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Trilobozoa (meaning "three-lobed animals") is a phylum of extinct, sessile animals that were originally classified into the Cnidaria. The basic body plan of trilobozoans is often a triradial or radial sphere-shaped form with lobes radiating from its centre. [1] Fossils of trilobozoans are restricted to marine strata of the Late Ediacaran period.
Physically the shells are oval and cylindrical in shape. They have a well-developed stepped spire. Olive shells have a siphonal notch at the posterior end of the long narrow aperture. The siphon of the living animal protrudes from the siphon notch. The shell surface is extremely glossy because in life the mantle almost always covers the shell ...
Ichthyostega was a fairly large animal for its time, as it was broadly built and about 1.5 m (4.9 ft) long. ... Ichthyostega, with an oval-shaped neck and limbs.
The mouth is at the base of the animal and the anus at the top; the lower surface is described as "oral" and the upper surface as "aboral". [a] [2] Several sea urchins, however, including the sand dollars, are oval in shape, with distinct front and rear ends, giving them a degree of bilateral symmetry.
The caudal fin of the ocean sunfish is replaced by a rounded clavus, creating the body's distinct truncated shape. The body is flattened laterally, giving it a long oval shape when seen head-on. The pectoral fins are small and fan-shaped, while the dorsal fin and the anal fin are lengthened, often making the fish as tall as it is long.
Triggerfish have an oval-shaped, highly compressed body. The head is large, terminating in a small but strong-jawed mouth with teeth adapted for crushing shells. The eyes are small, set far back from the mouth, at the top of the head. The anterior dorsal fin is reduced to a set of three spines. The first spine is stout and by far the longest.
The term oval when used to describe curves in geometry is not well-defined, except in the context of projective geometry. Many distinct curves are commonly called ovals or are said to have an "oval shape". Generally, to be called an oval, a plane curve should resemble the outline of an egg or an ellipse. In particular, these are common traits ...
Ovalipes catharus has an oval-shaped, streamlined, and slightly grainy carapace with five large, sawtooth-like projections to either side of the eyes and four smaller ones at the front. [ 1 ] [ 14 ] [ 20 ] The carapace has two large, maroon eyespots at the rear, two smaller eyespots near the front, and cervical grooves which form a butterfly ...