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mx id: 499 | OBO id: HAO:0000456 | URI: http://purl.obolibrary.org/obo/HAO_0000456
labrum synonyms: labium superius, labral sclerite, labrum superius, upper lip
Defined (both definition and relationships must be met)
Definition:
The sclerite that is situated along the distal margin of the clypeus and is connected along its proximal margin with the distal margin of the epipharyngeal wall.
written by: Vilhelmsen, L., and I. Miko. 2010. Curators/Head..

Relationships / properties:
The labrum is a sclerite.
The labrum is part of the cuticle. The labrum is part of the mouthparts.

Figures
Aleiodes terminalis Cresson, 1869
Psix
Trimorus bohemicus Masner
Entomacis cepa Yoder, 2004
Copyright ©Matthew J. Yoder
Entomacis cepa Yoder, 2004
Copyright ©Matthew J. Yoder
Opius dissitus Muesebeck

Label usage (sensu)
labrum by Snodgrass, R. E. 1935. Principles of insect morphology. McGraw-Hill Book Co., Inc., New York & London 667 pp.
labral sclerite by Curators, H. A. O. 2009. The Hymenoptera Anatomy Ontology Curation Team. Hymenoptera Anatomy Ontology.
labral sclerite by Evans, H. E. 1987. Chapter 27 Order Hymenoptera. Pp. 597-710 in: Immature Insects, vol. 1 (F. W. Stehr, ed.). Kendal/Hunt,Dubuque, Iowa. 754 pp.
labrum by Deans, A. R. 2009. HAO curator..
labrum by Karlsson, D., and F. Ronquist. 2012. Skeletal Morphology of Opius dissitus and Biosteres carbonarius, with a Discussion of Terminology and Morphological Variation in Opiinae (Hymenoptera: Braconidae). PLoS ONE 7:1-38.
labrum by Kirby, W., and W. Spencer. 1828. An introduction to Entomology: or elements of the natural history of insects. Longman, Rees, Orme, Brown & Green, London 732 pp.
labium superius by Zombori, L., and H. Steinmann. 1999. Dictionary of Insect Morphology. Handbuch der Zoologie 4:1-404.
labrum superius by Zombori, L., and H. Steinmann. 1999. Dictionary of Insect Morphology. Handbuch der Zoologie 4:1-404.
upper lip by Zombori, L., and H. Steinmann. 1999. Dictionary of Insect Morphology. Handbuch der Zoologie 4:1-404.
Comments and tags
alternative definition added over 9 years ago by Istvan Miko
Unpaired, dorsomedian sclerite of the mouthparts that is concealed under or partly to entirely exposed below the clypeus; the labrum is usually flap-like but sometimes is deeply emarginate so as to be digitate, that is, with finger-like projections.
  Reference: Gibson , G. A. P., J. D. Read , and R. Fairchild. 1998. Chalcid wasps (Chalcidoidea): illustrated glossary of positional and morphological terms ..
  Cross reference: None provided.

alternative definition added almost 10 years ago by Andy Deans
The anterior, medial appendage of the mouthparts attached to the underside of, and often concealed by, the clypeus.
  Reference: Goulet, H., and J. T. Huber. 1993. Hymenoptera of the World: An Identification Guide to Families. Research Branch, Agriculture Canada Publication 1894/E., Ottawa, ON 668 pp.
  Cross reference: None provided.

alternative definition added over 7 years ago by Kelly Dew
The preoral, unpaired, dorsomedian lobe of the mouthparts that often is concealed under or partly to entirely exposed below the clypeus; suspended from the clypeus with muscles arising to the cranium.
  Reference: Karlsson, D., and F. Ronquist. 2012. Skeletal Morphology of Opius dissitus and Biosteres carbonarius, with a Discussion of Terminology and Morphological Variation in Opiinae (Hymenoptera: Braconidae). PLoS ONE 7:1-38.
  Cross reference: None provided.

alternative definition added over 12 years ago by Andy Deans
the preoral lobe of the head suspended from the clypeus, with muscles arising to the frons
  Reference: Snodgrass, R. E. 1935. Principles of insect morphology. McGraw-Hill Book Co., Inc., New York & London 667 pp.
  Cross reference: None provided.

alternative definition added over 12 years ago by Andy Deans
freely attached, through membrane, to the clypeus, which in the Hymenoptera overhangs the labrum anteriorly. The labrum is more than half as wide as the clypeus and as wide as, or wider than high. The tips of the mandibles lie posterior to the labrum. The labrum has coarse setae (macrotrichia).
  Reference: Vilhelmsen, L. 1996. The preoral cavity of lower Hymenoptera (Insecta): comparative morphology and phylogenetic significance. Zoologica Scripta 25:143-170.
  Cross reference: None provided.


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