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Hydrozoa (hydrozoans; from
Ancient Gr**** ὕδωρ (húdōr) 'water' and ζῷον (zôion) 'animal') is a
taxonomic class of
individually very small,
predatory animals...
- sea pens);
swimming Scyphozoa (jellyfish);
Cubozoa (box jellies); and
Hydrozoa (a
diverse group that
includes all the
freshwater cnidarians as well as...
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Siphonophorae (from Gr**** siphōn 'tube' +
pherein 'to bear') is an
order within Hydrozoa,
which is a
class of
marine organisms within the
phylum Cnidaria. According...
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Schuchert P, ed. (2012). "Turritopsis
dorhnii (Weissmann, 1883)".
World Hydrozoa Database.
World Register of
Marine Species.
Retrieved November 29, 2012...
- Cnidaria, and is
often considered a subphylum. It
includes the
classes Hydrozoa, Scyphozoa,
Staurozoa and Cubozoa, and
possibly the
parasitic Polypodiozoa...
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individual is
actually a
colony of
hydrozoan polyps. The
taxonomic class,
Hydrozoa,
falls under the
phylum Cnidaria,
which includes anemones, corals, and...
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Velella is a
monospecific genus of
hydrozoa in the
Porpitidae family. Its only
known species is
Velella velella, a
cosmopolitan (widely distributed) free-floating...
-
redescription of the
Portuguese man-of-war,
Physalia physalis (Cnidaria,
Hydrozoa, Siphonophorae, Cystonectae) from Brazil". Iheringia. Série Zoologia. 97...
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related more
closely to
scyphozoan jellyfish than
either are to the
Hydrozoa.
Hydrozoa medusae also have tetra-radial symmetry,
nearly always have a velum...
-
while the
medusa stage is a singular,
planktonic organism.
Generally in
hydrozoa the
medusa develops from the a****ual
budding of the
polyp and the polyp...
