Academic literature on the topic 'Revillagigedo Archipelago'

The Galapagos slipper lobster Scyllarides astori was found for the first time off western Mexico mainland. A male and two female specimens were collected in south Jalisco and north Colima. This represents a new record from central Pacific coast of Mexico and a range extension of 700 km southwards, as the species was previously reported from the Gulf of California, 780 km eastwards from Revillagigedo Archipelago and 2400 km northwestwards from Isla del Coco and Galapagos Archipelago.

Diecienueve especies de psócidos fueron registrados en Isla Socorro, con una superficie de 167 km^, y a 704 km al oeste de Manzanillo, Colima, México, y seis especies de psócidos fueron registrados en Isla Clarión, con una superficie de 25 km^ y a 372 km al oeste de Isla Socorro y a 1076 km al oeste de Manzanillo. Todas las especies de Clarión, excepto dos, se encuentran también en Socorro. Sólo dos de las 21 especies de ambas islas son endémicas: una de ellas se encuentra en ambas islas y la otra se encuentra sólo en Clarión; ambas son del género Cerobasis. la mayoría de las especies no endémicas se han registrado en la costa del Pacífico de México, al este de las islas. Siete de las 21 especies de las Islas Revillagigedo se encuentran también en las Islas Marías, y 13 de ellas se encuentran también en la costa del Pacífico de México, para dar un indice de similitud faunística de 0.19 con ambas áreas. la fauna de psócidos de las Islas Revillagigedo, constituye una extensión empobrecida de la fauna de psócidos de la costa del Pacífico de México, explicable por la distancia de la costa a las islas, y por el área reducida de éstas.

Two new species of the genera Eugorgia and Leptogorgia were discovered while underwater collecting at the Revillagigedo Archipelago, Mexico. Sea fan species diversity and density population in these four volcanic islands is low (<12 spp.), and the possibility of endemism is high given their isolation from the mainland (403 km southwest of Cabo San Lucas, Baja California peninsula). Morphological features suggest Eugorgia wilkiei sp. nov. has a close relationship to species of the daniana group, particularly with Eugorgia multifida Verrill, 1870. However, E. wilkiei sp. nov. has densely branched irregular-pinnate colonies that grow in several simple planes or multiplanar flabelliform, and shows two distinct chromotypes (yellow or red). Leptogorgia waltonae sp. nov. is added here to the ena group because its similar in size and sclerites to Leptogorgia ena Breedy et al. 2012. However, the wart-like terminal twigs representing an enlargement of the axis (but not the coenenchyme which has the same thickness throughout the colony), 90°-angled lateral branching, and the red, purple, orange, or yellow coloration range of the colonies are the main taxonomic characters to distinguish L. waltonae sp. nov. from L. ena. Scuba diving observations in about 200 sampling locations done since 1995 to 2016 along the mexican Pacific coast, including the Gulf of California, indicate both new octocoral species are distributed only at Revillagigedo islands. Revillagigedo Archipelago is surrounded by oligotrophic oceanic waters, strong seawater currents, and relatively frequent hurricane perturbations that favor small or robust, and hard and resistant sea fan colonies, low-species diversity, and low-population density. These factors may enhance speciation processes supporting the comparatively high endemism of the islands benthic fauna as well.