First survey of Interstitial molluscs from Cayo Nuevo, Campeche Bank, Gulf of Mexico.

Six sediment samples weighing between 224-735 g were collected in June of 2016 from Cayo Nuevo reef, located at the Campeche Bank, southern Gulf of Mexico. Samples were collected by SCUBA diving, from were two stations at depths of 7.6 and 18.

Chitons (Mollusca, Polyplacophora) from Alacranes Reef, Yucatan, Mexico.

This study represents the first comprehensive chiton study from Alacranes Reef, the largest reef system in the Gulf of Mexico. Nine chiton species were found in seven localities within the area, in the intertidal and subtidal to 12 m depth. SEM examination of , , and , showed variations in the sculpture and radular teeth morphology when compared to specimens of the same species from Florida Keys, Bahamas and Puerto Rico.