to pass through the tight confines of the birth canal. During childhood development, the skull bones remain somewhat separated, allowing for growth of the brain and skull. Upon reaching maturity, our skull bones fuse to produce a rigid protective shell for the soft nervous tissue of our brain....
The skull contains all the bones of the head and is a shell for the brain and the origins of the central nervous system. A first glance shows that this is one large mass of detailed and irregular bone. Upon closer inspection however, it seems that it is intricately constructed of many sm...
There is a large body of morphoanatomical information dating from the beginning of the last century, and only biological (rather than soft-part anatomical) detail has been added since. For our initial study on pteropod morphoanatomy we have selected the potentially basal orthoconch genus Creseis ...
Most orbitestellid characters reflect plesiomorphic conditions among the Heterobranchia; autapomorphies of the family include an orthostrophic protoconch, massive jaws, a diagnostic radula type, paired posterior pedal glands with a common opening, and a pedally innervated copulatory organ. In ...
Anatomy and systematics of bathyphytophilid limpets (Mollusca, Archaeogastropoda) from the northeastern Pacific The anatomy of B. diegensis was investigated by means of semithin serial sectioning and graphic reconstruction. 'The shell is limpet-like; the protoconch... G Haszprunar,JH Mclean - ...
(2001) Ecology, shell morphology, anatomy and sperm ultrastructure of the Caenogastropod Pyrgula annulata, with a discussion of the relationship between the 'Pyrgulidae' and Caspian and Baikalian Rissooideans. Limnologica, 31, 289-302.
shell microstructureHyoliths (hyolithids and orthothecids) were one of the most successful early biomineralizing lophotrochozoans and were a key component of the Cambrian evolutionary fauna. However, the morphology, skeletogenesis and anatomy of earliest members of this enigmatic clade, as well as...
The type of protoconch (of Kaiparapelta askewi), the limpet-shaped shell without juvenile coiling, the gill type and the conditions of the gonopericardial cavities are typical lepetelloidean characteristics. Kaiparapelta and other lepetelloidean genera (in particular Osteopelta, Cocculinella ...
Developmental patterns of germ cell migration, size at first maturity, and symbiont acquisition and localisation are presented for the post-larva to adult transition. The smallest mature adult was a male with shell length (SL) 2.35mm. All larger individuals in the series were male (maximum SL ...
The shell structure of pearl oysters, which is fundamentally similar to other bivalves, is also described. It consists of three layers. The outermost layer, the periostracum, is largely composed of quinone-tanned proteins (known as conchiolin). It provides mechanical and fouling protection for ...