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Dalmanites Trilobite Replica measures 12.8×7 inches. Dalmanites Trilobite Replica is museum quality polyurethane cast. Made in USA. Location: Tennessee. Age. Silurian Advanced giant phacops of Silurian Tennessee.
Dalmanites is a genus of trilobite in the order Phacopida. They lived from the Late Ordovician to Middle Devonian.
The Dalmanites trilobites of this genus have slightly convex exoskeletons with an average length of 1.5 to 3 in. The cephalon is semicircular or parabolic. The glabella (center portion of the head) is often pear shaped, and tapers outward toward the front.
The glabella also always contains three pairs of obvious glabellar furrows. Also prominent are the large mosaic (schizochroal) eyes.
The Dalmanites trilobites thorax is composed of eleven segments, with the relatively large pygidium with a slender axis of 11 to 16 rings and 6 or 7 pleural ribs. The pygidium ends in a striking tail spike.
Dalmanites trilobites is genus of trilobites with an average (about 8 centimetres or 3.1 inches long), moderately vaulted exoskeleton with an inverted egg shaped outline (about 1.5× longer than wide).
Its headshield (or cephalon) is semicircular, with robust (genal) spines extending from the side of the cephalon back to approximately the 8th thorax segment.
The frontal margin of the cephalon is semicircular to parabolic, and it may have a simple and short anterior extension. Dalmanites trilobites facial suture lies inside or touches the preglabellar furrow. The frontal lobe of the central raised area of the cephalon (or glabella) is much wider than the other lobes.
The frontal lobe is vaulted. The eye is moderate to large, about half as long as the cheek. The “seem” that is visible from the ventral side (or doublure) is wide and flat, and has a deep and wide antennal furrow.
The Dalmanites “palate” (or hypostome), also only visible from the ventral side, is subtriangular (about as long as wide) and adorned with three weak denticles at its back rim. To the front the hypostome has weak wings extending sideways.
The Dalmanites trilobites thorax consists of 11 segments. The tips of the segments are pointed and angle back increasingly from about 30 percent for the anterior segment to slightly pointing inwards for the posterior segment.
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|12.8 × 7 in