Echinoderms are marine organisms that belong to phylum Echinodermata. These organisms are characterized by tube free (tentacle-like structures), radial symmetry, and endoskeleton, which is made up of calcium carbonate.
Echinoderms have non-segmented bodies, means they are asegmented organisms.
Psychrotrophs are those bacteria which can tolerate cold temperature and have optimum growth above 15 degree Celsius.
Halophiles prefer high salt concentration.
Mesophiles prefer temperatures with a average of 37 degree Celsius.
Anaerobes grow in absence of oxygen.
In the given experiment, none of the bacterial cultures were placed in saline or anaerobic conditions. So, the bacterial species is not an anaerobe or halophile.
Again the cultures did not show growth at 37 degree celsius so they are not mesophiles.
Maximum growth at 22 degree celsius and a little growth in refrigerator make it obvious that the species is a Psychrotroph.
