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The pelvis is, in general, different between the human female and male skeleton. [14] [15] Although variations exist and there may be a degree of overlap between typically male or female traits, [14] [15] the pelvis is the most dimorphic bone of the human skeleton and is therefore likely to be accurate when using it to ascertain a person's sex ...
During the breeding season, males of various stingray species such as the round stingray (Urobatis halleri), may rely on their ampullae of Lorenzini to sense certain electrical signals given off by mature females before potential copulation. [19] When a male is courting a female, he follows her closely, biting at her pectoral disc.
The Atlantic stingray was described by French naturalist Charles Alexandre Lesueur as Trygon sabina, in an 1824 volume of the Journal of the Academy of Natural Sciences of Philadelphia. He based his account on a damaged male specimen collected by American naturalist Titian Ramsay Peale during the Academy's 1817 expedition to Florida. [5]
A female stingray who gained national attention after she became pregnant despite not having a male companion has developed a rare reproductive disease, according to the aquarium where she resides.
The Colares stingray has a diamond-shaped pectoral fin disk about as long as wide, with rounded margins and a long snout that tapers to a point. The snout of the female is shorter than that of the male, and snout edges dip in slightly near the tip. The eyes are small and followed by large spiracles.
A stingray that got pregnant at a North Carolina aquarium this winter despite not having shared a tank with a male of her species for many years has died. The Aquarium and Shark Lab in ...
A North Carolina aquarium that said it had a pregnant stingray with no male companion now says the fish has a rare reproductive disease. Thursday's statement from the Aquarium and Shark Lab in ...
The pelvic fins are small with rounded margins; claspers are found on males. The tail is shorter than to about equal to the disc, either flattened or thickly oval in cross-section, and ends in a leaf-shaped, symmetrical caudal fin. One or two relatively large, serrated stinging spines are placed atop the tail about halfway along its length.