1
Blastoid - Obliterate
Blastoid - Obliterate
DATE: 2013/03/18::
2
pokemon kid
pokemon kid
DATE: 2008/11/24::
3
Blastoid at The Basement
Blastoid at The Basement
DATE: 2014/04/09::
4
Unknown blastoid
Unknown blastoid
DATE: 2014/08/06::
5
Mistah Bohze bLASToid mcgONagle Album Sampler 2012
Mistah Bohze bLASToid mcgONagle Album Sampler 2012
DATE: 2012/01/19::
6
Dubstep 2012 (DubToxic Mix) BLASTOID N MEGADROID
Dubstep 2012 (DubToxic Mix) BLASTOID N MEGADROID
DATE: 2011/03/12::
7
Blastoid Variant
Blastoid Variant
DATE: 2014/08/08::
8
Blastoid-Booger sugar
Blastoid-Booger sugar
DATE: 2012/03/05::
9
Blastoids - Morning Light
Blastoids - Morning Light
DATE: 2010/11/15::
10
Blastoid, Gov. Rick Perry and Hasidic Jews at the same party!
Blastoid, Gov. Rick Perry and Hasidic Jews at the same party!
DATE: 2011/09/26::
11
Phantasy Star II - Infinite Blastoid Grinding
Phantasy Star II - Infinite Blastoid Grinding
DATE: 2014/02/23::
12
Dubstep 2012 (Dubsgusting Mix) MEGADOID N BLASTOID
Dubstep 2012 (Dubsgusting Mix) MEGADOID N BLASTOID
DATE: 2011/03/05::
13
BLASTOID @the moose
BLASTOID @the moose
DATE: 2014/05/11::
14
blastoid 3D 1995
blastoid 3D 1995
DATE: 2010/04/09::
15
BLASTOID BLASTOID.wmv
BLASTOID BLASTOID.wmv
DATE: 2011/11/09::
16
Day 19 - Blastoid or Indolent?
Day 19 - Blastoid or Indolent?
DATE: 2014/08/21::
17
BLASTOID "I Hate My Job"
BLASTOID "I Hate My Job"
DATE: 2012/02/27::
18
Blastoid
Blastoid
DATE: 2011/03/28::
19
Blastoid-Self sustained existence
Blastoid-Self sustained existence
DATE: 2012/02/27::
20
LaLaByzZz Pres. [PLL]Blastoid Lightshow @ 420Fest 2010
LaLaByzZz Pres. [PLL]Blastoid Lightshow @ 420Fest 2010
DATE: 2010/04/27::
21
Jessy Matador - Bombastic ( Remixed By Blastoid DJ Cuchito Mix )
Jessy Matador - Bombastic ( Remixed By Blastoid DJ Cuchito Mix )
DATE: 2011/10/06::
22
Blastoid -self sustained existance live 3-29-12 @ billy o
Blastoid -self sustained existance live 3-29-12 @ billy o's
DATE: 2012/03/30::
23
Blastoid-All Riot
Blastoid-All Riot
DATE: 2012/03/06::
24
Jay-D - Blastoid (Original Mix)
Jay-D - Blastoid (Original Mix)
DATE: 2015/03/19::
25
Blastoid - Yayo Nigga Rachi
Blastoid - Yayo Nigga Rachi
DATE: 2012/05/21::
26
Dillon and Kat Thrashing to BLASTOID!
Dillon and Kat Thrashing to BLASTOID!
DATE: 2012/01/12::
27
BLASTOID  happier than you
BLASTOID happier than you'll ever be
DATE: 2011/11/09::
28
4-14-12 blastoid- blastoid
4-14-12 blastoid- blastoid
DATE: 2012/04/15::
29
Blastoid (Original Mix)
Blastoid (Original Mix)
DATE: 2015/03/19::
30
4-14-12 Blastoid- skate and thrash
4-14-12 Blastoid- skate and thrash
DATE: 2012/04/16::
31
Blastoid-I hate my job
Blastoid-I hate my job
DATE: 2012/03/06::
32
LaLaByzZz Pres. [PLL]Blastoid Lightshow @ Utopia After Party 2010
LaLaByzZz Pres. [PLL]Blastoid Lightshow @ Utopia After Party 2010
DATE: 2010/05/18::
33
Saving Captain Blastoid
Saving Captain Blastoid
DATE: 2009/01/24::
34
4-14-12 Blastoid- Choking on air
4-14-12 Blastoid- Choking on air
DATE: 2012/04/16::
35
Blastoid-"Blastoid" live 3-29-12 @ billy
Blastoid-"Blastoid" live 3-29-12 @ billy'os
DATE: 2012/03/30::
36
Blastoid - Self-Sustained Existence
Blastoid - Self-Sustained Existence
DATE: 2013/03/18::
37
Blastoid-Blastoid
Blastoid-Blastoid
DATE: 2012/03/06::
38
4-14-12 Blastoid- Booger sugar
4-14-12 Blastoid- Booger sugar
DATE: 2012/04/15::
39
4-14-12 Blastoid- all riot
4-14-12 Blastoid- all riot
DATE: 2012/04/15::
40
BLASTOID  Skate&thrash
BLASTOID Skate&thrash
DATE: 2011/11/09::
41
Blastoid-booger sugar live 3-29-12 ...live @ billy o
Blastoid-booger sugar live 3-29-12 ...live @ billy o's
DATE: 2012/03/30::
42
Part 1: Blastoid meets Friends
Part 1: Blastoid meets Friends
DATE: 2013/01/04::
43
Where the Hell is Captain Blastoid (Revised)
Where the Hell is Captain Blastoid (Revised)
DATE: 2009/02/01::
44
Blastoid at Billy O
Blastoid at Billy O's July 20, 2012
DATE: 2012/07/21::
45
Blastoid-choking on air ....live 3-29-12...@ billy o
Blastoid-choking on air ....live 3-29-12...@ billy o's
DATE: 2012/03/30::
46
MEGA BLASTOID!11
MEGA BLASTOID!11
DATE: 2013/11/22::
47
Blastoid -happier than youll ever be... live 3-29-12 @ billy
Blastoid -happier than youll ever be... live 3-29-12 @ billy 'os
DATE: 2012/03/30::
48
4-14-12 Blastoid- self sustained existence
4-14-12 Blastoid- self sustained existence
DATE: 2012/04/16::
49
4-14-12 Blastoid- i hate my job
4-14-12 Blastoid- i hate my job
DATE: 2012/04/16::
50
Blastoid
Blastoid
DATE: 2014/09/24::
NEXT >>
RESULTS [51 .. 101]
From Wikipedia, the free encyclopedia
  (Redirected from Blastoidea)
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Blastoids
Temporal range: Ordovician - Permian
Blastoids.jpg
Blastoid fossils (thecae) attached to matrix.
Scientific classification
Kingdom: Animalia
Phylum: Echinodermata
Subphylum: Blastozoa
Class: Blastoidea
Say, 1825
Orders

Fissiculata
Spiraculata
Incertae sedis:
Macurdablastus

"Blastoidea", from Ernst Haeckel's Art Forms of Nature, 1904

Blastoids (class Blastoidea) are an extinct type of stemmed echinoderm.[1] Often called sea buds, blastoid fossils look like small hickory nuts. They first appear, along with many other echinoderm classes, in the Ordovician period, and reached their greatest diversity in the Mississippian subperiod of the Carboniferous period. However, blastoids may have originated in the Cambrian. Blastoids persisted until their extinction at the end of Permian, about 250 million years ago. Although never as diverse as their contemporary relatives, the crinoids, blastoids are common fossils, especially in many Mississippian-age rocks.

Description[edit]

Like most echinoderms, blastoids were protected by a set of interlocking plates of calcium carbonate, which formed the main body, or theca. In life, the theca of a typical blastoid was attached to a stalk or column made up of stacked disc-shaped plates. The other end of the column was attached to the ocean floor by a holdfast, very much like stalked crinoids. The stalk was usually relatively short, and in some species, was absent, with the holdfast being attached directly to the base of the theca.

The mouth was located at the summit of the theca. Radiating like flower petals from the center were five food grooves, or ambulacra. Each ambulacrum had many long, thin, fine structures called brachioles, which were used to trap food particles and bring them to the mouth. Brachioles were delicate structures, and in fossils are not usually preserved in place. A series of five spiracle plates surrounded the star-shaped mouth, which included the anus, mouth and entrances to a set of five complex, folded respiratory organs known as hydrospires. These spiracles prevented mixing of the various fluids. Waste elimination was through the anispiracle, an opening formed by the fusing of anus and adjacent spiracles.

Like crinoids, blastoids were high-level, stalked suspension feeders (feeding mainly on planktonic organisms) that inhabited clear-to-silty, moderately agitated ocean waters from shelf to basin. The food gathering system of blastoids consisted of several types of ambulacra. Food entered the brachiolar ambulacra, was transferred to the side ambulacra through the brachiolar pit, then transferred to the main (median) ambulacra, and finally entered the mouth. Each of these ambulacra was roofed by cover plates. The cover plates of the brachiolar groove were movable and could open, allowing food to enter, or close as needed. Other cover plates may also have been movable.

Taxonomy[edit]

Blastoids are assumed to have evolved from the Cystoids.[2] Blastoids are subdivided into two orders: Fissiculata, which are characterized by direct entrance to the individual hydrospires by way of slits; and Spiraculata, which are characterized by indirect entrance to the hydrospires through canals by way of pores. The earliest blastoid yet found, Macurdablastus from the Middle Ordovician of Tennessee, cannot be classified as either order.

References[edit]

  1. ^ Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 1010. ISBN 0-03-056747-5. 
  2. ^ Palaeobiology and Biodiversity Research Group: Blastoids

External links[edit]

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