Crinoids Stem Fossil Specimen 0.5 g to 3.5 gram size 5 pieces Lot

Description

Nice fossil specimens of Crinoids stem fossil from China.
- 5 pieces lot
Specimens are very clear showing good details.  Size: 8x7x6 mm to 14x12x12 mm each piece
Weight: 0.5 to 3.5 gram each piece
***
Crinoids stem fossil - Traumatocrinus
Period: Triassic (220 million years old) Location: Guizhou and Yunnan,China Marine animals of the echinoderms.
Nature & Science
https://stores.ebay.com/Gao-Fu-Collectibles
Crinoids Stem Fossil Specimen 0.5 g to 3.5 gram size 5 pieces Lot
Nice fossil specimens of
Crinoids stem fossil
from China.
- 5 pieces lot
Specimens are very clear showing good details.
Size: 8x7x6 mm to 14x12x12 mm each piece
Weight: 0.5 to 3.5 gram each piece
***
Crinoids stem fossil -
Traumatocrinus
Period: Triassic (220 million years old)
Location: Guizhou and Yunnan,China
Marine animals of the echinoderms.
Crinoids are marine animals that make up the class Crinoidea of the echinoderms (phylum Echinodermata). The name comes from the Greek word
krinon
, "a lily", and
eidos
, "form". They live in both shallow water and in depths as great as 9,000 meters (30,000 ft). Those crinoids which in their adult form are attached to the sea bottom by a stalk are commonly called sea lilies. The unstalked forms are called feather stars or comatulids.
Crinoids are characterised by a mouth on the top surface that is surrounded by feeding arms. They have a U-shaped gut, and their anus is located next to the mouth. Although the basic echinoderm pattern of fivefold symmetry can be recognised, most crinoids have many more than five arms. Crinoids usually have a stem used to attach themselves to a substrate, but many live attached only as juveniles and become free-swimming as adults.
There are only about 600 extant crinoid species, but they were much more abundant and diverse in the past. Some thick limestone beds dating to the mid- to late-Paleozoic are almost entirely made up of disarticulated crinoid fragments.
Some fossil crinoids, such as
Pentacrinites
, seem to have lived attached to floating driftwood and complete colonies are often found. Sometimes this driftwood would become waterlogged and sink to the bottom, taking the attached crinoids with it. The stem of
Pentacrinites
can be several metres long. Modern relatives of
Pentacrinites
live in gentle currents attached to rocks by the end of their stem. The largest fossil crinoid on record had a stem 40 m (130 ft) in length.
Item Specifics
Modified Item
No
Country/Region of Manufacture
China
Payment
Payment: By Paypal
Shipping cost
Free shipping cost.
We send the goods to USA, Canada, UK, Australia, New Zealand, EU countries and some other European and Asian countries by E-express, a kind of fast postal service by Hong Kong Post. It usually takes about 6 to 10 working days for delivery.
We send the goods to other countries by registered airmail and will take about 8 to 14 working days for delivery.
Return policy
Returns: We accept returns with any reason in 30 days.
Messages
We will answer buyer messages within 24 hours during working days.
Nature & Science
https://stores.ebay.com/Gao-Fu-Collectibles
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Crinoids Stem Fossil Specimen 0.5 g to 3.5 gram size 5 pieces Lot
Nice fossil specimens of
Crinoids stem fossil
from China.
- 5 pieces lot
Specimens are very clear showing good details.
Size: 8x7x6 mm to 14x12x12 mm each piece
Weight: 0.5 to 3.5 gram each piece
***
Crinoids stem fossil -
Traumatocrinus
Period: Triassic (220 million years old)
Location: Guizhou and Yunnan,China
Marine animals of the echinoderms.
Crinoids are marine animals that make up the class Crinoidea of the echinoderms (phylum Echinodermata). The name comes from the Greek word
krinon
, "a lily", and
eidos
, "form". They live in both shallow water and in depths as great as 9,000 meters (30,000 ft). Those crinoids which in their adult form are attached to the sea bottom by a stalk are commonly called sea lilies. The unstalked forms are called feather stars or comatulids.
Crinoids are characterised by a mouth on the top surface that is surrounded by feeding arms. They have a U-shaped gut, and their anus is located next to the mouth. Although the basic echinoderm pattern of fivefold symmetry can be recognised, most crinoids have many more than five arms. Crinoids usually have a stem used to attach themselves to a substrate, but many live attached only as juveniles and become free-swimming as adults.
There are only about 600 extant crinoid species, but they were much more abundant and diverse in the past. Some thick limestone beds dating to the mid- to late-Paleozoic are almost entirely made up of disarticulated crinoid fragments.
Some fossil crinoids, such as
Pentacrinites
, seem to have lived attached to floating driftwood and complete colonies are often found. Sometimes this driftwood would become waterlogged and sink to the bottom, taking the attached crinoids with it. The stem of
Pentacrinites
can be several metres long. Modern relatives of
Pentacrinites
live in gentle currents attached to rocks by the end of their stem. The largest fossil crinoid on record had a stem 40 m (130 ft) in length.
Payment
Payment: By Paypal
Shipping cost
Free shipping cost.
We send the goods to USA, Canada, UK, Australia, New Zealand, EU countries and some other European and Asian countries by E-express, a kind of fast postal service by Hong Kong Post. It usually takes about 6 to 10 working days for delivery.
We send the goods to other countries by registered airmail and will take about 8 to 14 working days for delivery.
Return policy
Returns: We accept returns with any reason in 30 days.
Messages
We will answer buyer messages within 24 hours during working days.
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