1
pokemon kid
pokemon kid
DATE: 2008/11/24::
2
Blastoid - Obliterate
Blastoid - Obliterate
DATE: 2013/03/18::
3
Blastoid at The Basement
Blastoid at The Basement
DATE: 2014/04/09::
4
Blastoids - Show Me Around
Blastoids - Show Me Around
DATE: 2011/01/14::
5
Unknown blastoid
Unknown blastoid
DATE: 2014/08/06::
6
JAY-D - Blastoid (Original Mix)
JAY-D - Blastoid (Original Mix)
DATE: 2015/03/19::
7
018 - Blastoids - Big Idea
018 - Blastoids - Big Idea
DATE: 2011/05/13::
8
Blastoids - Morning Light
Blastoids - Morning Light
DATE: 2010/11/15::
9
Blastoid Variant
Blastoid Variant
DATE: 2014/08/08::
10
Dubstep 2012 (DubToxic Mix) BLASTOID N MEGADROID
Dubstep 2012 (DubToxic Mix) BLASTOID N MEGADROID
DATE: 2011/03/12::
11
Mistah Bohze bLASToid mcgONagle Album Sampler 2012
Mistah Bohze bLASToid mcgONagle Album Sampler 2012
DATE: 2012/01/19::
12
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::
13
Jessy Matador - Bombastic ( Remixed By Blastoid DJ Cuchito Mix )
Jessy Matador - Bombastic ( Remixed By Blastoid DJ Cuchito Mix )
DATE: 2011/10/06::
14
blastoid 3D 1995
blastoid 3D 1995
DATE: 2010/04/09::
15
Dubstep 2012 (Dubsgusting Mix) MEGADOID N BLASTOID
Dubstep 2012 (Dubsgusting Mix) MEGADOID N BLASTOID
DATE: 2011/03/05::
16
Electro House 2012 (No Left Turn Mix) MEGADROID N BLASTOIDS
Electro House 2012 (No Left Turn Mix) MEGADROID N BLASTOIDS
DATE: 2010/12/27::
17
BLASTOID @the moose
BLASTOID @the moose
DATE: 2014/05/11::
18
BLASTOID "I Hate My Job"
BLASTOID "I Hate My Job"
DATE: 2012/02/27::
19
Phantasy Star II - Infinite Blastoid Grinding
Phantasy Star II - Infinite Blastoid Grinding
DATE: 2014/02/23::
20
Blastoid
Blastoid
DATE: 2011/03/28::
21
Blastoid - Yayo Nigga Rachi
Blastoid - Yayo Nigga Rachi
DATE: 2012/05/21::
22
Dillon and Kat Thrashing to BLASTOID!
Dillon and Kat Thrashing to BLASTOID!
DATE: 2012/01/12::
23
LaLaByzZz Pres. [PLL]Blastoid Lightshow @ 420Fest 2010
LaLaByzZz Pres. [PLL]Blastoid Lightshow @ 420Fest 2010
DATE: 2010/04/27::
24
LaLaByzZz Pres. [PLL]Blastoid Lightshow @ Utopia After Party 2010
LaLaByzZz Pres. [PLL]Blastoid Lightshow @ Utopia After Party 2010
DATE: 2010/05/18::
25
Part 1: Blastoid meets Friends
Part 1: Blastoid meets Friends
DATE: 2013/01/04::
26
Blastoid at Billy O
Blastoid at Billy O's July 20, 2012
DATE: 2012/07/21::
27
Blastoid (Original Mix)
Blastoid (Original Mix)
DATE: 2015/03/19::
28
Blastoid
Blastoid
DATE: 2014/09/24::
29
Madagascar The Game Music - Marty
Madagascar The Game Music - Marty's Escape (Super Space Blastoid)
DATE: 2014/07/06::
30
Invasion: Blastoids +150k score Part 1
Invasion: Blastoids +150k score Part 1
DATE: 2011/12/24::
31
Blastoid- change sorry crash
Blastoid- change sorry crash
DATE: 2015/06/30::
32
Kentucky Blastoids
Kentucky Blastoids
DATE: 2015/05/02::
33
Electro House 2012 (ILLUMINATI KIDZ MIX) MEGADROID N BLASTOIDS
Electro House 2012 (ILLUMINATI KIDZ MIX) MEGADROID N BLASTOIDS
DATE: 2010/12/03::
34
Dubstep 2012 Phsyco Mix MEGADROID N BLASTOIDS
Dubstep 2012 Phsyco Mix MEGADROID N BLASTOIDS
DATE: 2011/03/13::
35
Death battle: Charizard, blastoid, Venusuar, who will win?
Death battle: Charizard, blastoid, Venusuar, who will win?
DATE: 2014/05/28::
36
Blastoids - Kids and Candy
Blastoids - Kids and Candy
DATE: 2010/05/10::
37
Blastoids - Morning light @ Brooklyn Fireproof
Blastoids - Morning light @ Brooklyn Fireproof
DATE: 2011/08/10::
38
daniel gott blastoids
daniel gott blastoids
DATE: 2009/10/18::
39
MEGADROID N BLASTOIDS Straight 2 Da Dom MIX!! (Beyond Sex)
MEGADROID N BLASTOIDS Straight 2 Da Dom MIX!! (Beyond Sex)
DATE: 2010/11/26::
40
Blastoids - The Mountain (Kodak to Graph Remix)
Blastoids - The Mountain (Kodak to Graph Remix)
DATE: 2013/03/05::
41
miSTAh bOhZE - Soul U GotZ?
miSTAh bOhZE - Soul U GotZ?
DATE: 2012/02/15::
42
Blastoids in the Studio
Blastoids in the Studio
DATE: 2008/09/18::
43
blastoids
blastoids
DATE: 2008/07/27::
44
BLASTOIDS FROM BELGIUM
BLASTOIDS FROM BELGIUM
DATE: 2008/01/16::
45
Blastoid2.wmv
Blastoid2.wmv
DATE: 2008/11/29::
46
Blastoids @ I Can Fly House 2 (6/28/09)
Blastoids @ I Can Fly House 2 (6/28/09)
DATE: 2009/07/01::
47
MDNBZ - ULTIMATE RAW MIX
MDNBZ - ULTIMATE RAW MIX
DATE: 2011/02/12::
48
Poke-pixel Art: Blastoise
Poke-pixel Art: Blastoise
DATE: 2013/07/07::
49
Bring Me The Horizon-SUICIDE SEASON-(BLASTOIDZ REMIX)
Bring Me The Horizon-SUICIDE SEASON-(BLASTOIDZ REMIX)
DATE: 2011/05/13::
50
Two Story Roof Nutshot Gone Wrong! Breaks Ribs & Poops Himself!
Two Story Roof Nutshot Gone Wrong! Breaks Ribs & Poops Himself!
DATE: 2012/10/01::
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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