Jamieson, B.G.M. and Tudge, C.C.
1990b. Dorippids are
Heterotremata: evidence from ultrastructure of the spermatozoa of Neodorippe
astuta (Dorippidae) and Portunus pelagicus (Portunidae)
Brachyura: Decapoda. Marine Biology 106, 347-354.
Ultrastructural comparison between the sperm
of the dorippid crab Neodorippe
astuta (Fabricius, 1793) and the
Portunus pelagicus (Linnaeus, 1766) from
placement of dorippids with portunids and their relatives in the
section of the Eubrachyura (the Heterotremata - Thoracotremata or the
Oxyrhyncha - Cancridea - Brachygnatha assemblage) and not with Ranina
(in the Archaeobrachyura or the Oxystomata). Similarities between
spermatozoa of N. astuta and of P.
pelagicus (and other
Eubrachyura) and R. ranina include:
multi-layered, capsule-bound acrosome vesicle; the electron-dense
capping the vesicle; an invaginated core, or perforatorium; concentric
of the contents of the vesicle; a layer of cytoplasm, between the
vesicle and the nucleus, which contains mitochondria (mostly
lattice-like lamellar complexes or membrane remnants; a diffuse nucleus
is bounded externally by a combined nuclear and plasma membrane and
scanty cytoplasm and the large acrosome vesicle; and lateral arms into
the chromatin extends. Characteristic eubrachyuran features of the N.
sperm absent from R. ranina are
the long perforatorium (short and
a unique subacrosomal chamber in R.
ranina) extending almost to the
presence in the perforatorium of longitudinally arranged convulated
zone of acrosomal rays forming the
outer part of an inner dense zone; the presence of a thickened ring
the basal part of the perforatorium; and, basally, two centrioles
R. ranina but also from some
eubrachyurans). The sperm of N.
similar to that of P. pelagicus
than to that of other investigated
heterotreme status of N. astuta
is thus unequivocally supported. Both
lack the posterior median process seen in the nucleus of majids and R.