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South American Nothochrysinae (Neuroptera, Chrysopidae): II. Redescription of Leptochrysaprisca Adams & Penny.

ABSTRACT: Leptochrysa Adams & Penny is one of four genera of Nothochrysinae recorded from the New World. Previously, this genus and its only described species, Leptochrysaprisca Adams & Penny, were known from a single female specimen that is discolored and damaged by fungal infestation. Thus, accurate information on the taxon was limited mostly to the wings and some other external features. Here, I describe a recently collected, second female specimen with the goal of providing images of the adult coloration and elucidating characters (especially the female genitalia) that were unavailable earlier. Some variation between the two known specimens is also noted and used in interpreting venation characters. Finally, comparisons are made with other extant genera pertaining to the placement of the species within Chrysopidae.

SUBMITTER: Tauber CA

PROVIDER: S-EPMC6669214 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature

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South American Nothochrysinae (Neuroptera, Chrysopidae): II. Redescription of Leptochrysaprisca Adams & Penny.

Tauber Catherine A CA

ZooKeys 20190724

Leptochrysa Adams & Penny is one of four genera of Nothochrysinae recorded from the New World. Previously, this genus and its only described species, Leptochrysaprisca Adams & Penny, were known from a single female specimen that is discolored and damaged by fungal infestation. Thus, accurate information on the taxon was limited mostly to the wings and some other external features. Here, I describe a recently collected, second female specimen with the goal of providing images of the ...[more]

PMID: 31388321

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Project description:Green lacewings (Neuroptera: Chrysopidae) are voracious predators of aphids and other small, soft-bodied insects and mites. Earlier, we identified (1R,2S,5R,8R)-iridodial from wild males of the goldeneyed lacewing, Chrysopa oculata Say, which is released from thousands of microscopic dermal glands on the abdominal sterna. Iridodial-baited traps attract C. oculata and other Chrysopa spp. males into traps, while females come to the vicinity of, but do not usually enter traps. Despite their healthy appearance and normal fertility, laboratory-reared C. oculata males do not produce iridodial. Surprisingly, goldeneyed lacewing males caught alive in iridodial-baited traps attempt to eat the lure and, in Asia, males of other Chrysopa species reportedly eat the native plant, Actinidia polygama (Siebold & Zucc.) Maxim. (Actinidiaceae) to obtain the monoterpenoid, neomatatabiol. These observations suggest that Chrysopa males must sequester exogenous natural iridoids in order to produce iridodial; we investigated this phenomenon in laboratory feeding studies. Lacewing adult males fed various monoterpenes reduced carbonyls to alcohols and saturated double bonds, but did not convert these compounds to iridodial. Only males fed the common aphid sex pheromone component, (1R,4aS,7S,7aR)-nepetalactol, produced (1R,2S,5R,8R)-iridodial. Furthermore, although C. oculata males fed the second common aphid sex pheromone component, (4aS,7S,7aR)-nepetalactone, did not produce iridodial, they did convert ∼75% of this compound to the corresponding dihydronepetalactone, and wild C. oculata males collected in early spring contained traces of this dihydronepetalactone. These findings are consistent with the hypothesis that Chrysopa males feed on oviparae (the late-season pheromone producing stage of aphids) to obtain nepetalactol as a precursor to iridodial. In the spring, however, wild C. oculata males produce less iridodial than do males collected later in the season. Therefore, we further hypothesize that Asian Chrysopa eat A. polygama to obtain iridoid precursors in order to make their pheromone, and that other iridoid-producing plants elsewhere in the world must be similarly usurped by male Chrysopa species to sequester pheromone precursors.

Project description:Mallada basalis (Walker) has the potential to be a valuable biological control agent because of its predatory abilities, strong reproductive capacity, and broad prey range. This study aimed to improve on a previously used artificial diet for M. basalis, to achieve a longer oviposition period and greater survival rate and fecundity. We analyzed the development, survival, longevity, and reproduction of M. basalis (F1 and F2 generations) fed two artificial diets (AD1 and AD2). Both diets contained chicken egg yolk, beer yeast powder, honey, trehalose, seawater spirulina, and potassium sorbate. AD1 also contained sucrose and vitamin C. The duration of F1 1st larvae, F1 2nd larvae, F1 pupae, F2 egg, and F2 2nd larvae reared on AD1 were significantly shorter than those reared on AD2. F1 adult longevity and F2 oviposition period for AD1 (45.40 d and 31.00 d) were significantly longer than for AD2 (30.74 d and 20.80 d). All the following were significantly greater for AD1 compared with AD2: F1 female proportion, F1 daily oviposition, F1 female oviposition, F2 daily oviposition, F2 female oviposition, F1 emergence rate, F2 pupation rate, and F3 egg hatching rate. Moreover, for M. basalis fed AD2, the duration of F2 2nd and 3rd larvae (9.00 d and 8.64 d) were significantly longer than for F1 (4.70 d and 4.92 d). The F1 oviposition period (31.57 d) was significantly longer than F2 (20.80 d). The F2 female oviposition (189.20 egg/female) was significantly less than F1 (307.14 egg/female). We found that the oviposition period and female longevity of F1 reared on AD1 was longer than that reared on the artificial diet in a previous study. The daily oviposition and female oviposition of F1 from AD1 was larger, while the F2 egg hatching rate was greater compared with that from the previous diet. However, the offspring of M. basalis fed AD2 were less thrifty. We found diet AD1 supported development and reproduction better than AD2 and the diets in our previous study. These findings may contribute to the mass rearing of this economically important predatory green lacewing.

Dataset Information

South American Nothochrysinae (Neuroptera, Chrysopidae): II. Redescription of Leptochrysaprisca Adams & Penny.

Publications

South American Nothochrysinae (Neuroptera, Chrysopidae): II. Redescription of <i>Leptochrysaprisca</i> Adams & Penny.

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