T. numidicus is interesting in that I am uncertain whether or not it is regarded as a valid species. Longhurst regarded it as synonym for T. granarius. In recent papers I have seen it referred to both as a valid species and as an outdated name for T. granarius. Unfortunately, references to it are all that exist to my knowledge and I have yet to find a paper defining it as a species or its characteristics.
Triops numidicus (strongly thought to be T. granarius
Unknown (assumedly identical to T. granarius)
Large size in wild specimens (typically 4-5 inches long)