Friday, December 29, 2017

[Entomology • 2017] Thyridosmylus fuscomarginatus & T. longiprocessus • Two New Species of Thyridosmylus Krüger, 1913 (Neuroptera, Osmylidae) from Madagascar

Thyridosmylus longiprocessus Xu, Wang & Winterton, 2017

in Xu, Winterton, Wang, Liu, 2017. 

The lance lacewing genus Thyridosmylus Krüger (Osmylidae: Spilosmylinae) is found in Madagascar and Southeast Asia. Two new Malagasy species are described herein, Thyridosmylus fuscomarginatus Xu, Wang & Winterton, sp. n., and Thyridosmylus longiprocessus Xu, Wang & Winterton, sp. n. A key to differentiate the Malagasy species of Thyridosmylus is provided.

Keywords: lacewing, Malagasy species, Osmylidae

Figure 1. Wings of Thyridosmylus fuscomarginatus Xu, Wang & Winterton, sp. n.
Abbreviations: ng, nygmata; pt, pterostigma; og, outer gradates. Scale bar: 0.5 mm. 

Thyridosmylus fuscomarginatus Xu, Wang & Winterton, sp. n.

Diagnosis: Pronotum light yellow with three longitudinal dark brown stripes; posterior margin of forewing with brown markings, branches of vein A1 marked with a dark brown spot, area around outer gradate cross-veins fenestrate with pale venation; sternite 8 in female reduced, extending anteriorly to form a forward process in lateral view; spermatheca complex with 11–12 sacs, basal sac large.

Etymology: The specific name “fuscomarginatus”, a compound from Latin fusco- (fuscus) and marginatus- (margin), in reference to the colour and pattern of markings on the outer and posterior margin of forewings.

Distribution: Madagascar (Antsiranana, Mahajanga)

Remarks: The forewings markings of Thyridosmylus fuscomarginatus sp. n. are characteristic, clearly differed from other Thyridosmylus species by the dark posteromarginal stripe.

Figure 3. Wings of Thyridosmylus longiprocessus Xu, Wang & Winterton, sp. n. Scale bar: 0.5 mm.

Thyridosmylus longiprocessus Xu, Wang & Winterton, sp. n.

Diagnosis: Frons brown with two dark brown markings; forewing hyaline, basal half with two brown stripes; male genitalia with ectoproct bearing a long dorsal rod-like process; distal part of gonarcus with abundant pilosity; basal part of mediuncus laterally with heart-shaped structures in dorsal view; spermatheca complex, with 13 sacs, basal one small and oval.

Etymology: Thve specific name “longiprocessus”, a compound from Latin longi- (long) and processus (process), which refers to the long dorsal process of ectoproct in male.

Distribution: Madagascar (Fianarantsoa).

Remarks: The male genitalia are not well sclerotized probably because it was teneral when it was collected. The sternite 8 in T. longiprocessus sp. n. is reduced into a sclerite without processes and the spermatheca is complex, consisting of 13 sacs, of which, the basal one is small and oval. Moreover, the dorsal process of ectoproct in male is quite long, clearly distinguished from other Thyridosmylus species, in which it is inconspicuous when it is observed in lateral view.

 Han Xu, Shaun L. Winterton, Yongjie Wang, Zhiqi Liu. 2017. Two New Species of Thyridosmylus Krüger, 1913 from Madagascar (Neuroptera, Osmylidae). ZooKeys. 724; 43-52.  DOI:  10.3897/zookeys.724.21057

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