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Wild blastoid Pokemon caught
Wild blastoid Pokemon caught
Published: 2017/04/15
Channel: DoiXunu
Trials of the Blood Dragon (OST) / Power Glove - Blastoid
Trials of the Blood Dragon (OST) / Power Glove - Blastoid
Published: 2016/06/14
Channel: Ubisoft Music UBILOUD
pokemon kid
pokemon kid
Published: 2008/11/24
Channel: Danny Dixon
Kentucky Blastoids
Kentucky Blastoids
Published: 2015/05/02
Channel: Snot Otter
Dubstep 2012 (DubToxic Mix) BLASTOID N MEGADROID
Dubstep 2012 (DubToxic Mix) BLASTOID N MEGADROID
Published: 2011/03/13
Channel: DarkStar1503
Pokemon  unboxing  Blastoid ex box Ex
Pokemon unboxing Blastoid ex box Ex
Published: 2016/08/04
Channel: lava man
blastoid
blastoid
Published: 2017/05/07
Channel: John Granholm
BLASTOID  happier than you
BLASTOID happier than you'll ever be
Published: 2011/11/10
Channel: SprayCansAndJoints
Blastoid
Blastoid's Complete Guide to Dark Souls 3 PvP
Published: 2016/05/01
Channel: Blastoid
Charizard vs blastoid
Charizard vs blastoid
Published: 2017/04/29
Channel: the galaxy
Blastoid @ Billy O
Blastoid @ Billy O's 12-23-11 "Happier Than You'll Ever Be"
Published: 2011/12/26
Channel: SprayCansAndJoints
Blastoids- Paleozoic Extinct Echinoderms
Blastoids- Paleozoic Extinct Echinoderms
Published: 2013/08/08
Channel: Ron Schmidtling
BLASTOID "I Hate My Job"
BLASTOID "I Hate My Job"
Published: 2012/02/28
Channel: doctordude
4-14-12 Blastoid- i hate my job
4-14-12 Blastoid- i hate my job
Published: 2012/04/16
Channel: SprayCansAndJoints
Blastoid-I hate my job
Blastoid-I hate my job
Published: 2012/03/06
Channel: SprayCansAndJoints
Day 19 - Blastoid or Indolent?
Day 19 - Blastoid or Indolent?
Published: 2014/08/21
Channel: Steve Edwards
Blastoid Variant
Blastoid Variant
Published: 2014/08/09
Channel: Steve Edwards
Super Space Blastoid 1977
Super Space Blastoid 1977
Published: 2017/09/23
Channel: Codrut
BLASTOID BLASTOID.wmv
BLASTOID BLASTOID.wmv
Published: 2011/11/10
Channel: SprayCansAndJoints
4-14-12 Blastoid- Choking on air
4-14-12 Blastoid- Choking on air
Published: 2012/04/16
Channel: SprayCansAndJoints
blastoid 3D 1995
blastoid 3D 1995
Published: 2010/04/09
Channel: Ron Schmidtling
4-14-12 Blastoid- Booger sugar
4-14-12 Blastoid- Booger sugar
Published: 2012/04/16
Channel: SprayCansAndJoints
Blastoid
Blastoid
Published: 2017/07/17
Channel: Demcon Nymus3D
Blastoid - Yayo Nigga Rachi
Blastoid - Yayo Nigga Rachi
Published: 2012/05/21
Channel: Amaziin Boii F.P.
Dubstep 2012 (Dubsgusting Mix) MEGADOID N BLASTOID
Dubstep 2012 (Dubsgusting Mix) MEGADOID N BLASTOID
Published: 2011/03/05
Channel: DarkStar1503
BLASTOID @the moose
BLASTOID @the moose
Published: 2014/05/11
Channel: AVHC Beaver
Madagascar The Game Soundtrack (HQ) - Marty
Madagascar The Game Soundtrack (HQ) - Marty's Escape |Super Space Blastoid|
Published: 2017/05/31
Channel: 「 TheMygoshi 」[Video Game Soundtrack]
Blastoid-Booger sugar
Blastoid-Booger sugar
Published: 2012/03/05
Channel: throatcancer8
Mistah Bohze bLASToid mcgONagle Album Sampler 2012
Mistah Bohze bLASToid mcgONagle Album Sampler 2012
Published: 2012/01/19
Channel: southside deluxe
Blastoid and domo meet
Blastoid and domo meet
Published: 2009/11/30
Channel: Stacy Cuellar
Unknown blastoid
Unknown blastoid
Published: 2014/08/06
Channel: Nidia Alvarez Armada
Blastoid-Self sustained existence
Blastoid-Self sustained existence
Published: 2012/02/28
Channel: SprayCansAndJoints
Where the Hell is Captain Blastoid (Revised)
Where the Hell is Captain Blastoid (Revised)
Published: 2009/02/02
Channel: yozhov
Blastoid Respiration and Evolution
Blastoid Respiration and Evolution
Published: 2017/10/13
Channel: Jen Bauer
Blastoid
Blastoid
Published: 2011/03/28
Channel: Paul Boland
Blastoids - Kids and Candy
Blastoids - Kids and Candy
Published: 2010/05/10
Channel: Angelo De Lutiis
Saving Captain Blastoid
Saving Captain Blastoid
Published: 2009/01/24
Channel: Doug Orleans
4-14-12 blastoid- blastoid
4-14-12 blastoid- blastoid
Published: 2012/04/16
Channel: SprayCansAndJoints
Phantasy Star II - Infinite Blastoid Grinding
Phantasy Star II - Infinite Blastoid Grinding
Published: 2014/02/23
Channel: VerticalSandwich
Blastoid
Blastoid
Published: 2016/06/12
Channel: Power Glove - Topic
Blastoid vs  Charzard
Blastoid vs Charzard
Published: 2015/07/29
Channel: CDM Innovation Station
Blastoid tin opening
Blastoid tin opening
Published: 2014/11/19
Channel: OYSABANDIT !!!!!!
Blastoid @Whiskeys SB 11/28/12
Blastoid @Whiskeys SB 11/28/12
Published: 2012/12/22
Channel: Electric SEX Enterprises
Blastoid (Original Mix)
Blastoid (Original Mix)
Published: 2015/03/19
Channel: Various Artists - Topic
Blastoid-"Blastoid" live 3-29-12 @ billy
Blastoid-"Blastoid" live 3-29-12 @ billy'os
Published: 2012/03/30
Channel: SprayCansAndJoints
4-14-12 Blastoid- self sustained existence
4-14-12 Blastoid- self sustained existence
Published: 2012/04/16
Channel: SprayCansAndJoints
Blastoid-All Riot
Blastoid-All Riot
Published: 2012/03/06
Channel: SprayCansAndJoints
blastoid the idiot trailer
blastoid the idiot trailer
Published: 2016/05/13
Channel: um fã de HL 'Mike S.'
4-14-12 Blastoid- skate and thrash
4-14-12 Blastoid- skate and thrash
Published: 2012/04/16
Channel: SprayCansAndJoints
TAO 2010 - Blastoid in the House (Edited)
TAO 2010 - Blastoid in the House (Edited)
Published: 2010/02/01
Channel: Ralfiedee
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
  (Redirected from Blastoidea)
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Blastoids
Temporal range: Ordovician - Permian
Pentremites Glen Dean Fm KY.jpg
Pentremites godoni, a blastoid from the Lower Carboniferous of Illinois.
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.

Pentremites godoni, a blastoid from the Lower Carboniferous of Illinois; basal view of theca.

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. 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. 

External links[edit]

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