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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, sizes, and distribution of the sensilla of the Belostomatinae (Limnogeton fieberi). (a) PES are specifically situated only in the small area near the apex. (b) TRS2 (three), TRS1 (five) form a single row and are placed dorsally (D) near the apex of the labium. (c) TRS2 (two), TRS1 (six) form a single row and are placed ventrally (V) near the apex of the labium. (d) CH1, CH2, and CH3 densely cover the dorsal surface of the labium on segments II and III. (e) CH3 are numerous and is cover all surface of the ventral side of segment II, one pair of CH2 and at the base of the second segment, CH3 are densely distributed over segment I (ventrally). (f) Total view on the labial segments showing type (A) distribution of the labial sensilla.
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fig13: Types, sizes, and distribution of the sensilla of the Belostomatinae (Limnogeton fieberi). (a) PES are specifically situated only in the small area near the apex. (b) TRS2 (three), TRS1 (five) form a single row and are placed dorsally (D) near the apex of the labium. (c) TRS2 (two), TRS1 (six) form a single row and are placed ventrally (V) near the apex of the labium. (d) CH1, CH2, and CH3 densely cover the dorsal surface of the labium on segments II and III. (e) CH3 are numerous and is cover all surface of the ventral side of segment II, one pair of CH2 and at the base of the second segment, CH3 are densely distributed over segment I (ventrally). (f) Total view on the labial segments showing type (A) distribution of the labial sensilla.

Mentions: Peg sensillum (PES) (Figure 2(a)). It is a short cone sunken in a shallow cavity of cuticle and equipped with a flexible socket (SOC). This type of sensillum has been found in the Belostomatidae (Belostoma flumineumFigure 11(c); Hydrocyrius colombiae, Figures 12(a) and 12(b); Limnogeton fieberi,Figure 13(a); Lethocerus deyrollei, Figures 14(b) and 14(c)) and Appasus major (Table 2) as well as in the Ochteridae (Ochterus piliferus, Figures 15(b) and 15(c); O. marginatus,Figure 15(f)); Gelastocoridae (Gelastocoris oculatus Figures 16(a) and 16(b), Nerthra nepaeformis, Figures 17(a), 17(b), 17(c) and 17(d)), Aphelocheiridae (Aphelocheirus aestivalis, Figures 18(a) and 18(b)) and in some Naucoridae; in the Cheirochelinae (Cheirochela feana, Figures 19(a) and 19(b)), (Gestroiella limnocoroides, Figure 19(f)), and Coptocatus kinabalu, Coptocatus oblongulus, Tanycricos longiceps (Table 2), Laccocorinae (Laccocoris hoogstraali, Figures 20(a) and 20(b); Helocoris humeralis, Figures 20(e) and 20(f)), Corixidae, (Corixa dentipes,Figure 29(d), Cymatia coleoptrata, Figures 30(b), 30(e), and 30(f)), and Hesperocorixa linnaei, Ectemnostegella montana, Agraptocorixa hyalinipennis, Corixa punctata, Stenocorixa protrusa,Table 2), Diaprepocoridae, (Diaprepocoris zealandiae, Figures 31(a) and 31(b)) and finally in the Micronectidae (Micronecta quadristrigata,Figure 31(e)).


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

Brożek J - ScientificWorldJournal (2013)

Types, sizes, and distribution of the sensilla of the Belostomatinae (Limnogeton fieberi). (a) PES are specifically situated only in the small area near the apex. (b) TRS2 (three), TRS1 (five) form a single row and are placed dorsally (D) near the apex of the labium. (c) TRS2 (two), TRS1 (six) form a single row and are placed ventrally (V) near the apex of the labium. (d) CH1, CH2, and CH3 densely cover the dorsal surface of the labium on segments II and III. (e) CH3 are numerous and is cover all surface of the ventral side of segment II, one pair of CH2 and at the base of the second segment, CH3 are densely distributed over segment I (ventrally). (f) Total view on the labial segments showing type (A) distribution of the labial sensilla.
© Copyright Policy - open-access
Related In: Results  -  Collection

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fig13: Types, sizes, and distribution of the sensilla of the Belostomatinae (Limnogeton fieberi). (a) PES are specifically situated only in the small area near the apex. (b) TRS2 (three), TRS1 (five) form a single row and are placed dorsally (D) near the apex of the labium. (c) TRS2 (two), TRS1 (six) form a single row and are placed ventrally (V) near the apex of the labium. (d) CH1, CH2, and CH3 densely cover the dorsal surface of the labium on segments II and III. (e) CH3 are numerous and is cover all surface of the ventral side of segment II, one pair of CH2 and at the base of the second segment, CH3 are densely distributed over segment I (ventrally). (f) Total view on the labial segments showing type (A) distribution of the labial sensilla.
Mentions: Peg sensillum (PES) (Figure 2(a)). It is a short cone sunken in a shallow cavity of cuticle and equipped with a flexible socket (SOC). This type of sensillum has been found in the Belostomatidae (Belostoma flumineumFigure 11(c); Hydrocyrius colombiae, Figures 12(a) and 12(b); Limnogeton fieberi,Figure 13(a); Lethocerus deyrollei, Figures 14(b) and 14(c)) and Appasus major (Table 2) as well as in the Ochteridae (Ochterus piliferus, Figures 15(b) and 15(c); O. marginatus,Figure 15(f)); Gelastocoridae (Gelastocoris oculatus Figures 16(a) and 16(b), Nerthra nepaeformis, Figures 17(a), 17(b), 17(c) and 17(d)), Aphelocheiridae (Aphelocheirus aestivalis, Figures 18(a) and 18(b)) and in some Naucoridae; in the Cheirochelinae (Cheirochela feana, Figures 19(a) and 19(b)), (Gestroiella limnocoroides, Figure 19(f)), and Coptocatus kinabalu, Coptocatus oblongulus, Tanycricos longiceps (Table 2), Laccocorinae (Laccocoris hoogstraali, Figures 20(a) and 20(b); Helocoris humeralis, Figures 20(e) and 20(f)), Corixidae, (Corixa dentipes,Figure 29(d), Cymatia coleoptrata, Figures 30(b), 30(e), and 30(f)), and Hesperocorixa linnaei, Ectemnostegella montana, Agraptocorixa hyalinipennis, Corixa punctata, Stenocorixa protrusa,Table 2), Diaprepocoridae, (Diaprepocoris zealandiae, Figures 31(a) and 31(b)) and finally in the Micronectidae (Micronecta quadristrigata,Figure 31(e)).

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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