[5] C. erythrurus may bear a humeral spot somewhat similar to that of C. spilogyros, but it is less conspicuous, and also has a notch on the upper side.

[3] C. spilogyros may have a lateral stripe on some occasions (likely relating to the mating cycle), but it is much broader and less distinct than those of C. epakros and C.

[4] C. spilogyros also has a fontanel (soft, membranous spot) between the frontal and parietal bones of the head to further differentiate it from C. epakros and C. guaporensis, which have none.

[7] In specimens more than 12 cm (4.7 in) in length, the head is more robust in comparison to the body, suggesting that this size may be the point of some kind of maturation.

[16] As of 2022, C. spilogyros is considered a species of least concern by the International Union for the Conservation of Nature (IUCN).

Other members of the genus have been observed to largely be insectivores, taking occasional plant material as well.

[17][18] The study of behavior is much the same; the pinktail and yellowfin chalceus in particular have been observed to be active, fast-moving, and somewhat skittish.