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TRANSCRIPT
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TRILOBITI
Capo anteriore non articolato Torace mediano segmentato Due solchi longitudinali Occhi composti 4 segmenticefalici fusi Torace con numerosi segmenti 3 stadi larvali con muta
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CHELICERATI
Niente antenne Corpo diviso in CEFALOTORACE (prosoma) E ADDOME (opistosoma) Prime paia di appendici devolute all’alimentazione CHELICERI
Secondo paio di appendici con funzioni diverse PEDIPALPI
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MEROSTOMI (Xifosuro)
Chelicerati acquatici con 5 o 6 paia di appaendici addominali modificate in branchie e un telson a forma di dardo all’estremità del corpo
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ARACNIDI Epicuticola cerosa. Polmoni a libro, trachee, seta, veleno Prosoma non segmentato coperto da scudo dorsale e piastre venrali Con 4 paia di zampe. Addome segmentato nelle forme primitive Organi escretori ghiandole coxali, gonocorici sviluppo diretto Spermatofore. Digestione parzialmente esterna
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Negli ACARI Grande successo del parassitismo Miniaturizzazione Prosoma e opistosoma uniti con unico scudo sclerotizzato (carapace). Regione cefalica con parti boccali detta gnatostoma Con cheliceri e pedipali di forma variabile per funzione
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I PICNOGONIDI o ragni di mare Hanno il corpo inesistente e segmentato, e zampe aggiuntive (4-6) Zampe ovigere nel maschio Capo con proboscide , si nutrono di coralli spugne e briozoi, ma Anche alghe
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CROSTACEI Molte specie, grande importanza Ecologica, gruppo etereogeneo Acquatici In tuttti i crostacei DUE PAIA DI ANTENNE UN PAIO DI MANDIBOLE���DUE PAIA DI MASCELLE OCCHI COMPOSTI Mentre i segmenti del tronco sono Variabili con specializzazione Delle varie regioni CAPO TORACE (cefalotorace- carapace) ADDOME Appendici simili fra loro in forme Primitive poi diversificazione (molte funzioni) gonocorici
NAUPLIO
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APPENDICI
massillipedi
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CROSTACEI schema filogenetico classificazione
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ENTOMOSTRACI
Cefalocaridi
Branchiopodi (anostraci, notostraci, cladoceri)
Maxillopoda 8branchiuri, pentastomidi, Ostracodi, copepodi cirripedi
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Anostraci Notostraci
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COPEPODI e CIRRIPEDI
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MALACOSTRACI Phyllocaridi (leptostraci)
Oplocaridi (stomatopodi)
Eumalacostraci (sincaridi, peracaridi, Eucaridi)
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SCHEMA MALACOSTRACO
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STOMATOPODI
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PERACADIRI ed EUCARIDI
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PERACARIDI Anfipodi e isopodi
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EUCARIDI REPTANTI Macruri Brachiuri anomuri
NATANTI
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