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Taxonomy, ontogeny and paleoecology of two species of Harbinia Tsao, 1959 (Crustacea, Ostracoda) from the Santana Formation, Lower Cretaceous, northeastern Brazil

Lucas Silveira Antonietto, Silvia Regina Gobbo, Dermeval Aparecido do Carmo, Mario Luiz Assine, Maria Alice Morgado Castanheira Cordeiro Fernandes and Jose Eduardo Lima e Silva
Taxonomy, ontogeny and paleoecology of two species of Harbinia Tsao, 1959 (Crustacea, Ostracoda) from the Santana Formation, Lower Cretaceous, northeastern Brazil
Journal of Paleontology (July 2012) 86 (4): 659-668

Abstract

The Araripe Basin is the most extensive interior basin in northeastern Brazil, comprising areas of Ceara, Piaui and Pernambuco states. The Santana Formation, attributed to the Aptian-?lower Albian age of the basin, is subdivided into two members, Crato and Romualdo, which bear an abundant fossil record of plant fragments, arthropods and vertebrates, especially 3D-preserved fishes. The present study focuses on the taxonomy, ontogeny and paleoecology of two ostracode species from the Romualdo Member and the top section of the Crato Member (Ipubi layers), Harbinia salitrensis (Krommelbein and Weber, 1971) emend. and H. alta new species. The ontogenetic series for both species are illustrated, except for the A-8 instar; H. salitrensis is also redescribed. The present work is also the first to produce quantitative information about the paleoecology of the Santana Formation based on ostracode populations. The results obtained from analyses of the population age-structure of both species, in addition to dominance (Simpson) and diversity index (Shannon) values, corroborated previous data on the studied sequence. According to these results, the strata were deposited in a limnic, low-to-moderate energy environment with salinity levels varying from oligohaline to mesohaline. The new data indicate the possibility of these environments also being hypersaline.


ISSN: 0022-3360
EISSN: 1937-2337
Coden: JPALAZ
Serial Title: Journal of Paleontology
Serial Volume: 86
Serial Issue: 4
Title: Taxonomy, ontogeny and paleoecology of two species of Harbinia Tsao, 1959 (Crustacea, Ostracoda) from the Santana Formation, Lower Cretaceous, northeastern Brazil
Affiliation: Universidade de Brasilia, Brasilia, Brazil
Pages: 659-668
Published: 201207
Text Language: English
Publisher: Paleontological Society, Lawrence, KS, United States
References: 49
Accession Number: 2012-075190
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., 1 plate, 4 tables, sketch map
S07°40'00" - S07°10'00", W40°15'00" - W39°15'00"
Secondary Affiliation: Universidade Estadual Paulista Julio de Mesquita Filho, BRA, Brazil
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, The Paleontological Society. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201239
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