Bo-rasaense ba mehleng ena ba nka li-crustaceans, li-arthropods tsa khale ka ho fetisisa tsa chelicerales, e leng libōpuoa tse ikhethang le tse makatsang. Ho tloha ponong ea leloko, beng ka bona ba haufi ka ho fetisisa lefatšeng la liphoofolo kajeno ke makhoaba a lipere, moo tikoloho ea teng e leng libaka tse sa tebang tsa Atlantic, Indian le Pacific Oceans, le makhoaba a lefatše le likhohola.
Ka ponahalo, makhoaba a ne a tšoana le seretse se seholo. Bolelele ba 'mele ea bona hangata bo ne bo fihla ho limithara tse' maloa. Joalo ka scorpion, crustaceans ba ne ba e-na le libetsa tse matla - leqeba le chefo le pheletsong ea mohatla. Liphatla tsa liphoofotsoana tse kotsi li ne li hlometse ka likhoele tse leshome kapa tse telele tse neng li thusa liphoofolo hore li tšoare le ho tšoara phofu ea tsona. Maoto a ka morao a ne a fetotsoe hore e be mapheoana.
Li-crustaceans tse kholo - meea e meholo e lulang maoatleng le maoatleng a nako ea Devonia - e ne e lula sebakeng se ikhethang har'a li-invertebrates. Nako e ne e le se seng sa lihlopha tse ngata tsa liphoofolo tsa khale tse shoeleng ka mabaka a sa tsejoeng.
Hlooho ea palo ea batho ba crustaceans, ho latela bo-ramahlale, e oela ho Silurian le Devonia. Sebaka sa bona sa bolulo e ne e le matangoana a matle haholo a aparetseng lefatše ka nako eo. Ha re le tikolohong ea libatana, ho ile ha lula mefuta e fapaneng ea litlhapi hammoho le li-trilobites, e leng se ileng sa theha lijo tsa crustaceans.
[edit] Evolution
Racoscorpions e bile teng ho pholletsa le mehla ea Paleozoic - 510-248 Ma tse fetileng. Mefuta ea pele e ne e lula metsing a sa tebang a leoatleng. Hoo e ka bang limilione tse 325-299 tse fetileng, boholo ba crustaceans ba phela ka metsi a hloekileng.
Racoscorpion e ne e ka oela naheng.
Mabapi le taba ena, li-crustaceans lia khahlisa joalo ka mohlala oa phetoho ea ho tloha bophelong ba leoatleng ho ea bophelong lefatšeng.
[edit] Phology
Li-Racoscorpions li ne li le ka bolelele ho tloha 20 cm ho isa ho 2,5 esita le limithara tse 3. Li-arthropod tse kholo ka ho fetisisa ke tsa crustaceans - Jaekelopterus rhenaniae, e phetseng lilemo tse ka bang limilione tse 460-255 tse fetileng, mme e ne e le bolelele ba limithara tse 2,5.
Ba ne ba e-na le lipalo tse kang tsa oar tse neng li ba lumella ho sesa kapa ho khasa ka tlase.
Tlhomamiso
Taelo eo e kenyelletsa lelapa la Pterygotidae, ea phetseng lilemo tse ka bang limilione tse 470- 300 ke tse fetileng. E ne e le litho tsa superfamily Pterygotioidea. Sehlopha sena se kenyelelitse batho ba nkoang e le li-arthropods tse kholo ho feta nalane historing ea polanete. Bolelele ba 'mele ba libopuoa tse joalo bo ne bo fihla ho limithara tse peli le halofo. Ho kenyelletsa mefuta e mengata ea tsoalo: Acutiramus - ea neng a lula ho tloha Late Silurian ho ea ho Dyon ea pele. Phuputso e entsoeng ka 2011 e bonts'itse hore phoofolo ena e ne e ka ba scavenger kapa esita le phytophage.
Li-arthropod tse kholo ka ho fetisisa ke tsa li-crustaceans - Jaekelopterus rhenaniae, ea phetseng lilemo tse ka bang limilione tse 460-255 tse fetileng mme a le bolelele ba limithara tse 2,5.