SPONGE-INHABITING BARNACLES OF THE AMERICAS: A NEW SPECIES OF ACASTA (CIRRIPEDIA, ARCHAEOBALANIDAE), FIRST RECORD FROM THE EASTERN PACIFIC, INCLUDING DISCUSSION OF THE EVOLUTION OF CIRRAL MORPHOLOGY

in Crustaceana
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Abstract

Se describe Acasta newmani n. sp. del Golfo de California. Esta es la primera cita de Acasta en el Pacofico oriental. Se discuten las hip otesis sobre la correlacion entre morfologoa cirral y los metodos de alimentacion y especificidad de huespedes. Las similitudes, entre A. newmani y A. cyathus Darwin, 1854 indican que son un ejemplo del patron comun entre especies hermanas a ambos lados del istmo de Panama, en el Caribe y Pacofico oriental tropical. Se incluye una clave de las siete especies americanas de cirropedos que viven en esponjas, indicando la especie huesped y sus distribuciones. El rango de distribucion de Membranobalanus nebrias (Zullo & Beach, 1973) se extiende desde las islas Gal apagos hasta el Golfo de California. Acasta newmani n. sp. from the Gulf of California, Mexico is described. This is the first report of Acasta from the eastern Pacific. Hypotheses are discussed concerning the correlation of cirral morphology with feeding methods and host specificity. The similarities between A. newmani and Acasta cyathus Darwin, 1854 indicate that they are examples of the common pattern of trans-isthmian sibling taxa in the Caribbean and eastern tropical Pacific. A key to the seven sponge-inhabiting barnacle species of the Americas is presented with citations noting their host sponge species and known ranges in the Americas. The range of Membranobalanus nebrias (Zullo & Beach, 1973) is extended from the Galapagos Islands to the Gulf of California.

SPONGE-INHABITING BARNACLES OF THE AMERICAS: A NEW SPECIES OF ACASTA (CIRRIPEDIA, ARCHAEOBALANIDAE), FIRST RECORD FROM THE EASTERN PACIFIC, INCLUDING DISCUSSION OF THE EVOLUTION OF CIRRAL MORPHOLOGY

in Crustaceana

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