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  <ns1:general>
    <ns1:identifier>o:353293</ns1:identifier>
    <ns1:title language="la">Phylum Echinodermata. Holothuria. Synapta.</ns1:title>
    <ns1:language>la</ns1:language>
    <ns1:description language="en">Class Holothuroidea

Living in marine habitats.
Holothuria (sea cucumber), with dorsal tube feet modified in papillae. 
At the anterior end a crown of oral podia which are transformed in tentacles,. Internal anatomy:  water-vascular system with ring canal, Polian vesicles, madreporite and stone canal (grey-blue); gonad (pink), digestive system (green) with stomach, intestine, cloaca and anus; respiratory trees and Cuvier tubules in connection with intestine; cloacal muscles (blue).
In the centre, ossicles with different shape, which are buried in leathery dermis.
Synapta. Animals with an elongated and vermiform body, which lack ambulacral podia, except around the mouth. They live in deep waters up to the greatest depths.
</ns1:description>
    <ns1:description language="it">Tavola parietale.
Tavola contenente n° 6 immagini.

Classe Holothuroidea
Marini.
Holothuria (cetriolo di mare), con pedicelli dorsali trasformati in papille. All’estremità anteriore corona di pedicelli orali, trasformati in tentacoli. Anatomia interna: sistema acquifero con canale anulare, vescicole del Poli e canale petroso (in azzurro grigio); gonade (in rosa); sistema digerente (in verde) con stomaco, intestino, cloaca e ano; albero respiratorio e tubuli di Cuvier che s’immettono nell’intestino; muscoli cloacali (in azzurro).
Al centro: ossicoli di forma differente, che stanno immersi nel derma coriaceo dell’oloturia. 
Synapta. Animali dal corpo allungato e vermiforme, che mancano di pedicelli ambulacrali, eccetto che intorno alla bocca. Vivono in acque profonde fino alle maggiori profondità abissali.
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