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An Isopod from the Codó Formation (Aptian of the Parnaíba Basin), Northeastern Brazil Um Isópode Da Formação Codó (Aptiano Da Bacia Do Parnaíba), Nordeste Do Brasil

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An Isopod from the Codó Formation (Aptian of the Parnaíba Basin), Northeastern Brazil Um Isópode Da Formação Codó (Aptiano Da Bacia Do Parnaíba), Nordeste Do Brasil DOI: xxxxxxxxxxxxxx An isopod from the Codó Formation (Aptian of the Parnaíba Basin), Northeastern Brazil Um isópode da Formação Codó (Aptiano da Bacia do Parnaíba), Nordeste do Brasil 1 1 2 Rafael Matos Lindoso *, Ismar de Souza Carvalho , Ighor Dienes Mendes ABSTRACT: The Codó Formation is a lithostratigraphic unit RESUMO: A Formação Codó constitui unidade litoestratigráfica com pre- with predominant carbonate sedimentation of the Aptian age situ- domínio de sedimentação carbonática de idade aptiana, e situa-se na bacia ated in the intracratonic Parnaíba Basin. In this formation, the only intracratônica do Parnaíba. Nessa formação, os crustáceos eram conhecidos known crustaceans were conchostracans and ostracods. Systematic apenas por conchostráceos e ostracodes. Coletas sistemáticas realizadas no mu- collections conducted in the Brejo city, in the Maranhão State, have nicípio de Brejo, Maranhão, proveram novos taxa para a citada unidade provided new taxa for the cited lithostratigraphic unit. A new genus litoestratigráfica. Um novo gênero e espécie de isópode é descrito apresentando and species of isopod is described with the following set of features: o conjunto de caracteres: céfalon elíptico, profundamente inserido no pri- cephalon elliptical deeply inserted in the first pereionite; eyes locat- meiro pereionite; olhos localizados dorsolateralmente; corpo oblongo-ovalar; ed dorsolaterally; body oblong oval; and isomorphic pereionites and e presença de pereionites e pleonites isomórficos indicando afinidade com a pleonites, which indicate an affinity with the family Archaeoniscidae. família Archaeoniscidae. A ocorrência deste táxon em depósitos calcários da The presence of this taxon in the limestone deposits from the Codó Formação Codó reforça prévias inferências de paleoambiente lagunar/mari- Formation reinforces prior inference of a lacustrine/marine paleoen- nho, e demonstra uma diversidade maior de artrópodes aquáticos durante a vironments, and indicates a greater diversity of aquatic arthropods abertura do Atlântico Sul no Cretáceo Inferior. during the opening of the South Atlantic in the Early Cretaceous. Palavras-chave: Archaeoniscidae; Formação Codó; Bacia KEYWORDS: Archaeoniscidae; Codó Formation; Parnaíba Basin. do Parnaíba. INTRODUCTION the most significant of these fossils and can be correlat- ed to the Santana Formation in the Araripe Basin and The Codó Formation is distributed over an area of ap- Riachuelo Formation in the Sergipe/Alagoas Basin (Santos proximately 170,000 km2 (Lima 1982) and is part of the & Carvalho 2009). Mesozoic sedimentary sequences in the Parnaíba Basin. Crustaceans in these deposits are rare and poor- This lithostratigraphic unit is composed of bituminous ly studied; until recently, they were only represent- shales, evaporites, limestones, and sandstones formed un- ed by ostracods and conchostracans (Cardoso 1962, der low-energy lacustrine environmental conditions with Leite et al. 1975, Lima & Leite 1978, Krömmelbein & water stratification, which resulted in episodes of anox- Weber 1985, Silva et al. 1985, 1989). In the city of Brejo ia (Reis & Caputo 2007). Faciological and palynostrati- (Fig. 1), northeastern Maranhão, outcrops attributed to graphic studies of this unit indicate an Aptian/Albian the Codó Formation occur in open pit mines at two lo- age (Lima 1982, Rossetti et al. 2001, Antonioli 2001). cations: Faveirinha Quarry and Perneta Ranch. In these Fossil occurrences date back to the first half of the 20th outcrops, the collections have allowed finding new crus- century and include fishes, crustaceans, plants, insects, taceans such as decapods and a rare appendage print, and gastropods (Lisboa 1914, Cardoso 1962, Pinto & which might be related to the infraorder Brachyura Ornellas 1974, Lima & Leite 1978). The ichthyofauna is (Lindoso et al. 2011). 1Federal University of Rio de Janeiro, Cidade Universitária, Ilha do Fundão (RJ), Brazil. E-mails: [email protected]; [email protected] 2Federal University of Maranhão, Campus do Bacanga, São Luís (MA), Brazil. E-mail: [email protected] *Corresponding author Manuscrito ID 25778. Recebido em: 03/02/2012. Aprovado em: 11/10/2012 16 Brazilian Journal of Geology, 43(1): 16-21, March 2013 Rafael Matos Lindoso et al. This study aims to describe a new genus and species of drain the central basin at the confluence of the Tocantins isopod for the Codó Formation (Aptian of the Parnaíba and Araguaia rivers, approaching the Parnaíba River, Basin), which is the third species from Brazil described in the Brejo city and Codó (Santos & Carvalho 2009). for the Cretaceous. Paleoenvironmental inferences are also The inferred age for these deposits is Aptian/Albian made from this new fossil. (Lima 1982), and their strata are deposited in an arid to semiarid climate regime (Rossetti et al. 2001). Geological setting According to Lima & Leite (1978), paleontologi- The new isopod comes from the intracratonic Parnaíba cal data indicate deposition occurred under marine and Basin located in a large area of the western portion of brackish lacustrine environments. The stratigraphic Northeast Brazil, covering the states of Maranhão, Piauí and faciological analyses in the region of Codó, Maranhão and part of Tocantins, Pará, Ceará and Goiás. This basin State, by Rossetti et al. (2001) indicated three depositional has a total area of 600,000 km2, and its sedimentary suc- environments: (1) central lake; (2) transitional lake; and cession is 3,500 m thick in its depocenter, 500 m of which (3) marginal lake. The depositional environments were in- belong to Mesozoic rocks (Campbell 1949, Mesner & terpreted in the upper sequence, which corresponds to an Wooldridge 1964). upper shoreface, interdistributary lagoon/bay, suspension The sedimentary and magmatic succession of the lobe, and distributary channel (Rossetti et al. 2001, Paz & Parnaíba Basin is divided into five supersequences: Rossetti 2001). In a palynostratigraphic study, Antonioli Silurian, Middle-Devonian, Early-Carboniferous, Late- (2001) divided the Codó Formation into three lithostrati- Carboniferous-Early-Triassic, Jurassic, and Cretaceous, graphic units: (1) Lower, which had an incipient marine and the latter consists of the following formations: Corda, character; (2) Middle, which was essentially evaporitic; Grajaú, Codó and Itapecuru (Vaz et al. 2007). However, and (3) Upper, which had a marine character. according to Carneiro (1974) and Rezende (2002), the Corda, Grajaú and Codó formations are interfingered and chronostratigraphically equivalent. The Corda Formation MaTerIals aND MeThODs is composed of reddish-brown, very fine, semi-friable and semi-cohesive sandstones. The Grajaú Formation, in Nine isopods were collected in the Faveirinha turn, consists of whitish-pale-beige medium/coarse sand- Quarry (42º44’45,4’’W and 03º49’20,1’’S) and Perneta stones and conglomeratic levels. In the Codó Formation, Ranch (42º44’21,1’’ W and 03º48’50,0’’S), located ap- there are bituminous shales, siltstones, limestones, evap- proximately 20 km from the city of Brejo, northeastern orites, and sandstones. Superimposed on these depos- Maranhão. These outcrops have a predominantly carbon- its is the Itapecuru Formation of the Middle-Albian-Late atic lithology interbedded with marls; the Faveirinha Quarry Cretaceous age, which is composed of fine, friable sand- is currently abandoned (Fig. 2). The specimen UFRJ DG stones and pelites (Vaz et al. 2007). 170-Cr is bidimensionally preserved in a fragment of mas- The areas where the Codó Formation occurs are sive limestone, which was subjected to mechanical prepara- restricted and discontinuous, appearing in river beds that tion techniques and photographed under a binocular Carl Zeiss Discovery v.12 lens. It is housed in the paleontolog- W 48º00’ ical collection of the Geology Department of the Federal São Luís University of Rio de Janeiro. Brejo PALEONTOLOGICAL SYSTEMATICS Maranhão Brazil MALACOSTRACA Latreille, 1802 ISOPODA Latreille, 1817 S 07º00’ SPHAEROMATIDEA Wägele, 1989 SPHAEROMATOIDEA Latreille, 1825 ARCHAEONISCIDAE Haack, 1918 Codoisopus gen. nov. (Fig. 3) Etymology. The generic name refers to the Codó Formation, the lithostratigraphic unit where the specimen Figure 1. Location of the city of Brejo, Maranhão State. comes from. 17 Brazilian Journal of Geology, 43(1): 16-21, March 2013 An isopod from the Codó Formation Diagnosis. The same as for the species. Codoisopus brejensis and abdominal somites, which gives it an oblong-oval gen. nov. et sp. nov. shape. Antennules and antennae are not preserved. Etymology. The specific designation, brejensis (latin), Exopodites only occur as printings. The pleotelson is sub- refers to Brejo city. triangular and twice the length of the pereon. Holotype. UFRJ DG 170-Cr Location. Faveirinha Quarry, city of Brejo, Maranhão State. DISCUSSION Stratigraphic Context. Parnaíba Basin, Codó Formation, Lower Cretaceous (Aptian). The fossil record for isopods has been limited, partly Diagnosis. Body oblong-oval measuring 13 mm length due to their small size (usually less than 30 mm) and del- and 7 mm width. Cephalon elliptical deeply inserted with- icate structure (Taylor 1972). Therefore, isopods are rare in the first pereionite. Dorsolateral eyes; somites thoracic but important ecological forms, especially in benthic ma- and abdominal isomorphic (seven pereionites and five pleo- rine habitats (Ruppert et al. 2005). nites). Pleotelson small, subtriangular, having half the length The occurrence of these crustaceans in Brazil
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