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Eucyrtidium matuyamai Hays, 1970

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Cephalis spherical to hemispherical bearing short thorn-like apical spine. Pores either absent or very small scattered over surface. Thorax usually inflated, heavy with rough surface, pores circular arranged in longitudinal rows set in shallow furrows. Fourth segment usually inflated, shell has greatest width at this segment, pores circular of uniform size arranged in longitudinal rows set in shallow furrows. Fifth segment tapering distally, pores circular arranged in longitudinal rows set in shallow furrows decreasing in size distally. Sixth segment short, usually terminal segment in complete specimens, thinner than other segments, pores irregular in size and arrangement.
Length of cephalis 15-23, of thorax 17-30, of 3rd segment 35-50, of 4th segment 36-68, of 5th segment 118-150 (near end of range), 72-110 (near beginning of range). Length of apical horn 3-6. Diameter of pores, thorax 2-6, 3rd segment 3-9, 4th segment 6-12, 5th segment 6-12, 6th segment 3-12.
Hays 1970


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