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Fig. 9 | Frontiers in Zoology

Fig. 9

From: Does the frontal sensory organ in adults of the hoplonemertean Quasitetrastemma stimpsoni originate from the larval apical organ?

Fig. 9

5-HT-like immunoreactivity (5-HT-lir) in the vermicular stage larva and adult worm of Quasitetrastemma stimpsoni. In a-a4, b and b1: red - 5-HT-lir, green–cilia (acetylated tubulin immunoreactivity), blue—nuclei (DAPI). In b2: red–cilia (acetylated tubulin immunoreactivity), green–5-HT-lir, blue—nuclei (DAPI). The apical pole is always upward; side view. a General view of 5-HT-lir in the vermicular stage larva, 7 d post-fertilization (dpf) with paired brain lobes (br) connected by dorsal commissural tract (dc) and extending lateral nerve cords (lnc). a1-a2 Apical organ cells, 5-HT-lir positive (asterisks). a3-a4 High-magnification inset shows resorbed apical neurons (asterisks). b General view of 5-HT-lir cells (asterisks) in the frontal organ of the adult worm. Tiny processes (arrowhead) of 5-HT-lir cells running from the organ to the left and right sides of the nemertean body wall. b1-b2 High-magnification inset shows 5-HT-lir cells (asterisks) in the frontal organ. Abbreviations: an–apical neuron; br–brain rudiment; dc–dorsal commissural tract; ln–lateral neuron; lnc–lateral nerve cord

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Frontiers in Zoology

ISSN: 1742-9994