Neotropical osmylids (Neuroptera, Osmylidae): Three new species of Isostenosmylus Krüger, 1913, new distributional records, redescriptions, checklist and key for the Neotropical species

Abstract

Osmylidae is a small family of Neuroptera with a worldwide distribution. Only four subfamilies and five genera of Osmylidae have been reported to date for the Neotropical region, with a total of 16 species, whilst 200 species are known in the world. In this study three new species are described-Isostenosmylus bifurcatus n. sp., I. irroratus n. sp. and I. julianae n. sp. Moreover, species of Gumilla Navás, 1912 and Paryphosmylus Krüger, 1913 are redescribed; additionally one larva of Isostenosmylus sp. and the female of Isostenosmylus fasciatus Kimmins, 1940 are described. Images of type specimens of Neotropical species of Osmylidae are provided. New records of known species are reported and a distribution map is presented. An updated checklist and a key for Neotropical species of Osmylidae are provided.

New Philippine species of Spilosmylus Kolbe (Neuroptera, Osmylidae)

“…Wang et al (2011), Winterton and Wang (2016) and Winterton et al (2017) used an updated version of the classical terminology of Tjeder (1957) and Adams (1969), based on comparisons and homology assessments across the whole family and with other Neuroptera. On the other hand, Aspöck and Aspöck (2008) proposed a different terminology, which was recently extensively applied to Osmylidae by Martins et al (2016). However, as discussed in length by Winterton et al (2017), the lack of adequate comparisons among the numerous subfamilies of Osmylidae hampered the recognition of genital sclerites in this family.…”

Revision of the genus Gryposmylus Krüger, 1913 (Neuroptera, Osmylidae) with a remarkable example of convergence in wing disruptive patterning

“…The parameres are always closely associated with the mediuncus (pink colour), either immediately flanking the mediuncus (e.g., Osmylinae), cradling from below (e.g., Spilosmylinae) or immediately anterior to it (Protosmylinae). We follow Adams (1969) in the use of mediuncus for the main intromittent organ, which is equivalent to the parameres of some authors (e.g., Tjeder 1957; New 1986), or more recently the gonocoxite 10 complex of Aspöck and Aspöck (2008) and Martins et al (2016), or gonocoxites by Ardila-Camacho and Noriega (2014). The gonarcus is variable in form depending on the subfamily, being relatively narrow, arching medially and lacking setae in Protosmylinae and Spilosmylinae.…”

“…In Kempyninae and Stenosmylinae they are larger and subtriangular in shape. Aspöck and Aspöck (2008) and Martins et al (2016) interpreted the gonarcus and entoprocessus as a complex of gonocoxite 9 and gonopophyses 9, respectively. In the female genitalia (Fig.…”

“…In all subfamilies there is a terminal stylus (gonostylus 9). Sternite 8 ( sensu New 1986) has also been referred to as the subgenitale ( sensu Tjeder 1957), or as a fusion of gonocoxite8+gonopophyses 8 by Aspöck and Aspöck (2008) and Martins et al (2016). The shape and position of this sclerite is highly variable.…”

Revision of the genus Heterosmylus Krüger, 1913 from China (Neuroptera, Osmylidae)

“…Moreover, the base of costal-field of forewing of Heterosmylus species is narrower compared with that of Gryposmylus . Heterosmylus differs from Paryphosmylus in that the wings are mostly hyaline and single cross-vein presents before the separation of basal branch of Rs (Martins et al 2016). …”