Millerichthys (Costa 1995)

The Cynolebiatinae. Systematics and biogeography of the neotropical annual fish subfamily (Cyprinodontiformes: Rivulidae). 1995: 1-128

Millerichthys robustus (Miller &  Hubbs, 1974)

Rivulus robustus, a new Cyprinodontid Fish from Southeastern Mexico. Copeia: 865, figs. 1-3.

Info 

Dominguez O.C., M.A.C., Mosqueda S. Valdesalici, 2013. First Observations of Annualism in Millerichthys robustus (Cyprinodontiformes: Rivulidae).  Info:

Millerichthys robustus (photo)  survives in ephemeral pond habitats from Papaloapan river basin in Mexico by producing drought-tolerant diapausing embryos. Four stages in fertilized embryos were observed: Dispersion/re-aggregation, Diapause I, Diapause II, and Diapause III confirming its annualism. Eggs extracted from soil when the pool was completely dry were found in Diapause I. The chorion surface ornamentation is reported for this species for the first time.