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The Organ of Bellonci in Ostracodes: An Ultrastructural Study of the Rod‐shaped, or Frontal, Organ
Author(s) -
Andersson Anders
Publication year - 1977
Publication title -
acta zoologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.414
H-Index - 37
eISSN - 1463-6395
pISSN - 0001-7272
DOI - 10.1111/j.1463-6395.1977.tb00256.x
Subject(s) - biology , cilium , anatomy , ultrastructure , sense organ , microbiology and biotechnology
Ultrastructural observations of the rod‐shaped organ in Cypridina norvegica and Paraconchoecia elegans indicate homology with the organ of Bellonci of other crustaceans. In C. norvegica the organ is situated close to the ventral cup of the nauplius eye. Distally in the organ, several ciliary ramifications of the sensory neurons protrude into internal cavities formed by bordering cells. Six dendrites, with cell bodies within and in front of the brain, form the proximally bifurcated nerve, which enters the protocerebrum in the region of the medullae terminales. In this species the organ represents the deep receptor of the organ of Bellonci complex. In P. elegans the external part of the organ is situated between the proximal parts of the antennulae. Four dendrites in two groups emerge from the protocerebrum. Distally, they form branching cilia that are in close contact which the cuticle of the organ, thus forming a receptor similar to the superficial receptor of the organ of Bellonci complex of other crustaceans. It is suggested that the terms frontal organ and rod‐shaped organ be abandoned in favour of the term organ of Bellonci.