Larval morphology of Metaphycus flavus and its role in host attachment and larval cannibalism
Metaphycus flavus (Howard) (Hymenoptera: Encyrtidae) is a facultatively gregarious endoparasitoid of soft scales (Hemiptera: Coccidae). When it develops in superparasitised hosts, the larvae often attack and consume brood mates six or more days post oviposition. Under our laboratory conditions (25 +...
| Main Authors: | , , , , |
|---|---|
| Format: | article |
| Language: | Inglés |
| Published: |
2017
|
| Online Access: | http://hdl.handle.net/20.500.11939/4563 |
| _version_ | 1855032141678641152 |
|---|---|
| author | Tena, Alejandro Kapranas, Apostolos Walker, G. P. García-Marí, Ferran Luck, Robert F. |
| author_browse | García-Marí, Ferran Kapranas, Apostolos Luck, Robert F. Tena, Alejandro Walker, G. P. |
| author_facet | Tena, Alejandro Kapranas, Apostolos Walker, G. P. García-Marí, Ferran Luck, Robert F. |
| author_sort | Tena, Alejandro |
| collection | ReDivia |
| description | Metaphycus flavus (Howard) (Hymenoptera: Encyrtidae) is a facultatively gregarious endoparasitoid of soft scales (Hemiptera: Coccidae). When it develops in superparasitised hosts, the larvae often attack and consume brood mates six or more days post oviposition. Under our laboratory conditions (25 +/- 1 degrees C and 14 hours of light followed by 18 +/- 1 degrees C and ten hours of darkness in 50-70% R. H.), M. flavus eggs hatched three days after oviposition. Measurements of the mandibles and tentorium indicate there are four larval instars, and M. flavus reaches the fourth instar by day six post oviposition, and pupates on day eight. Thus, cannibalism among M. flavus larvae occurs during the fourth instar. During this instar, M. flavus larvae separate from their attachment to the scale cuticle, to which they were tethered by a respiratory structure during the previous three larval instars. Once detached, they are free to move within the scale, which increases the probability of larval encounters and aggressive behaviours. Moreover, the mandibles of the fourth instar are better adapted for fighting than are those of the first three larval instars, since they are larger and more sclerotized. The cranium and mouthparts of M. flavus have four different types of sensory organs, some of which are almost certainly olfactory, an unexpected function for a larva that presumably is surrounded by an aqueous medium where gustatory sensilla would seem to be more appropriate. The cranium also bears two pairs of what appear to be secretory pores. |
| format | article |
| id | ReDivia4563 |
| institution | Instituto Valenciano de Investigaciones Agrarias (IVIA) |
| language | Inglés |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| record_format | dspace |
| spelling | ReDivia45632025-04-25T14:43:51Z Larval morphology of Metaphycus flavus and its role in host attachment and larval cannibalism Tena, Alejandro Kapranas, Apostolos Walker, G. P. García-Marí, Ferran Luck, Robert F. Metaphycus flavus (Howard) (Hymenoptera: Encyrtidae) is a facultatively gregarious endoparasitoid of soft scales (Hemiptera: Coccidae). When it develops in superparasitised hosts, the larvae often attack and consume brood mates six or more days post oviposition. Under our laboratory conditions (25 +/- 1 degrees C and 14 hours of light followed by 18 +/- 1 degrees C and ten hours of darkness in 50-70% R. H.), M. flavus eggs hatched three days after oviposition. Measurements of the mandibles and tentorium indicate there are four larval instars, and M. flavus reaches the fourth instar by day six post oviposition, and pupates on day eight. Thus, cannibalism among M. flavus larvae occurs during the fourth instar. During this instar, M. flavus larvae separate from their attachment to the scale cuticle, to which they were tethered by a respiratory structure during the previous three larval instars. Once detached, they are free to move within the scale, which increases the probability of larval encounters and aggressive behaviours. Moreover, the mandibles of the fourth instar are better adapted for fighting than are those of the first three larval instars, since they are larger and more sclerotized. The cranium and mouthparts of M. flavus have four different types of sensory organs, some of which are almost certainly olfactory, an unexpected function for a larva that presumably is surrounded by an aqueous medium where gustatory sensilla would seem to be more appropriate. The cranium also bears two pairs of what appear to be secretory pores. 2017-06-01T10:10:25Z 2017-06-01T10:10:25Z 2011 JUN 2011 article Tena, A., Kapranas, A., Walker, G. P., Garcia-Mari, F., Luck, R. F. (2011). Larval morphology of Metaphycus flavus and its role in host attachment and larval cannibalism. Bulletin of entomological research, 101(3), 365-372. 0007-4853 http://hdl.handle.net/20.500.11939/4563 10.1017/S0007485310000611 en openAccess Impreso |
| spellingShingle | Tena, Alejandro Kapranas, Apostolos Walker, G. P. García-Marí, Ferran Luck, Robert F. Larval morphology of Metaphycus flavus and its role in host attachment and larval cannibalism |
| title | Larval morphology of Metaphycus flavus and its role in host attachment and larval cannibalism |
| title_full | Larval morphology of Metaphycus flavus and its role in host attachment and larval cannibalism |
| title_fullStr | Larval morphology of Metaphycus flavus and its role in host attachment and larval cannibalism |
| title_full_unstemmed | Larval morphology of Metaphycus flavus and its role in host attachment and larval cannibalism |
| title_short | Larval morphology of Metaphycus flavus and its role in host attachment and larval cannibalism |
| title_sort | larval morphology of metaphycus flavus and its role in host attachment and larval cannibalism |
| url | http://hdl.handle.net/20.500.11939/4563 |
| work_keys_str_mv | AT tenaalejandro larvalmorphologyofmetaphycusflavusanditsroleinhostattachmentandlarvalcannibalism AT kapranasapostolos larvalmorphologyofmetaphycusflavusanditsroleinhostattachmentandlarvalcannibalism AT walkergp larvalmorphologyofmetaphycusflavusanditsroleinhostattachmentandlarvalcannibalism AT garciamariferran larvalmorphologyofmetaphycusflavusanditsroleinhostattachmentandlarvalcannibalism AT luckrobertf larvalmorphologyofmetaphycusflavusanditsroleinhostattachmentandlarvalcannibalism |