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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 Helotrephidae (Hydrotrephes visayasinensis). (a) Several CH3, one CH2, and one CH1 are spread dorsally (D) oil the IV segment. (b) TRS1 (one) and TRS2 (one) are situated dorsally (D) near the apex. (c) Several CH3 and four CH1 are situated ventrally on the IV segment; several CH2 are situated on the III segment. (d) CH2 are placed near the labial groove and also near the distal edge of the III segment. (e) TRS1 (two) and TRS2 (two) are situated in two tufts, ventrally, near the apex of the labium. (f) Sensory field (SFR) with PAS2 (no. 1, 3–13) and PIP sensilla (no. 2). (g) COS are present on the dorsal surface of the IV segment, and several CH1 are present on the first segment.
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fig26: Types and sizes of the sensilla of the Helotrephidae (Hydrotrephes visayasinensis). (a) Several CH3, one CH2, and one CH1 are spread dorsally (D) oil the IV segment. (b) TRS1 (one) and TRS2 (one) are situated dorsally (D) near the apex. (c) Several CH3 and four CH1 are situated ventrally on the IV segment; several CH2 are situated on the III segment. (d) CH2 are placed near the labial groove and also near the distal edge of the III segment. (e) TRS1 (two) and TRS2 (two) are situated in two tufts, ventrally, near the apex of the labium. (f) Sensory field (SFR) with PAS2 (no. 1, 3–13) and PIP sensilla (no. 2). (g) COS are present on the dorsal surface of the IV segment, and several CH1 are present on the first segment.

Mentions: Large (50–100 μm) (TRS1) and short (1.0–49 μm) (TRS2) trichoid sensilla are placed on the dorsal side on the fourth segment of the labium (Figures 4(a) and 4(b)). These sensilla have been identified in the Nepidae (Figures 9(a) and 10(b)), Belostomatidae (Figures 11(a), 12, 13(b), 13(c), 14(a), and 14(b)), Pleidae (Figures 25(a) and 25(c)), Helotrephidae (Figures 26(a) and 26(b)), and Notonectidae (Figures 27(b), 27(d), and 28(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 Helotrephidae (Hydrotrephes visayasinensis). (a) Several CH3, one CH2, and one CH1 are spread dorsally (D) oil the IV segment. (b) TRS1 (one) and TRS2 (one) are situated dorsally (D) near the apex. (c) Several CH3 and four CH1 are situated ventrally on the IV segment; several CH2 are situated on the III segment. (d) CH2 are placed near the labial groove and also near the distal edge of the III segment. (e) TRS1 (two) and TRS2 (two) are situated in two tufts, ventrally, near the apex of the labium. (f) Sensory field (SFR) with PAS2 (no. 1, 3–13) and PIP sensilla (no. 2). (g) COS are present on the dorsal surface of the IV segment, and several CH1 are present on the first segment.
© Copyright Policy - open-access
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3713378&req=5

fig26: Types and sizes of the sensilla of the Helotrephidae (Hydrotrephes visayasinensis). (a) Several CH3, one CH2, and one CH1 are spread dorsally (D) oil the IV segment. (b) TRS1 (one) and TRS2 (one) are situated dorsally (D) near the apex. (c) Several CH3 and four CH1 are situated ventrally on the IV segment; several CH2 are situated on the III segment. (d) CH2 are placed near the labial groove and also near the distal edge of the III segment. (e) TRS1 (two) and TRS2 (two) are situated in two tufts, ventrally, near the apex of the labium. (f) Sensory field (SFR) with PAS2 (no. 1, 3–13) and PIP sensilla (no. 2). (g) COS are present on the dorsal surface of the IV segment, and several CH1 are present on the first segment.
Mentions: Large (50–100 μm) (TRS1) and short (1.0–49 μm) (TRS2) trichoid sensilla are placed on the dorsal side on the fourth segment of the labium (Figures 4(a) and 4(b)). These sensilla have been identified in the Nepidae (Figures 9(a) and 10(b)), Belostomatidae (Figures 11(a), 12, 13(b), 13(c), 14(a), and 14(b)), Pleidae (Figures 25(a) and 25(c)), Helotrephidae (Figures 26(a) and 26(b)), and Notonectidae (Figures 27(b), 27(d), and 28(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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