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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Planothidium scrobiculatum sp. nov. (Bacillariophyta), a new monoraphid diatom from freshwater Pleistocene deposits of South America

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Author(s):
Marquardt, Gisele C. [1] ; Bicudo, Denise C. [2] ; de Bicudo, Carlos E. M. [2] ; Ledru, Marie-Pierre [3] ; Ector, Luc [4] ; Wetzel, Carlos E. [4]
Total Authors: 6
Affiliation:
[1] Univ Guarulhos, Ctr Posgrad Pesquisa & Extensa CEPPE, Praca Tereza Cristina 88, BR-07023070 Guarulhos, SP - Brazil
[2] Inst Bot, Ecol Dept, Av Miguel Estfano 3687, BR-0430012 Sao Paulo, SP - Brazil
[3] Univ Montpellier, ISEM, CNRS, IRD, EPHE, F-34095 Montpellier - France
[4] Luxembourg Inst Sci & Technol LIST, Environm Res & Innovat Dept ERIN, 41 Rue Brill, L-4422 Belvaux - Luxembourg
Total Affiliations: 4
Document type: Journal article
Source: Fottea; v. 21, n. 1, p. 53-61, 2021.
Web of Science Citations: 0
Abstract

A new monoraphid diatom species appeared successively in paleolimnological records from a Quaternary sediment core (1.5 +/- 0.1 Ma) retrieved from Colonia basin (Brazilian Coastal Plain, Atlantic Forest, Sao Paulo Metropolitan Region), and is formally described as Planothidium scrobiculatum sp. nov. We studied the new species through light and scanning electron microscopy and discussed its similarity to other members of the genus. The new species has a unique combination of morphological features that allow its separation from all other species in the genus: (1) lanceolate valve outline with cuneate apices, (2) multiseriate striae composed of two to four rows of irregular sized areolae on the rapheless sternum valve (SV), not interrupted at the valve mantle junction, and (3) arrangement of areolae on the valve mantle, grouped in 3 or 4 rows, each composed of 2 to 3 areolae on the SV. Nevertheless, the new species main diagnostic feature is the occurrence of numerous, unusual, small shallow depressions externally located on the SV along the axial area, cavum, and virgae. As a result, P. scrobiculatrim is different from similar species under LM and SEM by some evident characters or a combination of characters. This study contributes to the knowledge of the so far understudied biodiversity of microorganisms of tropical regions. In addition, the above-mentioned diversity patterns and the wealth of new diatom taxa inside and around the Colonia basin (many yet to be described) suggest that further samplings from other localities may provide an insight into its habitat preferences and range, since this area is an exceptional biological entity, worthy of further study. (AU)

FAPESP's process: 17/50341-0 - Challenges for biodiversity conservation facing climate changes, pollution, land use and occupation (PDIp)
Grantee:Luiz Mauro Barbosa
Support Opportunities: Research Grants - State Research Institutes Modernization Program
FAPESP's process: 13/50297-0 - Dimensions US-BIOTA São Paulo: a multidisciplinary framework for biodiversity prediction in the Brazilian Atlantic forest hotspot
Grantee:Cristina Yumi Miyaki
Support Opportunities: BIOTA-FAPESP Program - Thematic Grants