What is a nitripervalida? To be a true nitripervalida, a specimen needs to have/had a proboscis, be made of metal, and be used to open some sort of container while being provided by such container. If any one of these essential qualities are missing, your specimen is not a nitripervalida.
ANATOMY

Families with…
Thumb Hole: Duforaminidae, Quadratforaminidae(most times), and Nullforaminidae. Created by mutations that were selectively bred to be more and more extreme.
Body: All
Secondary Hole: Duforaminidae and Quadratforaminidae(most, if not all times).
Proboscis: Depends on specimen quality, they all had one at one point. Used to eat the contents of the host or the host’s metal itself.
Rostrum: Depends on specimen quality, they all had one at one point.
Slip: Only Magncacuminidae
Chip: Occasionally there will be a small dent at the bottom of the body of a Nitripervalida. That is called a chip. So far only been seen in Duforaminidae.
Nib: Not shown on diagram. Can be found on various types of families. A Nib is created when the metal on the back of the nitripervalida is bent in a way that makes it visible from the front. Almost like a reverse chip, but not quite.


The Chip is circled. Photo taken by Jai, a fellow tabist.
Nitripervalida Proboscis Diagram

OFFICIAL SIZING CHART
PHYLOGENY

RIVET CLASSIFICATION SYSTEM
(credit to my friend jai for proposing the system)

Full: Classified by having both a rivet and a rivet island. Found rarely on pull tabs.
Partial: Classified by having a rivet island but no rivet. Found rarely on pull tabs.
Sub-Partial: Classified by having a rivet island that is barely holding on. Very unusual and rare to see.
None: Classified by having no rivet and no rivet island. Found on most pull tabs.
Old vocabulary:

