Order Myliobatidiformes — Round Stingrays—Family Urolophidae Round Stingray from the Ferry Landing Pier in Coronado, 2013.

They are active daytime feeders.

Called raya de espina, raya redonda común, or raya redonda de aguijón in Mexico. The back of this species is brown, often mottled or spotted, and the underside it is white to orange.
It can be distinguished from the others since it is the only one with a true tail fin.

Round Stingray Round Stingray. The others have either a whip-like tail or very short tail with no fin membrane.

Mike Granat and a Round Stingray from Crystal Pier in San Diego (Top View) The mucous sheath contains toxin cells that rupture upon impact, says Lowe, whose research has examined the topic.
The genus name, Urobatis , is based on two Greek words, oura’ and batis’ that translate as tail and ray. A stingray's stinger is coated in a venomous mucous sheath.

And Salinity range of 27-33 ppt or 1.020-1.024. Their coloring is light to dark brown on top with a whitish yellow bottom.

Stingray pectoral fin locomotion can be divided into two categories: undulatory and oscillatory. Called stingrocka in Sweden, which seems appropriate because a sting will […] Identification: Round stingrays have an almost circular disk with the tail being shorter than the disk; there’s a long, sharp, venomous spine mid-length on top of the tail. The common stingray (left) is an East Coast ray, while the round stingray (right) is a West Coast local. The round stingray has a nearly circular disc-shaped body (width 3-10 inches) with a tail that is shorter than the length of the disc.

... • The round ray is small but feared because of its stinger.

The round stingray is one of six rays found in California waters which have a stinger on the tail. In Lowe's lab, a round stingray hides at the sandy bottom of a tank. These smaller stingrays have an almost circular pectoral disc, with a slightly rounded point at the snout, and a short tail that lacks dorsal fins but does have a small caudal (tail) fin, which is unusual for rays. Average Adult Size: about 15.0 inches (38 cm) TL, or about 9.8 inches (25 cm) Identification: Round stingrays have an almost circular disk with the tail being shorter than the disk; there’s a long, sharp, venomous spine mid-length on top of the tail. Activity level: a fairly active species of stingray. The stingray uses its paired pectoral fins for moving around.

Beware of the stinger.

Left image: ... protein-based venom covering the stingray’s barbed stinger. Spines, when lost, are regenerated. ... Video: Round stingrays like this one will bury themselves in the sand in shallow water.

Preferred Water Temperature & Conditions: They seem to prefer a water temperature range of 72-82 F (23-28 C). The stingray's spine, or barb, can be ominously fashioned with serrated edges and a sharp point.

The California Stingray or Round Stingray is one of six rays found in California waters which have a stinger on the tail.

It can swing its tail around to bring its spine into play and drive it home. Beware of the stinger.

Alternate Names: Stingray, stingaree or stinger. This is in contrast to sharks and most other fish, which get most of their swimming power from a single caudal (tail) fin.

Stingrays who use undulatory locomotion have shorter thicker fins for slower motile movements in benthic areas.


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