Wadatacce
- Menene molluscs? Nau'i da Misalai
- Haɓaka molluscs
- Misalan haifuwar molluscs
- Haɓaka molluscs: katantanwa na kowa (Helix asperse)
- Haɓaka molluscs: kawa
DA mollusc haifuwa yana da bambanci kamar nau'ikan molluscs daban -daban da ke wanzu. Dabarun hayayyafa suna canzawa gwargwadon nau'in muhallin da suke rayuwa, ko na ƙasa ne ko na ruwa, duk da cewa dukkansu suna haifar da jima'i.
A cikin wannan labarin PeritoAnimal, zamuyi bayani dalla -dalla yaya haifuwar molluscs, amma da farko bari mu bayyana menene ainihin molluscs, wasu halayensu da muhimman bayanai game da tsarin haihuwarsu. Hakanan, zamu yi misalai dalla -dalla misalai biyu na haifuwa a cikin molluscs bisa ga nau'in.
Menene molluscs? Nau'i da Misalai
Molluscs suna samar da babban phylum na dabbobi masu rarrafe, kusan suna da yawa kamar arthropods. Akwai nau'ikan molluscs iri -iri, amma duk suna raba wasu halaye waɗanda ke haɗa su, kodayake kowannensu yana da nasa daidaitawa. Waɗannan sifofi da muka ambata suna cikin sassan jikinku, an rarrabe su ƙarƙashin yankuna hudu:
- Daya yankin cephalic, inda gabobi masu azanci da kwakwalwa ke tattarawa.
- Daya kafar locomotive ma muscular don rarrafe. An gyara wannan ƙafar a wasu ƙungiyoyi, irin su cephalopods, waɗanda ƙafarsu ta rikide zuwa tantuna.
- Yankin baya inda muke samun rami mai duhu, inda gabobin ƙanshin turare, gills (a cikin molluscs na rayuwar ruwa) da kuma wuraren da ke cikin jiki kamar dubura.
- A ƙarshe, alkyabbar. Shi ne dorsal surface na jiki, wanda ke ɓoye tsare -tsaren kariya kamar spikes, shells da venom.
Ciki na nau'in kifin kifi, akwai wasu azuzuwan da ba a san su sosai ba, kamar azuzuwan Caudofoveata ko ajin Solenogastrea. Waɗannan molluscs suna halin kasancewa siffar tsutsa da jikin da ke karewa ta hanyar tsinke.
Wasu molluscs suna da ilimin halittar jiki na asali, kamar yadda lamarin molluscs ke cikin azuzuwan Monoplacophora da Polyplacophora. Waɗannan dabbobin suna da ƙafar tsoka, kamar katantanwa, kuma jikinsu yana samun kariya ta harsashi ɗaya, a cikin yanayin monoplacophoras, ko kuma da yawa, a yanayin Polyplacophoras. Dabbobin da ke rukunin farko suna kama da tsutsa tare da bawul guda ɗaya, kuma na biyun suna kama da sanannen arthropod, armadillo.
Sauran nau'ikan molluscs sune bawon ganima, wanda, kamar yadda sunan ya nuna, suna da duka jiki ya kare ta harsashi cikin siffar hauren giwa. Waɗannan dabbobin suna cikin rukunin Scaphopoda, kuma na ruwa ne na musamman.
Mafi sanannun nau'ikan molluscs sune: bivalves kamar clams, kawa da mussels; gastropods kamar katantanwa da slugs; kuma, a ƙarshe, cephalopods, waɗanda su ne dorinar ruwa, sepia, squid da nautilus.
Idan kuna son zurfafa cikin duniyar kifin kifi, kada ku rasa labarinmu akan nau'ikan kifin kifi.
Haɓaka molluscs
A cikin irin wannan rukunin dabbobi daban -daban waɗanda, ƙari ma, suna iya rayuwa a cikin mahalli daban -daban, da mollusc haifuwa Hakanan ya bambanta kuma ya bambanta daban dangane da nau'in mollusk.
Molluscs suna haifuwa ta hanyar haifuwar jima'i, wato a cikin kowane nau'in akwai mutane marasa daidaituwa, molluscs mace ko namiji. Duk da haka, wasu nau'in suna hermaphrodites kuma kodayake yawancin ba za su iya yin takin ba (saboda suna buƙatar kasancewar wani mutum), wasu nau'in suna yin, kamar yadda yake ga wasu katantanwa na ƙasa.
Mafi yawan nau'in mollusc suna cikin ruwa kuma, a cikin wannan yanayin, babban nau'in hadi shine waje. Sai kawai wasu nau'in suna da hadi na ciki, kamar yadda yake tare da cephalopods. Saboda haka, molluscs na ruwa suna da hadi na waje. Duk mata da maza suna sakin gametes ɗin su a cikin muhalli, suna takin, haɓaka, ƙyanƙyashe kuma suna rayuwa a matsayin tsutsa masu 'yanci har sai sun kai matakin manya, wanda a cikin wasu nau'in kusan sessile ko rarrafe, kuma a wasu, masu iyo.
Molluscs na ƙasa, waɗanda sune gastropods huhu ko katantan ƙasa, suna da karin tsarin haihuwa. Kowane mutum yana da jinsi biyu, amma yana iya yin aiki ɗaya kawai a lokacin saduwa. Namiji yana gabatar da maniyyi ta hanyar azzakari cikin mace, inda za a haƙa ƙwai. Sannan mace za ta sa ƙwai masu takin da aka binne a ƙasa, inda za su bunƙasa.
Misalan haifuwar molluscs
Yawan ɗimbin nau'in molluscs daban -daban yana rikitar da kira na bayani game da r.samar da kifi, saboda haka, zamuyi bayanin misalai guda biyu mafi wakilci na haɓakar mollusc:
Haɓaka molluscs: katantanwa na kowa (Helix asperse)
Lokacin da katantanwa biyu suka balaga, suna shirye su yi haifuwar katantanwa. A baya, kafin saduwa, su biyu katantanwa suna shari'ar juna. Wannan jerin gwanon ya ƙunshi jerin ƙungiyoyin madauwari, frictions da sakin hormonal, wanda zai iya wuce sa'o'i 12.
Lokacin da katantanwa ke kusa, abin da muka sani a matsayin "dart na soyayyaWaɗannan sifofi sune darts na haɓakar hormone wanda ke ƙetare fatar katantanwa kuma yana haɓaka nasarar haihuwa. Bayan dart, ɗayan katantanwa yana ɗaukar azzakari daga ramin al'aura kuma ya sadu da ramin abokin tarayya, ya isa ya iya ajiye maniyyi.
Bayan fewan kwanaki, dabbar da aka haƙa za ta shigar da yankin cif ɗin ta cikin ƙasa mai ɗumi kuma ta saka ƙwai a cikin ƙaramin gida. Bayan wani lokaci, a katantanwa dari ƙarami zai fito daga wannan gida.
Haɓaka molluscs: kawa
Gabaɗaya, lokacin lokacin zafi ya zo da ruwan teku sama da 24 ºC, lokacin kiwo na kawa ya iso. Waɗannan dabbobin suna sakin wasu pheromones a cikin ruwa waɗanda ke nuna matsayin haihuwarsu. Lokacin da wannan ya faru, mata da kawa maza saki miliyoyin gametes da za a yi taki a waje da jikinsu.
Haɓaka ƙwai yana da sauri sosai kuma a cikin 'yan awanni kaɗan sun shiga matakin tsutsa. Bayan weeksan makonni kaɗan, suna faɗuwa zuwa ƙasa mai duwatsu, galibi ana sarrafa su ta siginar sunadarai daga wasu manyan kawa. wadannan larvae shiga cikin substrate ta amfani da siminti da suka kirkira kuma za su shafe sauran rayuwarsu a can.
Idan kuna son karanta ƙarin labarai makamantansu Haɓaka molluscs: bayani da misalai,, muna ba da shawarar cewa ku shiga ɓangaren Curiosities na duniyar dabbobi.