Theodoxus snail: cov ntsiab lus, luam tawm, piav qhia, duab

Lub ntsiab nta ntawm hom

Lub genus belongs rau tsev neeg Neretid. Zoo li feem ntau cov txheeb ze, lawv tuaj yeem nyob hauv ob qho tib si hauv dej tshiab thiab cov dej khov. Lawv qhov loj me mus txog qhov nruab nrab ntawm ib centimeter hauv qhov siab. Lub plhaub yog puag ncig, nrog me ntsis curl; rau ntau, nws zoo li lub tais lossis khob hauv cov duab. Nyob rau sab nraum qab ntawm ib leeg muaj lub kaus mom, uas tus tsiaj kaw qhov nkag raws li xav tau, zoo li ampoules. Lub qhov muag yog lub teeb, lub hau thiab nkag yog yellowish.

Cov xim ntawm mollusks yog ntau haiv neeg thiab zoo nkauj. Cov qauv ntawm lub plhaub yog qhov sib txawv - qhov loj thiab me me los yog sib cuam tshuam zigzags ntawm lub teeb los yog tsaus dua. Lub plhaub lawv tus kheej yog tuab-walled thiab ntom, ruaj heev. Qhov tseeb yog tias nyob rau hauv qhov xwm txheej, mollusks nyob rau hauv reservoir nrog ib tug heev muaj zog tam sim no, thiab ib tug muaj zog plhaub tsuas yog tsim nyog rau lawv nyob rau hauv cov kev mob no.

Hom:

• Theodoxus danubialis (theodoxus danubialis) - zoo nkauj heev mollusks nrog plhaub ntawm txiv qaub-dawb xim nrog ib tug whimsical qauv ntawm tsaus zigzags ntawm txawv thicknesses. Lawv tuaj yeem loj hlob mus txog ib thiab ib nrab centimeters. Lawv nyiam dej tawv.
• Theodoxus fluviatilis (theodoxus fluviatilis) - hom tsiaj tau muab faib rau thaj tsam loj, tab sis tib lub sijhawm nws suav tias tsis tshua muaj. Tshaj tawm hauv Tebchaws Europe, Russia, Scandinavian lub tebchaws. Lub plhaub yog xim dub - xim av, xiav, ntshav, nrog cov dawb dawb speckles. Lawv muaj tus cwj pwm nthuav: ua ntej noj algae, lawv zom lawv rau ntawm pob zeb. Yog li ntawd, cov av yog nyiam rocky.
• Theodoxus transversalis (theodoxus transversalis) - me me qwj, plhaub tsis muaj qauv, xim ntawm greyish mus rau daj los yog xim av-daj.
• Theodoxus euxinus (theodoxus euxinus) - molluscs nrog lub plhaub ntawm lub teeb xim zoo nkauj, nrog cov qauv zoo nkauj ntawm cov kab tawg thiab specks. Lawv nyob hauv thaj chaw sov - Romania, Greece, Ukraine.
• Theodoxus pallasi (theodoxus pallasi) - nyob hauv dej khov thiab ntsev. Tej yam ntuj tso cheeb tsam - Azov, Aral, Dub hiav txwv, dej ntws nyob rau hauv lawv basins. Tsawg tshaj li ib centimeter loj, cov xim yog tsaus specks thiab zigzags ntawm greyish-daj keeb kwm yav dhau.
• Theodoxus astrachanicus (theodoxus astrachanicus) - nyob hauv Dniester, tus dej ntws ntawm Azov Sea phiab. Cov gastropods no muaj lub plhaub zoo nkauj heev thiab meej meej: nquag zigzags tsaus nti ntawm keeb kwm daj.

Leej twg yog theodoxus

Cov no yog cov ntses me me uas nyob hauv dej ntawm Russia, Ukraine, Belarus, Poland, Hungary. Lawv kuj pom nyob rau hauv lub Baltic thiab Scandinavian lub teb chaws.

Qhov tseeb, lawv tsuas tuaj yeem raug hu ua dej tsis qab, vim qee hom ntawm Theodoxus genus nyob hauv Azov, Dub thiab Baltic Seas. Raws li txoj cai, ntau pua txhiab xyoo dhau los, tag nrho cov gastropods no nyob hauv dej hiav txwv ntsev, thiab tom qab ntawd qee hom tsiaj maj mam tsiv mus rau cov dej tshiab thiab cov pas dej.

Tsis muaj dab tsi txawv ntawm thawj glance. Txawm li cas los xij, ib qho yuav tsum tsis txhob poob siab ua ntej, cov neeg sawv cev hauv tsev no ntawm cov chav kawm ntawm gastropods muaj ntau yam xim ntawm lub plhaub, cov cwj pwm nthuav, thiab cov yam ntxwv ntawm kev yug me nyuam. Thaum kawg, lawv tsuas yog zoo nkauj!

Cov qwj no tau piav qhia tau zoo rau lub sijhawm ntev, thiab tau muaj thiab tsis muaj kev tsis sib haum xeeb txog lawv qhov chaw hauv kev tshawb fawb: chav kawm Gastropoda (Gastropoda), tsev neeg Neritidae (Neretids), genus Theodoxus (Theodoxus).

Raws li txoj cai, cov neretids no nyob ntawm cov pob zeb tawv, uas cuam tshuam nrog lawv cov khoom noj. Lawv khawb tawm cov algae tsawg tshaj plaws thiab detritus (qhov seem ntawm cov organic teeb meem decomposed) los ntawm cov tawv tawv uas npog nrog dej.

Snails ua tau zoo tshaj plaws hauv dej tawv. Thiab qhov no tsis yog qhov xav tsis thoob, vim lawv xav tau calcium ntau los tsim lub plhaub.

Ntau tus neeg tau ntsib cov mollusks hauv lawv cov dej ntws thiab cov pas dej, tab sis ob peb tus neeg xav tias lawv tuaj yeem khaws cia hauv lawv lub thoob dej yug ntses me me rau qhov ua tau zoo. Qhov nruab nrab lifespan ntawm neretids yog hais txog 3 xyoo.

Cov ntsiab lus

Kev saib xyuas ntawm cov kwj zoo no tsis yog qhov nyuaj. Lawv zoo sib xws ntawm qhov kub ntawm +19 thiab ntawm +29. Lawv pub rau algae, thiab ua haujlwm nquag - cov no yog cov pab zoo heev, ua tsaug rau nws yooj yim dua rau tus tswv kom huv lub thoob dej yug ntses. Tseeb, tawv algae fouling, xws li "dub hwj txwv", yog tawv heev rau lawv. Snails tawm cov nroj tsuag siab dua - qhov no kuj yog lawv qhov loj ntxiv. Raws li txoj cai, lub thoob dej yug ntses nyob rau hauv uas cov gastropods nyob ib txwm zoo huv si, thiab cov nroj tsuag nyob rau hauv nws yog huv si thiab noj qab nyob zoo.

Ntau hom mollusks nyiam dej tawv, nplua nuj calcium - lawv xav tau nws rau lub plhaub muaj zog. Koj tuaj yeem tso lub hiav txwv (limestone) pob zeb rau hauv lawv hauv cov thoob dej yug ntses (saib rau hauv tus account, tau kawg, kev txaus siab ntawm lwm tus neeg nyob hauv thoob dej yug ntses). Lawv kuj tsis nyiam dej khov.

Snails tsis muaj tsawg dua 6-8 ib zaug. Lawv tseem me me, yog li hauv cov lej me me koj tsuas yuav tsis pom lawv hauv cov thoob dej yug ntses. Tsis tas li ntawd, qhov nyiaj no yog qhov tsim nyog rau kev yug me nyuam. Qhov tseeb yog tias cov mollusks no yog ob leeg heterosexual thiab bisexual, thiab tib lub sijhawm txiv neej tsis txawv ntawm cov poj niam txhua.

Ib qho nthuav feature ntawm tus cwj pwm ntawm cov neeg ntxim hlub nyob hauv lub thoob dej yug ntses yog tias lawv txhua tus muaj nws qhov chaw nyob hauv "tsev neeg". Qhov no yog qhov chaw uas tus tsiaj so thiab thaj tsam ntawm uXNUMXbuXNUMXbthe thaj chaw uas nws "txheej txheem". Raws li txoj cai, qhov no yog qhov nyuaj - lawv nyiam nws mus rau nplooj thiab stems ntawm cov nroj tsuag. Nws feem ntau tshwm sim tias me me theodoxus nyob ntawm lub plhaub ntawm cov mollusks loj. Snails ua tib zoo thiab ua tib zoo tshem lawv thaj chaw ntawm fouling, thiab tsuas yog qhov tsis txaus ntawm cov zaub mov tuaj yeem yuam kom lawv tawm ntawm thaj tsam ntawm qhov chaw no.