| 31. | Feeding zooids are borne either evenly around the branch circumference or are absent from one face.
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| 32. | A pair of luminescent organs is on either side of the inlet siphon of each zooid.
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| 33. | A colony consists of a number of zooids which bud off from a long slender stolon.
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| 34. | Each individual zooid is a hermaphrodite.
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| 35. | The outer surface of the zooid is known as a tunic and is gelatinous and translucent.
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| 36. | Solitary zooids usually measure in length.
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| 37. | All post-Palaeozoic cyclostomes have interzooidal connections via pores in the vertical walls separating adjacent zooids.
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| 38. | The structure of the individual zooids is generally simple, with an uncalcified, flexible frontal wall.
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| 39. | Growth occurs by new rings of zooids being budded off around the edge of the elongating colony.
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| 40. | Each colony is entirely formed by the asexual reproduction of this founding zooid and subsequent clonal budding.
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