| 21. | The pygidium is papillated, with two anal cirri twice as long as the dorsal cirri.
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| 22. | A female adds to the turrets with its pygidium after bringing mud from inside the nest.
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| 23. | Segments are added at the posterior part of the pygidium but, all segments remain fused together.
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| 24. | The species " M . pectoralis " looks similar, but its pygidium is rounded.
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| 25. | The headshield ( or pygidium ) is 20 to 35 % of the length of the body.
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| 26. | The 20 or so segments of the pygidium are poorly defined, as they are fused together.
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| 27. | Determining a junction between thorax and pygidium can be difficult and many segment counts suffer from this problem.
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| 28. | Both the cephalon and the pygidium are highly ornamented with radiating patterns of furrows, resembling a net.
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| 29. | Its pygidium is small, with 2 anal cirri, similar to its dorsal cirri but rather longer.
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| 30. | The first is reduced and forms the pedicel, while the last three are constricted, forming the pygidium.
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