phyla: sipuncula 320 spp. echiura 135 spp. 10. protostomados menores
TRANSCRIPT
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PHYLA: SIPUNCULA 320 spp. ECHIURA 135 spp.
10. PROTOSTOMADOS
“MENORES”
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PHYLUMSIPUNCULA
“ pequeño sifón”
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- Forma, tamaño, color, hábitat y forma de vida- Regiones del cuerpo, pared del cuerpo y celoma - Protrusión y retracción del introvertio- Sistema digestivo y alimentación- Sistema excretor y excreción - Sistema nervioso- Reproducción y desarrollo- Relaciones filogenéticas
GENERALIDADES GENERALIDADES
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A-B. Natación y excavación en Sipunculus nudus.C-D. Lithacrosiphon, excavador de rocas.
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A. Aspidosiphon
B. Phascolion
C. Sistema nervioso central de Golfingia
D. Disección de Sipunculus nudus.
E. Sección transversal a tra- vés de la pared del cuerpo de S. nudus
F. Una urna libre de Phascolosoma
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Sipunculus nudus, Puerto Pizarro, fondo areno fangoso, Long. 10,0 cm
SIPUNCULIDAE
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Phasolosoma sp., con el introvertioparcialmente extendido.
Sipunculus nudus Antillesoma antillarum
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Phascolion gerardiAtlántico,
5 mm
Phasolosoma sp., con el introvertioparcialmente extendido.
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SISTEMA NERVIOSO Y ORGANOS DE LOS SENTIDOS
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PHYLUM ECHIURA
A. Morfología externa de
Echiurus sp.B y C: Macho y hemba de Bonelia viridis
C. Tatjanellia grandis, en po- sición de alimentación
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Urechis caupo en su galería
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B
C
D
B-D. Sacos anales con embudos ciliados de UrechisSEMs 60 x, 138x y 840x
EXCRECIÓN
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Sipuncula del PerúSipuncula del Perú
Sipunculus nudusSipunculus nudus (Tumbes) (Tumbes)Themiste hennahiThemiste hennahi (Lima) (Lima)PhascolosomaPhascolosoma sp. (Lima) sp. (Lima)
Echiura del PerúEchiura del Perú
¿¿Thalassema sp.( Lima)sp.( Lima)¿¿Urechis caupo (Pisco)
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Bonellia sp., Oeste de AustraliaLa probóscide está completamenteextendida.
Bonellia sp., la probóscide noestá completamente extendida.
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Bonellia viridis
Noreste del Atlántico, Mediterraneo, Mar Rojo, Indopacífico
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1. Bonelia viridis, hembra, Long. 15,0 cm
2. B. viridis, macho, Long. 1-3 mm
1 2
3
3. Urechis caupo, Long. 50 cm
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PROBÓSCIDES DE ECHIURA FOTOGRAFIADAS A PROFUNDIDADES DE 2635 m y 7570 m, RESPECTIVAMENTE.
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Desarrollo de Urechis caupo
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Relaciones filogenéticas
. Pared del cuerpo.
. Sistema nervioso.
. Reproducción
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Significance to humans
Fishermen in various parts of the world use sipunculan worms, mostly the larger sand-dwelling species, as bait. In Java, in the western Carolines, and in some parts of China, sipunculans are eaten by the locals.
Some species of echiurans are commonly used as laboratory animals for physiological, embryological, and biochemical studies. The substance bonellin has been studied because of its antibiotic properties.