Morphology and Development of the Peripheral Olfactory Organs

Keil, Thomas A.

doi:10.1007/978-3-662-07911-9_2

Cited by 188 publications

(213 citation statements)

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“…sensilla basiconica and trichodea) and double-walled sensilla (including sensilla coeloconica and grooved pegs) (Hallberg andHansson 1999, Keil 1999). The number of bipolar sensory neurons, in this case olfactory receptor neurons (ORNs) innervating a particular sensillum type varies from one to approximately fifty (Keil 1999). Surrounding these neurons are often three, but sometimes four, enveloping support cells (the tormogen, trichogen and thecogen cells), each of which have a particular role in the development of the sensillum and take an active part in the mature sensillum (reviewed by Keil 1999).…”

Section: Morphology Of the Peripheral Olfactory Systemmentioning

confidence: 99%

Olfaction in vector-host interactions

Takken¹,

Knols²

2010

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Section: Morphology Of the Peripheral Olfactory Systemmentioning

confidence: 99%

Olfaction in vector-host interactions

Takken¹,

Knols²

2010

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“…4b), which had the form of a papiliform peg sunk within a depression ( fig. 4b, f) and that resembled basiconic or styloconic sensilla (Keil, 1999). We also found three pairs of sensilla, one pair occurred laterally on the clypeo-labrum and two pairs occurred on the maxillary-labial complex ( fig.…”

Section: Resultsmentioning

confidence: 56%

“…They have coeloconic sensilla ( fig. 4e), which are chemosensory and usually olfactory in function (Keil, 1999).…”

Section: The Fourth Instar As a Fighting Instarmentioning

confidence: 99%

“…4c) are almost certainly olfactory, as the presence of the many pores is characteristic of insect olfactory sense organs (Keil, 1999). However, the occurrence of olfactory organs in the third and fourth instars is surprising since they live within a host, presumably in an aqueous environment.…”

Section: The Fourth Instar As a Fighting Instarmentioning

confidence: 99%

“…The peg sensilla on the clypeo-labrum ( fig. 4f) bear similarities to both basiconic and styloconic sensilla; the former are usually chemosensory while the latter often function as temperature and/or humidity sensors (Keil, 1999). However, the senses provided by the peg sensilla is unknown.…”

Section: The Fourth Instar As a Fighting Instarmentioning

confidence: 99%

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Larval morphology ofMetaphycus flavusand its role in host attachment and larval cannibalism

Tena

Kapranas

Walker

et al. 2011

Bull. Entomol. Res.

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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°C and 14 hours of light followed by 18 ± 1°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.

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