Bivalves

Bivalves (elasmobranch aji) - shi ne yawanci jinkirin-dabba ba a kanta, ko na kullum dabbobi. Suna zaune a kasa na kududdufai. Known jinsunan mollusks suna wakilci a yau a cikin adadin fiye da goma sha biyar da dubu. Mafi yawansu ba su zauna a cikin teku, kasa - sabo ruwa.

Bivalves da dvustoronnesimmetrichnoe jiki. Ya kunshi da kafafu da kuma jiki, da shugaban an rage (rage). Matsayin mai mulkin, da kafar sandan-dimbin yawa. A motsi Shellfish shi ne iya jingina fitar da harsashi, Burrow a cikin ƙasa a kasa na kandami, ja dukan dabba a baya. A samfurori a haɗe zuwa kasa ko kwance a kan shi, da kafar yawanci rage zuwa wani karami ko mafi girma har.

Cover bivalves ne mai arziki a cikin daban-daban gland. Su da sirrin gamsai da sauran abubuwa. Saboda haka, misali, zuwa rufe kamnetochtsev kafafu ne gland cewa asirce acid iya lalata lemun tsami. Wannan damar da dabba don yardar kaina shiga cikin farar ƙasa cliffs. Mussels kuma zebra mussel da gland cewa asirce byssus. Wannan abu da aka ƙarfafa a cikin ruwa a cikin nau'i na lafiya strands ta wajen abin da bivalves sandararru a kan substrate.

Alkyabbar rami a daure ta biyu folds cewa rataya a kan sãsanninku. Ciki, akwai gills. Alkyabbar rami ma yana buɗewa dubura, al'aura fili da kuma koda ducts. Ruwa ratsa ta cikin gill siphon an cire ta hanyar da siphon cloacal wanda aka kafa da raya gefen alkyabba.

Kwatami dabbobi ne kafa ta biyu bude yatsun da aka haɗa ta na roba band a saman ko kulle - hakora wanda aka zubar tare da babba gefuna da bude yatsun. Mafiya yawa daga cikin wakilan da leaf azuzuwan ne guda size. Duk da haka, a wasu jinsunan, kwance a kan kasa, da kuma su ne daban-daban a cikin size da kuma siffar.

Ƙwaƙƙwafi na bude yatsun da aka za'ayi da mataki na haɗa da jijiya, wanda aka bai wa na roba Properties. Rapprochement tsokani rage zapirateley. Wadannan m tsokoki connect biyu bude yatsun. Nutse A karuwa ne saboda secretions na gland located in tamkar alkyabba. Winter bivalves kusan ba su girma. A sakamakon haka, da fuka-fuki an kafa shekara-shekara band. Adadin su iya sanin ko za a shekaru na dabba.

A juyayi tsarin da aka kafa na uku da nau'i-nau'i daga ganglia. Daya an located in da raya sashi na jiki, na biyu - a cikin kafa, da kuma na uku - a kan pharynx. Commissure - jijiya strands - gama duk nodes.

Sistem sakulasan tsarin kunshi Shellfish tasoshin da kuma zuciya. A cikin zuciya akwai daya kawai ventricle, atrial yan. Adadin su dace da adadin gills saboda gaskiyar cewa kowanne daga cikinsu yana wakilta fadada daga jini, wanda tashi daga numfashi tsarin. The zuciya ne located a kan dorsal sashi na jiki.

A bivalves quite talauci ɓullo da ma'ana gabobin. Azanci shine Kwayoyin suna warwatse a sassa daban-daban na jiki. Gills da gawarwakin sinadaran hankula - Osphradium. A kafar sanya statocysts. Wannan ma'auni gabobin. Wasu wakilan mollusks bambanta da gaban da yawa ramukan a gefuna da alkyabba.

A bakin aka located sama da kafar tushe a gaban jiki. A garesu akwai biyu ruwan wukake. Su inuwõyi ciliated epithelium - ya gashin idanu siffanta abinci barbashi don bakinsa. Esophagus takaice. Yana an haɗa zuwa kananan ciki, wanda ya buɗe hanta ducts. Tafi daga ciki miki. Yana Forms dama madaukai, hawa zuwa dorsal gefe, ya wuce ta ventricle da pericardium da suka wuce da kuma ƙare a cikin cloacal siphon.

Shellfish suna yadu amfani da mutum tattalin arziki aiki. Mutane da yawa, kamar scallops, oysters, mussels ana ci abinci.