Dhalmada u ekaa badda. ubaxa oo badda Class (sawir)

dunida aan la saadaalin karin ee nolosha badda, waa mid la yaab leh. Qaar ka mid ah iyaga ka mid ah, oo ay la socdaan shacaab iyo algae u sameeyaan a beero quuska gaar ah. Crinoids - a xayawaanka benthic, ma dhirta, sida waxa ay u muuqataa at jaleecada hore. Waxay ka tirsan tahay echinoderms ah.

Deggan ubaxyada badda

Fasalkooda waa meel xad ballaaran of qaybinta. In badaha adduunka ee ku dhow meelaha jirin meel ay aan la kulmay crinoids. Waxaa jira qiyaastii 700 oo nooc oo baal-stars. The Ruush biyaha badda deggan oo kaliya 5 of noocyada ay.

Crinoids deggan oo dhan badaha. Qoto dheer iyaga u muhiim ahayn. Kulligood waxay wada siman si fiican. Weli bulk of xayawaankani door bidaan si ay u degaan ee biyaha diiran badda la jiqda Qoryaale dhagax badeed, ku yaalaan on moolkeeda gacmeed (200 mitir).

Noocyada ubaxyada badda

class Crinoids ka wakiil yahay laba nooc oo baal-xiddigaha - dabasocdo iyo besstebelchatymi. dadka oo dhan, iyadoo aan loo eegin nooca, ku xiran yihiin oo dhan cayn kasta oo alaabta biyaha hoostooda ku jira. crinoids dabasocdo, jirid, xididana wax, mar walba baaqi ku ahaadaan halkan. Zone ay dheefshiidka xaddidaya dhererka asliga ah on taas oo ay dhaqdhaqaaqdo.

Besstebelchatye u ekaayeen ubax, u diiday, taageero, waxaan helay xorriyad garoomada. Waxay ka substrate ka go'day, waxay awoodaan in ay ka gudbaan masaafada u yar. Sabayn xoolaha sabab rays, ka shaqeeya sidii fin ah. Si kastaba ha ahaatee, mid kasta oo aaday xiddiga qalinka wax garad ee geedi socodka horumarka ma idlaan doono tallaabo jirid ku lifaaqan. Habkaani iyo taranka labada nooc oo ubaxyada badda iyaga oo isku keena.

description noolaha

In magaca class this xoolaha xididdada Greek. Crinoids (Crinoidea) tarjumayaa "sida ubaxyada." Dhab ahaan, in shakhsiyaadka ka tirsan class this, jidhkaaga oo fantastik ah, sida ubax xaqse. isku mid ah oo ubax u siyaadiyaa xiddigaha baal jirka midabaynta midabo. Qaadaan arkaan uun badda u qurux badan, oo aan rabo inaan sawir isaga ah. Crinoids - decoration u faraxsan Jannooyin quuska, taas oo ka shaqeeyey on abuurista naqshadeeye a cajiib ah - Dabiicadda qudheedu.

Crinoids leeyihiin jirka koob-qaabeeya leh saabka afka ee xarunta. Up ka koobka kiciyey rays jahaysteen (gacmaha) iyo garaac. Waxaan dabasocdo crinoids lifaaqan hoose ee jirida koobka koraa si dherer ah hal mitir. Petiolus side la appendages lateral (Cirri) ku lifaaqan oo dhulka ku. Besstebelchatye ubaxyada waa uun Cirri ayaa la dhaqaajin karo, darafyadiisa oo waxaa la siiyaa serrated ama "haadeed". Thanks iyaga besstebelchatye shaqsiyaadka ugu cuslaataan dhulka ku.

Baal-xiddigaha ahaayeen echinoderms oo keliya, kuwaas oo u suurtagashay in ay ilaashadaan orientation isirka sifo ee jirka. kooxda dhabbar ay dhabxanagga dhulka ku, iyo dusha sare in la siiyo saabka afka kor u soo jeestay. The salaysan qaab-dhismeedka jirkooda dhigay shan jidka dhabanada radial. Jirku wuxuu u sameeyey by shan rays awood u tarmin kala qaybiyaa qaybo iyo foomka at 10-200 "gacmaha been ah." alwaaxdii saqafka haysay waxaa la siiyaa laamaha kala duwan lateral (pinnulami).

Thanks to Corolla ka hirgashay sameeyay nooc ka mid ah network in dhaco plankton iyo dhabkiyo. Rays dhigo dhinaca gudaha waxaa la siiyaa a grooves muco-ciliary, kuwaas oo hoos u dhigay saabka afka. Marka cuntada iyaga guuro afkiisa. Buro qarkiisa ka dhanka ah ee ku tiil toobinta ku qalabeysan yahay furitaanka futada.

Xirrira lafaha calcareous dibadda ka qayb qaybaha. Waxay ka kooban tahay laba qaybood: rays endoskeleton iyo jirid. Kuwani xoolaha benthic ayaa tentacle, habdhiska taranka iyo (sababa dhalmo ee ubaxyada badda) nidaamka. The saabka-rays gelin ah stem iyo laanta dhammaan hababka loo qoondeeyey.

Crinoids ka dhigooda aan u janjeedha oo kaliya caan khadka dhexe dhabbar-caloosha in waddaa iyada oo meydadka dhammaan xayawaanka, laakiin sidoo kale gaadmada dibadda. qaybaha Tentacle nidaamka qalin-star fududeeyey. Tusaale ahaan, ma aysan soo geli dhalada, loo xakameeyo lugaha. Waxaa lagama helo xoolaha iyo madreporite.

dhalmo

Waxaan kuwa dhalmo ah ee ubaxyada badda ka qabtaan. echinoderms Kuwanu waa xayawaanka dioecious. waxyaabaha galmada ku dhacaa kuwa pinnuly in yaalaan u dhaw in ay koobka. manida Lab badanaa marka hore dhoofay ka pinnul isticmaalaya godad gaar ah.

Dhaqankiisa keenaysaa in kicinta ee dumar ah, oo aan lahayn wax laga shido taranka. Her pinnuly kaliya ayaa qarxaya, iyo soo dhacaan iyaga ka mid ah ukunta. bacrinta ukunta la sameeyaa xaq biyaha, ka dibna waxay u jeedsadaan galay foosto doliolyariyu dirxiga. Sidaa darteed waxaa jirta dhalmo u ekaa badda.

doliolyary horumarinta

2-3 maalmood ka dib doliolyariya oo dhulka fadhiya. Its tip goynta waxaa xoogaystay on substrate ah, wax kasta oo walxaha adag oo xataa shakhsiyaad nooc iyaga u gaar ah.

Iyadoo badiyay cilia, waxa uu noqonayaa mid go'an.

pentakrinusa Step qeexay in koobka si tartiib tartiib ah ku muujiyey qaab-dhismeedka shan geesood. Jirid u koraa, u kordhiyo, horumarinta alwaaxdii ku lifaaqan disk kordhay. Doliolyariya uu bilaabo inuu u eg a baal-star yar, bobbing on asliga ah. Its size kala duwan ee bareeg ah ee 0.4-1 cm. Biyihii cidhifka woqooyi Cold u abaari dirxiga si ay u koraan ilaa 5 cm oo dherer ah. Muddo doliolyariya kordhiyay, kala galay jirid iyo koob, taas oo markii danbe la aasaasay afka. Marka marxaladdan of horumarinta ee dirxiga tsistoideynaya dhamaado.

Khilaaf ku saabsan horumarinta kooxaha

Haddii taranka ee ubaxyada badda iyo horumarinta dirxiga of isku, ka dib markii dhamaystirka pentakrinusa stage in labada koox ee crinoids sii koriinkedu socodka duwan. shakhsiyaadka dabasocdo, Xidhan in ay hal meel, helaan qaybaha cusub ee asliga ah. Ay ku hagaagay asliga ah uu noqonayaa sida xidhmooyin ee lacagta birta ah (for araxda shaqsi Hashii on kasta oo kale).

Araxda ku leedahay xiriir la dhaqaajin karo kaas oo bixiya muruqa. xarunta stem permeated channel, halkaas oo dareemayaasha jiifsan iyo qarin xubnaha kale. Cirri diyaarin laba siyaabood: ama agagaarka laan gabowday oo kale, ama salkeeda.

Qofka keensataa la mid cajiib ah la ubaxa in, dhab ahaantii, muujiyaan sawirro badan oo heer sare ah. casri ah Crinoids afkoda leeyihiin dhererka kala duwan, waxaa sida caadiga ah ku koobnayn 75-90 cm. Oo fossils afkoda dhererka gaadhay 21 m. Xiddiga baal Qarniyadii hore ahaayeen kooxda dhabta ah.

Besstebelchatye ubaxa oo uu yeesho si ka duwan. Ka dib markii muddo bil ah iyo badh koob madax-bannaan ka stem jabay, ha sabeyn si xor ah. jirida danbeyn dhinto.