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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 Aphelocheiridae (Aphelocheirus aestivalis). (a) PES and CUS are numerous and distributed unevenly in rows on the IV segment (dorsal view). (b) TRS2 (one) is situated ventrally near the tip of the labium; PES and CUS are distributed similarly as on the dorsal side. (c) STA and CH3 are in the proximal part of the III segment (dorsal view). (d) STS, CH2, CH3, and COS are situated on the II segment (dorsal view). (e) PES are unevenly distributed on the dorsal surface of the distal part of segment III. (f) CH2 are not numerous and are situated ventrally (V) on segments I and II of the labium. (g) PAS2 (no. 1–12) are distributed over SFL.
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fig18: Types and sizes of the sensilla of the Aphelocheiridae (Aphelocheirus aestivalis). (a) PES and CUS are numerous and distributed unevenly in rows on the IV segment (dorsal view). (b) TRS2 (one) is situated ventrally near the tip of the labium; PES and CUS are distributed similarly as on the dorsal side. (c) STA and CH3 are in the proximal part of the III segment (dorsal view). (d) STS, CH2, CH3, and COS are situated on the II segment (dorsal view). (e) PES are unevenly distributed on the dorsal surface of the distal part of segment III. (f) CH2 are not numerous and are situated ventrally (V) on segments I and II of the labium. (g) PAS2 (no. 1–12) are distributed over SFL.

Mentions: Cupola-shaped sensillum (CUS) (Figure 2(a)). This sensillum is short and protrudes slightly above the surface of the labium. This type has been identified in the Belostomatidae (Belostoma flumineum, Figures 11(b) and 11(c); Hydrocyrius colombiae Figures 12(a) and 12(b); Lethocerus deyrollei, Figures 14(b) and 14(c)) and Appasus major (Table 2). It has also been observed 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)) and the Aphelocheiridae (Aphelocheirus aestivalis, Figures 18(a) and 18(b)).


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 Aphelocheiridae (Aphelocheirus aestivalis). (a) PES and CUS are numerous and distributed unevenly in rows on the IV segment (dorsal view). (b) TRS2 (one) is situated ventrally near the tip of the labium; PES and CUS are distributed similarly as on the dorsal side. (c) STA and CH3 are in the proximal part of the III segment (dorsal view). (d) STS, CH2, CH3, and COS are situated on the II segment (dorsal view). (e) PES are unevenly distributed on the dorsal surface of the distal part of segment III. (f) CH2 are not numerous and are situated ventrally (V) on segments I and II of the labium. (g) PAS2 (no. 1–12) are distributed over SFL.
© Copyright Policy - open-access
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3713378&req=5

fig18: Types and sizes of the sensilla of the Aphelocheiridae (Aphelocheirus aestivalis). (a) PES and CUS are numerous and distributed unevenly in rows on the IV segment (dorsal view). (b) TRS2 (one) is situated ventrally near the tip of the labium; PES and CUS are distributed similarly as on the dorsal side. (c) STA and CH3 are in the proximal part of the III segment (dorsal view). (d) STS, CH2, CH3, and COS are situated on the II segment (dorsal view). (e) PES are unevenly distributed on the dorsal surface of the distal part of segment III. (f) CH2 are not numerous and are situated ventrally (V) on segments I and II of the labium. (g) PAS2 (no. 1–12) are distributed over SFL.
Mentions: Cupola-shaped sensillum (CUS) (Figure 2(a)). This sensillum is short and protrudes slightly above the surface of the labium. This type has been identified in the Belostomatidae (Belostoma flumineum, Figures 11(b) and 11(c); Hydrocyrius colombiae Figures 12(a) and 12(b); Lethocerus deyrollei, Figures 14(b) and 14(c)) and Appasus major (Table 2). It has also been observed 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)) and the Aphelocheiridae (Aphelocheirus aestivalis, Figures 18(a) and 18(b)).

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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