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2 years, 7 months ago

Is a Tarantula a spider? Or an arachnid? Or both?

I've checked out a ton of resources, and most say a Tarantula is a member of the arachnid family, but not a spider. However, lots of reliable resources refer to them as "large hairy spiders." Wish I could get the real scoop, if anyone has it!
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omicron's Avatar
omicron | 2 years, 7 months ago
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In the first place, Tarantula's are Arachnids (which includes scorpions, ticks, and mites). Period.

If you're reading resources saying that Tarantulas are not spiders, they might be referring to something that's unique to Tarantulas, which is that their jaws move up and down, whereas for all other spiders the fangs move from side-to-side in a horizontal sweep.

But that's hardly enough to say that Tarantulas are not spiders. There's a lot of diversity within Order Araneae (just spiders, without the scorpions and mites and ticks).

If someone is trying to tell you that Tarantulas are not "spiders", then ask them where daddy long legs fit in, which has only one body part.

Now *that's* a spider that darn near doesn't deserve the designation.

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lilyloretta | 2 years, 7 months ago Report

Daddy long legs...

They've been creeping me out for many years! haha :p

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victoria_reid | 2 years, 7 months ago Report

Very comprehensive! Thanks!

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albanian | 2 years, 7 months ago
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Tarantulas are spiders and spiders are Arachnids. I have not seen anyone claim otherwise. The only thing I can think of that may be confusing you or some web site somewhere is that the spiders constitute the Order Araneae and that order is divided into two suborders. Tarantula are in the Suborder Opisthothelae which include a couple of thousand species of spiders which are sometimes called primitive spiders. Spider is a plain English word, all the Opisthothelae are spiders in English. The distinction between the two groups is of interest mainly to scientists who study spiders.
images:

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victoria_reid's Avatar
victoria_reid | 2 years, 7 months ago Report

Thank you! Someone else put them in the suborder Mygalomorphae. Any thoughts on that?

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dsaldridge | 2 years, 7 months ago Report

Thanks, Albanian. I was just about to say that. :)

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albanian | 2 years, 7 months ago Report

The Mygalomorphae are an infraorder of spiders, that's the next level down below suborder. The Mesothelae are the other infraorder in the suborder, but there are only a few of them. Just generally speaking, even though animal classification is a hard science, deciding on the levels to group animals under is more of a judgement call and some scientists sort them differently.

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dsaldridge's Avatar
dsaldridge | 2 years, 7 months ago
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This is their classification:

Kingdom: Animalia
Phyllum: Arthropoda
Class: Arachnida
Order: Araneae
Suborder: Mygalomorphae
Superfamily: Theraphosoidea
Family: Theraphosidae
Thorell, 1870

So, technically, since they are in the class Arachnida, they are arachnids, or spiders. The word arachnid comes from the greek word ἀράχνη (aráchnē), meaning "spider"

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victoria_reid | 2 years, 7 months ago Report

Thank you! Someone else put them in the suborder Opisthothelae. Any thoughts on that?

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iklilian | 2 years, 7 months ago
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squirreliegirl | 2 years, 7 months ago
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spiders are arachnids and tarantulas are spiders, I mean my tarantula Earl looks just like the wolf spider hanging from my door way, except Earl is bigger and furrier.

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pieisgood's Avatar
pieisgood | 2 years, 7 months ago Report

dude, you have a TARANTULA for a pet? no offense, but EWWW!

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lilyloretta | 2 years, 7 months ago Report

What a lovely name for a tarantula! ;)

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victoria_reid | 2 years, 7 months ago Report

My pet Chilean Rose, Cadbury, is a terrific Tarantula. We use her for reptile shows, and she seems to enjoy being the star of the show for a few minutes.

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petermusante | 2 years, 7 months ago
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A Tarantula is a large spider known for being very hairy unlike many spiders.

"Arachnids are a class (Arachnida) of joint-legged invertebrate animals in the subphylum Chelicerata. All arachnids have eight legs, although in some species the front pair may convert to a sensory function. The term is derived from the Greek word ἀράχνη (aráchnē), meaning "spider".2"

Arachnid is a general identification,outlines what traits an organism must have to be a spider. Tarantula is the species like a wolf and a dog.. they're both canines but they are different species.

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profitts | 2 years, 7 months ago
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Spiders are classified as arachnids. Arachnids are creatures with 8 legs. A tarantula has eight legs, therefore it is a spider, thus making it an arachnid.

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chrisbrowne | 2 years, 7 months ago
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Tarantulas comprise a group of hairy and often very large spiders belonging mainly to the family Theraphosidae.

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pieisgood's Avatar
pieisgood | 2 years, 7 months ago Report

but i thought they were spiders? My science teacher used to say that they were arachnids. She had a tarantula in her classroom. I only remember it because it creeped me out and fascinated me at the same time.

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pieisgood's Avatar
pieisgood | 2 years, 7 months ago
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a spider technically falls under the category of arachnid. I think it means to have 8 legs. A scorpion is an arachnid too.

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