Gelidium bipectinatum is a type of marine organism. G. bipectinatum is in the Gelidium Genus and Gelidiaceae Family, the Gelidiales Order. It can be further characterized as in the Rhodymeniophycidae Subclass in the Florideophyceae Class. It forms part of the Eurhodophytina Subdivision, which is part of the Rhodophyta Phylum that is in the Plantae Kingdom. This organism is a type of red alga.

Gelidium bipectinatum is an agarophyte, produces hydrocolloid agar in its cell walls, is a multicellular thallus with apical growth, has tetrasporangia, has a filamentous gonimoblast, has pit connections, cells have multiple nuclei and plastids, triphasic alternation of generations life history, eukaryotic cells without flagella and centrioles. It has floridean polysaccharides as food reserves, phycobiliproteins as accessory red pigments, chloroplasts lacking external endoplasmic reticulum and containing unstacked thylakoids, multicellular organisms, have a cell wall made of cellulose. The energy is typically obtained from sun with chlorophyll. It reproduces by sexual or asexual reproduction, modular and indeterminate growth, alternation of generations.