Fossil Cyrtospirifer sinensis Seashell 1.4 g to 5.7 g small size 2 pieces Lot

Description

Nice fossil specimens of Cyrtospirifer sinensis seashell from Yuannan province (SW region) of China.
- 2 pieces lot
Specimens are very clear showing good details.  Size: 13x11x7 mm to 21x18x12 mm each piece
Weight: 1.4 to 5.7 gram each piece
***
Cyrtospirifer sinensis
Selltotheworld
From all around the world
Fossil Cyrtospirifer sinensis Seashell 1.4 g to 5.7 g small size 2 pieces Lot
Nice fossil specimens of
Cyrtospirifer sinensis
seashell
from Yuannan province (SW region) of China.
- 2 pieces lot
Specimens are very clear showing good details.
Size: 13x11x7 mm to 21x18x12 mm each piece
Weight: 1.4 to 5.7 gram each piece
***
Cyrtospirifer sinensis
Study of abundant well-preserved specimens of cyrtospiriferid brachiopods from early Famennian
triangularis
Zone shelf deposits from South China shows that none of them can be attributed to the genera
Cyrtospirifer
Nalivkin
in
Fredericks, 1924, or
Tenticospirifer
Tien, 1938, as previously assigned. Some of these forms are reassigned to the new genus
Plicapustula
, with
Spirifer
(
Sinospirifer
)
gortanioides
Grabau, 1931 serving as the type species. Restudy of the Upper Devonian cyrtospiriferids of North America and South China indicates that genera of the subfamily Cyrtospiriferinae all developed a delthyrial covering usually composed of two or more thin plates referred to as a composite pseudodeltidium. The delthyrial covering of
Cyrtiopsis
Grabau, 1923 and other genera of the subfamily Cyrtiopsinae is a convex pseudodeltidium. The lack of a pedicle foramen penetrating the pseudodeltidia of Frasnian
Cyrtospirifer
indicates that most species had an atrophied pedicle. The pseudodeltidia of most early Famennian cyrtospiriferids are perforated by a pedicle tube or a central hypothyrid foramen as in
Sinospirifer
Grabau, 1931, or a hypothyrid-to-submesothyrid foramen as in
Lamarckispirifer
Gatinaud, 1949 and
Plicapustula
n. gen. The orientation and concavity of the interarea, used with other shell characteristics, are useful characters in species-level taxonomy of Famennian cyrtospiriferids.
Four major types of radial micro-ornament characterize Late Devonian species of
Cyrtospirifer
and other genera of the Cyrtospiriferinae. These are 1) the
verneuili
type, consisting of microspines arising from the shell surface with spine bases extending into the primary shell layer, with radial capillae; 2) the
whitneyi
-
subextensus
type with small pustules both in the grooves and on the plications; 3) the
subarchiaci
type characterized by pustules only on plications; and 4) the
hayasakai
type with coarse elongated pustules on plications and capillae in grooves. There is a notable increase in complexity of the medial plication patterns of shells of Late Devonian cyrtospiriferinids. Simple sinal plication patterns characterize shells of Frasnian species of
Cyrtospirifer
and related genera, whereas most early Famennian cyrtospiriferinids developed complex patterns. We have documented three variations in the structure of the cardinal processes of the Late Devonian cyrtospiriferids. These consist of 1) unsupported; 2) supported by callus (secondary shell material) from below; or 3) supported by a median septum.
In Hunan-South China, cyrtospiriferid diversity was low in the late Frasnian, but a postextinction radiation of cyrtospiriferids in the very early Famennian resulted in the evolution of numerous new genera within the interval of the undifferentiated
triangularis
Zone shortly after the Frasnian–Famennian (F–F) mass extinction. Cyrtospiriferid brachiopods of the subfamilies Cyrtospiriferinae and Cyrtiopsinae are important elements of the early Famennian post-extinction survivor and recovery faunas that migrated and radiated rapidly to occupy niches vacated by extinct clades of late Frasnian brachiopods.
Item Specifics
Modified Item :
No
Country/Region of Manufacture :
China
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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.
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From all around the world
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Fossil Cyrtospirifer sinensis Seashell 1.4 g to 5.7 g small size 2 pieces Lot
Nice fossil specimens of
Cyrtospirifer sinensis
seashell
from Yuannan province (SW region) of China.
- 2 pieces lot
Specimens are very clear showing good details.
Size: 13x11x7 mm to 21x18x12 mm each piece
Weight: 1.4 to 5.7 gram each piece
***
Cyrtospirifer sinensis
Study of abundant well-preserved specimens of cyrtospiriferid brachiopods from early Famennian
triangularis
Zone shelf deposits from South China shows that none of them can be attributed to the genera
Cyrtospirifer
Nalivkin
in
Fredericks, 1924, or
Tenticospirifer
Tien, 1938, as previously assigned. Some of these forms are reassigned to the new genus
Plicapustula
, with
Spirifer
(
Sinospirifer
)
gortanioides
Grabau, 1931 serving as the type species. Restudy of the Upper Devonian cyrtospiriferids of North America and South China indicates that genera of the subfamily Cyrtospiriferinae all developed a delthyrial covering usually composed of two or more thin plates referred to as a composite pseudodeltidium. The delthyrial covering of
Cyrtiopsis
Grabau, 1923 and other genera of the subfamily Cyrtiopsinae is a convex pseudodeltidium. The lack of a pedicle foramen penetrating the pseudodeltidia of Frasnian
Cyrtospirifer
indicates that most species had an atrophied pedicle. The pseudodeltidia of most early Famennian cyrtospiriferids are perforated by a pedicle tube or a central hypothyrid foramen as in
Sinospirifer
Grabau, 1931, or a hypothyrid-to-submesothyrid foramen as in
Lamarckispirifer
Gatinaud, 1949 and
Plicapustula
n. gen. The orientation and concavity of the interarea, used with other shell characteristics, are useful characters in species-level taxonomy of Famennian cyrtospiriferids.
Four major types of radial micro-ornament characterize Late Devonian species of
Cyrtospirifer
and other genera of the Cyrtospiriferinae. These are 1) the
verneuili
type, consisting of microspines arising from the shell surface with spine bases extending into the primary shell layer, with radial capillae; 2) the
whitneyi
-
subextensus
type with small pustules both in the grooves and on the plications; 3) the
subarchiaci
type characterized by pustules only on plications; and 4) the
hayasakai
type with coarse elongated pustules on plications and capillae in grooves. There is a notable increase in complexity of the medial plication patterns of shells of Late Devonian cyrtospiriferinids. Simple sinal plication patterns characterize shells of Frasnian species of
Cyrtospirifer
and related genera, whereas most early Famennian cyrtospiriferinids developed complex patterns. We have documented three variations in the structure of the cardinal processes of the Late Devonian cyrtospiriferids. These consist of 1) unsupported; 2) supported by callus (secondary shell material) from below; or 3) supported by a median septum.
In Hunan-South China, cyrtospiriferid diversity was low in the late Frasnian, but a postextinction radiation of cyrtospiriferids in the very early Famennian resulted in the evolution of numerous new genera within the interval of the undifferentiated
triangularis
Zone shortly after the Frasnian–Famennian (F–F) mass extinction. Cyrtospiriferid brachiopods of the subfamilies Cyrtospiriferinae and Cyrtiopsinae are important elements of the early Famennian post-extinction survivor and recovery faunas that migrated and radiated rapidly to occupy niches vacated by extinct clades of late Frasnian brachiopods.
Item Specifics
Modified Item :
No
Country/Region of Manufacture :
China
Payment
By Paypal
Shipping
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.
Returns
Returns: We accept returns with any reason in 30 days.
Contact Us
We will answer buyer messages within 24 hours during working days.
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