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Gastromyzons, questions
June 2, 2013
4:50 pm
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olly
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On the leading edge of the snout of gastromyzons there are barbels performing a tactile function. 

I was intrigued by the outgrowths forming a fringe on the mandible of gastromyzons. This fringe of outgrowths looks like a "beard".  What is this - outgrowths of the epidermis, or another? And what is the function of this "beard"? When gastromyzon crawls on the glass and works by his mouth, it can be seen that these outgrowths touch the glass during scraping movements of mandible up.

Structure of this fringe of outgrowths differs in different species of gastromyzons.

Thank you for your answers.

 

Gastromyzon-ocellatus1.jpgImage Enlarger

Gastromyzon-viriosus.jpgImage Enlarger

Gastromyzon ocellatus. The fringe of outgrowths on the mandible is seen.

Gastromyzon-ocellatus2.jpgImage Enlarger

Gastromyzon-ocellatus-fly.jpgImage Enlarger

 

June 3, 2013
9:06 am
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Matt
Málaga, Spain
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Think what you see is the sensory papillae on the lower lip Olly? As far as I know these perform a function similar to taste buds in higher animals.

Nice photos, by the way. Smile

Cake or death?
June 19, 2013
8:39 pm
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olly
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Matt, thanks a lot! It is very interesting, external taste buds. Yes, it is logically with this method of feeding to taste biofilm before reaching the mouth.

As a consequence new guestions were born...

 

June 19, 2013
8:50 pm
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mikev
NYC
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Off topic somewhat: there is a new import item ... Southern Borneo Sucker ... I have not seen photos yet.

June 19, 2013
9:02 pm
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Plaamoo
Bellingham, Washington U.S.A.
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Who has them? Let me know if you get any details or pics please :)

June 19, 2013
9:16 pm
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torso
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offered is G. mix and G. viriosus. Of these I should get a bunch next Friday. I think "Southern-Borneo-suckers" could be G. viriosus as it's the only species seperated up till now. Interesting anyway.

Cheers Charles

June 19, 2013
9:20 pm
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mikev
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@Plaamoo,

Both Anthony and Frank, but the names are different which may mean potentially two different fishes.

Frank promised photos, not yet, and I don't feel like talking to Anthony right now.... If you learn something, I'd like to know too (not that I'll be buying any gastros at this time.)

PS. thanks, torso.

June 20, 2013
12:47 am
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Plaamoo
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I emailed Anthony. Will let you know if I get a response.

June 20, 2013
1:25 am
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mikev
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Thank you.

I'll tell you later why I don't feel like talking to him... this is not forever, but right now I'm quite annoyed.

July 14, 2013
2:40 pm
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olly
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Hello to all,

Matt said
Think what you see is the sensory papillae on the lower lip Olly? As far as I know these perform a function similar to taste buds in higher animals.

Gastromyzon-ocellatus1.jpgImage Enlarger

Gastromyzon-viriosus.jpgImage Enlarger

I think that external "taste buds" can explains the interesting feature of the behavior of some hillstreams. It looks like the "sniffing". From time to time I see gastromyzon raise his snout and may sit so for some time, especially before feeding or during feeding in the process of orientation to food. It seems to me that not only the sense of smell, but the taste reception helps them to search for food. Lifting his head gastromizon facilitates the access of dissolved chemical substances to the “taste buds”. Am I right or not? Is something known about this? What do you think? Have you observed something like that?
I think that such lifting of the snout is not for better breathing. For breathing they lift the end of the snout just slightly. Sometimes gastromyzons raise their snout before a flying or during swallow.

 

Sorry for off-topic, but with your permission I would like to ask here about the same features in Sewellia and Pseudogastromyzon for a company.
Sewellia lineolata have outgrowths (sensory papillae?) on the chin. Are these papillae are analogs of the taste buds too, or perform another function? Moreover, two pairs of barbels of Sewellia (except the barbels in the corners of the mouth) are branched like a tree. The branches on the barbels are for the increasing of the receptor surface. These barbels of most loaches are simple and unbranched and are organs of touch (???only???). Do branched  barbels of Sewellia  perform a function of not only the sense of touch, but taste too? I observe sometimes the reaction of "sniffing" of sewellias with lifting of the snout during their orientation to food. Or they sit so that ventral part of the head is open in the water (not pressed against the substrate).

 Sewellia-lineolata_sensory-papillae.jpgImage Enlarger

Sewellia-lineolata2.jpgImage Enlarger

Sewellia-lineolata_barbells.jpgImage Enlarger

Pseudogastromyzon myersi have amazing wrinkled formations behind the mouth.

Pseudogastromyzon-myersi41.jpgImage Enlarger

I found abstract of a paper with explanation of their function  (full text is not available and, probably, in Chinese).

http://en.cnki.com.cn/Article_.....603001.htm
《Acta Zoologica Sinica》 1996-03     ULTRASTRUCTURAL OBSERVATION ON THE CHIN ADHESIVE APPARATUS AND SUBGENUS DIVISION OF PSEUDOGASTROMYZON.                       TANG WEN-QIAO; CHEN YI-YU
“The ultrastructure of the chin adhesive apparatus of Pseudogastromyzon was studied with scanning electron microscope. The apparatus are composed of several dermal ridges which consist of unculi arising from single epidermal cells respectively. The unculi possibly serve as adhesive devices to the substrata and as protective organs for the associated taste buds.”
Here's pics of my female P.myersi, she loved to sit near the front glass of the tank before feeding, raising her head against the stream. I think she is "sniffing" using taste buds.

Pseudogastromyzon-myersi2.jpgImage Enlarger

Pseudogastromyzon-myersi.jpgImage Enlarger
Pseudogastromyzon-myersi3.jpgImage Enlarger
Pseudogastromyzon-myersi5.jpgImage Enlarger

Here are only my guesses and questions. Sorry for many questions.
Thank you very much for your answers.

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