The composition of the defensive secretions of Thaumastella namaquensis and T. elizabethae with notes on the higher classification of the thaumastellidae (insecta: heteroptera)

Jacobs, D. H.; Apps, P.J.; Viljoen, Hermien

doi:10.1016/0305-0491(89)90107-7

Cited by 6 publications

(7 citation statements)

References 19 publications

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“…The results of the present comparative analyses of the predicted 18S rRNA secondary and tertiary structures-in addition to the morphological [22][23][24][25]33], biochemical [32] and phylogenetic evidence to date [7,20,35,36,40]-support the hypothesis that the Thaumastellidae are phylogenetically distinct from the Cydnidae and should not be placed within the latter as a subfamily.…”

Section: Systematic Position Of Thaumastellidae Within Pentatomoideasupporting

confidence: 67%

“…He also suggested the Thaumastellidae to be an early offshoot of the main pentatomoid stock and the sister taxon to all remaining Pentatomoidea [23]. Since then, the systematic position of Thaumastella as a part of the superfamily Pentatomoidea has never been challenged, and the genus has usually been considered very primitive (sometimes even the most primitive) within the entire superfamily [7,[23][24][25][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

“…Most importantly, the interpretation of its systematic position has varied significantly depending on the author and the type of analysis. Three competing hypotheses thus exist: Thaumastella as (1) a taxon of the family rank, being sister to all other Pentatomoidea [7,20,[32][33][34][35][36]; (2) closely related to the Cydnidae [24,31,[37][38][39][40][41][42][43][44][45]; or (3) a subfamily in the broadly conceived Cydnidae ('cydnoid complex' sensu Lis et al, 2017; Cydnidae sensu Schuh and Weirauch, 2020) [25,27,[46][47][48][49].…”

Section: Introductionmentioning

confidence: 99%

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Molecular Apomorphies in the Secondary and Tertiary Structures of Length-Variable Regions (LVRs) of 18S rRNA Shed Light on the Systematic Position of the Family Thaumastellidae (Hemiptera: Heteroptera: Pentatomoidea)

Lis

2023

IJMS

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The SSU nrDNA, a small subunit of the nuclear ribosomal DNA (coding 18S rRNA), is one of the most frequently sequenced genes in molecular studies in Hexapoda. In insects, including true bugs (Hemiptera: Heteroptera), only its primary structures (i.e., aligned sequences) are predominantly used in phylogenetic reconstructions. It is known that including RNA secondary structures in the alignment procedure is essential for improving accuracy and robustness in phylogenetic tree reconstruction. Moreover, local plasticity in rRNAs might impact their tertiary structures and corresponding functions. To determine the systematic position of Thaumastellidae within the superfamily Pentatomoidea, the secondary and—for the first time among all Hexapoda—tertiary structures of 18S rRNAs in twelve pentatomoid families were compared and analysed. Results indicate that the shapes of the secondary and tertiary structures of the length-variable regions (LVRs) in the 18S rRNA are phylogenetically highly informative. Based on these results, it is suggested that the Thaumastellidae is maintained as an independent family within the superfamily Pentatomoidea, rather than as a part of the family Cydnidae. Moreover, the analyses indicate a close relationship between Sehirinae and Parastrachiidae, expressed in morpho-molecular synapomorphies in the predicted secondary and tertiary structures of the length-variable region L (LVR L).

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Section: Systematic Position Of Thaumastellidae Within Pentatomoideasupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Molecular Apomorphies in the Secondary and Tertiary Structures of Length-Variable Regions (LVRs) of 18S rRNA Shed Light on the Systematic Position of the Family Thaumastellidae (Hemiptera: Heteroptera: Pentatomoidea)

Lis

2023

IJMS

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“…The sharp increase in (E)-2-decenal content at the bud formation and blooming stages may at least partly explain why cilantro is typically harvested prior to this stage of development. (E)-2-Decenal is a potent irritant (Sax and Lewis, 1989) and is found in the defensive secretion of insects (Jacobs et al, 1989). From this, it may be inferred that it may be objectionable to humans.…”

Section: Resultsmentioning

confidence: 99%

Essential Oil Composition of Cilantro

Potter

1996

J. Agric. Food Chem.

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Leaf oil was isolated from two commercial samples of cilantro (Coriandrum sativum L.) and from growth-chamber-grown plants at five different stages of growth. The oils were analyzed by GC/MS. They were found to be composed mainly of C10−C16 aldehydes. (E)-2-Alkenals predominated. Substantial quantitative differences were observed between the two cilantro samples and in the leaf oils isolated at different growth stages. The data indicate that cilantro oil may exhibit significant variation in composition due to ontogenic factors. The data also suggest a possible link among growth stage, oil composition, and consumer preference. Keywords: Cilantro; Coriandrum sativuum; essential oil; ontogeny

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“…Among the coriander leaf volatiles with reported insect repellent activity are 2-nonenal (Ryan and Guerin, 1989; Me loan, 1982). Insect repellent activity for 2-decenal can also be inferred since it is one of the major components of the defensive secretions of two Thaumestella spp (Jacobs et al, 1989).…”

Section: Resultsmentioning

confidence: 99%