types of anchoring rootlets on stolons of Bowerbankia imbricata
(Adams, 1798) (Bryozoa: Ctenostomata) are discussed. Lateral anchoring
rootlets form near the growing tip of the stolon carrying zooids, but
become lateral structures as the stolon grows. These anchoring rootlets
may be resorbed or additional ones may be formed. Terminal anchoring
rootlets form on short stolons, which are devoid of zooids and do not
grow further. Once the tenninal anchoring rootlets have been produced,
they are not resorbed nor are new rootlets formed. In one case, anchoring
rootlets formed as outgrowths of an autozooidal bud, confirming that
zooidal types other than kenozooids are capable to produce anchoring
structures. The relation of these two types of anchoring rootlets to
other outgrowths is discussed.
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