| 11. | The pygidium ends in a striking tail spike.
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| 12. | Both the cephalon and the pygidium lack spines.
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| 13. | It is the highest point of the pygidium.
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| 14. | The pygidium ends in downward pointing toothlike spines.
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| 15. | Its headshield ( or pygidium ) consists of four rings and a minute endpiece.
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| 16. | Its pygidium is small, with 2 anal cirri, similar to its dorsal cirri.
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| 17. | "Pygidium " is also a superseded genus of fish of the family Trichomycteridae.
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| 18. | Along the margins of the pygidium are a pair of very small backward-pointing spines.
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| 19. | Like all Raphiophorids it is blind, with a headshield ( or pygidium are strongly segmented.
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| 20. | It is named for the spines on the pygidium, which give it a serrated impression.
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