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1.  Morphology
His body was shaped flat dorsal – ventral rounded pinna dorsalis do not a pair of prima
pactorolis and there is are additional tool in the near anus which clasper (male genetalia) are
useful at the time of maiting season arnius contained as much as 5 points of gill sliks. The mouth
is located in the anterior ventral side of they head. Anus in the posterior. The body is covered by
placoid scales.
 Anatomy
- Digestive system
Covered by dental jaw. Digestive tract consist of the cavum oris, pharinks, esophagus,
ventriculus, intestine, cloaca and anus. Liver and pancreas with bile duct that is open the
duodenum.
- Respiratory system
5 pairs of gills have less direct empties out. The blood the ventral aorta going through the
gill capillaries, releasing Co2 and O2 binding.
- Circulatory system
The heart has an atrium that receives blood from the dorsal sinus venosus and the ventricle
thar receives blood and pumps blood into the corical arterious. Of the cone, then the blood
to the ventral aorta broaching. Existing capillaries in the gills come together to for from the
dorsal aorta, and then through the body blood into the venous blood returned through two
channels cauvien and into the sinus venosus.
- Reproduction system
Internal fertilization. Male stingrays have a tool called a clasper copulation, clasper is
modification of and or pelvic fins, the female has a pair of ovaries near the anterior end of
the abdominal cavity. The egs were cooked to escape through the membrane into the
membrane into the ovary and the funnel-shape ostium, continued into the oviduct. At the
posterior end of the oviduct is a developing embryo to swim.
Note :
Klasifikasi
Kingdom : animalia
Phylum : chordate
Classis : choridaritithyes
Ordo : rajida
Familia : -
Genus : dasyatus
Species : dasyatus Sabina
(jasin, 1992)