Play Video
1
Blastoid at The Basement
Blastoid at The Basement
::2014/04/09::
Play Video
2
pokemon kid
pokemon kid
::2008/11/24::
Play Video
3
Blastoid - Obliterate
Blastoid - Obliterate
::2013/03/18::
Play Video
4
Dubstep 2012 (DubToxic Mix) BLASTOID N MEGADROID
Dubstep 2012 (DubToxic Mix) BLASTOID N MEGADROID
::2011/06/25::
Play Video
5
Unknown blastoid
Unknown blastoid
::2014/08/06::
Play Video
6
Blastoids - Show Me Around
Blastoids - Show Me Around
::2011/01/14::
Play Video
7
Blastoid Variant
Blastoid Variant
::2014/08/08::
Play Video
8
Blastoid tin opening
Blastoid tin opening
::2014/11/18::
Play Video
9
Mistah Bohze bLASToid mcgONagle Album Sampler 2012
Mistah Bohze bLASToid mcgONagle Album Sampler 2012
::2012/01/19::
Play Video
10
Phantasy Star II - Infinite Blastoid Grinding
Phantasy Star II - Infinite Blastoid Grinding
::2014/02/23::
Play Video
11
Dubstep 2012 (Dubsgusting Mix) MEGADOID N BLASTOID
Dubstep 2012 (Dubsgusting Mix) MEGADOID N BLASTOID
::2011/03/05::
Play Video
12
BLASTOID BLASTOID.wmv
BLASTOID BLASTOID.wmv
::2011/11/09::
Play Video
13
Jessy Matador - Bombastic ( Remixed By Blastoid DJ Cuchito Mix )
Jessy Matador - Bombastic ( Remixed By Blastoid DJ Cuchito Mix )
::2011/10/06::
Play Video
14
Blastoid, Gov. Rick Perry and Hasidic Jews at the same party!
Blastoid, Gov. Rick Perry and Hasidic Jews at the same party!
::2011/09/26::
Play Video
15
Day 19 - Blastoid or Indolent?
Day 19 - Blastoid or Indolent?
::2014/08/21::
Play Video
16
BLASTOID @the moose
BLASTOID @the moose
::2014/05/11::
Play Video
17
Blastoid -self sustained existance live 3-29-12 @ billy o
Blastoid -self sustained existance live 3-29-12 @ billy o's
::2012/03/30::
Play Video
18
Death battle: Charizard, blastoid, Venusuar, who will win?
Death battle: Charizard, blastoid, Venusuar, who will win?
::2014/05/28::
Play Video
19
Blastoid
Blastoid
::2011/03/28::
Play Video
20
LaLaByzZz Pres. [PLL]Blastoid Lightshow @ 420Fest 2010
LaLaByzZz Pres. [PLL]Blastoid Lightshow @ 420Fest 2010
::2010/04/27::
Play Video
21
LaLaByzZz Pres. [PLL]Blastoid Lightshow @ Utopia After Party 2010
LaLaByzZz Pres. [PLL]Blastoid Lightshow @ Utopia After Party 2010
::2010/05/18::
Play Video
22
Blastoid-Self sustained existence
Blastoid-Self sustained existence
::2012/02/27::
Play Video
23
BLASTOID  happier than you
BLASTOID happier than you'll ever be
::2011/11/09::
Play Video
24
blastoid 3D 1995
blastoid 3D 1995
::2010/04/09::
Play Video
25
4-14-12 Blastoid- Choking on air
4-14-12 Blastoid- Choking on air
::2012/04/16::
Play Video
26
Blastoid-All Riot
Blastoid-All Riot
::2012/03/06::
Play Video
27
Blastoid - Yayo Nigga Rachi
Blastoid - Yayo Nigga Rachi
::2012/05/21::
Play Video
28
Blastoid-booger sugar live 3-29-12 ...live @ billy o
Blastoid-booger sugar live 3-29-12 ...live @ billy o's
::2012/03/30::
Play Video
29
BLASTOID "I Hate My Job"
BLASTOID "I Hate My Job"
::2012/02/27::
Play Video
30
Electro House 2012 (No Left Turn Mix) MEGADROID N BLASTOIDS
Electro House 2012 (No Left Turn Mix) MEGADROID N BLASTOIDS
::2010/12/27::
Play Video
31
4-14-12 blastoid- blastoid
4-14-12 blastoid- blastoid
::2012/04/15::
Play Video
32
Dillon and Kat Thrashing to BLASTOID!
Dillon and Kat Thrashing to BLASTOID!
::2012/01/12::
Play Video
33
Blastoid - Self-Sustained Existence
Blastoid - Self-Sustained Existence
::2013/03/18::
Play Video
34
Blastoid-"Blastoid" live 3-29-12 @ billy
Blastoid-"Blastoid" live 3-29-12 @ billy'os
::2012/03/30::
Play Video
35
Blastoid-Blastoid
Blastoid-Blastoid
::2012/03/06::
Play Video
36
4-14-12 Blastoid- skate and thrash
4-14-12 Blastoid- skate and thrash
::2012/04/16::
Play Video
37
Saving Captain Blastoid
Saving Captain Blastoid
::2009/01/24::
Play Video
38
Blastoid
Blastoid
::2014/11/08::
Play Video
39
Blastoid-I hate my job
Blastoid-I hate my job
::2012/03/06::
Play Video
40
Blastoid at Billy O
Blastoid at Billy O's July 20, 2012
::2012/07/21::
Play Video
41
4-14-12 Blastoid- all riot
4-14-12 Blastoid- all riot
::2012/04/15::
Play Video
42
Invasion: Blastoids +150k score Part 1
Invasion: Blastoids +150k score Part 1
::2011/12/24::
Play Video
43
Blastoid-Booger sugar
Blastoid-Booger sugar
::2012/03/04::
Play Video
44
4-14-12 Blastoid- Booger sugar
4-14-12 Blastoid- Booger sugar
::2012/04/15::
Play Video
45
BLASTOID @billy o
BLASTOID @billy o's 12-23-11 "Santa Susana Meltdown"
::2011/12/30::
Play Video
46
BLASTOID  Skate&thrash
BLASTOID Skate&thrash
::2011/11/09::
Play Video
47
Where the Hell is Captain Blastoid (Revised)
Where the Hell is Captain Blastoid (Revised)
::2009/02/01::
Play Video
48
MEGA BLASTOID!11
MEGA BLASTOID!11
::2013/11/22::
Play Video
49
Blastoid @ Billy O
Blastoid @ Billy O's 12-23-11 "Happier Than You'll Ever Be"
::2011/12/26::
Play Video
50
Blastoid Remix - Yayo Nigga Rachi ft Amaziin Boii F.P.
Blastoid Remix - Yayo Nigga Rachi ft Amaziin Boii F.P.
::2012/05/08::
NEXT >>
RESULTS [51 .. 101]
From Wikipedia, the free encyclopedia
  (Redirected from Blastoidea)
Jump to: navigation, search
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]

Wikipedia content is licensed under the GFDL License
Powered by YouTube
MASHPEDIA
LEGAL
  • Mashpedia © 2014