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Comparative analysis and systematic mapping of the labial sensilla in the Nepomorpha (Heteroptera: Insecta).

Brożek J - ScientificWorldJournal (2013)

Bottom Line: Twenty-one morphologically distinct types of the mechanosensilla as well as two types of the trichoid sensilla (contact-chemoreceptive sensillum) have been identified on all labial segments in representatives of subfamilies.In Nepomorpha, morphological ground plan of the labial sensory structures is represented by an apical sensory field with 10-13 pairs of papillae sensilla and the peg-in-pit ones placed more laterally; numerous trichoid sensilla are placed on the IV segment; the chaetica sensilla are present and placed in groups or rows distributed along the labium near the labial groove on the dorsal side, and also several chaetica sensilla are unevenly scattered on the surface of that segment; the cupola and peg sensilla are numerous and evenly scattered on the fourth labial segment; the prioprerecptive sensilla, one pair is positioned on the dorsal side and on the fourth segment of the labium.The new apomorphical characters have been established for the labial sensilla in the Nepomorpha.

View Article: PubMed Central - PubMed

Affiliation: Department of Zoology, Faculty of Biology and Environmental Protection, University of Silesia, Bankowa Street 9, 40-007 Katowice, Poland. jolanta.brozek@us.edu.pl

ABSTRACT
The present study provides new data concerning the morphology and distribution of the labial sensilla of 55 species of 12 nepomorphan families (Heteroptera: Nepomorpha) using the scanning electron microscope. On the labial tip, three morphologically distinct types of chemosensilla have been identified: two types of papillae sensilla and one type of peg-in-pit sensilla. Twenty-one morphologically distinct types of the mechanosensilla as well as two types of the trichoid sensilla (contact-chemoreceptive sensillum) have been identified on all labial segments in representatives of subfamilies. In Nepomorpha, morphological ground plan of the labial sensory structures is represented by an apical sensory field with 10-13 pairs of papillae sensilla and the peg-in-pit ones placed more laterally; numerous trichoid sensilla are placed on the IV segment; the chaetica sensilla are present and placed in groups or rows distributed along the labium near the labial groove on the dorsal side, and also several chaetica sensilla are unevenly scattered on the surface of that segment; the cupola and peg sensilla are numerous and evenly scattered on the fourth labial segment; the prioprerecptive sensilla, one pair is positioned on the dorsal side and on the fourth segment of the labium. The new apomorphical characters have been established for the labial sensilla in the Nepomorpha.

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Types and sizes of the sensilla of the Diaprepocoridae and Micronectidae ((a)–(c) Diaprepocoris zealandiae, (d)–(f) Micronecta quadristrigata). (a) BD (no. 1−2.5) are spread evenly on the dorsal surface. (b) AT in magnification; PES or PAS2 are numerous and unevenly cover the tip. (c) Several of the CH1 are arranged on the lateral edge of the membranous labial tip (AT); the CH1 are placed on the lateral edge of the labium; the CH2 and CH3 are placed below the apex, on the ventral side. (d) BD (no. 1–4) are spread evenly on the dorsal surface; the CH1 are placed on the lateral edge of the labium. (e) BD in magnification, PES, RBS2, and PAS on the apex (AT). (f) The CH1 are numerous and situated below the apex (ventral view), the CH2 are situated in a short row below the CH1, and the CH3 are not numerous and placed below the CH2.
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fig31: Types and sizes of the sensilla of the Diaprepocoridae and Micronectidae ((a)–(c) Diaprepocoris zealandiae, (d)–(f) Micronecta quadristrigata). (a) BD (no. 1−2.5) are spread evenly on the dorsal surface. (b) AT in magnification; PES or PAS2 are numerous and unevenly cover the tip. (c) Several of the CH1 are arranged on the lateral edge of the membranous labial tip (AT); the CH1 are placed on the lateral edge of the labium; the CH2 and CH3 are placed below the apex, on the ventral side. (d) BD (no. 1–4) are spread evenly on the dorsal surface; the CH1 are placed on the lateral edge of the labium. (e) BD in magnification, PES, RBS2, and PAS on the apex (AT). (f) The CH1 are numerous and situated below the apex (ventral view), the CH2 are situated in a short row below the CH1, and the CH3 are not numerous and placed below the CH2.

Mentions: Figures 1–8 are placed in the results, and Figures 9–31 are placed in the appendix.


Comparative analysis and systematic mapping of the labial sensilla in the Nepomorpha (Heteroptera: Insecta).

Brożek J - ScientificWorldJournal (2013)

Types and sizes of the sensilla of the Diaprepocoridae and Micronectidae ((a)–(c) Diaprepocoris zealandiae, (d)–(f) Micronecta quadristrigata). (a) BD (no. 1−2.5) are spread evenly on the dorsal surface. (b) AT in magnification; PES or PAS2 are numerous and unevenly cover the tip. (c) Several of the CH1 are arranged on the lateral edge of the membranous labial tip (AT); the CH1 are placed on the lateral edge of the labium; the CH2 and CH3 are placed below the apex, on the ventral side. (d) BD (no. 1–4) are spread evenly on the dorsal surface; the CH1 are placed on the lateral edge of the labium. (e) BD in magnification, PES, RBS2, and PAS on the apex (AT). (f) The CH1 are numerous and situated below the apex (ventral view), the CH2 are situated in a short row below the CH1, and the CH3 are not numerous and placed below the CH2.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3713378&req=5

fig31: Types and sizes of the sensilla of the Diaprepocoridae and Micronectidae ((a)–(c) Diaprepocoris zealandiae, (d)–(f) Micronecta quadristrigata). (a) BD (no. 1−2.5) are spread evenly on the dorsal surface. (b) AT in magnification; PES or PAS2 are numerous and unevenly cover the tip. (c) Several of the CH1 are arranged on the lateral edge of the membranous labial tip (AT); the CH1 are placed on the lateral edge of the labium; the CH2 and CH3 are placed below the apex, on the ventral side. (d) BD (no. 1–4) are spread evenly on the dorsal surface; the CH1 are placed on the lateral edge of the labium. (e) BD in magnification, PES, RBS2, and PAS on the apex (AT). (f) The CH1 are numerous and situated below the apex (ventral view), the CH2 are situated in a short row below the CH1, and the CH3 are not numerous and placed below the CH2.
Mentions: Figures 1–8 are placed in the results, and Figures 9–31 are placed in the appendix.

Bottom Line: Twenty-one morphologically distinct types of the mechanosensilla as well as two types of the trichoid sensilla (contact-chemoreceptive sensillum) have been identified on all labial segments in representatives of subfamilies.In Nepomorpha, morphological ground plan of the labial sensory structures is represented by an apical sensory field with 10-13 pairs of papillae sensilla and the peg-in-pit ones placed more laterally; numerous trichoid sensilla are placed on the IV segment; the chaetica sensilla are present and placed in groups or rows distributed along the labium near the labial groove on the dorsal side, and also several chaetica sensilla are unevenly scattered on the surface of that segment; the cupola and peg sensilla are numerous and evenly scattered on the fourth labial segment; the prioprerecptive sensilla, one pair is positioned on the dorsal side and on the fourth segment of the labium.The new apomorphical characters have been established for the labial sensilla in the Nepomorpha.

View Article: PubMed Central - PubMed

Affiliation: Department of Zoology, Faculty of Biology and Environmental Protection, University of Silesia, Bankowa Street 9, 40-007 Katowice, Poland. jolanta.brozek@us.edu.pl

ABSTRACT
The present study provides new data concerning the morphology and distribution of the labial sensilla of 55 species of 12 nepomorphan families (Heteroptera: Nepomorpha) using the scanning electron microscope. On the labial tip, three morphologically distinct types of chemosensilla have been identified: two types of papillae sensilla and one type of peg-in-pit sensilla. Twenty-one morphologically distinct types of the mechanosensilla as well as two types of the trichoid sensilla (contact-chemoreceptive sensillum) have been identified on all labial segments in representatives of subfamilies. In Nepomorpha, morphological ground plan of the labial sensory structures is represented by an apical sensory field with 10-13 pairs of papillae sensilla and the peg-in-pit ones placed more laterally; numerous trichoid sensilla are placed on the IV segment; the chaetica sensilla are present and placed in groups or rows distributed along the labium near the labial groove on the dorsal side, and also several chaetica sensilla are unevenly scattered on the surface of that segment; the cupola and peg sensilla are numerous and evenly scattered on the fourth labial segment; the prioprerecptive sensilla, one pair is positioned on the dorsal side and on the fourth segment of the labium. The new apomorphical characters have been established for the labial sensilla in the Nepomorpha.

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