Sphacelaria rigidula is a species of brown algae in the family Sphacelariaceae. They are native to Pernambuco, Bahia, Santa Catarina, Ceará, ParaíBa, Espirito Santo, Rio De Janeiro, and SãO Paulo.
Definition: number of homologous sets of chromosomes in the nucleus or primary chromosome-containing compartment of the cell, each set essentially coding for all the biological traits of the organism.
Definition: A group of species that exploit the same food resources, and/or use the same feeding or foraging methods. http://en.wikipedia.org/wiki/Guild_(ecology)