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Achatina fulica


Achatina fulica
写真に関する情報
著作権: Foozi Saad (foozi) Gold Star Critiquer/Gold Note Writer [C: 2800 W: 0 N: 6695] (25837)
ジャンル: Animals
メディア: カラー
撮影した年: 2010-06-17
カテゴリー: Molluscs
カメラ: Nikon D90, Nikkor 18-135mm
Exposure: f/7.1, 1/640 seconds
More Photo Info: [view]
Photo Version: Original Version
アップロードした日: 2010-06-17 6:27
ページビュー: 3019
ポイント: 20
[Note Guidelines] アーティストからのコメント
This snail is quite abundant in my place. They like to hide in the cool and damp places especially in the garden. It is also considered as pest.

The East African land snail, or giant African land snail, scientific name Achatina fulica, is a species of large, air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Achatinidae.

This mollusc is now known as one of the worst invasive species in the world. In recent times, the land snails have been kept as pets; however, they are illegal to possess in some countries including the United States. The snails are easy to keep and when bred in captivity are unlikely to carry parasites.
The giant East African snail is a macrophytophagous herbivore; it eats a wide range of plant material, fruit and vegetables. It will sometimes eat sand, very small stones, bones from carcasses and even concrete as calcium sources for its shell. In rare instances the snails will consume each other.

In captivity, this species can be fed on grain products such as bread, digestive biscuits and chicken feed. Fruits and vegetables must be washed diligently as the snail is very sensitive to any lingering pesticides. In captivity, snails need cuttlebone to aid the growth and strength for their shells. As with all molluscs, they enjoy the yeast in beer, which serves as a growth stimulus.

Reproduction

The Giant East African Snail is a simultaneous hermaphrodite; each individual has both testes and ovaries and is capable of producing both sperm and ova. Instances of self fertilisation are rare, occurring only in small populations. Although both snails in a mating pair can simultaneously transfer gametes to each other (bilateral mating), this is dependent on the size difference between the partners. Snails of similar size will reproduce in this way. Two snails of differing sizes will mate unilaterally (one way), with the larger individual acting as a female. This is due to the comparative resource investment associated with the different genders.[citation needed]

Like other land snails, these have intriguing mating behaviour, including petting their heads and front parts against each other. Courtship can last up to half an hour, and the actual transfer of gametes can last for two hours. Transferred sperm can be stored within the body for up to two years. The number of eggs per clutch averages around 200. A snail may lay 5-6 clutches per year with a hatching viability of about 90%.

Life cycle

Adult size is reached in about six months; after which growth slows but does not ever cease. Life expectancy is commonly five or six years in captivity, but the snails may live for up to ten years. They are active at night and spend the day buried underground.

The East African Land Snail is capable of aestivating for up to three years in times of extreme drought, sealing itself into its shell by secretion of a calcerous compound that dries on contact with the air. This is impermeable; the snail will not lose any water during this period.

Ref: Wikipedia

horias, pierrefonds, maurydv, CeltickRanger, anel has marked this note useful
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Critiques [Translate]

  • Great 
  • horias Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 837 W: 58 N: 2084] (11033)
  • [2010-06-17 6:29]

Hi Foozi
Wonderful this lovely snail!
Colors and details are lovely!
Horia

Ciao Foozi, beautiful snail in a lovely composition, fantastic bright colors, wonderful blurry BG, splendid sharpness and fine details, very well done my friend, ciao Silvio

Hi Foozi,

The branches are framing well the snail. The close-up view is allowing me to see with precision the details and the colors of the snail. The late morning light is enhancing the colors. Have a nice day.

Pierre

Ciao Foozi. Good verttical dor thi detailed and sharpened snail. excitin colours and playing of light. Very well done.

Roberto

Hallo Foozi,
a very good macro shot of this snail, superb sharpness and bright colours, excellent POV and DOF, nice composition with a very pleasing BG.
TFS
Best regards
Maurizio

  • Great 
  • PeterZ Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 5098 W: 166 N: 13042] (48618)
  • [2010-06-17 12:20]

Hello Foozi,
Very nice photo of this snail. Beautiful bright colours, great DOF and good sharpness. Excellent POV.
Regards,
Peter

hello Foozi

excellent close-up photo of this mollusc, with fine POV and appropriate framing,
fine focus excellent sharpness and details, excellent density of colours,

TFS

Asbed

Hi Foozi,

This is a lovely shot, with sharp details and nice lighting. Very well done!

TFS,
Kedar

  • Great 
  • anel Gold Star Critiquer/Gold Note Writer [C: 3050 W: 3 N: 8714] (40568)
  • [2010-06-20 2:38]

Hello Foozi,
Interesting posting Foozi. I didn't know about this invasive species which seems to originate from Africa. I hope you don't have too many of them in your garden. The shell on its back has a very beautiful shape. Your picture also is well presented. Amazing capacity to survive.
Very special posting.
Thanks and kind regards
Anne

Hellow Foozi,
Its amazing how destructuve these little buggers can be, they are always destroying my wifes Thai salads in the garden.Nice perspective with good clarity.
erwin...

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