How many species of arachnids may there be?

[CladeArthropoda]

Many papers have attempted to give estimations to the number of insect species. Some give as high as 20 to 30 million, though most are between 3 and 10 million. However, much less attention has been given to arachnids in this regard. One paper (https://www.frontiersin.org/articles/10.3389/frchs.2023.1101141/full) estimates just over a million, compared to the just over 110,000 species known today. This seems rather low compared to insects, with even low end estimates being over double this amount. You may say its because arachnids are all carnivorous, but there is a large diversity of detritivorous and herbivorous mites.

So have you seen any other estimates of total arachnid species richness? What do you think it may be?

 

[Brewser]

We will never know... The Natural World is Constantly in flux.
New Lifeforms are emerging and Others are going extinct.

 

[Ultum4Spiderz]

It should be significantly less than insects because that’s what they eat.

We will never know... The Natural World is Constantly Changing.
However I really like Your Pictures.
Especially the Jumping Spider Riding on the Tick. lol
Giddy Up.

That’s how jumping ticks get around.

 

[viper69]

Insects are of greater #
There’s a spider out there that is not a carnivore

 

[CladeArthropoda]

It should be significantly less than insects because that’s what they eat.

That’s how jumping ticks get around.

But there is also mites, many of which are parasites, herbivores, and detritivores.