Observations are essential to explore and discover the ocean. The rapid advancements in technology have revolutionized our capacity to document the ocean and its diverse array of species, pushing the boundaries of our understanding further than ever before.

Vertical distribution, sex ratio, size structure and mate encounters of Firoloida desmarestia in the southern Gulf of Mexico were analyzed during four seasons (February, May, August and November). A total of 395 individuals were collected with an opening-closing

Chromosome number and morphology were studied in gonadal tissue of 11 species of Atlantidae, 2 species of Carinariidae, and 3 species of Pterotracheidae, using an air-drying technique and Giemsa staining. In the Atlantidae the diploid chromosome number