Download PDF by Ted O'Hare: Amphibians

By Ted O'Hare

ISBN-10: 1595154159

ISBN-13: 9781595154156

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Leptogorgia ("látigo de mar"). Corallium (coral rojo utilizado en joyería) (ver fig. 203). Orden Pennarulacea ("plumas de mar") (véase fig. 204). En su mayoría son colonias con un eje sólido, no ramificado, de aspecto córneo. A menudo presenta espículas calcáreas (esqueleto calcificado). Esqueleto de origen ectodérmico. Son colonias con cuerpo carnoso alargado o aplanado. Ejemplos: Stylatula; Veretillum; Renilla ("violeta de mar"; o "pensamiento de mar" (ver fig. 205). 2) SUBCLASE ZOANTHARIA o HEXACORALARIOS.

2) SUBCLASE ZOANTHARIA o HEXACORALARIOS. Se trata de antozoos con pólipos que presentan número distinto de ocho tentáculos (generalmente mayor y en muchos casos es múltiplo de seis), rara vez pinados, generalmente no ramificados. Se presentan como individuos solitarios o en colonias. Orden Zoanihidea. Se trata de antozoos parecidos a pequeñas anémonas, pero que tienen un solo sifonoglifo y sin esqueleto. Solitario o colonial. Ejemplo: Polythoa. Orden Aciiniaria (o "anémonas de mar", ver figs. 200 y 201).

38 — Se estima que en un plazo de 45 días, todas las células que integran la hidra son sustituidas por nuevas células originadas a partir de las células intersticiales o germinales, que están situadas a modo de cuña, entre las epitelio-musculares. 3) Cnidoblastos. También exclusivamente ectodérmicos en hidra, se forman a partir de células intersticiales de la propia epidermis y, después de migrar a la cavidad central retornan a su localización habitual. Cuando son descargados los nematocistos, el resto del cnidoblasto es digerido en el enteren y se producen nuevos cnidoblastos, siempre a partir de las células intersticiales.

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Amphibians by Ted O'Hare

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