Ososayensi banamuhla babheka ama-crustaceans, ama-arthropods ama-chelicerales amadala kakhulu, izidalwa ezihlukile nezimangazayo. Ngokombono wokubuka kohlu lozalo, izihlobo zabo eziseduzane ezweni lezilwane zesimanje kukhona imfishi yamahhashi, indawo yazo okuyindawo engaxinzekanga yama-Atlantic, amaNdiya kanye nePacific Oceans, kanye nezindawo zomhlaba ezikude ne-scorpion kanye nezicabucabu.

Ngokubukeka, izifebe zazifana nofezela olukhulu. Ubude bomzimba wabo buvame ukufinyelela amamitha ambalwa. Njengofezela, ama-crustaceans ayephethe izikhali ezinkulu - udosi olunesihlungu olusekupheleni komsila. Izandulelo zezilwane ezidla izinyawo eziyingozi zazihlome ngezindlawu eziyishumi noma ngezindebe ezinde ezazisiza izilwane ekubambeni nasekubambeni inyamazane ebanjiweyo. Izandla zomkhonto zashintshwa zaba amafliphu.

Ama-Gius crustaceans - izipoki ezinkulu ezihlala olwandle nasolwandle lwesikhathi se-Devonia - zazihlala indawo ekhethekile phakathi kwama-invertebrates. Kwake kwaba elinye lamaqembu amaningi ezilwane zasendulo ezafa ngenxa yezizathu ezingaziwa.

I-heyday yesibalo sama crustaceans, ngokusho kososayensi, iwela phezu kweSilurian neDevonia. Indawo ababehlala kuyo yayinamachweba amade, acekeceke kakhulu ayekhona emhlabeni wamhlaba ngaleso sikhathi. Endaweni enamadlozi, izinhlobo ezahlukene zezinhlanzi zazihlala, kanye nama-trilobites, okwakhela isisekelo sokudla kwama-crustaceans.

[hlela] Ukuziphendukela kwemvelo

I-Racoscorpions ibikhona kuyo yonke inkathi ye-Paleozoic - eminyakeni engama-510- 248 ezigidi edlule. Izinhlobo zokuqala zazihlala emanzini angajulile olwandle. Cishe ngonyaka wama-325-299 wezigidi ezedlule, iningi lama-crustaceans laphila emanzini amasha.

Ama-Racoscorpion angashona aye emhlabathini.

Kulokhu, ama-crustaceans ayathakazelisa njengesibonelo soguquko olusuka empilweni yolwandle luya empilweni yasemhlabeni.

[hlela] I-Physiology

Ama-Racoscorpions avela ngosayizi ukusuka ku-20 cm kuye ku-2,5 ngisho naku-3 m. Ama-arthropods amakhulu kakhulu awaziwayo ama-crustaceans - Jaekelopterus rhenaniae, ebiphila cishe iminyaka engama-460-255 million edlule, futhi inobude obungamamitha ayi-2,5.

Babenenqwaba yemilenze efana ne-oar eyayibavumela ukuba babhukude noma bakhasa phansi ngaphansi.

Ukuhlukaniswa

I-oda lifaka umndeni uPterygotidae, owayephila cishe ngezigidi ezingama-470-370 edlule. Kwakungamalungu e-superfamily Pterygotioidea. Leli qembu lifake abantu abathile abathathwa njenge-arthropods enkulu kunazo zonke emlandweni weplanethi. Ubude bomzimba bezidalwa ezinjalo bufika ngamamitha amabili nengxenye. Kubandakanya inani lokuzalwa: I-Acutiramus - owayehlala kusuka eLate Silurian kuya kwi-Dyon yasekuqaleni. Ucwaningo olwenziwe ngo-2011 lwabonisa ukuthi lesi silwane kungenzeka ukuthi sasiyi-scavenger noma i-phytophage.

Ama-arthropod amakhulu amakhulu aziwe ama-crustaceans - Jaekelopterus rhenaniae, owayehlala cishe iminyaka engama-460-255 million edlule futhi enobude bamamitha ayi-2,5.