Digestive tract: In most mollusks, the digestive system is complex, starting with the mouth and ending with anus. With the exception of Bivalvia , a radula may be present. This is a unique tonguelike scraping organ that is covered in hundreds, sometimes even thousands of microscopic teeth that primarily are composed of chitin ( Brusca and ...

Internally the monoplacophoran is organized with a long, looped alimentary system, two pairs of gonads, and multiple paired excretory organs (four of which also serve as gonoducts). A bilobed ventricle lies on either side of the rectum and is connected via a long aorta to a complex plumbing of multiple paired atria that in turn are connected to ...

The digestive system of each of the eight extant molluscan classes is reviewed, highlighting the most recent data available on histological, ultrastructural and functional aspects of tissues and cells involved in nutrient absorption, intracellular and extracellular digestion, with emphasis on glandular tissues.

2020年1月9日 · In order to resolve conchiferan relationships and improve understanding of early molluscan evolution, we carefully curated a high-quality data matrix and conducted phylogenomic analyses with broad...

The digestive system is very similar to that of the gastropods. (Please refer to that data for details). The difference is that behind the mouth is a curious cluster of frond-like appendages that serve to push the food into the pharynx. Also the mouth is located in front of the foot and the anus is located posteriorly in the pallial groove.

2020年8月1日 · The monoplacophora radula is described as docoglossate, meaning it has two rows each with a central tooth, three pairs of lateral teeth, and two pairs of marginal teeth. The nervous system is comprised of two pairs of simple ganglia (four in total) that lead into four longitudinal chords.

14.6.3.4 Digestive System. 14.6.3.5 Renopericardial and Reproductive Systems. 14.6.3.6 Nervous System and Sense Organs. 14.6.4 Biology and Ecology. 14.6.4.1 Habits and …

2013年2月1日 · The digestive system of each of the eight extant molluscan classes is reviewed, highlighting the most recent data available on histological, ultrastructural and functional aspects of tissues and...

2009年6月1日 · The story of the discovery and study of the Monoplacophora (or Tryblidia) and how they have contributed to our understanding of the evolution of the Mollusca highlights the importance of ...

2022年7月31日 · Members of class Monoplacophora (“bearing one plate”) posses a single, cap-like shell that encloses the body. The morphology of the shell and the underlying animal can vary from circular to ovate. A looped digestive system, multiple pairs of excretory organs, many gills, and a pair of gonads are present in these animals.