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Related to hydrozoans: anthozoans, scyphozoans
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Synonyms for Hydrozoa

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This corresponds to ~9% (26 of 295 species recorded) and less than 1% (26 of 3,428 species recorded) of the hydrozoan species recorded for the Argentinean Patagonia and worldwide, respectively (Oliveira et al, 2016; Schuchert, 2016), showing that the knowledge on the biodiversity of hydroids at intertidal habitats of Argentinean Patagonia is still scarce.
Nevertheless, there is no reason to believe that the cnidocyte of Physalia is different from the ones in other hydrozoans (Purcell and Anderson, 1995; Anderson et al.
Jellyfish and their relatives the box jellies and hydrozoans are very simple animals.
Thimble-shaped hydrozoans have a velum, a sort of muscular shelf at the inner edge of the bell, that boosts propulsive power by providing a stiff collar through which to blast the water.
The pink tentacles emerge from Frilled Anemones, the flower-like beauties at mid-right are Strawberry Hydrozoans, the fish (and partial ones) on the upper left is a cod, and the monster in the middle is a wolffish, better known as an ocean catfish.
Some filter-feeders, such as sponges, some hydrozoans, and bryozoans are less conspicuous than mussels and barnacles.
Most heritability estimates published for clonal animals such as aphids (Via 1994), cladocerans (Parejko and Dodson 1991; Spitze 1992), and hydrozoans (Yund 1991) are broad-sense heritabilities.
The corals were mainly scleractinians, but also included a few zoanthids, alcyonarians, and stony hydrozoans.
turtles, sea snails, hydrozoans, fish species like sea bream damaging molluscs) (seven producers); extreme events like floods (rain falls anomalies with strong inflows of freshwater) (one producer), and storms characterized by strong winds, high waves and strong ocean currents (one producer); and changes in water salinity (one producer).
The role of cAMP in oocyte maturation and the role of the germinal vesicle contents in mediating maturation and subsequent developmental events in hydrozoans.
In our categorization of corals we include scleractineans corals, soft corals and hydrozoans (genus Millepora).
The filaments of Trichodesmium are visible to the naked eye, and support other organisms, such as hydrozoans and even fungi, which potentially make them a kind of pelagic lichen.
Their goal is not to catch fish but to haul in hard data documenting trawling's impact on tube worms, sponges, anemones, hydrozoans, urchins, and other denizens of the deep.