{"id":12002,"date":"2019-12-16T16:44:38","date_gmt":"2019-12-16T21:44:38","guid":{"rendered":"https:\/\/ncseagrant.ncsu.edu\/coastwatch\/?page_id=12002"},"modified":"2024-08-20T13:43:05","modified_gmt":"2024-08-20T17:43:05","slug":"you-say-starfish-i-say-sea-star","status":"publish","type":"post","link":"https:\/\/ncseagrant.ncsu.edu\/coastwatch\/you-say-starfish-i-say-sea-star\/","title":{"rendered":"Sea Science: You Say Starfish, I Say Sea Star"},"content":{"rendered":"\n\n\n\n\n

Hopefully, your vacation plans will take you to a North Carolina seashore, where you can spend time wandering along the water\u2019s edge, contemplating the nearshore ocean universe.<\/p>\n\n\n\n

If you\u2019re lucky, maybe you\u2019ll find something special. Keep an eye out for starfish, sea stars, or asteroids \u2014 all common names for the star-shaped animals that are fun beachcombing finds. These creatures belong to the phylum Echinodermata<\/em>, whose name stems from the Latin words echinos<\/em>, for spiny (or hedgehog), and derma<\/em>, for skin. Echinoderms are spiny-skinned animals that also include brittle stars, sand dollars, sea urchins, and sea cucumbers.<\/p>\n\n\n\n

Echinoderms exhibit radial symmetry, meaning that they have a central part, with other parts arranged around that central axis. For a clearer idea of radial symmetry, think of a daisy \u2014 the white petals are arranged around the yellow center. Most sea stars have five arms, although some have seven, and some have 10 or more. The sunflower star, for example, may have up to 24 arms!<\/p>\n\n\n\n

The bottom of the sea star is called the oral surface, because that\u2019s where the mouth is. If you look at that side, you\u2019ll see tiny tube feet with suction cups that line each arm. Those sticky tube feet help the animal hold onto its prey \u2014 usually bivalves, like clams and scallops.<\/p>\n\n\n\n

The feet pull the mollusk\u2019s two shells apart just enough so that the sea star can extend its stomach from its mouth, located in a structure called the central disc, where all the arms meet. Digestive juices from the stomach dissolve the prey\u2019s body, which is then absorbed by the stomach\u2019s lining.<\/p>\n\n\n\n

Examine the sea star\u2019s central disc and you\u2019ll notice a structure called the madreporite, or sieve plate, which pulls water into the sea star\u2019s water vascular system. This hydraulic system channels water to the tube feet through canals. The combination of muscular contractions and changes in water pressure causes the tube feet to extend and contract, moving the sea star\u2019s body along the sandy bottom.<\/p>\n\n\n\n

The top side of the sea star is called the aboral side, because it\u2019s opposite the oral side. The bumpy-skinned aboral side is covered with loads of tiny pinchers called pedicellariae that help clean the rough surface.<\/p>\n\n\n\n

Although sea stars cannot see images, eyespots on the end of each arm enable them to see light, dark, and shadows.<\/p>\n\n\n\n

Sea stars have a pretty cool ability called regeneration. If a sea star loses one of its arms, it can regenerate, or regrow, that appendage, as long as part of the central disc is still attached. It may take a year to get back to full size.<\/p>\n\n\n\n

\"\"<\/a>
Scientists, naturalists, and educators now call these echinoderms \u201csea stars\u201d rather than starfish, because they lack scales, don\u2019t swim, and aren\u2019t actually fish. Paul Morris\/CC BY-SA 2.0.<\/em><\/figcaption><\/figure>\n\n\n\n

Most scientists, naturalists, and aquarium educators now refer to these echinoderms as \u201csea stars\u201d rather than starfish, since they do not have scales, they do not swim, and they are not \u201cfish,\u201d even though they live in water. Common names can differ from region to region, and from state to state.<\/p>\n\n\n\n

If you want to know the scientific name of an animal, you must check the binomial, or two name, classification system developed in the early 1700s by Carolus Linnaeus.<\/p>\n\n\n\n

According to Linnaeus, our common sea star, also called Forbes\u2019 sea star, is classified this way:<\/p>\n\n\n\n

Kingdom: <\/strong>Animalia<\/p>\n\n\n\n

Phylum: <\/strong>Echinodermata<\/p>\n\n\n\n

Class: <\/strong>Asteroidea<\/p>\n\n\n\n

Order: <\/strong>Forcipulatida<\/p>\n\n\n\n

Family: <\/strong>Asteriidae<\/p>\n\n\n\n

Genus: <\/strong>Asterias <\/em><\/p>\n\n\n\n

Species: <\/strong>Asterias forbesi <\/em><\/p>\n\n\n\n

But remember: Scientific names also change from time to time, as in the case of a well-known smooth cordgrass found in North Carolina.<\/p>\n\n\n\n

Read the smooth cordgrass story<\/a>. <\/em><\/p>\n\n\n\n

Terri Kirby Hathaway is a marine education specialist at North Carolina Sea Grant. Three times a year she publishes Scotch Bonnet, a compilation of professional development workshops and resources for North Carolina educators. The latest issue is always available here<\/a>. <\/em><\/p>\n\n\n

Related<\/h2>
\n Winter 2019 Issue<\/span>\n\t\t\t\n\t\t\t\n\t\t<\/svg><\/span>\n <\/a>\n <\/div><\/div>\n\n","protected":false,"raw":"\n\n\n\n\n

Hopefully, your vacation plans will take you to a North Carolina seashore, where you can spend time wandering along the water\u2019s edge, contemplating the nearshore ocean universe.<\/p>\n\n\n\n

If you\u2019re lucky, maybe you\u2019ll find something special. Keep an eye out for starfish, sea stars, or asteroids \u2014 all common names for the star-shaped animals that are fun beachcombing finds. These creatures belong to the phylum Echinodermata<\/em>, whose name stems from the Latin words echinos<\/em>, for spiny (or hedgehog), and derma<\/em>, for skin. Echinoderms are spiny-skinned animals that also include brittle stars, sand dollars, sea urchins, and sea cucumbers.<\/p>\n\n\n\n

Echinoderms exhibit radial symmetry, meaning that they have a central part, with other parts arranged around that central axis. For a clearer idea of radial symmetry, think of a daisy \u2014 the white petals are arranged around the yellow center. Most sea stars have five arms, although some have seven, and some have 10 or more. The sunflower star, for example, may have up to 24 arms!<\/p>\n\n\n\n

The bottom of the sea star is called the oral surface, because that\u2019s where the mouth is. If you look at that side, you\u2019ll see tiny tube feet with suction cups that line each arm. Those sticky tube feet help the animal hold onto its prey \u2014 usually bivalves, like clams and scallops.<\/p>\n\n\n\n

The feet pull the mollusk\u2019s two shells apart just enough so that the sea star can extend its stomach from its mouth, located in a structure called the central disc, where all the arms meet. Digestive juices from the stomach dissolve the prey\u2019s body, which is then absorbed by the stomach\u2019s lining.<\/p>\n\n\n\n

Examine the sea star\u2019s central disc and you\u2019ll notice a structure called the madreporite, or sieve plate, which pulls water into the sea star\u2019s water vascular system. This hydraulic system channels water to the tube feet through canals. The combination of muscular contractions and changes in water pressure causes the tube feet to extend and contract, moving the sea star\u2019s body along the sandy bottom.<\/p>\n\n\n\n

The top side of the sea star is called the aboral side, because it\u2019s opposite the oral side. The bumpy-skinned aboral side is covered with loads of tiny pinchers called pedicellariae that help clean the rough surface.<\/p>\n\n\n\n

Although sea stars cannot see images, eyespots on the end of each arm enable them to see light, dark, and shadows.<\/p>\n\n\n\n

Sea stars have a pretty cool ability called regeneration. If a sea star loses one of its arms, it can regenerate, or regrow, that appendage, as long as part of the central disc is still attached. It may take a year to get back to full size.<\/p>\n\n\n\n

\"\"<\/a>
Scientists, naturalists, and educators now call these echinoderms \u201csea stars\u201d rather than starfish, because they lack scales, don\u2019t swim, and aren\u2019t actually fish. Paul Morris\/CC BY-SA 2.0.<\/em><\/figcaption><\/figure>\n\n\n\n

Most scientists, naturalists, and aquarium educators now refer to these echinoderms as \u201csea stars\u201d rather than starfish, since they do not have scales, they do not swim, and they are not \u201cfish,\u201d even though they live in water. Common names can differ from region to region, and from state to state.<\/p>\n\n\n\n

If you want to know the scientific name of an animal, you must check the binomial, or two name, classification system developed in the early 1700s by Carolus Linnaeus.<\/p>\n\n\n\n

According to Linnaeus, our common sea star, also called Forbes\u2019 sea star, is classified this way:<\/p>\n\n\n\n

Kingdom: <\/strong>Animalia<\/p>\n\n\n\n

Phylum: <\/strong>Echinodermata<\/p>\n\n\n\n

Class: <\/strong>Asteroidea<\/p>\n\n\n\n

Order: <\/strong>Forcipulatida<\/p>\n\n\n\n

Family: <\/strong>Asteriidae<\/p>\n\n\n\n

Genus: <\/strong>Asterias <\/em><\/p>\n\n\n\n

Species: <\/strong>Asterias forbesi <\/em><\/p>\n\n\n\n

But remember: Scientific names also change from time to time, as in the case of a well-known smooth cordgrass found in North Carolina.<\/p>\n\n\n\n

Read the smooth cordgrass story<\/a>. <\/em><\/p>\n\n\n\n

Terri Kirby Hathaway is a marine education specialist at North Carolina Sea Grant. Three times a year she publishes Scotch Bonnet, a compilation of professional development workshops and resources for North Carolina educators. The latest issue is always available here<\/a>. <\/em><\/p>\n\n\n\n

Related<\/h2>
\nWinter 2019 Issue<\/span><\/svg><\/span><\/a>\n<\/div><\/div>\n"},"excerpt":{"rendered":"

Even though they live in water, they don\u2019t have scales, don\u2019t swim, and aren\u2019t \u201cfish.\u201d<\/p>\n","protected":false},"author":67,"featured_media":12004,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"views\/single-immersive.blade.php","format":"standard","meta":{"_acf_changed":false,"source":"","ncst_custom_author":"Terri Kirby Hathaway","ncst_show_custom_author":true,"ncst_dynamicHeaderBlockName":"ncst\/default-immersive-post-header","ncst_dynamicHeaderData":"{\"backgroundColor\":\"custombg_one\",\"caption\":\"A star by any name: Asterias forbesi. Paul Morris\/CC BY-SA 2.0.\",\"displayCategoryID\":647,\"showAuthor\":true,\"showDate\":true,\"showFeaturedVideo\":false,\"subtitle\":\"Even though they live in water, they don\u2019t have scales, don\u2019t swim, and aren\u2019t \u201cfish.\u201d\"}","ncst_content_audit_freq":"","ncst_content_audit_date":"","ncst_content_audit_display":false,"ncst_backToTopFlag":"","footnotes":""},"categories":[574,599,647],"tags":[],"_ncst_magazine_issue":[659],"class_list":["post-12002","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-574","category-animals","category-winter-2019"],"displayCategory":{"term_id":647,"name":"Winter 2019","slug":"winter-2019","term_group":0,"term_taxonomy_id":648,"taxonomy":"category","description":"","parent":574,"count":10,"filter":"raw"},"acf":{"ncst_posts_meta_modified_date":null},"yoast_head":"\nSea Science: You Say Starfish, I Say Sea Star - Coastwatch<\/title>\n<meta name=\"description\" content=\"Even though they live in water, they don't have scales, don't swim, and aren't "fish."\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ncseagrant.ncsu.edu\/coastwatch\/you-say-starfish-i-say-sea-star\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"You Say Starfish, I Say Sea Star\" \/>\n<meta property=\"og:description\" content=\"Even though they live in water, they don't have scales, don't swim, and aren't "fish."\" \/>\n<meta property=\"og:url\" content=\"https:\/\/ncseagrant.ncsu.edu\/coastwatch\/you-say-starfish-i-say-sea-star\/\" \/>\n<meta property=\"og:site_name\" content=\"Coastwatch\" \/>\n<meta property=\"article:published_time\" content=\"2019-12-16T21:44:38+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-08-20T17:43:05+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/ncseagrant.ncsu.edu\/coastwatch\/wp-content\/uploads\/sites\/13\/2019\/12\/image-1-Paul-Morris-CC-BY-SA-2.0-20120523062021Asterias_forbesi_ventral-copy-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1920\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Katelyn Vause\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"You Say Starfish, I Say Sea Star\" \/>\n<meta name=\"twitter:description\" content=\"Even though they live in water, they don't have scales, don't swim, and aren't "fish."\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/ncseagrant.ncsu.edu\/coastwatch\/wp-content\/uploads\/sites\/13\/2019\/12\/image-1-Paul-Morris-CC-BY-SA-2.0-20120523062021Asterias_forbesi_ventral-copy-scaled.jpg\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Katelyn Vause\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/ncseagrant.ncsu.edu\\\/coastwatch\\\/you-say-starfish-i-say-sea-star\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/ncseagrant.ncsu.edu\\\/coastwatch\\\/you-say-starfish-i-say-sea-star\\\/\"},\"author\":{\"name\":\"Katelyn Vause\",\"@id\":\"https:\\\/\\\/ncseagrant.ncsu.edu\\\/coastwatch\\\/#\\\/schema\\\/person\\\/55240136542ee5b536e242cebbb52406\"},\"headline\":\"Sea Science: You Say Starfish, I Say Sea Star\",\"datePublished\":\"2019-12-16T21:44:38+00:00\",\"dateModified\":\"2024-08-20T17:43:05+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/ncseagrant.ncsu.edu\\\/coastwatch\\\/you-say-starfish-i-say-sea-star\\\/\"},\"wordCount\":670,\"image\":{\"@id\":\"https:\\\/\\\/ncseagrant.ncsu.edu\\\/coastwatch\\\/you-say-starfish-i-say-sea-star\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/ncseagrant.ncsu.edu\\\/coastwatch\\\/wp-content\\\/uploads\\\/sites\\\/13\\\/2019\\\/12\\\/image-1-Paul-Morris-CC-BY-SA-2.0-20120523062021Asterias_forbesi_ventral-copy-scaled.jpg\",\"articleSection\":[\"2019\",\"Land and Sea Animals\",\"Winter 2019\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/ncseagrant.ncsu.edu\\\/coastwatch\\\/you-say-starfish-i-say-sea-star\\\/\",\"url\":\"https:\\\/\\\/ncseagrant.ncsu.edu\\\/coastwatch\\\/you-say-starfish-i-say-sea-star\\\/\",\"name\":\"Sea Science: You Say Starfish, I Say Sea Star - 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