NCG (Nitripervalida Collection Group)
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nitripervalidae.bsky.social
NCG (Nitripervalida Collection Group)
@nitripervalidae.bsky.social
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Taxonomising, Researching, and Collecting the world's Nitripervalidae — Can Tabs, Ring Pulls, Goupilles, Anillas, etc.

Nitri News + Updates, Identification, and other miscellaneous Nitripervalidology-adjacent content

Find more @
http://thefoxxo.com/ncg/
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nitripervalidae.bsky.social
It's a common misconception that Ring Pull style tabs are largely extinct in the modern age — this isn't the case!

Watch out for migrant and imported species, as these are still widespread throughout Asia and the Middle East, which are key records.

(Undescribed specimen, collected in the UK, 2025)
A modern tear off ring-pull style tab, with some signs of wear through scratches and light dents. A 1cm scale on the left shows that it is roughly 4cm tall from the top of the tab to the very bottom of the torn metal from the can.
January 27, 2025 at 10:11 PM
nitripervalidae.bsky.social
Only 5 more days!

Happy holidays from everybody at the NCG ❄️
A christmas tree, constructed of images of various coloured can tabs, overlaid against a light blue background. A large yellow tab at the top indicates a star, a larger orange tab at the bottom the tree's trunk, a triangular arrangement of green tabs for the tree's needles, and a variety of smaller blue, silver, yellow, and orange tabs for ornaments littered across the tree.
December 20, 2024 at 7:35 PM
nitripervalidae.bsky.social
Tough question! Not sure about impressive, but my four picks would probably be these:

(Some info as well as image descriptions in ALT Text)
Family Unumforaminis Species: Globe rapientis A broad tab, with one large, rounded-square shaped Oral Groove (Hole). Its bottom features a large rivet attaching to the can, flanked on bith sides by embossed apostrophe-like shapes. Only found on pressurised containers of tennis balls Family: Duoforaminis Species: Quattuor foramina A typical larger can tab, found on tins of food. Its Primary Oral Groove (Top hole) is round with a flatter bottom, almost making it bean shaped. The Secondary Oral Groove (Bottom hole) is circular, with three smaller holes at 120° rotations around the circle from eachother, which would line up with the rivet structure attaching the can to the tab to create 3 complete circular holes. The Secondary Oral Groove is surrounded by an indent, almost shaped like an upside-down gumdrop. Family: Under debate, likely Unumforaminis Species: Tria foramina A peculiar Ring-Pull type can tab. It is broad, with a metal 'slip' taken from the can's top attached by the rivet, like other ring-pulls. Two small holes are found in the tab's body, on either side of the rivet. PHOTO CREDIT: VoyagerAnnelid Family: Unumforaminis Species: Metallicum widepueri A relatively cryptic tab, with very little information known outside of its basic existence. Not in any NCG or affiliated collection as far as I am currently aware. A slightly more modern pull-tab derived Nitri. It is particularly large, and very tall, with an absolutely giant Oral Groove. Its rivet is surrounded by a circular indent, flanked on both sides by thin indented lines, leading vertically towards the Oral Groove.
November 23, 2024 at 11:47 PM
nitripervalidae.bsky.social
See also:

1. The original patent for this style, U-Tab and all:
patents.google.com/patent/US322...

2. A spiral top in-situ, still attached to a can of Motor Oil, credit to the amazing Voyager Annelid! Only confirmed hosts so far are a Maple Syrup can and the afformentioned automotive product.
A can, with one of the U-Tabs and spiral tops of the previous reply, still attached flat against the can, with the text 'PAT PEND' debossed across the middle.
November 23, 2024 at 11:23 PM
nitripervalidae.bsky.social
If only the tab was still intact, though we could probably predict it to be a couple of different styles from around the late 50s - early 60s.

Pictured below are the common U-Tabs, and rarer on these, Pull-Tabs, courtesy of one of our friends in Canada!

Credit: u/CaleChipzz
A vintage can tab, pill shaped with no holes and a blunt end on its rivet side. It connects to a metal structure that extends off-screen, a spiral that runs all the way around the top of a can. Two more typical vintage Ring-Pull style tabs, also attached to removed can ends by an extended spiral. They are rusted, and laid against a white plastic bag.
November 23, 2024 at 11:19 PM
nitripervalidae.bsky.social
To find the Manufacturer of your can, check on the side, usually around the barcode. It will usually be signified by a small logo — Some common ones are listed below, with Manufacturer names in the ALT text.

*Please note, the can manufacturer will not always be the same as the lid manufacturer!*
Logo of a Crown viewed slightly from below, with dots across the circumference depicting jewels. Crown Holdings Cursive logo reading 'Ball', underlined from the bottom left. Ball Corporation Blue val with tapering sides, inside are the letters 'cp' Canpack Blue circle with a grey outline. Inside are the overlapping letters 'AG' Ardagh Group - Sometimes a variant with the letters 'AMP' shows up, denoting 'Ardagh Metal Packaging'
November 17, 2024 at 5:33 PM
nitripervalidae.bsky.social
Basic Terminology (2/2)
Drawing of a typical vintage Pull-Tab of the family Unumforaminis. It is named as 'Distillans c.f. habena'. It has one large, ovular Oral Groove. Features labelled are as follows: Slip - The large, thin metal extension that is removed from the can top when opened, attached by the Rivet. Rivet Island - At the bottom of the main body of the tab, attaching the tab to the rivet. Rivet - A small, circular piece of the can that joins to the Rivet Island, fixing it in place. Body - The main part of the tab, encompassing all but the slip. Oral Groove - The large hole in the tab, that is used by humans to grip and pull on the tab.
November 17, 2024 at 5:19 PM
nitripervalidae.bsky.social
Basic Terminology (1/2)
Drawings of two typical Stay-Tab Nitri — the ones found on most modern cans in the West. On the left is Attenuatis cyclopsos (Acutiforaminis) and on the right is Parvum foramen (Duoforaminis). Below them is a scale bar, measured in cm. The two are both labelled with some key terminology: Primary Oral Groove - Lines towards the main, top hole of the tabs Secondary Oral Groove - Lines towards the bottom holes on the tabs, which contain the rivet structure Rivet - Lines towards the small, circular pieces of metal that connect the host can to the Nitri, via the Rivet Island Rivet Island - Lines towards the structure inside of the Secondary Iral Groove that connects the Rivet to the Body Labelled only on Parvum foramen is: Body - Line towards the main metal structure of the tab. Obviously, every Nitri has a body, if it didn't there wouldn't be anything there. Does that mean that the whole universe is an Oral Groove without a body? Chip - Line towards an indent at the bottom of the tab, sometimes found on Duoforaminid, Figuraforaminid, and Opertoforaminid species. This common example is rectangular. While the Chip's purpose is unknown, it likely functions in the opening of a can.
November 17, 2024 at 4:06 PM
nitripervalidae.bsky.social
The NCG is a scientific group dedicated to the collection, classification, and research of Nitripervalidae (often known as can tabs, ring pulls, and a variety of other common names) — small, incredibly variable Microsyntherids, believed to be kleptoparasites, usually of food/bevarage packaging.
A light-blue Stay-Tab variant Nitri — Can tab — of the family Duoforaminis. The status of this particular specimen and others liek it has not yet been established, though it shares an identical resemblance to Parvum foramen. It has a mostly ovular Primary Oral Groove (Top Hole) and a semicircular Secondary Oral Groove (Bottom Hole). The two Oral Grooves are of the same width. The overall shape of the Nitri's body is quite typical, with flat sides and a rounded top and bottom. This specimen is unchipped, with a complete Rivet Structure present. Photo Credit: Envases The top of a large tin, with a large Duoforaminid Nitri attached. It has a round Primary Oral Groove and a blocky body. Photo Credit: Dreamstime.com A dry, beige-coloured coconut, with circular scores across its top. Within these is a large Nitri of thr family Unumforaminis. It has a thin body and a perfectly circular, large Primary Oral Groove. This specimen is one of a small number of Unumforaminids to have no slip — Scroll down the thread for definitions on any terminology if you are confused. Photo Credit: u/ObeseMorese
November 17, 2024 at 2:58 PM
nitripervalidae.bsky.social
📌 PINNED THREAD 🧵

For Info on:
• What we do
• Nitripervalida Taxonomy
• ID Guides
• Useful Resources
• How you can help

Click + Scroll!
Image of the NCG's Coat of Arms. A black shield with a yellow outline, containing a depiction of a generic Duoforaminid Nitri/Can Tab. To its top in yellow text are the letters 'NCG, and on the bottom in similarly yellow text reads the date '8-8-2024'. Within the top-left of the yellow border reads the word 'Nitripervalida'.
November 17, 2024 at 2:34 PM
nitripervalidae.bsky.social
Pain in the ass, only help I can give is an ID...

Parvum foramen (Family Duoforaminis), probably the most widespread species of the Western world
A silver Stay-Tab variant Nitri — Can tab — of the family Duoforaminis. It has a mostly ovular Primary Oral Groove (Top Hole) and a semicircular Secondary Oral Groove (Bottom Hole). The two Oral Grooves are of the same width. The overall shape of the Nitri's body is quite typical, with flat sides and a rounded top and bottom. This specimen is unchipped, with no Rivet Structure present.
November 16, 2024 at 9:00 PM
nitripervalidae.bsky.social
I have no idea what the heck kind of magic you're doing here, but I can identify your can tab there!

Parvum fabaforaminis, of the family Duoforaminis, making nice use of that distinctively wide Primary Oral Groove!
A typical modern 'Parvum fabaforaminis', a Stay-Tab variant of can tab, with a rounded Secondary Oral Groove (Bottom Hole) and particularly wide and bean-shaped Primary Oral Groove (Top Hole). Photo Credit: Voyager Annelid
November 16, 2024 at 4:35 PM
nitripervalidae.bsky.social
‼️WANTED‼️

The NCG has recently been tipped off regarding the possibility of Thermochromic — Colour changing — tabs!

They are expected to be localised around N. America, especially Mexico, from the manufacturer 'Envases' (Logo pictured right).

Please contact us here, or on our Discord, if seen!
Product photo of the top of an aluminium can. A light-blue can tab, resembling the NCG species Parvum foramen (Family Duoforaminis) is attached to the top. Information regarding this potential specimen is listed in the post. Image of the back of an aluminium can. To the right of the barcode, a logo is circled in red. It consists of three silver downwards-curved lines stacked on top of each other. Context within the post. Photo Credit: Voyager Annelid
November 15, 2024 at 10:45 PM
nitripervalidae.bsky.social
Fair play to them, they went with a brilliant choice of Nitri!

Acutios parvum (family Acutiforaminis — it's actual status on Freeway Cola hasn't actually been established yet, though the limited samples we have seen have not shown its presence in this host yet.

Keep an eye out!
The back end of the Lidl Freeway Cola Truck. It is vinyl printed to give the appearance of the top of a soda can, including the presence of an Acutios parvum specimen — refer to next image. A Nitri (Can tab) of the family Acutiforaminis, known as Acutios parvum. It has a small, flat Primary Oral Groove (Top hole), and a largely square Secondary Oral Groove (Bottom hole), of the same diameter as the P. Oral Groove. The body is largely debossed, surrounded by a heightened border. This specimen has a partially complete Rivet Structure, having a square Rivet Island with a pinched shape at its bottom — no Rivet is present in the specimen.
November 15, 2024 at 5:45 PM
nitripervalidae.bsky.social
Name a better trio, I'll wait

It's official, Faba and Minimus are no more! The former Faba foraminis and Minimus foraminis have been brought together into genus Parvum with their more common P. foramen brethren, bringing the total of Parvum species to three.

Changes now live @
thefoxxo.com/ncg/!
Note: Specialist terminology relating to Nitripervalidology — the classification and collection of can tabs — used in this ALT Text. Please comment if you need clarification, as at the time of posting this, the NCG website is not fully screenreader friendly and guides to Nitri anatomy are not yet published on our Bluesky account. In the future, this will be under our pinned post. An image of 3 Duoforaminid Nitri (Can tabs) lined up against a bright blue background. The left and right Nitri are angled 30° away from the centre in their opposing directions. Each Nitri has a label below it, with its latin name. From left to right: Parvum minimus (Formerly 'Minimus foraminis') — a stereotypical soda can stay-tab, with a small, flat pill shaped Primary Oral Groove. Its body is slightly smaller than its other Parvum counterparts. This specific specimen has no chip, a fully intact rivet island with a rivet attached, and a slanted Secondary Oral Groove. Parvum foramen — the most common Nitri in the Western World. Slightly larger than P. minimus, with a more rounded Primary Oral Groove. There are no other major differences in appearance between the two. This specific specimen has no chip, a fully intact rivet island with a rivet attached, and a slanted Secondary Oral Groove. Parvum fabaforaminis — again, similar in the shape and size of the Body and Secondary Oral Groove to P. foramen, though with a Primary Oral Groove that is noticably wider and more bean-shaped. This specific specimen has a chip, a fully intact rivet island with a rivet attached, and has no slant in its Secondary Oral Groove.
November 13, 2024 at 12:12 AM
nitripervalidae.bsky.social
She's just like us fr

Two quite accurately presented Nitri! Very close to what is currently classified as Faba foraminis of the family Duoforaminis, but as a heads up, that might not be the case for too much longer, some reclassifications to come 👀

thefoxxo.com/duoforaminis/
File photo of a Nitri, currently classified as Faba foraminis of the family Duoforaminis. Screenshot of the NCG website, showing 3 tabs. Top to bottom: Minimus foraminis Obtained by NCG: 1 Parvum foramen Obtained by NCG: Many Faba foraminis Obtained by NCG: Many They all share close physical characteristics, being near identical aside from the current M. foraminis being slightly shorter in stature. The Primary Oral Groove of M. foraminis is small, with a well defined and flat top + bottom. The Primary Oral Groove of P. foramen is taller than that of M. foraminis, with a more rounded, almost ovular shape. The Primary Oral Groove of Faba foraminis is wider than those of the previous two species, having a definingly striking bean-shape.
November 11, 2024 at 9:32 PM
nitripervalidae.bsky.social
Hands up, we made a mistake, and we're shamelessly going to use it to show off some cool Nitri!

For over a month now, the NCG has had two different Os Parvums, while going through a collection we had access to we added these 2 under the exact same name, over 2 different families (1/2)
(Formerly) Os Parvum, a small Acutiforaminid Nitri (That's a can tab for normal people) that commonly inhabits soft drink cans. Its Primary Oral Groove is small and flat, and the Secondary Oral Groove is square with slightly rounded edges. The Rivet Island is square, slightly pinched towards the bottom, and the entire centre of the tab's body is slightly indented with a thick border around its edge. The top of the tab is relatively curved. Os parvum, a Nitri very similar to the one in image one. However, its Secondary Oral Groove is rounded towards its top, placing it within the family of Duoforaminis instead. The top of the tab is completely flat and squared off too. The rivet island is not present in this specimen, but it would presumably be the same.
November 10, 2024 at 9:57 PM
nitripervalidae.bsky.social
Nitri spotted!

Not a great angle for an ID, but we are currently in the process of classifying these types of tabs. They'll fall under the family Opertoforaminis when we do!

Can I ask what country this is from? They seem to be a mostly SE Asian find when they do show up.
An undescribed Nitri/Can Tab, still attached to its host can. It curiously has no sign of a Primary Oral Groove — The top hole. Unlike most modern members of the family Opertoforaminis, which similarly lack a Primary Oral Groove, there is no outline/indent in the shape that the oral groove would typically take, with this Nitri simply being flat metal.
November 10, 2024 at 6:40 PM
nitripervalidae.bsky.social
Wow, It's empty here.

Just a temporary pinned post for the time being, if you see this you're early!

For the time being, check out our Discord Server!

(Feel free to tag us for IDs, queries, and suggestions!)
Image of the NCG's Coat of Arms. A black shield with a yellow outline, containing a depiction of a generic Duoforaminid Nitri/Can Tab. To its top in yellow text are the letters 'NCG, and on the bottom in similarly yellow text reads the date '8-8-2024'. Within the top-left of the yellow border reads the word 'Nitripervalida'.
November 10, 2024 at 4:39 PM