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Fig. 8 | BMC Evolutionary Biology

Fig. 8

From: On the role of the proventricle region in reproduction and regeneration in Typosyllis antoni (Annelida: Syllidae)

Fig. 8

Aberrant stolons of Typosyllis antoni. Light microscopic images (a, c-e) and confocal maximum projection of anti-f-actin staining (b, depth coded, legend below image), anterior is left in all images. a Dorsal and b ventral view of a sequential stolon showing two complete and one imperfect head. Borders between the distinct stolons are indicated by arrows, dotted lines in b indicate anterior margin and eyes. The asterisks highlight two segmental borders in the anteriormost stolon, which also showed signs of muscle degeneration. c Sequential stolon with a longer anterior one and a poorly developed second one. Arrows indicate borders between the two stolons. d Aberrant stolon with anterior end showing a fusion of heads, as visible in the increase in eye number (insert with close-up). Arrowheads indicate the antenna. e Sequential stolon composed of two stolons with the first one being only represented by one segment. Abbreviations: ssm, stolon sphincter muscle. Scale bars = 100 μm

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