cylindrica at three spatial distances from each other resulted in different responses in growth and morphology. Growth in P. cylindrica was directed towards the increase in the number of branches and growth in A.
Morphology based on fishbase.org...
Dorsal spines (total), 5 - 7
Dorsal soft rays (total), 6 - 8
Anal soft rays, 6 - 8 ...
Morphology that resembles macropodia. Strong polypless base column splits itself into two or more secondary columns from which long finger like branches protrude. These branches can divide again.
Were I a scientist, I think > I'd be a lumper (based on the morphology of the fish, which is all I > know how to look at). Me too, for the most part. That's the difference between us hobbyists and professional taxonomists.
Nonetheless, most species known have been described solely from morphology. Biological / Isolation species A set of actually or potentially interbreeding populations.
Many of the species are very similar in appearance, with only slight variations in colour or morphology making them possible to tell apart, although these similar species often come originally from different localitlies.
is most common there is a strain of male that is significantly different in morphology from the bourgeois males. This strain has some specific differences that make it identifiable.
The members of this family are diverse in size, morphology and diet. Cichlids are some of the most celebrated freshwater aquarium fish in the hobby today.
Firstly, the fish have apparently identical morphology. Secondly, both fish originate from - albeit different parts of - the vast reaches of South America's Rio Orinoco.
This species is not a true Geophagine as it lacks all of the specialized gill morphology that characterizes that group.
O.B.: An abbreviation for Orange-Blotched, which refers to a fish with an orange-blotched or spotted morphology. See Orange-Blotched.
O.D.: An abbreviation for outside diameter, used when measuring tubing dimensions.
As for B. foerschi and B. strohi, I do think they are probably distinct species, based not only on morphology but on coloration, size and behavior.
A study of Daphnia retrocurva reproduction - quite interesting as it details the influence of enviromental factors and predators on Daphnid morphology.
Besides that, new unidentified species, regional varieties and color forms are discovered, and new and/or updated research data (concerning DNA, parasites, morphology etc.) is published on a fairly regular basis.
 See also: Morph, Species, Fish, Water, Aquarium
  
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