Polyphyletic: Refers to a group of species that do not have one common ancestor species.
Population Density: Number of individuals per unit area or volume.
Porifera: The phylum comprising the sponges.
In phylogenetic analysis (Lehtonen 2006; Lehtonen & Myllys 2008) Echinodorus was found to be polyphyletic [=the last common ancestor is not included in the genus] and in order to obtain a monophyletic [=a clade (here genus) consisting of the last ...
The genus itself is poorly defined and polyphyletic. Many species have been reallocated to other genera such as Bujurquina, Laetacara, Tahuantinsuyoa (Kullander, 1986), Krobia and Cleithracara (Kullander & Nijssen, 1989).
 See also: Fish, Species, Family, Water, Genus
  
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