Primer registro de Palicus alternatus Rathbun, 1897 (Decapoda: Brachyura), para Cuba

A new species of ocellated Xanthias Rathbun, 1897 (Crustacea: Decapoda: Brachyura: Xanthidae) from the Bohol Sea, Philippines.

A new species of xanthid crab (Brachyura: Xanthidae) is described from the Bohol Sea in the central Philippines. Xanthias joanneae sp. nov. is most similar in morphology to X. maculatus Sakai, 1961 (type locality: Sagami Bay, Japan), particularly in the presence of distinctive ocelli on the carapace and pereopods. It can be separated from this species by the greater number of ocelli on the dors...

Histological and histochemical analysis of the gonadal development of males and females of Armases rubripes (Rathbun 1897) (Crustacea, Brachyura, Sesarmidae).

The objective of this study was to provide information on the histological characteristics of the gonads of male and female Armases rubripes crabs, and to try to establish a relationship between the microscopic and macroscopic stages previously identified. Thirty-six crabs were collected by hand between February 2003 and January 2004 in banks of Spartina alterniflora on Sahy Beach in Mangaratib...

An unexpected record of an African mangrove crab, Perisesarma alberti Rathbun, 1921, (Decapoda: Brachyura: Sesarmidae) in European waters

Background: Finding of a single female specimen of the African mangrove crab Perisesarma alberti Rathbun, Bull Am Mus Nat Hist 43: 379–474, 1921, in the intertidal zone of the eastern part of the Bay of Seine, English Channel, France. Result: Identification and description of the recorded crab, photographs and measurements of the single specimen. Comparison with reports from West African mangro...

The Taxonomy of Sesarma tangi Rathbun, 1931 and S. stormi De Man, 1895 (Crustacea: Decapoda: Brachyura: Grapsidae: Sesarminae), with Establishment of a New Genus for S. stormi

Sistema para la medición, visualización y registro de la radiación solar

Sunlight is essential for life, moderate exposure to ultraviolet radiation contributes to the synthesis of vitamin D, but much exposure can be harmful to skin, eyes and immune system. One of the biggest problems when exposed to the sun is skin cancer. In Mexico, around 1,000 cases occur annually; the states with the highest record of cancer deaths are: Mexico City, Mexico State, Veracruz y