Myelois circumvoluta, Fourcroy

Özyolci, Büşra & Çalişkan, Selma Seven, 2024, Morphological comparison of tympanal organs between Phycitinae and Pyralinae (Lepidoptera: Pyralidae), Zootaxa 5463 (1), pp. 127-136 : 132

Myelois circumvoluta (Geoffroy in Fourcroy, 1785)

Image ( Fig. 2i ): The wingspan of the adults is 26mm. The forewings are broken white in color and have scattered black dot-like spots on it. The smaller ones of these spots are lined in a row at the base of wing fringes. The rear wings are white-greyish, and there are brown dots on the fringe edges.

Tympanal organ ( Figs. 3i , 4i ): Bulla tympani is closed and concave. Tympanum and conjunktivum are on the same plane. Tympanum has an oval shape and the spinula structure is prominent. There is a thorny rugae odontinae structure between the tympanum and fornix tympani. Tympanum is D-shaped while the conjunktivum has an oval shape. Fornix tympani is thin. The pons tympani is shaped like two needles. The processus spiniforme is shaped like a curved triangle. The tergo-sternal sclerite is long and curved. The zona glabra tympani is wide. The processus spiniforme is roof-shaped and curved.

Figures

FIGURE 2. Top views of pyralid images. a. Pyralis farinalis b. Hypsopygia glaucinalis c. Endotrichia flammealis d. Dioryctria pineae e. D. mendacella f. Oncocera semirubella g. Etiella zinckenella h. Acrobasis obliqua i. Myelois circumvoluta j. Ematheudes punctellus.

FIGURE 3. Ventral view of the tympanal organs of moths before preparation (con: conjunctivum, ft: fornix tympany, prs: processus spiniforme, rgo: rugae odontinae, spn: spinula, tym: tympanum, tymc.: tympanalcilia, zgt: zona glabra tympani) a. Pyralis farinalis b. Hypsopygia glaucinalis c. Endotricha flammealis d. Dioryctria pineae e. Dioryctria mendacella f. Oncocera semirubella g. Etiella zinckenella h. Acrobasis obliqua i. Myelois circumvoluta j. Ematheudes punctellus.

FIGURE 4. Tympanal organs ultrastrukture of the moths after preparation (Blue circle: Intersegmental thoraco abdominal membrane; black circle: pons tympani; black triangle: processus spiniforme; red line: fornix tympani width) a. Pyralis farinalis b. Hypsopygia glaucinalis c. Endotricha flammealis d. Dioryctria pineae e. Dioryctria mendacella f. Oncocera semirubella g. Etiella zinckenella h. Acrobasis obliqua i. Myelois circumvoluta j. Ematheudes punctellus.