33:
55:
509:. When the sea star has its prey, it extends the stomach to envelope the prey. Once the prey is enveloped, it then retracts back into the disc, and transfers it to the pyloric stomach for further digestion. The pyloric stomach has two extensions into each arm called the
556:
has a circulatory system that forms three rings of vessels. They are called the hyponeural haemal ring, the gastric ring, and the genital ring. The heart beats six times every minute and connects all three vessels. At the base of each ray, there is a pair of
295:
is a stable gonochoric. The sea star usually reproduces during
February and May. The sea stars migrate to warm, shallow water during the breeding season. The sea stars mate through disk fusion. The eggs are then kept under the disk of the female starfish to
368:
side, the rays are rough with groupings of spinelets, each one have three to six glassy points. The sides of the rays are curving and smooth. The rays contain many of the organs in the sea star. On the tips of the rays are the eyespots. These are dark
338:. It reproduces asexually through the process of regeneration. The sea star can go through regeneration if the disc is split in half, or even if a ray is cut off. The regeneration process takes weeks to months to complete.
449:
pumps filtered seawater in and out of its body. This seawater is transported through a vascular tube system, and delivers nutrients to the different organs and helps in gas exchange. Water enters through the
432:. The motor system is responsible for movement and functioning and the sensory system is responsible for controlling the sensory organs. Both of these systems run up and down the arms, and around the disc.
517:
into the pyloric stomach. Then, the waste is transported through a short intestine, and rectum. The material that is left is secreted through a small anus on the oral side of the disc.
607:
has no negative or positive impact on humans. The sea star is not harmful to humans or the economy, and only may slightly affect the tourist industry with its bright colors.
978:
927:
798:
403:. the tube foot rows are sensitive to chemicals enabling the sea star to detect chemical trails left by possible food. The tube foot rows also excrete waste
572:
shows behavioral adaptations in addition to physical ones. The sea star is usually seen with sponges and coral, using the currents they make to feed upon
428:. The sea star has no capacity for planning. The nervous system has two parts. They are motor system and the sensory system which are interconnected by
580:
is also one of the only species of sea stars that broods its eggs. The female stays with the eggs while they hatch, and continues to stay with them as
914:
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230:. The sea star is almost always found near sponges and coral because of the currents they create, making it easier for the sea star to filter feed.
759:
203:, also known as "bloody Henry", and the two can only be distinguished by laboratory tests. It comes in colors of red, yellow, orange, purple, and
824:
973:
387:
The tube foot rows are on the oral side of the rays. Each ray has two tube foot rows. The tube foot rows are attached to the rays by
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is an invertebrate. It has slender five rays that taper evenly to tips that are connected by a central disc. The sea star grows to a
940:
873:
335:
399:. The tube foot rows help the sea star stick to its prey, and to bring the prey to its mouth. The tube foot rows also aid in
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785:
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624:
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54:
218:
is found in the North
Atlantic and North Pacific oceans. The sea star can be seen on the beach, under rocks, in
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shape created by the female's arms until they are ready to go into the ocean on their own. Until spring time,
968:
505:. The cardiac stomach is on the oral side, in the center of the disc. It is covered by a thin membrane and
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699:
616:
149:
32:
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878:
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onto them, and then stays on top of the eggs for three weeks while they hatch. The sea stars are
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floating in the water, and uses currents made by sponges or coral to make this process easier.
837:
707:
361:
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also doesn't react to the fluid of
Asterias forbesi, which is toxic to most other sea stars.
204:
199:
842:
811:
540:
502:
374:
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186:
116:
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510:
301:
190:
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400:
270:
227:
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occurs. After incubation, the female deposits its eggs on the ground, secretes
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309:
274:
219:
86:
506:
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408:
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organs that sense the presence of light. The rays also contain parts of the
250:
66:
816:
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of 5 to 12 centimeters. On the oral side, the rays are smooth and have an
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651:
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182:
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223:
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305:
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501:. The two stomachs are called the cardiac stomach, and the
445:, like all other sea stars, uses water instead of blood.
377:, parts of the nervous system, and most other organs.
889:
641:
539:is transported to the tips of the papulae using
8:
454:, a sieve-like structure on the oral side.
391:grooves. The Tube Foot Rows use a chemical
629:
234:is found from depths of 0 to 2414 meters.
31:
20:
364:that contains two tube foot rows. On the
226:. Its aquatic biomes are the coastal and
464:The body wall is composed of epidermis,
7:
334:can reproduce sexually, it can also
979:Taxa named by Otto Friedrich Müller
265:feeds on plankton, sponge tissue,
14:
253:. The sea star filter feeds upon
395:to stick to surfaces instead of
53:
1:
535:on the rays and disc. Waste
995:
974:Starfish described in 1776
513:. These secrete digestive
489:has two stomachs, a small
480:Digestive system/stomachs
318:diploid chromosome number
155:
148:
50:Scientific classification
48:
39:
30:
23:
543:, and is then excreted.
424:has no brain, but has a
177:, commonly known as the
592:lives a solitary life.
584:. The larvae stay in a
222:when available, and on
891:Asterias sanguinolenta
687:Henricia_sanguinolenta
673:Henricia sanguinolenta
643:Henricia sanguinolenta
605:Henricia sanguinolenta
594:Henricia sanguinolenta
590:Henricia sanguinolenta
578:Henricia sanguinolenta
570:Henricia sanguinolenta
554:Henricia sanguinolenta
487:Henricia sanguinolenta
476:myoepithelial layer.
447:Henricia sanguinolenta
443:Henricia sanguinolenta
422:Henricia sanguinolenta
354:Henricia sanguinolenta
332:Henricia sanguinolenta
314:Henricia sanguinolenta
293:Henricia sanguinolenta
243:Henricia sanguinolenta
232:Henricia sanguinolenta
216:Henricia sanguinolenta
195:Henricia sanguinolenta
174:Henricia sanguinolenta
159:Henricia sanguinolenta
42:Henricia sanguinolenta
25:Henricia sanguinolenta
141:H. sanguinolenta
531:are small are small
436:Vascular tube system
324:Asexual reproduction
191:North Pacific Oceans
336:reproduce asexually
286:Sexual reproduction
197:is very similar to
165:(O.F. Müller, 1776)
16:Species of starfish
547:Circulatory System
181:, is a species of
956:
955:
838:Open Tree of Life
635:Taxon identifiers
362:ambulacral groove
273:. It is eaten by
179:northern henricia
170:
169:
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600:Impact on humans
541:phagocytic cells
200:Henricia oculata
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375:pyloric stomach
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415:Nervous system
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381:Tube foot rows
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281:Reproduction
269:, and other
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851:SeaLifeBase
773:NatureServe
747:iNaturalist
667:Wikispecies
452:madreporite
275:vertebrates
247:planktivore
220:tidal pools
107:Spinulosida
963:Categories
906:Q119953720
611:References
389:ambulacral
310:polygamous
97:Asteroidea
507:sphincter
491:intestine
458:Body wall
409:diffusion
371:pigmented
330:Although
267:ascidians
251:carnivore
185:from the
135:Species:
73:Kingdom:
67:Eukaryota
44:sea star
933:10821357
900:Wikidata
778:2.973569
658:Q2462631
652:Wikidata
574:detritus
565:Behavior
493:, and a
474:coelomic
407:through
393:adhesive
358:diameter
298:incubate
263:Henricia
259:plankton
255:detritus
205:lavender
183:sea star
128:Henricia
113:Family:
83:Phylum:
77:Animalia
63:Domain:
920:5187388
866:4780110
739:5187337
537:ammonia
529:papulae
521:Papulae
515:enzymes
470:cuticle
468:, thin
430:neurons
405:ammonia
397:suction
342:Anatomy
320:of 36.
211:Habitat
123:Genus:
103:Order:
93:Class:
946:123780
879:123974
863:uBio:
830:123974
817:199515
765:157165
726:598501
700:220955
582:larvae
559:gonads
495:rectum
466:dermis
366:dorsal
316:has a
300:after
224:gravel
941:WoRMS
928:IRMNG
874:WoRMS
856:49524
843:60242
804:72675
752:62364
713:3KVF4
533:gills
306:mucus
245:is a
915:GBIF
825:OBIS
799:NCBI
760:ITIS
734:GBIF
695:BOLD
586:dome
527:The
499:anus
347:Rays
257:and
249:and
238:Diet
189:and
786:NBN
721:EoL
708:CoL
682:ADW
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193:.
40:A
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