Ultrastructure and development of the new stylets inside pre-molting first instar nymphs of the Asian citrus psyllid Diaphorina citri (Hemiptera: Liviidae)
Keywords:
bacteriome, citrus greening disease, filter chamber, huanglongbing, mandibular stylets, maxillary styletsAbstract
The ultrastructure and development of new stylets was studied in pre-molting first instar nymph of Diaphorina citri Kuwayama (Hemiptera: Liviidae). Two oval-shaped masses of cuboidal hypodermal cells, located in the cephalic region, had long extensions that ended with developing pairs of mandibular and maxillary stylets, apparently coiled around these masses. A new structure, probably composed of softer cuticle, was found on the ventral side of each developing stylet suggesting that this structure may work as a mold during formation of the new stylets. Other organs of 1st instar nymphs, including the filter chamber and bacteriome, are also ultrastructurally described.
Sumario
Se estudiaron la ultraestructura y el desarrollo de los nuevos estiletes en la pre-muda del primer instar de la ninfa de Diaphorina citri Kuwayama (Hemiptera: Liviidae). Dos masas de células cúbicas hipodermales de forma ovalada, ubicadas en la región cefálica, tenían extensiones largas que termine en el desarrollo de pares de estiletes mandibulares y maxilares, al parecer, enrollados alrededor de estas masas. Una nueva estructura, probablemente compuesta de cutícula más suave, se encuentro en el lado ventral de cada estilete en desarrollo lo que sugiere que esta estructura puede funcionar como un molde durante la formación de los nuevos estiletes. Otros órganos de las ninfas del primer estadio, incluyendo la cámara de filtración y bacteriome, también se describen ultraestructuralmente.
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