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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 Naucoridae: Cryphocricinae (Ambrysus occidentalis). (a) MPS are less numerous and spread evenly over the III segment (dorsal view); several CH3 are present on the II segment (dorsal view). (b) CH2 and CH1 cover the dorsal and ventral surfaces of the I segment; COS are situated ventrally on the II segment. (c) TRS1 (four) and TRS2 (one) are situated on the dorsal side (D), in one tuft located distally on the III segment. (d) TRS1 (five) and TRS2 (one) are distributed over the ventral side (V) in one row near the apex of the labium. (e) MPS are less numerous and distributed evenly over the IV segment (dorsal view); PAS2 are distributed on the labial tip (SFR, SFL). (f) One pair of CH3 is situated ventrally near the distal edge of the III and II segments, CH1 are situated oil the edge of the I segment on the ventral side, and COS are located on the II segment on the ventral.
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fig23: Types and sizes of the sensilla of the Naucoridae: Cryphocricinae (Ambrysus occidentalis). (a) MPS are less numerous and spread evenly over the III segment (dorsal view); several CH3 are present on the II segment (dorsal view). (b) CH2 and CH1 cover the dorsal and ventral surfaces of the I segment; COS are situated ventrally on the II segment. (c) TRS1 (four) and TRS2 (one) are situated on the dorsal side (D), in one tuft located distally on the III segment. (d) TRS1 (five) and TRS2 (one) are distributed over the ventral side (V) in one row near the apex of the labium. (e) MPS are less numerous and distributed evenly over the IV segment (dorsal view); PAS2 are distributed on the labial tip (SFR, SFL). (f) One pair of CH3 is situated ventrally near the distal edge of the III and II segments, CH1 are situated oil the edge of the I segment on the ventral side, and COS are located on the II segment on the ventral.

Mentions: Multilobed sensillum (MPS) (Figure 2(f)). This type of sensillum consists of a few narrow lobes, arising from a common stem. The base of the sensillum is sunken in a socket and the lobes evidently protrude above the cuticular surface. This type of sensillum has been found in the Limnocorinae (Limnocoris lutzi, Figures 21(a) and 21(c)), Cryphocricinae (Cryphocricos hungerfordi, Figures 22(a), 22(b), 22(c), and 22(d); Ambrysus occidentalis, Figures 23(a), 23(c) and 23(e)) and the Naucorinae (Naucoris maculatus, Figure 24(a); Namtokocoris siamensis,Figure 24(d); Neomacrocoris handlirschi,Figure 24(g)) as well as in Ilyocoris cimicoides and Pelocoris femoratus, (Table 2).


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 Naucoridae: Cryphocricinae (Ambrysus occidentalis). (a) MPS are less numerous and spread evenly over the III segment (dorsal view); several CH3 are present on the II segment (dorsal view). (b) CH2 and CH1 cover the dorsal and ventral surfaces of the I segment; COS are situated ventrally on the II segment. (c) TRS1 (four) and TRS2 (one) are situated on the dorsal side (D), in one tuft located distally on the III segment. (d) TRS1 (five) and TRS2 (one) are distributed over the ventral side (V) in one row near the apex of the labium. (e) MPS are less numerous and distributed evenly over the IV segment (dorsal view); PAS2 are distributed on the labial tip (SFR, SFL). (f) One pair of CH3 is situated ventrally near the distal edge of the III and II segments, CH1 are situated oil the edge of the I segment on the ventral side, and COS are located on the II segment on the ventral.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig23: Types and sizes of the sensilla of the Naucoridae: Cryphocricinae (Ambrysus occidentalis). (a) MPS are less numerous and spread evenly over the III segment (dorsal view); several CH3 are present on the II segment (dorsal view). (b) CH2 and CH1 cover the dorsal and ventral surfaces of the I segment; COS are situated ventrally on the II segment. (c) TRS1 (four) and TRS2 (one) are situated on the dorsal side (D), in one tuft located distally on the III segment. (d) TRS1 (five) and TRS2 (one) are distributed over the ventral side (V) in one row near the apex of the labium. (e) MPS are less numerous and distributed evenly over the IV segment (dorsal view); PAS2 are distributed on the labial tip (SFR, SFL). (f) One pair of CH3 is situated ventrally near the distal edge of the III and II segments, CH1 are situated oil the edge of the I segment on the ventral side, and COS are located on the II segment on the ventral.
Mentions: Multilobed sensillum (MPS) (Figure 2(f)). This type of sensillum consists of a few narrow lobes, arising from a common stem. The base of the sensillum is sunken in a socket and the lobes evidently protrude above the cuticular surface. This type of sensillum has been found in the Limnocorinae (Limnocoris lutzi, Figures 21(a) and 21(c)), Cryphocricinae (Cryphocricos hungerfordi, Figures 22(a), 22(b), 22(c), and 22(d); Ambrysus occidentalis, Figures 23(a), 23(c) and 23(e)) and the Naucorinae (Naucoris maculatus, Figure 24(a); Namtokocoris siamensis,Figure 24(d); Neomacrocoris handlirschi,Figure 24(g)) as well as in Ilyocoris cimicoides and Pelocoris femoratus, (Table 2).

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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