-
equiradiate triactines and
diactines. The
actines of the
triactines are conical,
slightly undulated and sharp.
Diactines are
straight and one of the...
-
large diactines with a
break on the middle, and
parasagittal triactines with a very long
unpaired actine and
short paired actines.
Irregular diactines of...
-
calcareous sponges with the
skeleton either composed exclusively of micro-
diactines, or in
which microdiactines constitute exclusively or
predominantly a...
-
calcareous sponge ****ules can be of
three basic types: monaxonic, two-tipped
diactines,
triactines with
three ****ules rays, and four-ra**** tetractines. Specialized...
- equiradiate)
triactines and tetractines. However,
tetractines are more rare.
Diactines may be added.
Asconoid aquiferous system.
Arturia canariensis, for example...
- mushroom-like. ****ules
protruding beyond the
sponge surface, when present, are
diactines (****ules with two
pointed arms) or
specialised outwardly protruding hypodermal...
- they
always have
sharp tips. Sometimes, they are
slightly undulated.
Diactines are
abundant on the
external tubes; they are
curved or straight, vary...
- osculum. The
surface of the
tubes is
hispid because of the
presence of
diactines and trichoxea.
Cells with
granules have not been observed. The skeleton...
-
exceptionally regular. In
ontogeny the
first ****ules to be
secreted are
diactines.
Choanocytes are apinucleate.
Calcaronea have
amphiblastula larvae World...
- and
orthotropal tangential rays. The
choanosomal skeleton is made of
diactines (two ra**** ****ule with rays
aligned on the same axis), and
rarely hexactines...
