<![CDATA[1A Collections]]>

<![CDATA[1A Collections]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/browse?sort_field=added&sort_dir=a&page=14&output=rss2 Tue, 09 Apr 2024 21:23:46 +0100 p1acollections@esc.cam.ac.uk (1A Collections) Zend_Feed http://blogs.law.harvard.edu/tech/rss <![CDATA[TF0905 Irregular echinoid]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/135

Title

TF0905

Irregular echinoid

Description

Stratigraphic Range

Upper Cretaceous

Taxonomy

Phylum: Echinodermata
Class: Echinodea
Subclass: Irregularia
Order: Holasteroida

Distinctive Features

Bilateral symmetry
Mouth and anus out of line
Five radial ambulacra
Interambulacra with plates

Preservation

Sediment infill
Mineral replacement of shell

Advanced notes

Set 1: Anus and mouth appear to have been drilled to emphasise their positions.
Set 2: Fracturing of shell around the anus which obscures it. This would be a weak part of the shell which diagenetic processes have crushed.

]]> Fri, 21 Jun 2019 11:18:21 +0100 <![CDATA[TF0906 Regular echinoid (cast)]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/136

Title

TF0906

Regular echinoid (cast)

Description

Taxonomy

Phylum: Echinodermata
Class: Echinoidea
Subclass: Regularia

Distinctive Features

Pentaradial symmetry
Anus and peristome lie in line
Spine attachments
Five sets of ambulacra

Preservation

Cast (internal mould of an external mould)

Advanced notes

Spine attachments very much larger than for irregular echinoids as they have to hold much larger spines. Spines on regular echinoids are for defence and preventing predation, unlike for irregular echinoids where the spines are for movement in burrows. Watch a video of regular echinoids moving: BBC Wildlife Army of Sea Urchins

]]> Fri, 21 Jun 2019 11:20:21 +0100 <![CDATA[TF0907 Regular echinoid]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/137

Title

TF0907

Regular echinoid

Description

Stratigraphic Range

Modern

Taxonomy

Phylum: Echinodermata
Class: Echinoidea
Subclass: Regularia

Distinctive Features

Pentaradial symmetry
Anus and peristome in line
Spine attachments
Ambulacra
Attachments for the jaw apparatus visible on the inside of the peristome

Preservation

Original shell material
Jaw apparatus disarticulated
Soft parts removed

Advanced notes

Look at the colour of the shell and compare it to the permineralised specimens. Colour is almost always lost in the fossilisation process, even when the preservation looks to be near-perfect.

]]> Fri, 21 Jun 2019 11:21:57 +0100 <![CDATA[TF0201 Bellerophon]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/138

Title

TF0201

Bellerophon

Subject

Specimen Age

Carboniferous

Description

Stratigraphic Range

Silurian to Triassic

Taxonomy

Phylum: Mollusca
Class: Gastropoda
Genus: Bellerophon

Distinctive Features

Coiled shell (planispiral)
One chamber

Preservation

Steinkern
(here an internal cast)

Advanced notes

This specimen resembles an ammonoid, in that it has a planispirally coiled shell. However note that there are no septa and the shell exists as one large chamber, allowing us to identify it confidently as a gastropod.

]]> Fri, 21 Jun 2019 11:27:11 +0100 <![CDATA[TF0202 Pleurotomaria]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/139

Title

TF0202

Pleurotomaria

Subject

Specimen Age

Jurassic

Description

Stratigraphic Range

Jurassic to Cretaceous

Taxonomy

Phylum: Mollusca
Class: Gastropoda
Genus: Pleurotomaria

Distinctive Features

Coiled shell (helical)
One chamber
Aperture
Spire
Body whorl

Preservation

Remineralised shell material

]]> Fri, 21 Jun 2019 11:28:55 +0100 <![CDATA[TF0203 Nerinea]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/140

Title

TF0203

Nerinea

Subject

Specimen Age

Jurassic

Description

Stratigraphic Range

Jurassic to Cretaceous

Taxonomy

Phylum: Mollusca
Class: Gastropoda
Genus: Nerinea

Distinctive Features

Coiled shell (helical)

Preservation

Remineralisation of shell material

]]> Fri, 21 Jun 2019 11:31:00 +0100 <![CDATA[TF0204 Murex]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/141

Title

TF0204

Murex

Subject

Specimen Age

Eocene

Description

Stratigraphic Range

Paleocene to recent

Taxonomy

Phylum: Mollusca
Class: Gastropoda
Genus: Murex

Distinctive Features

Coiled shell (helical)
One chamber
Aperture
Siphonal notch
Spire

Preservation

Original shell material

]]> Fri, 21 Jun 2019 11:32:30 +0100 <![CDATA[TF0205 Nucella]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/142

Title

TF0205

Nucella

Description

Stratigraphic Range

Pliocene to Pleistocene

Taxonomy

Phylum: Mollusca
Class: Gastropoda
Genus: Nucella

Distinctive Features

Coiled shell (helical)
One chamber
Spire
Body whorl
Aperture

Preservation

Original shell material

]]> Fri, 21 Jun 2019 11:34:22 +0100 <![CDATA[TF0206 Scaphella lamberti]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/143

Title

TF0206

Scaphella lamberti

Subject

Specimen Age

Pliocene to Pleistocene

Description

Species

Scaphella lamberti

Stratigraphic Range

Paleocene to recent

Taxonomy

Phylum: Mollusca
Class: Gastropoda
Genus: Scaphella

Distinctive Features

Coiled shell (helical)
One chamber
Aperture
Siphonal notch
Body whorl
Spire

Preservation

Original shell material

]]> Fri, 21 Jun 2019 11:36:08 +0100 <![CDATA[TF0207 Barthrotomaria reticulata]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/144

Title

TF0207

Barthrotomaria reticulata

Subject

Specimen Age

Jurassic

Location

Coralline Oolite, Upware, Cambridgeshire

Description

Species

Barthrotomaria reticulata

Stratigraphic Range

Jurassic

Taxonomy

Phylum: Mollusca
Class: Gastropoda
Genus: Barthrotomaria

Distinctive Features

Coiled shell (helical)
One chamber

Preservation

Steinkern
(here an internal cast)

]]> Fri, 21 Jun 2019 11:38:11 +0100