Unless I am missing something, it doesn't appear that it is a case of incomplete dominance either. Incomplete dominance should also display three phenotypes, although differently than codominance. The common example of incomplete dominance is in four o'clock flowers. The homozygous recessive genotype is expressed as a white flower while the homozygous dominant form is expressed as a red flower. The heterozygous condition is an intermediate, being expressed as a pink phenotype. This is because in the homozygous recessive condition (cc) a protein is not produced for color (no pigment = white color) and the homozygous dominant condition (CC) (both alleles code for red pigment production= red color). The intermediate heterozygote (Cc) only has one allele coding for red pigment production (C) while the recessive allele (c) codes for no production and you get a pink coloration. As there doesn't seem to be an intermediate phenotype in catenifer, I think that this is likely not a case of incomplete dominance.

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