译文示例:Invertebrates are animals that neither possess nor develop a vertebral column (commonly known as a backbone or spine), derived from the notochord. This includes all animals apart from the chordate subphylum Vertebrata. Familiar examples of invertebrates include arthropods (insects, arachnids,...
Shells continue to grow as mollusks grow, so the length of time it takes to produce a shell can vary from species to species. Many mollusks go through a larval stage in their development, so the actual start of shell production can differ among species as well. What Are Shells Made of?
In this paper we review and analyze the chromatin condensation pattern during spermiogenesis in several species of mollusks. Previously, we had described the nuclear protein transitions during spermiogenesis in these species. The results of our study show two types of condensation pattern: simple ...
Narwhal Facts: The Fascinating Unicorn Whale of the Arctic Sea Hares, Angels, and Butterflies: Fascinating Gastropods Flamboyant Cuttlefish and Blue-Ringed Octopus Facts
“soft body” Visceral mass – holds most internal organs Cephalopods Have foot attached to their heads Examples: squid, octopus, nautilus and cuttle fish Some have a radula, a tongue-like organ that protrudes from the mouth Many have protective “ink” Have a siphon that helps them move ...