udang purba umur 220juta tahun dijumpa semula!!

cluesan

well, that's a prehistoric creature. supposed to look like that.

ni lagi satu ikan prehistoric, Coelacanth, spesis berusia 410 juta tahun, masih hidup sehingga sekarang, tapi hampir pupus. Coelacanth give birth to their child, not laying eggs.



[ Last edited by  cluesan at 1-9-2008 07:58 PM ]

cluesan

Rains revive prehistoric shrimp

Heavy summer rains have helped one of the UK's most ancient creatures to flourish in south west Scotland.
Specimens of the tadpole shrimp date back to at least 220 million years ago. It is now almost extinct in the UK but recent heavy downpourshave seen the creature flourish at the Caerlaverock reserve in Dumfriesand Galloway. Wildfowl and Wetlands Trust researcher Larry Griffin said thatthree-times the average rainfall for August created "ideal conditions"for the species.The creature had been thought to be extinct in Scotland until it was found at Caerlaverock on the Solway Firth four years ago. Mr Griffin, who spotted the tiny species in the same location in 2004, was "very excited" to see it return.

Flushed away
"We have had up to three-times the average rainfall this month," he said. "So the ponds that dried out in early summer killing the fishand other invertebrates will have been drenched in August, flushingaway the salt water to make the ponds much fresher. "This will have created ideal conditions for the re-emergence of species such as the tadpole shrimp, like it did in 2004." The tadpole shrimp lives in seasonal pools which dry out in the summer, killing predators and competitors. It has evolved to produce two types of eggs, one which hatches soonafter production if the conditions are right and the other which canlie dormant in dried-out pools for decades. The shrimp, which resembles a small horseshoe crab, has a fastlifecycle - developing from an egg to an adult in several weeks withthe right temperatures and living for just four to six weeks. It had been previously found in nearby Preston Merse,Kirkcudbrightshire, in 1907, but the population was thought to havebeen wiped out when the ponds were lost to the sea in 1948. The only other known UK population before the Caerlaverock discovery in 2004 was at the New Forest in England. Fossilised remains prove tadpole shrimps were around 220 million years ago in the Triassic period - pre-dating the dinosaurs. Experts say they do not appear to have changed in appearance since that time.- BBC News 28 August 2008.


   
Memang tak berubah dari dulu lagi.

[ Last edited by  cluesan at 1-9-2008 08:10 PM ]

matlabu888

kenapa tak sama pun gambar tadpole shrimp dgn udang harimau dalam post #1.

cluesan

yg tadpole shrimp ni gambar yg sebenar.

ocho

ok thanks bro . mcm belangkas ek sama species agaknya ..

cluesan

erm, klu tgk dari nama, Tadpole Shrimp ngan Horseshoe Crab(belangkas), Shrimp(udang) and Crab (ketam). mungkin dari species yg lain kot.   tapi dua2 ni da hidup selama berjuta2 tahun, dan masih tidak berevolusi. Amazing.

dexa

saya rasa memang interesting tentang tadpole shrimp ni dan tak ada
evolution pun dari dulu... berjuta-juta tahun berlalu -

a great info and good knowledge about this -

alyana

Originally posted by cluesan at 1-9-2008 10:49 PM
erm, klu tgk dari nama, Tadpole Shrimp ngan Horseshoe Crab(belangkas), Shrimp(udang) and Crab (ketam). mungkin dari species yg lain kot.   tapi dua2 ni da hidup selama berjuta2 tahun, dan masih ...

baguslaa, itu menunjukkan tidak semua makhluk mengalami evolusi

meow_nakal

looks pretty ordinary to me..

Laila12

biar betul....