Mollusks

Wadatacce

• Nau'o'in mollusks
• Ilimin halittu
• Ciyarwa
• Mazauni
• Misalan mollusks

Mollusks dabbobi ne masu rarrafe waɗanda ke rarrabewa ta hanyar samun jiki mai taushi tare da ƙafar tsoka da aka rufe ta exoskeleton ko harsashi. Galibi dabbobin ruwa ne.

Nau'o'in mollusks

Akwai nau'o'i daban -daban guda uku ko nau'ikan mollusks:

• Gastropods. Katantanwa da slugs. Kusan kashi 80% na mollusks suna cikin wannan ajin.
• Cephalopods. Octopus, squid da cuttlefish. Ƙungiya ce da ba ta da yawa amma ta sami ci gaba sosai.
• Vivalves. A cikin wannan rukunin akwai tsutsotsi, mussels da kawa. Halin wannan ƙaramin ƙungiya shi ne su kaɗai ne daga cikin ƙananan rukunoni uku waɗanda ba su da radula. Tsuntsaye, mussels da kawa. Su kadai ne ba su da radula.

Ilimin halittu

• Tsarin numfashi. Yawancin mollusks suna numfasawa ta hanyar gills, kodayake wasu nau'in sun haɓaka tsarin numfashi na huhu.
• Tsarin narkewa. Mollusks suna ciyarwa ta wani gabobin da ake kira radula wanda yake siffa kamar harshe. Har ila yau ana kiranta alkyabbar, wannan sashin yana rufe taro na visceral kuma a cikin wasu nau'in yana ɓoye carbonate na carbonate don ƙirƙirar harsashi.
• Tsarin jijiyoyin jini. Suna da zuciya, aorta, da jijiyoyin jini.
• Tsarin haihuwa. Mollusks suna da oviparous, wato, suna hayayyafa ta hanyar sanya ƙwai ta mace. Halayensu na kadaici ne, ba ya yawaita ganin su a ƙungiya, sai lokacin da suke saduwa. Yawancin mollusks sune hermaphrodites.

Ciyarwa

Nau'in ciyar da mollusks ya bambanta gwargwadon kowane nau'in. Gabaɗaya, mollusks na ƙasa ciyawa ce, yayin da mollusks na ruwa masu cin nama ne, duk da cewa su ma sun dogara da abincin su akan plankton da algae.

Mazauni

Dangane da mazauninsu, mollusks na iya rayuwa a ƙarƙashin ruwa, a ƙarƙashin teku (sun ƙunshi kashi 23% na duk dabbobin ruwa da na ruwa), amma kuma za su iya yin amfani da su da rayuwa mita 3,000 sama da matakin teku a ƙasa.

Misalan mollusks