Systema Naturae includes representatives of every major lineage of the animal phylum
Cnidaria. However, Linnaeus did not classify the members of the phylum as is now done …

Background Cnidaria (corals, sea anemones, hydroids, jellyfish) is a phylum of relatively
simple aquatic animals characterized by the presence of the cnidocyst: a cell containing a …

The fresh water polyp Hydra provides textbook experimental demonstration of positional
information gradients and regeneration processes. Developmental biologists are thus …

Leptothecata are hydrozoans whose hydranths are covered by perisarc and gonophores
and whose medusae bear gonads on their radial canals. They develop complex polypoid …

Fifty‐six sequences of the mitochondrial 16S RNA gene were generated for hydroids,
belonging to six nominal families—Eudendriidae, Lafoeidae, Haleciidae, Sertulariidae …

Identification of hydrozoan species is challenging, even for taxonomic experts, due to the
scarcity of distinct morphological characters and phenotypic plasticity. DNA barcoding …

Two fundamental life cycle types are recognized among hydrozoan cnidarians, the benthic
(generally colonial) polyp stage either producing pelagic sexual medusae or directly …

The marine hydroid Plumularia setacea has a near-cosmopolitan distribution. As in other
sessile invertebrates with limited dispersal abilities, the wide distribution could also be a …

The diversity of hydrozoan life cycles, as manifested in the wide range of polyp, colony, and
medusa morphologies, has been appreciated for centuries. Unraveling the complex history …

Hydroidolina is a group of hydrozoans that includes Anthoathecata, Leptothecata and
Siphonophorae. Previous phylogenetic analyses show strong support for Hydroidolina …