Rarest Finds on Inaturalist

I never expected this post to blow up!

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Iā€™m a lot like you - I tend to take photos in one park in Winnipeg, so donā€™t see rare things. I did see a couple of Osprey which are not common in the city. https://inaturalist.ca/observations/53963535
I also saw a Red-bellied Woodpecker which is not common this far north. https://inaturalist.ca/observations/17772240
So, nothing special, but interesting all the same!

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An orchid, Epidendrum gelisii, was new to science recently. Eric Hagsater described it and named it after me, yahoo!

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Iā€™ve seen a lot of rare plants here in east Texas. Not sure which one(s) are the rarest. So I guess Iā€™ll look at the endangered species list and see which of them Iā€™ve seen.

Apparently none of the rare plants Iā€™ve seen are rare enough to be federally listed. Iā€™ve seen quite a few endangered birds though:
Piping Plover
Florida Grasshopper Sparrow
Florida Scrub-Jay
Red-cockaded Woodpecker

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I suppose this is the rarest Iā€™ve seen; Socorro Isopod
https://www.inaturalist.org/observations/5274530

Federal Endangered. The entirety of its occupied habitat could easily fit inside an average-sized house.

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In terms of endangerment, it goes to this scalloped hammerhead I caught two years ago (I also didnā€™t know about shark regulations in FL at the time; Iā€™ve learned my lesson since). Sadly at the time I caught it the species was listed as Endangered, and itā€™s since downgraded to Critically Endangered

But in terms of things not often seen on iNaturalist, it goes to this Spanish flag we caught on a charter boat, which as of yet only has one recorded observation: me

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My rarest find is a rotifer, Stephanoceros fimbriatus ssp. millsii. No previous observations on iNaturalist and few references I can find in other literature. The location was Antonelli Pond in Santa Cruz, CA. I have sampled this pond several times over the past year but this is the first time I have observed this critter.

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Did you receive confirmation that itā€™s indeed that species? If it hasnā€™t been seen in that long, Iā€™m sure the NYS Natural Heritage program would love to know.

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And it seems to have attracted a lot of first-time posters, which I think is really cool!

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Wow, itā€™s hard enough to find any caecilian, much less one with a teeny tiny range. Well done!

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Very nice! Iā€™m a bit further south, and have a Piedmont site with coastal plain affinities that has P. nuttallii and the northernmost station for P. curtissii (and a little bit of Rhexia).

The author of the Polygala treatment for Nacziā€™s ā€œNew Manualā€ is on iNat and was very helpful with ID and friendly.

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Not a rare species but rare on iNat

Household Fungus Beetle: mine was the 1st on iNat, now 1 of 3 obs: https://www.inaturalist.org/observations/9720065
Gall wasp Eumayria longipennis: if ID is correct, only one on iNat: https://www.inaturalist.org/observations/40597967

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A few years ago I also encountered a Polyergus lucidus queen, and the situation in which I encountered it was odd. She was outside a nest inhabited by fellow P. lucidus, which were still crawling around following a raid on a nearby Formica nest. She crawled towards the nest entrance and the P. lucidus workers immediately killed her.

Didnā€™t get any pics of the queen back then, although more recently I did post the first observation of this species: https://www.inaturalist.org/observations/16901832

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Maybe not the rarest in Singapore where I live (listed as Uncommon/Endangered I think), but a lone globally critically-endangered Straw-headed Bulbul (Pycnonotus zeylanicus) that just so happened to appear in front of me is probably my rarest (and proudest) find :)

The observation is here: https://www.inaturalist.org/observations/45761824

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Welcome to the Forum, @baoshen !

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In the late 1980s and early 1990s I would hike Hoosier Pass Ridge in Colorado up to 12,200ft. There somewhere in the thousands of acres of alpine meadow I searched out a patch about 75 ft x 150 ft that held the only armeria maritima siberica in Colorado. I found them year after year, would count the flowers, note the general health of the population, take pics then report to the Dept. of Interior.

Havenā€™t been up there in a couple decades.

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Iā€™ve been here for about a year and the rarest thing Iā€™ve seen is a Northern Map Turtle here in WV

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Painted Wood Fly - Blera pictipes. I donā€™t know if it is rare. There isnā€™t much on the species, but it is the only observation of this species on iNat Canada. Thanks to edanko for ID,

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Probably my pocket gopher or the southern plains bumblebee (which another user had to ID for me, Iā€™m not good at bees). Both are well under 1,000 observations. But I donā€™t think Iā€™ve got anything where Iā€™m the only or even one of a few dozen observers.

Is there not a project for this? (in part?)

https://www.inaturalist.org/projects/the-search-for-lost-species

I try and keep track for southern Africa here: https://www.inaturalist.org/projects/extinct-in-the-wild/journal/14609-extinct-plant-species-in-south-africa

and also undescribed species: https://www.inaturalist.org/projects/undescribed-species-and-taxa

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