Seaweeds are well known for having a wealth of nutritional benefits and providing ecological support to associated fauna. Seasonality influences the biochemical characteristics, affecting their ecological and economic values. In the present study, we evaluated pigments, primary and secondary metabolites, minerals, and antioxidant properties of green seaweed Chaetomorpha antennina growing on the intertidal rocks along the Covelong coast, India, in different seasons (from June 2019 to March 2020). Significant variations were found in the levels of antioxidants, minerals, and metabolites in different seasons, e.g., amino acid levels were the highest in post-monsoon and the lowest in summer. In monsoon, we found the highest concentration of fatty acids in the thalli. Lipid peroxidation and total antioxidant activity were at their maximum levels during post-monsoon, which indicated oxidative damage responses. No significant variations were found in the levels of photosynthetic pigments. The outcomes indeed suggested seasonal variations in the biochemical and nutrient profile of C. antennina. We suggest that the harvesting/collection of C. antennina for different nutrients and metabolites should be performed in the respective seasons.

A new species of marine amphipod, Protohyale covelongensis sp. nov., is described from India. The taxon is fully described and illustrated with which it could be easily identified morphologically. Protohyale covelongensis sp. nov. has a specific shape of the basis of pereopod 7 in the mature male, forming a distinct axe-shaped flange on its anterior margin. This characteristic feature serves to distinguish it from other Indian hyalid species. This new species is also compared with known species with which it could be confused. We have performed molecular phylogeny based on the mitochondrial gene cytochrome c oxidase subunit I.