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 Post subject: Re: Dangerous creatures, plants, etc.. quiz (RV)
Unread postPosted: Sat Jun 19, 2010 6:54 am 
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Achatinidae are a family of snails with large to very large shells (20-230mm in height). They are usually ovate-conic, rarely cylindrical and have variable colour patterns. Coiling is usually dextral, rarely sinistral. The shell is imperforate, sometimes scarcely umbilicate.

There are at least 75 species of the genus Achatina.

The shell of A. fulica is narrowly conic, up to 200mm in length although 50-100 is the average. The shell colour is variable but usually consists of alternating brown and cream (or white) bands. The body is browny-grey in colour.

They are known to carry a parasite, rat lungworm, that can cause serious diseases such as eosinophlic meningitis in humans. According to the University of Georgia website, these diseases can be transferred to humans by eating raw, undercooked infected snail meat or contaminated vegetables. Vegetables can become contaminated if the snails move across them.

They look very similar to our common Orthalicus ubdatus. Generally the shell of the invader is narrower.

http://docs.google.com/viewer?a=v&q=cac ... coqMDY3KqQ

and other sources

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 Post subject: Re: Dangerous creatures, plants, etc.. quiz (RV)
Unread postPosted: Sat Jun 19, 2010 7:05 am 
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They make expensive pets... :(

A child brought 3 of the snails into the Miami area as pets in 1966 and his grandmother subsequently released them into her garden. By 1973, those three had spawned a population of 18,000 snails. The government spent $1 million over the next decade trying to get rid of them. One pair of mated adults can lay 1,200 eggs per year - and only one mating is required.

For photo id's: http://www.padil.gov.au/viewPest.aspx?id=228

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 Post subject: Re: Dangerous creatures, plants, etc.. quiz (RV)
Unread postPosted: Sat Jun 19, 2010 9:51 am 
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No, there is a species similar to Bulinus snails.


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 Post subject: Re: Dangerous creatures, plants, etc.. quiz (RV)
Unread postPosted: Sat Jun 19, 2010 1:53 pm 
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Schistosomiasis, also known as Bilharzia or Snail fever, is a parasitic disease caused by trematode flatworms of the genus Schistosoma. The common fresh water snails Bulinus globosus, Bulinus africanus and Biomphalaria Pfeifferi are important intermediate hosts for the trematode parasite. Schistosoma haematobium is responsible for the disease urinary schistosomiasis in sub-Saharan Africa. The schistosomiasis caused by Schistosoma mansoni is intestinal schistosomiasis.


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 Post subject: Re: Dangerous creatures, plants, etc.. quiz (RV)
Unread postPosted: Sat Jun 19, 2010 1:53 pm 
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Bulinus forskalii: a new potential intermediate host for Schistosoma haematobium?

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 Post subject: Re: Dangerous creatures, plants, etc.. quiz (RV)
Unread postPosted: Sat Jun 19, 2010 2:02 pm 
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Toko wrote:
In Kruger NP occur some dangerous snails:
1. What species?
2. What features could help you to distinguish a harmless snail from a dangerous one?


1. Well done Ezet & Klippspringer :thumbs_up:
2. How to ID Bulinus and Biomphalaria?


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 Post subject: Re: Dangerous creatures, plants, etc.. quiz (RV)
Unread postPosted: Sat Jun 19, 2010 11:45 pm 
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A description on page 137 - http://www.ncbi.nlm.nih.gov/pmc/article ... 11/?page=3

To summarise - ovate shell, higher than it is wide, three or more whorls, and large aperture. Shell drawn out in length, and then termed turreted.

Toko, great images on page 136 for all the shells you are looking for and comparisons. :thumbs_up:

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 Post subject: Re: Dangerous creatures, plants, etc.. quiz (RV)
Unread postPosted: Sun Jun 20, 2010 11:15 am 
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I think, I should give IT to Elzet :clap: :clap: :clap:

Dangerous snails are smaller than 2cm (lenght of the shell).
They occur in the water, floating, attached to vegetation like lilies or lying on the bottom.
Harmless African snails have always an operculum, dangerous ones not. It is a kind of door on the foot to close the door of the house.
The Bulinus species have an left hand side opening of the shell.

http://www.iamat.org/pdf/be_aware_of_sc ... miasis.pdf" onclick="window.open(this.href);return false;

When humans are in contaminated freshwater, larvae penetrate the skin. The larva morphs into a migrating schistosomulum and travels to the lungs. In the lungs, the schistosomlum undergoes developmental changes, which allow it to migrate to the liver where it feeds on red-blood cells, grows into an adult worm and finds a partner. After finding its mate, the pair unites and copulation begins.
Pairs of male and female worms relocate to the rectal veins, in the case of S. mansoni.
In the case of S. haematobium, the worms migrate to the bladder, kidneys and ureters.
Worm pairs can dwell in the body for an average of four and a half years, but may persist up to 20 years. The pathology associated with schistosomiasis is caused by the cellular infiltration resulting from antigens secreted by trapped eggs. These antigens elicit a vigorous bodily immune response creating illness, rather than the worms themselves.


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 Post subject: Re: Dangerous creatures, plants, etc.. quiz (RV)
Unread postPosted: Sun Jun 20, 2010 4:44 pm 
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Hi Toko, amazing facts coming through. The opening of the shells - never thought 'doors' will play such an important part.

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 Post subject: Re: Dangerous creatures, plants, etc.. quiz (RV)
Unread postPosted: Fri Jul 02, 2010 8:37 pm 
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Phewwt, I slipped up here. Apologies. Next to post is IT.

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 Post subject: Re: Dangerous creatures, plants, etc.. quiz (RV)
Unread postPosted: Fri Jul 09, 2010 12:40 am 
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:whistle:

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 Post subject: Re: Dangerous creatures, plants, etc.. quiz (RV)
Unread postPosted: Fri Jul 16, 2010 9:19 pm 
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Anyone?

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 Post subject: Re: Dangerous creatures, plants, etc.. quiz (RV)
Unread postPosted: Sat Jul 17, 2010 1:58 am 
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While driving through the Caprivi Strip, you will see a warning triangle with an exclamation danger mark in the middle; underneath, will be the name of a dangerous animal that likes to cross the highway! Which animal?

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 Post subject: Re: Dangerous creatures, plants, etc.. quiz (RV)
Unread postPosted: Sat Jul 17, 2010 2:07 am 
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Elephants?

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 Post subject: Re: Dangerous creatures, plants, etc.. quiz (RV)
Unread postPosted: Sat Jul 17, 2010 2:11 am 
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Siobain, IT :clap: :clap:

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