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Pectinidae: Mollusca, Bivalvia) from Pliocene Deposits (Almería, Se Spain)

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Pectinidae: Mollusca, Bivalvia) from Pliocene Deposits (Almería, Se Spain) SCALLOPS FROM PLIOCENE DEPOSITS OF ALMERÍA 1 TAXONOMIC STUDY OF SCALLOPS (PECTINIDAE: MOLLUSCA, BIVALVIA) FROM PLIOCENE DEPOSITS (ALMERÍA, SE SPAIN) Antonio P. JIMÉNEZ, Julio AGUIRRE*, and Pas- cual RIVAS Departamento Estratigrafía y Paleontología. Facultad de Ciencias. Fuentenue- va s/n. Universidad de Granada. 18002-Granada (Spain), and Centro Anda- luz de Medio Ambiente, Avda. del Mediterráneo s/n, Parque de las Ciencias, 18071-Granada. (* corresponding author: [email protected]) Jiménez, A. P., Aguirre, J. & Rivas, P. 2009. Taxonomic study of scallops (Pectinidae: Mollusca, Bivalvia) from Pliocene deposits (Almería, SE Spain). [Estudio taxonómico de los pectínidos (Pectinidae: Mollusca, Bivalvia) del Plioceno de la Provincia de Almería (SE España).] Revista Española de Paleontología, 24 (1), 1-30. ISSN 0213-6937. ABSTRACT A taxonomic study has been carried out on scallops (family Pectinidae: Mollusca, Bivalvia) occurring in the low- er-earliest middle Pliocene deposits of the Campo de Dalías, Almería-Níjar Basin, and Carboneras Basin (prov- ince of Almería, SE Spain). The recently proposed suprageneric phylogenetic classification scheme for the fam- ily (Waller, 2006a) has been followed. Twenty-two species in twelve genera (Aequipecten, Amusium, Chlamys, Flabellipecten, Flexopecten, Gigantopecten, Hinnites, Korobkovia, Manupecten, Palliolum, Pecten, and Pseu- damussium) and three subfamilies (Chalmydinae, Palliolinae, and Pectininae) have been identified. This number of species is higher than previously reported for the same area. Additionally, the phylogenetic classification fol- lowed in this paper modifies the species attributions formerly used. Key words: Pectinidae, taxonomy, Pliocene, Almería, SE Spain. RESUMEN Se ha realizado un estudio taxonómico de los pectínidos (familia Pectinidae: Mollusca, Bivalvia) de los depósi- tos del Plioceno inferior y base del Plioceno medio que afloran en el Campo de Dalías, Cuenca de Almería-Ní- jar y Cuenca de Carboneras (provincia de Almería, SE de España). Se ha seguido la clasificación filogenética recientemente propuesta por Waller (2006a) para niveles supragenéricos. Se han identificado veintidós especies distribuidas en doce géneros (Aequipecten, Amusium, Chlamys, Flabellipecten, Flexopecten, Gigantopecten, Hin- nites, Korobkovia, Manupecten, Palliolum, Pecten y Pseudamussium) y tres subfamilias (Chalmydinae, Pallioli- nae y Pectininae). Este número de especies es mayor de lo que previamente se había registrado en esta misma área. Así mismo, la clasificación filogenética seguida en este trabajo modifica algunas de las atribuciones espe- cíficas anteriormente usadas. Palabras claves: Pectinidae, taxonomía, Plioceno, Almería, SE de España. INTRODUCTION From a palaeontological perspective, the oldest occur- rence of a member of the family is Early Triassic (New- The family Pectinidae is the most diversified one of the ell & Boyd, 1995) and the group is recorded continuously pectinoideans in present-day oceans; it contains about 300 onwards to the present. The presence of a mostly calcitic extant species in approximately 60 genera (Waller, 2006a). shell gives the pectinids a high fossilization potential re- The family is well represented in modern oceans and in- sulting in this group of marine bivalves being one of the cludes representatives adapted to many different habitats best represented in the fossil record. This circumstance and modes of life. has promoted a wealth of papers dealing with the use of 2 JIMÉNEZ, AGUIRRE and RIVAS pectinids in biostratigraphy, palaeoecology, and evolution. pectinids. Therefore, in this paper, we present an updated Although the supraspecific taxonomy of the group is un- taxonomic revision of the species of the family Pectinidae der revision (see below), all these studies rely on relatively in Almería Pliocene deposits made upon a rather accurate well-established species taxonomy. sampling with more precise stratigraphic and palaeogeo- Pectinids are among the major constituents of the ma- graphic frameworks. The data presented herein will add rine invertebrate assemblages of the Pliocene deposits in information to the pectinid species richness and the palaeo- the province of Almería (SE Spain). The relative impor- geographic distribution of species in the Iberian Peninsula. tance of this group is enhanced because of the dissolution of most of the aragonite shells. They occur dispersed in the sediments as well as forming dense concentrations, both LOCATION AND GEOLOGICAL SETTING as the major components in factory deposits of carbonate platforms and in storm-bed deposits (Aguirre et al., 1996; The studied materials crop out widely in the Campo de Aguirre, 1998; Martín et al., 2004; Braga et al., 2006). In Dalías or Poniente Almeriense, in the Almería-Níjar Basin addition to these particular pectinid-dominated deposits, and in the Carboneras Basin (Fig. 1). In the former, the in the Almería-Níjar Basin, Amusium cristatum (Bronn, Pliocene deposits are exposed in a mapped band south of 1827) forms paucispecific beds of a few centimetres thick Sierra de Gádor, between Adra and El Sabinar (Fig. 1a). (5-10 cm) that can be laterally followed for hundreds of In the Almería-Níjar Basin, the Pliocene deposits crop out metres where individuals are densely concentrated (hun- widely in an area surrounded by Sierra de Gádor to the dreds of individuals) (Aguirre et al., 1996). Some of these west, Sierra Alhamilla and Sierra Cabrera to the north, and beds can be interpreted as shell-lag storm deposits, where by the volcanic province of Cabo de Gata to the east (Fig. specimens of A. cristatum show clear signals of rework- 1b). In the Carboneras Basin, the Pliocene sediments oc- ing, such as high values of disarticulation, fragmentation cur north of the Cabo de Gata-Serrata de Níjar (Fig. 1b). and abrasion. In other cases, this species forms concentra- Both in the Campo de Dalías and Almería-Níjar Basin, tions consisting of articulated and complete individuals, the Pliocene deposits can be divided into two unconforma- indicating absence of reworking. Therefore, these concen- ble units. The lower one (the subject of this study) consists trations are interpreted as biological accumulations (sensu of marls, silts, sands, conglomerates, and calcarenites-cal- Kidwell et al., 1986). cirudites. This unit ranges in age from the early Pliocene To better determine the taxonomic composition of the in the lower part to the early middle Pliocene at the top pectinid assemblages of these deposits, Méndez-Cecilia (Aguirre, 1998). The upper unit crops out only locally in (1971) carried out a preliminary study of species in differ- the Campo de Dalías but extensively in the Almería-Níjar ent outcrops of the province of Almería based on material Basin and is mostly composed of silts, sands, and con- collected by students. She identified 16 species and 3 va- glomerates. In the Almería-Níjar Basin, these terrigenous rieties, one of which was a new variety (Chlamys clavata deposits intercalate bioconstructions formed by the scler- var. almeriense Méndez-Cecilia, 1971). Apart from this actinian coral Cladocora caespitosa Linne 1776 (Aguirre taxonomic work, Demarq (1990) summarised the Neogene & Jiménez, 1997, 1998; Aguirre, 1998). pectinids of the Betic Cordillera in a taxonomic list. Later, In the Carboneras Basin, the Pliocene sediments are Aguirre et al. (1996) performed a palaeoecological study represented only by the lower unit, which consists most- on the relationship between pectinid assemblages and the ly of calcarenites-calcirudites with sands and conglomer- facies in which they occur in the Campo de Dalías and ates in the upper part (Aguirre, 1998; Braga et al., 2003a; Almería-Níjar Basin. These authors provided the taxo- Martín et al., 2004). nomic composition and the relative abundance of pectinid The stratigraphy, facies analysis and interpretation, species (Aguirre et al., 1996). taphonomy of marine invertebrate fossil assemblages, and The generic attribution of many species, as well as the the palaeogeographic context of the lower Pliocene depos- criteria for species identification, has changed since the its in the selected areas have been studied elsewhere (Mon- taxonomic study of Méndez-Cecilia (1971). Further, the tenat et al., 1990; Boorsma, 1992; Aguirre et al., 1996, recent developments of pectinid taxonomy, based both on 2002; Aguirre, 1996, 1998; Braga et al., 2003a, 2003b, molecular and anatomical data, has introduced a new in- 2006; Martín et al., 2003, 2004). Therefore, in this study sight to and obliged us to revise our previous accounts of we focus on the taxonomy of the pectinid species. Figure 1. Geological maps of the Campo de Dalías area, Almería-Níjar Basin, and Carboneras Basin with indication of the sampled localities (modified from Aguirre, 1998). a, Campo de Dalías area: 1.- Balanegra; 2.- Balerma; 3.- Matagorda-El Sabinar. b, Almería-Níjar and Carboneras Basins: 1.- Pechina; 2.- Polígono Industrial; 3.- Palmo de Salas; 4.- Los Juanorros; 5.- Cuevas de los Medinas; 6.- Lomillas de Juan Úbeda; 7.- Rambla de la Sepultura; 8.- Rambla Quebrada; 9.- El Argamasón- Los Ranchos; 10.- El Barranquete; 11.- Carboneras. SCALLOPS FROM PLIOCENE DEPOSITS OF ALMERÍA 3 4 JIMÉNEZ, AGUIRRE and RIVAS MATERIALS AND METHODS The same problem applies to the pectinid genera and the generic attribution of many species (Waller, 2006a, The taxonomy of pectinids of the lower unit in the 2006b). The status of many genera is still uncertain and Campo de Dalías, Almería-Níjar
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