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Spectacular Crab Spider

Thomisus spectabilis

Description:

Thomisidae; Thomisus; Thomisus spectabilis Doleschall, 1859. I am not at all sure of my ground with this spider. In fact, it would be more truthful to say that I am in a state of confusion and not secure in its identification. Here is what brought me to this point. I have taken a few photos of Thomisidae in recent years (I think I have only published one or two in PN so far) and, like everyone else, I feel that I can identify a member of the Thomisidae as soon as I see it. Identifying the genus and species is not so easy and requires some research. I started with inaturalist.org and pretty quickly saw several images that look just like mine, all identified as T. spectabilis. So that was a start. Then I noticed that there were white Crab Spiders on the same website, also called T. spectabilis. Now I just needed to sort this out and I'd be OK. My spider has large pedipalps so it is likely to be male, could the white one be a female. So I turned to Wikipedia. There, I saw that Wiki had T. spectabilis, a white one just like many images in inaturalist (and gave the common name as the White Crab Spider). But here is where it gets really tricky. Wiki mentions that the male is smaller than the female "female is up to 10 mm, the male 6.2 mm." , but no mention of the colour of the male and no picture. Now, I know (from Wiki) that the male is a little more than half the size of the female. So, back to inaturalist.org to have another look. Then I see a picture which I assume is a male on the back of a female - https://www.inaturalist.org/observations.... The male looks like mine and the female looks like the picture in Wikipedia. Problem solved ? Maybe, but not yet sure. The picture I just mentioned in inaturalist.org shows the male (if that is what it is) to be about one tenth the size of the female. That does not give me a problem in general, it just gives me a problem with the sizes in Wikipedia. e.g. I know that in many spider genera, the male can be miniscule in comparison to the female, I think Argiope spiders demonstrate this very well. So, what to do now. Well, I decided as you can see, to go with my spider being a male Thomisus spectabilis. The worst that can happen is that I could be corrected by another PN member (or Ranger) who knows his spiders better than me. That seems to be my best way out. I not only don't mind being corrected, I love it. How else can we learn.

Habitat:

This small crab spider was spotted climbing on large tangle of Tropical Whiteweed (Ageratum conyzoides) on a strip of land between rice fields. I have spotted many different species on this particular plant, to the extent that I have this jotted down in my notes as a "hot spot" for insects and spiders.

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4 Comments

John B.
John B. a year ago

Hi leel.colin,
thanks for your comment. I really appreciate your taking the trouble to give me so much information. As you noticed, I was really struggling with this spider when I was trying put together a spotting for PN last August. The fact is that all the information was out there, but it was sometimes so poorly presented that it often seemed contradictory and the whole thing became quite confusing. If I only had your information back then, it would have made everything easier. At least, next time I have a similar problem, your info and pictures will be the first I will turn to and that will be a great help. Thanks again, John B.

leel.colin
leel.colin a year ago

Hi John, I know this was posted last year 2022, but only just came across your post in my Google search for the male Thomisus spectabilis. You mentioning that the male is being described as small compared to the female, whilst the one you sighted is large. I had a similar problem with the Australian Golden Orb Weaver, with everything I read saying that it was small compared to the female. With help from other knowledgeable people, I now know that there are "dimorphic males" which were large, some being almost as large as the female in the same web. You can see my page on it here: https://ausemade.com.au/flora-fauna/faun...

John B.
John B. a year ago

Hi Mark, thank you for helping me with this spider. Sorry for taking so long to answer, I just sat down at my computer and saw that your comment came in about an hour ago. For the past hour I have been up to my elbows in dog food and making sure the dogs (and cats) are all OK before sunset - my daily routine. I often think about you when I see the extreme weather in some parts of Australia. Hope its OK where you are. John B.

Mark Ridgway
Mark Ridgway a year ago

Looks like the male.

John B.
Spotted by
John B.

Palauig, Central Luzon, Philippines

Spotted on Jun 27, 2018
Submitted on Aug 7, 2022

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