Haas, M. S.; Brown, S. J.; Beeman, R. W. (2001). "Pondering the Procephalon: the Segmental Origin of the Labrum". Development, Genes and Evolution. 211 (2): 89–95. doi:10.1007/s004270000129. PMID11455419. S2CID2720766.
Posnien, Nico; Bashasab, Fakrudin; Bucher, Gregor (2009). "The insect upper lip (labrum) is a nonsegmental appendage-like structure". Evolution & Development. 11 (5): 480–488. doi:10.1111/j.1525-142X.2009.00356.x. PMID19754705. S2CID9655369.
Du, Xiaoliang; Yue, Chao; Hua, Baozhen (2009). "Embryonic development of the scorpionfly Panorpa emarginata Cheng with special reference to external morphology (Mecoptera: Panorpidae)". Journal of Morphology. 270 (8): 984–995. doi:10.1002/jmor.10736. PMID19274641. S2CID37633533.
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pubmed.ncbi.nlm.nih.gov
Haas, M. S.; Brown, S. J.; Beeman, R. W. (2001). "Pondering the Procephalon: the Segmental Origin of the Labrum". Development, Genes and Evolution. 211 (2): 89–95. doi:10.1007/s004270000129. PMID11455419. S2CID2720766.
Posnien, Nico; Bashasab, Fakrudin; Bucher, Gregor (2009). "The insect upper lip (labrum) is a nonsegmental appendage-like structure". Evolution & Development. 11 (5): 480–488. doi:10.1111/j.1525-142X.2009.00356.x. PMID19754705. S2CID9655369.
Du, Xiaoliang; Yue, Chao; Hua, Baozhen (2009). "Embryonic development of the scorpionfly Panorpa emarginata Cheng with special reference to external morphology (Mecoptera: Panorpidae)". Journal of Morphology. 270 (8): 984–995. doi:10.1002/jmor.10736. PMID19274641. S2CID37633533.
Haas, M. S.; Brown, S. J.; Beeman, R. W. (2001). "Pondering the Procephalon: the Segmental Origin of the Labrum". Development, Genes and Evolution. 211 (2): 89–95. doi:10.1007/s004270000129. PMID11455419. S2CID2720766.
Posnien, Nico; Bashasab, Fakrudin; Bucher, Gregor (2009). "The insect upper lip (labrum) is a nonsegmental appendage-like structure". Evolution & Development. 11 (5): 480–488. doi:10.1111/j.1525-142X.2009.00356.x. PMID19754705. S2CID9655369.
Du, Xiaoliang; Yue, Chao; Hua, Baozhen (2009). "Embryonic development of the scorpionfly Panorpa emarginata Cheng with special reference to external morphology (Mecoptera: Panorpidae)". Journal of Morphology. 270 (8): 984–995. doi:10.1002/jmor.10736. PMID19274641. S2CID37633533.