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The phylum is commonly divided into three taxa, the articulate Rhynchonelliformea and the two inarticulate clades Craniiformea and Linguliformea ( 4 ), and has traditionally been grouped together with Phoronida and Ectoprocta into the superphylum Lophophorata.
The larvae of gymnolaemates have been broadly grouped into three types, cyphonautes (shelled, feeding), pseudocyphonautes (shelled, nonfeeding), and coronate (unshelled, nonfeeding), although each group is heterogeneous and probably includes various morphologies that are largely undescribed.
This chapter provides explanations that are dependent upon a particular and special ecologic or taxonomic history. Because relative uniformity of the environment reinforces specialization and leads to speciation, any given character complex, or lineage, will, on the average appear through time to go from the r to the K end of the spectrum.
GLOSSARY FOR THE BRYOZOA Under Construction! acanthopore See style acanthostyle In cryptostomes, a type of stylet with a core which is a well-defined smooth rod of non-laminated calcite. Sheath lamellae usually strongly directed toward colony surface, sheath lamellar bundle wide.
Background. Two theories for the origin of animal life cycles with planktotrophic larvae are now discussed seriously: The terminal addition theory proposes a holopelagic, planktotrophic gastraea as the ancestor of the eumetazoans with addition of benthic adult stages and retention of the planktotrophic stages as larvae, i.e. the ancestral life cycles were indirect.
In amphipods, morphological adaptations for feeding provide taxonomic evidence that helps to differentiate them into species. Intuitively, this indicates that the morphology of feeding structures may be related to the type of food the amphipods consume, and that their distribution would depend on the distribution of their food. These hypotheses were examined using zooplankton collections from.
The Zealandian Region centred on New Zealand has the highest diversity of Cellaria species in the world, with three described and 11 undescribed living species.
The ovum in its young condition is obviously nothing but a simple cell; and such it remains till the period when it attains maturity. Nevertheless the changes which it undergoes in the course of its growth are of a very peculiar kind, and, consisting as they do in many instances of the absorption of other cells, have led various biologists to hold that the ovum is a compound structure.
It contains chapters on the discovery of bryozoans, their morphology, classification and fossil history, their roles in biosecurity and marine benthic environments, and potential uses in biotechnology and ocean acidification. It provides an authoritative reference for biology students, academics and others interested in marine biology.
To learn how to write a classification essay you just need to keep your head upon the surface of finding and classifying things. The best thing about this particular paper type is of its diversity and ways to develop. You can easily get the highest grade even if your topic is absolutely unfamiliar to you.
Mandible morphology obtained with SEM photography and morphometric analyses were used to infer feeding habits. The mandible of P. pacifica has a wide molar indicative of microphagous habits and a cutting incisor related to carnivorous habits, while in C. chalkngeri, strong molar and sharp incisor in the mandible indicate carnivorous habits.