cyclostome


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cyclostome

  1. any member of the order Cyclostomata, a group consisting of lampreys and lungfish, characterized by the lack of jaws and the presence of a suctorial mouth.
  2. a suborder of Polyzoa possessing a tubular body wall and lacking an operculum.
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Comparative Ecology of Bryozoan Radiations: origin of novelties in cyclostomes and cheilostomes.
Competition, clade replacement, and a history of cyclostome and cheilostome bryozoan diversity.
Stenolaemates, including the cyclostomes, form their skeletons almost entirely of low-Mg calcite; mineralogical complexity is provided by the gymnolaemate cheilostomes (Smith et al.
Among all extant forms of bryozoans, paleontological, morphological, and molecular phylogenetic evidence suggests that the ctenostome bryozoans are basal to both the cyclostome and cheilostome grades (Taylor, 1990; Dick et al.
Lampreys are jawless vertebrates (agnathans) and the most primitive representatives of the cyclostome branch from which it is feasible to obtain embryos routinely.
Cyclostome and cheilostome marine bryozoans, two clades with such attributes, have co-occurred in similar environments for 150 million years.
The lamprey, which is a cyclostome, has spermatozoa that carry a spherical acrosomal vesicle at the anterior end of their heads, subacrosomal material between the acrosome and the nucleus, and a long perforatorium rod through the nucleus (Follenius, 1965; Stanley, 1967; Nicander and Sjoden, 1971; Jaana and Yamamoto, 1981) [ILLUSTRATION FOR FIGURE 6B OMITTED].
Recent research on the skeletal ultrastructure of cyclostome bryozoans has revealed an unanticipated diversity of calcitic fabrics (e.
The first volume of the series, published in 1948, covered lancelets, cyclostomes, and sharks.
Contract notice for Pisitigude and cyclostomes spread clarification 2016-2017.