The ultrastructure of the sperm of the Subfamily
Nephropinae, exemplified by Nephrops
norvegicus (Chevaillier and Maillet, 1965) is
essentially similar to that in the Homarinae described
above. There are again three nuclear
processes containing a complex system of
lamellae but remarkably, unlike homarine
sperm, the processes lack microtubules. Only the
basal part of the spine contains lamellae and is
Feulgen (DNA) positive. The acrosome ('capsule')
is elongate and consists of a peripheral
region and an axial baton. The baton is here
interpreted as the homologue of the subacrosomal
material or perforatorium in homarines,
differing in being (like the entire acrosome)
much more elongate. This is bounded by a space
(here considered the equivalent of the central
canal of H. vulgaris) surrounded by an inner
fibrillar and, external to this, a homogeneous
layer together probably equivalent to the inner
acrosomal material (central column) in Homarus.
It is proteinaceous and PAS negative.
The peripheral region is clearly the homologue
of the outer acrosomal region and, like it, is
PAS-positive. A proteinaceous 'apical granule'
is possibly the equivalent of the homarine apical
The ultrastructure of the sperm of the SubfamilyNephropinae, exemplified by Nephropsnorvegicus (Chevaillier and Maillet, 1965) isessentially similar to that in the Homarinae describedabove. There are again three nuclearprocesses containing a complex system oflamellae but remarkably, unlike homarinesperm, the processes lack microtubules. Only thebasal part of the spine contains lamellae and isFeulgen (DNA) positive. The acrosome ('capsule')is elongate and consists of a peripheralregion and an axial baton. The baton is hereinterpreted as the homologue of the subacrosomalmaterial or perforatorium in homarines,differing in being (like the entire acrosome)much more elongate. This is bounded by a space(here considered the equivalent of the centralcanal of H. vulgaris) surrounded by an innerfibrillar and, external to this, a homogeneouslayer together probably equivalent to the inneracrosomal material (central column) in Homarus.It is proteinaceous and PAS negative.The peripheral region is clearly the homologueof the outer acrosomal region and, like it, isPAS-positive. A proteinaceous 'apical granule'is possibly the equivalent of the homarine apical
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