Am I correct in thinking that C depicts a seed? If so, seeds that are 1mm long sounds awfully big for an Aztekium seed.
Well, seeds have been described as having a maximal height / width of 0.69 mm. The drawing is probably a bit out of scale, but main thing is it shows the seed's structure and overly massive dome.
Interesting point, I see a Latin diagnosis is given on page 7 following a similar English description on page 6,
There is no Latin diagnosis, the English diagnosis precedes a description in Spanish, as the entire original article is. I would say the English description will take priority... but we didn't really put thoughts in this. We made no alteration to the Spanish original version, it was published as supplied. The English version was also checked and approved by the authors.