular to subcircular amb, their exine varies from laevigate to infrapunctate, their size ranges from 24 to 140 µm, the length of the trilete ray ranges from ½ to ¾ th the spore radius or more, the thickness of the exine also ranges from 1 to 6 µm. Based on all morphological similarities, it is evident that Punctatisporites and Callumispora are congeneric, Callumispora being junior synonym of Punctatisporites by taxonomic rule of priority. This synonymization avoids the superfluous proliferation of taxon names that prevent biostratigraphic correlations and paleobiogeographic analyses.
Le texte complet de cet article est disponible en PDF.Keywords : Callumispora , Punctatisporites , Taxonomy, Synonymy, Late Paleozoic, India
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Vol 90
Article 100877- avril 2026 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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