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Psychopyge
''Psychopyge'' is a genus of trilobite, that lived during the upper Emsian (or Upper Devonian) and has been found in Germany (''P. psyche'') and Morocco. It is characterized by the swordlike extension from the front of the head.
== Description ==
Like all sighted Phacopina, ''Psychopyge'' has schizochroal eyes, the frontal lobe of the central raised area of the headshield (or cephalon), called glabella is expanded forward, lacks a rostral plate (the midfrontal part of the “seam” visible from the ventral side, defined by sutures), and the articulate middle part of the exoskeleton (or thorax) has 11 segments. Like all Asteropyginae, ''Psychopyge'' has (in this case 5 pairs) prominent spines (or lappets) extending from the segments of the tailshield (or pygidium) in the area outside the axis (or pleural region). The frontal lobe of the glabella is rounded, the border carries a long flat sword-shaped forward pointing extension. The furrows dividing the frontal lobe of the glabella is curved inward and backward. The eyes have 9–10 lenses per vertical row (or dorsoventral file). The eye does not touch the border furrow at the back of the cephalon, and there is no platform below the eye. The large spines at the back corners of the cephalon (genal spines) are longer than glabella. There is a long vertical spine on the part of the glabella that corresponds with the border (called occipital ring), gradually curving backward. There are no spines between the genal spines and the glabella (or metafixigenal spines). The pygidium has 19-21 axial rings, each with a spine on its midpoint. The part of the pygidium outside the axis (or pleura) has 5–6 segments that get longer further to the back, with rounded pleural bands, clearly incised furrows between the bands and vertical spines near where each posterior band converts into a lappet. There are 5 pairs of lappets that grow only from the posterior pleural bands, and are longer than the corresponding pleural bands.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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