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Phylogenetic significance of the ventral nerve cord in the Chrysomeloidea (coleptera: Phytophaga)
Author(s) -
MANN J. S.,
CROWSON R. A.
Publication year - 1983
Publication title -
systematic entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.552
H-Index - 66
eISSN - 1365-3113
pISSN - 0307-6970
DOI - 10.1111/j.1365-3113.1983.tb00468.x
Subject(s) - biology , longhorn beetle , anatomy , phylogenetic tree , ganglion , ventral nerve cord , zoology , neuroscience , nervous system , genetics , gene
The ventral nerve cord of adult Chrysomeloidea exhibits variation in the degree of fusion of the meso‐and metathoracic ganglia. similar variation occurs also in the ganglia ofthe abdominal chain, and in the single or double connectives between them. In adult Chrysomeloidea (and Curculionoidea) there never seem to be more than five separate abdominalganglia, the first two being more or less fused to the metathoracic ganglion and the lasttwo more or lessconnate; the supposed primitive condition is retained in some Cerambycidae. Trends toward the fusion of aditional abdominal ganglia appear in several differentlines in Chrysomelidae (and in Cerambycidae), and in more than one line a conditiones is reached in which only the ganglion in the third abdominal segmetn remains free. Structures possibly representing ‘perisynmpathetic organs’ have been observed in a few of the seventy‐eight European and Indian species studied. systematic and phylogenetic conclusions are drawwn.