Ultrastructure of the Sensilla on the Antennae and Mouthparts of Bean Weevils, Megabruchidius dorsalis (Coleoptera: Bruchinae)
Abstract
:Simple Summary
Abstract
1. Introduction
2. Materials and Methods
2.1. Insects
2.2. Sample Preparation for Scanning Electron Microscopy (SEM)
2.3. Statistical Analyses
3. Results
3.1. Antennae
3.1.1. General Antennal Morphology
3.1.2. Types and Distributions of Antennal Sensilla
- Bőhm bristles (BB)
Antennal Segment | Length (μm) | Width (μm) | |||||
---|---|---|---|---|---|---|---|
Male | Female | Mean | Male | Female | Mean | ||
Scape | 198.1 ± 8.8 | 192.1 ± 6.5 | 195.1 ± 5.1 | 111.1 ± 2.1 | 130.8 ± 13.0 | 121.0 ± 7.3 | |
Pedicel | 155.9 ± 7.3 | 157.6 ± 4.3 | 156.7 ± 3.8 | 79.3 ± 1.6 | 89.2 ± 10.9 | 84.2 ± 5.4 | |
Flagellum | F1 | 173.1 ± 3.9 | 186.3 ± 7.5 | 179.7 ± 4.8 | 78.8 ± 1.6 | 94.7 ± 3.9 * | 86.7 ± 4.0 |
F2 | 158.7 ± 9.8 | 177.7 ± 9.0 | 168.2 ± 7.3 | 89.6 ± 4.4 | 112.3 ± 13.8 | 101.0 ± 8.2 | |
F3 | 209.0 ± 5.3 | 199.7 ± 5.3 | 204.4 ± 3.9 | 139.3 ± 3.2 | 164.7 ± 10.3 | 152.0 ± 7.4 | |
F4 | 189.3 ± 7.5 | 185.9 ± 4.0 | 187.6 ± 3.9 | 186.8 ± 3.0 | 203.1 ± 8.9 | 195.0 ± 5.6 | |
F5 | 195.5 ± 11.3 | 186.9 ± 5.0 | 191.2 ± 5.8 | 207.5 ± 6.7 | 228.4 ± 6.2 | 217.9 ± 6.2 | |
F6 | 190.7 ± 4.9 | 184.7 ± 2.6 | 187.7 ± 2.8 | 222.3 ± 7.6 | 246.6 ± 5.8 | 234.4 ± 6.9 | |
F7 | 188.3 ± 8.7 | 184.5 ± 3.3 | 186.4 ± 4.2 | 238.7 ± 4.8 | 253.8 ± 4.0 | 246.2 ± 4.4 | |
F8 | 179.2 ± 11.2 | 180.2 ± 2.0 | 179.7 ± 5.1 | 235.6 ± 4.1 | 254.0 ± 3.9 * | 244.8 ± 4.8 | |
F9 | 279.0 ± 5.2 | 291.4 ± 11.5 | 285.2 ± 6.3 | 203.7 ± 0.7 | 209.1 ± 7.3 | 206.4 ± 3.6 | |
Total | 2116.6 ± 67.4 | 2127.1 ± 57.3 | 2121.8 ± 33.7 | - | - | - |
- Sensilla trichoid (ST)
Antennal Segment | BB | ST1 | ST2 | SC1 | SC2 | SB1 | SB2 | SB3 | SB4 | SCa | SA | SG | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Base | 39.7 ± 7.6 | - | - | - | - | - | - | - | - | - | - | - | |
Scape | - | 124.3 ± 8.1 | 35.3 ± 6.4 | 10 ± 2.8 | 2.2 ± 0.3 | - | - | - | - | 3 ± 0.8 | - | - | |
Sc-Pe | 17.3 ± 4 | - | - | - | - | - | - | - | - | - | - | ||
Pedicel | - | 97.7 ± 6.9 | 36 ± 7.9 | 9.3 ± 2.3 | 2.7 ± 0.4 | - | - | - | - | 4 ± 0 | - | - | |
Flagellum | F1 | - | 115 ± 10.7 | 34.7 ± 8.7 | 12.7 ± 3 | 3 ± 0.3 | - | - | - | - | 2.7 ± 0.3 | - | - |
F2 | - | 138.3 ± 9.4 | 56.3 ± 13.9 | 16.3 ± 2.8 | 3 ± 0 | - | - | - | - | 3 ± 1 | - | - | |
F3 | - | 219.6 ± 17.2 | 93 ± 12 | 53.3 ± 3.9 | 4.5 ± 0.3 | 2 ± 1 | 5 ± 3 | 13 ± 0 | - | 5 ± 1.7 | 19 ± 5.4 | - | |
F4 | - | 260.3 ± 34.1 | 93 ± 8.8 | 88.7 ± 18.9 | 5.8 ± 0.3 | 4.8 ± 1.2 | 2.5 ± 0.9 | 12.6 ± 7.4 | - | 4.7 ± 0.6 | 30.4 ± 6.6 | - | |
F5 | - | 246 ± 37.2 | 111 ± 20 | 99 ± 8.9 | 5.5 ± 0.2 | 4 ± 0.6 | 4.3 ± 1.6 | 25.7 ± 7.3 | - | 6.7 ± 0.7 | 48 ± 9.4 | - | |
F6 | - | 216.3 ± 46.4 | 127 ± 16.5 | 151 ± 18.8 | 5.7 ± 0.7 | 7 ± 2.1 | 5.5 ± 2.4 | 68.7 ± 12.1 | - | 9.2 ± 0.7 | 58 ± 6.6 | - | |
F7 | - | 230.6 ± 45.2 | 128 ± 21 | 122 ± 11.5 | 6 ± 0.3 | 8.4 ± 1.9 | 5 ± 1.3 | 67.7 ± 12.1 | - | 10.2 ± 0.9 | 57.7 ± 10.2 | - | |
F8 | - | 238.6 ± 48.2 | 120.3 ± 20 | 140.6 ± 17.7 | 5.7 ± 0.3 | 10.5 ± 3.6 | 14.4 ± 6.4 | 76.1 ± 17.2 | - | 10.3 ± 1.3 | 60 ± 7.4 | - | |
F9 | - | 260 ± 59.3 | 130.3 ± 19.7 | 184.3 ± 20.7 | 7.7 ± 0.6 | 4.8 ± 1.4 | 13.7 ± 8.1 | 101.8 ± 21.5 | 12 ± 1.4 | 9.8 ± 0.7 | 67 ± 8.1 | 10.3 ± 0.6 |
Type of Sensilla | Subtype | Length (μm) | Number | |||||||
---|---|---|---|---|---|---|---|---|---|---|
N Sample Size | Male | Female | Mean | Median (Min–Max) | Male | Female | Mean | Median (Min–Max) | ||
Bőhm bristles | BB | 60 | 7.5 ± 0.4 | 9.2 ± 0.7 * | 8.4 ± 0.4 | 7.8cd (2.8–16.9) | 46.0 ± 9.0 | 68.0 ± 10.0 | 57.0 ± 7.8 | 56abcd (36–78) |
Sensilla trichoid | ST1 | 60 | 34.2 ± 1.4 | 35.6 ± 1.4 | 34.9 ± 0.9 | 33.8ab (22.4–57.3) | 2072.7 ± 533.5 | 2221.3 ± 198.0 | 2147.0 ± 256.6 | 2024a (1290–3092) |
ST2 | 60 | 49.1 ± 2.1 | 51.2 ± 1.8 | 50.1 ± 1.4 | 47.8a (32.5–78.4) | 1161.3 ± 210.9 | 786.7 ± 61.7 | 974.0 ± 129.2 | 848ab (664–1460) | |
Sensilla chaetica | SC1 | 60 | 27.8 ± 1.2 | 29.7 ± 1.2 | 28.7 ± 0.8 | 30.2b (14.0–42.5) | 1005.3 ± 93.4 | 769.3 ± 38.7 | 887.3 ± 69.5 | 819ab (692–1140) |
SC2 | 60 | 56.6 ± 0.9 | 54.5 ± 1.1 | 55.5 ± 0.7 | 55.9a (44.6–65.6) | 52.3 ± 4.1 | 51.0 ± 1.0 | 51.7 ± 1.9 | 50.5abcd (46–60) | |
Sensilla basiconic | SB1 | 60 | 9.8 ± 0.3 | 9.9 ± 0.3 | 9.9 ± 0.2 | 9.8c (6.7–12.6) | 23.3 ± 7.3 | 40.0 ± 8.0 | 31.7 ± 6.1 | 30.5cd (9–48) |
SB2 | 60 | 13.4 ± 0.3 | 12.2 ± 0.2 * | 12.8 ± 0.2 | 12.4c (9.6–16.4) | 60.0 ± 16.5 | 22.3 ± 6.4 | 41.1 ± 11.6 | 33.5bcd (12–90) | |
SB3 | 60 | 20.3 ± 0.3 | 18.3 ± 0.6 * | 19.3 ± 0.3 | 20.1bc (12.5–23.4) | 367.3 ± 147.3 | 338.7 ± 41.0 | 353.0 ± 68.7 | 366abc (84–579) | |
SB4 | 34 | 5.1 ± 0.3 | 6.3 ± 0.1 * | 5.7 ± 0.2 | 5.9de (2.6–7.5) | 11.3 ± 2.4 | 12.7 ± 1.8 | 12.0 ± 1.4 | 11cd (8–16) | |
Sensilla cavity | SCa | 59 | 2.1 ± 0.1 | 2.2 ± 0.1 * | 2.3 ± 0.1 | 2.1e (1.5–3.9) | 65.7 ± 12.6 | 57.0 ± 6.6 | 61.3 ± 6.6 | 60.5abcd (44–90) |
Sensilla auricillica | SA | 61 | 11.3 ± 0.2 | 10.3 ± 0.3 * | 10.8 ± 0.2 | 11.0c (1.9–13.5) | 427.3 ± 13.3 | 230.0 ± 44.1 * | 328.7 ± 48.7 | 361abc (180–450) |
Sensilla gemmiformium | SG | 20 | 1.3 ± 0.2 | 1.4 ± 0.1 | 1.3 ± 0.1 | 1.3de (0.6–2.2) | 11.3 ± 0.7 | 9.3 ± 0.7 | 10.3 ± 0.6 | 10d (8–12) |
- Sensilla chaetica (SC)
- Sensilla basiconic (SB)
- Sensilla cavity (SCa)
Type of Sensilla | Location | Count | Shape | Tip | Sensillum Surface | ||
---|---|---|---|---|---|---|---|
Male | Female | Mean | |||||
Sensilla trichoid | Maxillary palps | 38.2 ± 2.2 | 47.2 ± 0.7 * | 42.7 ± 1.8A | Curved | Blunt | Smooth |
Labial palps | 33.0 ± 4.8 | 34.5 ± 2.7 | 33.8 ± 2.6B | Curved | Blunt | Smooth | |
Sensilla chaetica | Maxillary palps | 5.8 ± 0.3 | 4.7 ± 0.4 * | 5.3 ± 0.3 | Straight | Sharp | Smooth |
Labial palps | 6.5 ± 0.4 | 4.8 ± 0.7 | 5.7 ± 0.5 | Straight | Sharp | Smooth | |
Sensilla styloconica | Maxillary palps | 20.5 ± 1.6 | 20.7 ± 1.5 | 20.6 ± 1.1A | Straight | Blunt | Top hole |
Labial palps | 7.0 ± 0.4 | 6.2 ± 0.5 | 6.6 ± 0.3B | Straight | Blunt | Top hole | |
Sensilla coeloconica | Maxillary palps | 6.0 ± 1.1 | 3.5 ± 0.3 | 4.8 ± 0.7 | Straight | Sharp | Smooth |
Labial palps | 5.3 ± 0.3 | 5.0 ± 0.6 | 5.2 ± 0.3 | Straight | Sharp | Smooth |
- Sensilla auricillica (SA)
- Sensilla gemmiformium (SG)
3.1.3. Density of Antennal Sensilla
3.2. The Maxillary and Labial Palps
Types and Distributions of the Maxillary and Labial Palp Sensilla on the Mouthpart
4. Discussion
4.1. Antennal Sensilla
4.2. Maxillary and Labial Palps Sensilla
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Chen, S.; Li, Y.; Xu, F.; Yang, M.; Wang, X.; Wu, C. Ultrastructure of the Sensilla on the Antennae and Mouthparts of Bean Weevils, Megabruchidius dorsalis (Coleoptera: Bruchinae). Insects 2021, 12, 1112. https://doi.org/10.3390/insects12121112
Chen S, Li Y, Xu F, Yang M, Wang X, Wu C. Ultrastructure of the Sensilla on the Antennae and Mouthparts of Bean Weevils, Megabruchidius dorsalis (Coleoptera: Bruchinae). Insects. 2021; 12(12):1112. https://doi.org/10.3390/insects12121112
Chicago/Turabian StyleChen, Siyu, You Li, Fangling Xu, Maofa Yang, Xiurong Wang, and Chengxu Wu. 2021. "Ultrastructure of the Sensilla on the Antennae and Mouthparts of Bean Weevils, Megabruchidius dorsalis (Coleoptera: Bruchinae)" Insects 12, no. 12: 1112. https://doi.org/10.3390/insects12121112
APA StyleChen, S., Li, Y., Xu, F., Yang, M., Wang, X., & Wu, C. (2021). Ultrastructure of the Sensilla on the Antennae and Mouthparts of Bean Weevils, Megabruchidius dorsalis (Coleoptera: Bruchinae). Insects, 12(12), 1112. https://doi.org/10.3390/insects12121112