Osmylus (Osmylus) hyalinatus McLachlan, 1875

Matsuno, Shigetomi & Yoshitomi, Hiroyuki, 2016, Descriptions of three larvae of Osmylus species from Japan (Neuroptera: Osmylidae), with a proposed naming system for the larval sclerites, Zootaxa 4189 (2), pp. 348-366 : 356-358

publication ID	https://doi.org/ 10.11646/zootaxa.4189.2.9
publication LSID	lsid:zoobank.org:pub:ACAF11E9-E39A-49E4-ACC0-DFF744D03CE1
DOI	https://doi.org/10.5281/zenodo.6084890
persistent identifier	https://treatment.plazi.org/id/03878F78-273D-1C54-FF25-27D409906DD7
treatment provided by	Plazi
scientific name	Osmylus (Osmylus) hyalinatus McLachlan, 1875
status

Treatment

Osmylus (Osmylus) hyalinatus McLachlan, 1875 View in CoL

( Figs 15 View FIGURES 15 – 17 , 18–19 View FIGURES 18 – 23 , 24 View FIGURES 24 – 26 , 27 View FIGURES 27 – 29 , 30–31 View FIGURES 30 – 35 , 36 View FIGURES 36 – 38 , 39–40 View FIGURES 39 – 44 )

Osmylus hyalinatus McLachlan, 1875 View in CoL , 181.

Other synonyms see Sekimoto & Yoshizawa (2011).

Description of 3rd instar larva. BL 10.8–18.0 (13.3, n = 16) mm.

Coloration. Head light brown, except for black colored stemmata and its surrounding parts; legs light yellow; dorsal side of thorax and abdomen basically light gray to gray; surrounding parts of DPa2 and DPm2 on meso- and metathoraces light brown; ventral side of thorax light yellow; surrounding parts of tubercles from metathorax to 8th abdominal segment yellow; sclerites brown; 9th and 10th abdominal segments and its sclerites light brown, subhyaline.

Head ( Fig. 15 View FIGURES 15 – 17 ). Mandiblomaxillary stylets rather short, about 2.0 times as long as head capsule length; ML/ CW 2.3–2.4 (2.3, n = 16). Frontal edge of cranium with 15–20 short setae (n = 6), without pores. Antennae 39 or 40 segmented (n = 2).

Prothorax ( Fig. 18 View FIGURES 18 – 23 ): DPc trapezoidal, separated with DM, its setae in middle part long, 1st to 3rd setae from within in posterior margin long. Mesothorax ( Figs 18–19 View FIGURES 18 – 23 ): DPm1 present; two short seta bearing on DPm2; DPm2 somewhat wide, its seta on anterior margin long; a seta on DPp1and DPp2 long. Metathorax ( Figs 18–19 View FIGURES 18 – 23 ): DAa expanded; DAm2 and DAm3 separated.

First abdominal segment ( Fig. 24 View FIGURES 24 – 26 ): DM1 absent; DM2, DPp1, and DPp4 roughly the size of DPp2; a seta on DM2, DPp1, and DPp4 long; DPa present; a seta in dorso-anterior part of LP long. Second to 5th abdominal segment ( Fig. 24 View FIGURES 24 – 26 ): DM3 absent; a seta on LA long. Sixth abdominal segment ( Fig. 24 View FIGURES 24 – 26 ): VM3 absent; other character states same to 2nd to 5th abdominal segments. Seventh abdominal segment ( Fig. 27 View FIGURES 27 – 29 ): VM3 absent. Eighth abdominal segment ( Fig. 24 View FIGURES 24 – 26 ): DPp1+DPp2 with a pore on anterior margin. Ninth abdominal segment ( Figs 30–31 View FIGURES 30 – 35 ): Dc bearing 7 pairs of long setae in posterior half margin; outer setal row on VPc composed of 2 setae and a pore in exterior margin.

Material examined. 2 exs., Takao-san, Takao-machi , Hachiôji-shi , Tokyo, 23.ii.2011 (collected in 3IL), 2.iv.2011 / 26.iii.2011 (PP), 15.iv.2011 / 7.iv.2011 (EM), S. Matsuno leg. ; 2exs., Morito-gawa, Hayama-machi, Miura-gun , Kanagawa Pref., 24.ii.2011 (collected in 3IL), 15.iv.2011 / 15.iv.2011 (PP), 26.iv.2011 / 27.iv.2011 (EM), S. Matsuno leg. ; 1 ex., (3IL), Kunigami, Bunsui-cho , Niigata Pref., 13.iii.2007, M. Hayashi leg. ; 2 exs., (2 3IL), Shinjô, Daitô-cho, Unnan-shi , Shimane Pref., 8.viii.2007, M. Hayashi leg. ; 2 exs., Hijiri-ko campsite, Kitahiroshima-chô, Yamagata-gun , Hiroshima Pref., 30.iv.2011 (collected in 3IL), 15.v.2011 / 17.v.2011 (PP), 24.v.2011 / 26.v.2011 (EM), S. Matsuno leg.; 5 exs. (1 2IL & 4 3IL), Kanmuri-kôgen, Yoshiwa, Hatsukaichi-shi , Hiroshima Pref., 25.ix.2010, M. Sakamoto leg. ; 1 ex., Saragamine, Tôon-shi , Ehime Pref., 12.vi.2009 (collected in 3IL), 7.vii.2009 (PP), 21.vii.2009 (EM), R. Ogawa leg. ; 1 ex. (3IL), same locality, 6.iii.2009, H. Yoshitomi leg. ; 2 exs. (3IL), same locality, 26.iii.2009, S. Matsuno leg. ; 7 exs. (5 1IL & 2 3IL), same locality, 11.x.2010, S. Matsuno leg. ; 1 ex. (3IL), same locality, 26.x.2010, S. Matsuno leg. ; 1 ex. (2IL), Omogokei, Kumakôgen-chô , Ehime Pref., 19.viii.2010, S. Matsuno leg. ; 3 exs. (2IL), same locality and collector, 14.ix.2010; 2 exs. (3IL) , same locality and collector, 23.xi.2010; 1ex., Omogo-kei , same locality, 7.iii.2011 (collected in 3IL), 8.iv.2011 (PP), 21.iv.2011 (EM), S. Matsuno leg. ; 3 exs. (1 2IL & 2 3IL), same locality, 13.xi.2011, S. Matsuno leg. ; 2 exs., Komeno-machi, Matsuyama-shi , Ehime Pref., 12.iv.2009 (collected in 3IL), 20.iv.2009 / 21.iv.2009 (PP), 30.iv.2009 / 1.v.2009 (EM), S. Matsuno leg. ; 3 exs. (3IL), Sugesawa-machi, Matsuyama-shi , Ehime Pref., 7.xii.2011, S. Matsuno leg. 3 exs. (2IL), Higashino, Matsuyama-shi , Ehime Pref., 3.xi.2011, S. Matsuno leg.

Remarks. This species is similar to the sympatric species, O. (O.) pryeri , in general appearance (e.g., coloration of body), but clearly differs from it in the shorter mandiblomaxillary stylets ( Fig. 36 View FIGURES 36 – 38 ).

Biological notes. This is the most common species in Japan, and collected from ca. 100–1,000 m in altitude. They frequently hide in pockets under waterlogged decayed wood lying in small and shallow streams ( Figs 39–40 View FIGURES 39 – 44 ). In some cases, they were collected from under stones or in moss in a stream.

The pupal periods are 10–12 days (10.7 days in average) in a rearing condition of under 22? (n = 3), 9 days under 20? (n = 2), and 11–13 days (12.2 days in average) under 18? (n = 5).

Distribution. Japan (Hokkaidô, Rishiri, Kunashir, Honshû, Shikoku, Kyûshû, Yakushima).