The term sternum (plurality sterna), specifically also sternite ( ancient Greek στέρνον Sternon , breast '), means one or more abdominal or thoracic side ( ventral ) sclerotized Chitin the exoskeleton of some arthropods .
In insects, the term sternum refers to the ventral sclerites (hardened parts of the exoskeleton) between the two pleurs . The three sternas of the thoracic section - the Prosternum , Mesosternum and Metasternum - are referred to as parts of the body segmentation .
Any other ventral sclerite, i.e. H. any sclerotized area that is secondary to the sternum is unspecifically termed a sternite or abdominal plate. A sternite in the chest is called a belly sternite or thoracic sternite . A sternite the abdomen (abdomen) is Hinterleibssternit or Abdominalsternit even Urosternit called. The last abdominal sternite is called the apical sternite .
The acrosternite (Gr. Άκρον, the top, the top ') is a mostly narrow strip at the front edge of the sternite, which morphologically belongs to the preceding sternite and is separated from it by a secondary intersegment membrane. Stripes attached at the back are called Poststernit . Acro- and Poststernites belong to the Intersternites . These are original intersegmental skins that are heavily sclerotized and form an additional sternite. Coxosternite is the name given to separated laterally lying parts of the abdominal sternite . As Laterosternit (also Pleutosternit or Sternopleurit ) of the ventral side subsequent to the primary sternum prior to hip skeletal part is referred to. Coxosternites and laterosternites are combined as pleural sternites . As Endosterniten refers to the chitinous structures of a sternite, which are located on the inside of the body.
In arachnids , the chest plate of the front body is called the sternum. The hardened undersides of the more or less overgrown abdominal segments of the arachnids are called sternites, their upper sides tergites . Internal skeletal parts in the prosoma of spiders are called endosternite . The scorpion's sternum has long been considered one of their most important taxonomic features.
In crustaceans , too , the abdominal area of the exoskeleton between the limbs of each segment is called the sternite. While the sternum is the surface formed by all sternites.
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- Joel Martin: Sternite. In: Crustacea Glossary. Natural History Museum Los Angeles County, accessed August 6, 2012 .
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