Microfósiles La sistemática forma la base de la Taxonomía (ordenación), se usa para clasificar, agrupar y ordenar el conjunto de seres vivos del pasado. Además es la ciencia que se encarga de llevar a cabo el estudio de las relaciones de parentesco (afinidades) que se producen en las distintas especies. Sistemática
Terminación
Reino
-
Phylum
-
Clase
-
Orden
IDA
Suborden
IINA
Superfamilia
CEA
Familia
DAE
Subfamilia
NAE
Género
-
Especie
-
Microfósiles Calcáreos FORAMINIFEROS
COCOLITOFÓRIDOS COCOLITOFÓRIDOS
OSTRACODOS
Poseen esqueleto calcáreo (CaCO3)
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Los Foraminíferos Foraminíferos
El elemento principal para diferenciar un foraminífero es la concha. La concha refleja un conjunto de caracteres funcionales del organismo vivo y ayuda a comprender el éxito de ciertos foraminíferos en determinados ambientes y también sus tendencias evolutivas a lo largo de la historia de la vida. Tienen importancia como formadores de rocas y a la hora de elaborar escalas temporales. Los foraminíferos son organismos constituidos por una única célula, que aparecieron a principios de la Era Primaria (Cámbrico).
Sistemática Reino
PROTISTA
Phylum
SARCODINA
Clase
RHIZOPODA
Orden
FORAMINIFERIDA
Tipos de conchas: Aglutinada: Concha formada con partículas unidas por cemento secretado por el organismo.
Las partículas que toma del medio mediante los pseudópodos pueden ser solo cuarzo (pared arenácea), o también restos orgánicos o inorgánicos del fondo. El cemento puede ser orgánico, silíceo, calcáreo y en raras ocasiones ferruginoso. Se caracteriza por paredes gruesas y color café rojizo.
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Hialina : Concha formada por micro cristales de calcita mediante un proceso de
biomineralización (in situ). Aspecto transparente y vítrea (pared fina), o Blanca translucida (pared gruesa). Presenta perforaciones en la concha.
Aporcelanada Aporcelanada : Formada por micro cristales de calcita de muy pequeño tamaño (0-1,2 u).
Blancas por reflexión y negras en transparencia. Tienen un aspecto aporcelanado. La pared es imperforada.
Miolalacea
Microgranular: se caracteriza por conchas gruesas, cuya pared está formada por pequeños
granos de calcita unidos por cemento calcáreo microcristalino. Característico de la Superfamilia Fusulinacea.
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Reconocimiento de un Microfósil
A. Testa Exterior B. Vista Axial C. Vista Ecuatorial
Arquitectura (“Bauplan”) (“Bauplan”) La unidad básica de construcción de las l as testas de los foraminíferos consiste en una cavidad rodeada por una pared llamada cámara. Aunque unas pocas especies constan de una única cámara, la mayor parte de las especies está formada por varias cámaras ( multicamerales multicamerales). ). Los arreglos multicamerales más simples se constituyen por una serie lineal de cámaras, formando una testa uniserial . Internamente las cámaras son separadas por tabiques llamados septos. Además de las testas uniserial , son comunes las biseriales , con dos series de cámaras y las triseriales , triseriales , con tres series de cámaras (Figura 2a). También, en lugar de formar series rectas de cámaras, algunos foraminíferos forman testas enrolladas. Si ambos lados de la testa lucen planiespiral l (Figura 3c). Si la testa se enrolla en una idénticos, el enrollamiento se denomina planiespira espiral, como un caracol, las dos caras de la testa tendrán aspectos diferentes (en muchos casos, una más prominente; que será el lado espiral, de aspecto evoluto y el contrario con una pequeña depresión; el umbilical que será involuto). El enrollamiento será entonces trocoespiral (Figura 2c)
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Naturaleza de las las paredes de los foraminíferos. Bignot, foraminíferos. Bignot, Los Microfósiles, 1988.
Figura 1: Aspectos estructurales de las pareces de las testas de foraminíferos.
a. Pared aglutinada. Los campos oscuros representan a partículas de material aglutinado el cemento (tesel as sin sombrear). b. Pared porcelanacea. Notar como los ejes cristalográficos de las partículas que conforman la pared poseen una orientación aleatoria, lo que impide la conducción de la luz a través de ésta y produciendo reflectancia. c. Pared hialina fibrosa-radiada, donde no se han configurado los poros. Presenta un aspecto levemente traslúcido d. Pared hialina granular. Traslúcida, dada la presencia de cristales únicos a través de su espesor, que permiten la conducción de la luz.
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Figura 2 : Disposición de las cámaras de los foraminíferos. Boardman, Cheetham y Rowell. Fossil Invertebrates, 1987
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Textulariina
Periodo: Cámbrico Inferior – Holoceno Pared: Aglutinada Bauplan: Trocoespiral, biserial a triserial (algunas veces uniserial en el inicio), multilocular
Testa externa
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Orbitolinidae (Orbitolina)
Testa cónica, compuesta de numerosas cámaras subdivididas parcialmente por particiones radiales o transversales, o con pilares entre septos. Periodo: Cámbrico Inferior – Holoceno Pared: aglutinada Bauplan: Uniserial, Trocoespiral, multilocular
Testa externa
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Fusuliniina Fusuliniina (Fusulina)
Testa enrollada, con numerosas cámaras por espira, puede ser discoidal, esférica, fusiforme algunas veces, pero comúnmente es subcilíndrica. Edad: silúricosilúrico - pérmico Bauplan: Planiespiral fusiforme. Pared: microgranular
Testa externa
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Miliolinidae (Miliola)
Testa fusiforme, angosta y elongada. Abertura terminal en el final de la cámara. Periodo: Eoceno medio - Oligoceno Pared: Aporcelanada Bauplan: Fusiforme, planiespiral, quinqueloculina (5 cámaras), triloculina (3 cámaras), biloculina (2 cámaras).
Testa externa
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Alveolinidae Alveolinidae (Alveolina) (Alveolina)
Testa usualmente grande enrollada alrededor de ejes alargados y posee cámaras numerosas divididas en cámaras tabulares por medio de particiones secundarias. Edad: Cretácico Inferior hasta Holoceno Pared: Porcelanacea Bauplan: planiespiral y son fusiforme en estado adulto.
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Nodosaria
Testa elongada con un prolóculo ovalado seguido por cámaras globulares a ovaladas; abertura terminal radial o redondeada y bordeada por ranuras radiales. Periodo: Carbonífero - Holoceno. Pared: Hialina. Bauplan: Uniserial rectilínea, multilocular.
Testa externa
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Lenticulina
Planiespiral involuta de 7 a 12 cámaras de sección triangular. Su última vuelta es más ancha que alta. Posee una abertura radiada y localizada en el ángulo periférico de la última cámara. Periferia carenada. Pared: Hialina Periodo: Carbonífero – Holoceno Bauplan: Planiespiral, multilocular, uniserial.
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Lagenidae (Lagena)
Testa unilocular, globular a ovalada, superficie con estrías longitudinales; abertura terminal redondeada, producida en un largo o corto cuello similar al de una botella. Periodo: Jurasico - Holoceno. Pared: Hialina (Calcita radial, monolaminar) Bauplan: Unilocular
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Orbitoides
Conchilla discoidal a lenticular, cámaras ecuatoriales y laterales diferenciadas. Periodo: Cretácico tardío – holoceno tardío. Pared: hialina. Bauplan: unilocular, lenticular.
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Lepidorbitoides
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Siderolites
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Nummulitidae
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Hantkeninacea Hantkeninacea (hantkenina)
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Globigerinidae Globigerinidae (Globigerina) (Globigerina)
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Globigerinidae Globigerinidae (Orbulina)
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Globorotaliidae Globorotaliidae (Globorotalia) (Globorotalia)
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Globotruncanidae Globotruncanidae (Globotruncana)
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Heterohelix Caparazón más ancho que largo, el cual aumenta rápidamente en forma de cono achatado con la mayor anchura hacia la parte final donde se encuentra la abertura. Las cámaras son infladas, casi esféricas y aumentan considerablemente de tamaño hacia el final del caparazón.
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Calpionellida El orden Calpionellida está caracterizado por un cuerpo cónico o en forma de “trompeta
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