Skip to main content
Fig. 10 | Frontiers in Zoology

Fig. 10

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

Fig. 10

5-HT-like immunoreactivity (5-HT-lir) in the pilidium gyrans larvae and adult of Kulikovia alborostrata (Heteronemertea). Red - 5-HT-lir, green–cilia (acetylated tubulin immunoreactivity), blue—nuclei (DAPI). The apical pole is always upward; side view. a-a2 Apical organ with two 5-HT-lir neurons (arrows) and apical tuft (at) in the pilidium gyrans larva. Tiny processes of 5-HT-lir cells surround an apical plate (ap). b General view of three frontal organs (asterisks) in K. alborostrata. 5-HT-lir neurites of subepithelial nerve plexus form dense aggregations beneath the frontal organs. b1 High-magnification inset of frontal organs (asterisks) in K. alborostrata. Abbreviations: an–apical neuron; at–apical tuft

Back to article page

Frontiers in Zoology

ISSN: 1742-9994