Hemocyanins are giant extracellular oxygen carriers in the hemolymph of many molluscs.
Hemocyanin transports oxygen in the hemolymph of many molluscs and arthropods and is therefore a central physiological factor in these animals.
Transcriptome sequencing has recently been conducted in many molluscs, providing extensive resources for large-scale gene-associated SNP mining.
Furthermore, polyploidy is common in the somatic tissue of many Molluscs (Anisimov et al. 1995; Tabakova et al. 2005; Tokmakova et al. 2006).
Many molluscs are important fishery and aquaculture species, and some also serve as models for studying neurobiology, biomineralization, and adaptive evolution in response to climate change.
Thus, although many molluscs show expansions of heat shock gene family members [ 51, 52], these may not all be required for response to thermal stress.
However, many molluscs maintain high levels of lysozyme in their gills as a protective mechanism against pathogenesis [ 60], and also the reduced peptidoglycan biosynthesis pathways in these genomes would make lysozyme-based digestion unnecessary.
With the mentioned characteristics, the species is typical in most regards for many freshwater molluscs and other freshwater invertebrates lacking active long range dispersal capacities.
Neogastropoda include many familiar molluscs, such as cone snails (Conidae), purple dye snails (Muricidae), mud snails (Nassariidae), olive snails (Olividae), oyster drills (Muricidae), tulip shells (Fasciolariidae), and whelks (Buccinidae).
Other characteristics that commonly appear in textbooks have significant exceptions: Because of the great range of anatomical diversity among molluscs, many textbooks start the subject of molluscan anatomy by describing what is called an archi-mollusc, hypothetical generalized mollusc, or hypothetical ancestral mollusc (HAM) to illustrate the most common features found within the phylum.
