Stactobia kanagawa, Ito, 2017

Ito, Tomiko, 2017, The genus Stactobia McLachlan (Trichoptera, Hydroptilidae) in Japan, Zootaxa 4350 (2), pp. 201-233 : 208

publication ID	https://doi.org/ 10.11646/zootaxa.4350.2.1
publication LSID	lsid:zoobank.org:pub:2692F486-4EEA-4B62-BC88-8EEF71AB9C0F
DOI	https://doi.org/10.5281/zenodo.6034141
persistent identifier	https://treatment.plazi.org/id/03E31C49-FFD3-323C-FF37-FE43FB560035
treatment provided by	Plazi
scientific name	Stactobia kanagawa
status	sp. nov.

Treatment

Stactobia kanagawa sp. nov.

( Figs 4 View FIGURE 4 , 18 View FIGURE 18 )

Stactobia makartschenkoi (in part): Botosaneanu & Nozaki 1996, 55. Misidentification (a male collected from Shizuoka).

Diagnosis. This species also belongs to the S. martynovi Species Group. The male of this species resembles that of S. makartschenkoi in the shape of the subgenital appendages and inferior appendages, but clearly differs from the latter by the shape of the phallus: Spoon-shaped with gently convex lateral edges and a roundish sclerite apically in this species, but spoon-shaped without any convex edges or a sclerite in S. makartschenkoi .

Description. Male ( Figs 4A–4G View FIGURE 4 ). Antennae each 18-segmented and 0.9–1.0 mm long (n = 5). Length of each forewing and hind wing 1.8–2.0 mm and 1.5–1.6 mm, respectively (n = 5). Tibial spur formula 1, 2, 4.

Genitalia. Tergite VII longer than sternite VII, ventral process long, with expanded spiny apex. Tergite VIII longitudinally shorter than sternite VIII. Tergite IX with pair of long anterior apodemes, sternite IX reduced. Tergite X semimembranous with oblique weakly sclerotized areas dorsolaterally. Subgenital appendages very small, transverse, linear, rounded mesally. Inferior appendages small, rectangular with irregularly protruding margins. Phallus tubular, almost straight, gently sinuate in most specimens, spoon-shaped apically with gently convex lateral edges and roundish dorsal sclerite at apical 1/4; 2 slender spines internally, 20–30 times as long as basal width, one of them indistinct due to weak sclerotization in some specimens.

Final instar larva ( Figs 4H–4J View FIGURE 4 ). Sclerites dark brown. Head about 0.29 mm wide, body up to 1.9 mm long. Thorax: Setae of nota numbering about 35, 25, and 20, respectively; venter of prothorax with mesal pair of sclerites transversely wide, short, concave laterally, lateral sclerites small, nearly V-shaped; pair of very short and wide sclerites in mesothorax. Abdominal segments I–VIII each with mid dorsal tergite and pair of small round sclerites laterally. Other features typical of genus.

Case ( Figs 4K, 4L View FIGURE 4 ). Length up to 2.6 mm. Anterior and posterior hoods large, convex, each with tiny notch at middle. Other features typical of genus.

Type series. Holotype. Male, HONSHU, Kanagawa, Yugawara-machi , Makuyama , Niizaki-gawa , 35˚10’02”N, 139˚5’18”E, 200 m a.s.l., 19.iii.1997, TN (CBM-ZI 165991).

Paratypes. 5 males, same data as holotype (CBM-ZI 165992–165996).

Other specimens. HONSHU. Kanagawa: 26 males, 4 pupae, 6 final instar larvae, same data as holotype ; 22 males, Minami-ashigara-shi, Yagura-zawa, Kari-gawa, 360 m a.s.l., 28.v.2007, TN (18 males in PTN, 4 males in PTI). Gifu: 1 male, Kokufu-cho, Utsue-gawa, Shijuhachi-taki, 28.v.2001, K. Endo . Shizuoka: 1 male, Amagiyugashima-cho, Funabara-gawa, 550 m a.s.l., 14.v.1995, TH ( PTN) . Hyogo: 1 male, Kami-cho, Yamada, 30.iv.2006, K. Inazu. KYUSHU . Oita: 6 males, Nakatsu-shi, Orito-gawa, Fukayabakei, 6.v.1997, HN.

Distribution ( Fig. 18 View FIGURE 18 ). Honshu (Kanagawa, Gifu, Shizuoka, Hyogo); Kyushu (Oita).

Habitat. Larvae of this species were collected by the above colleagues from rapidly flowing streams.

Ethymology. The name “ kanagawa ” is a noun in apposition, coined from the type locality.

Japanese name. Kanagawa-kaku-himetobikera.

Remarks. I examined a male from Funabara-gawa, Amami-yugashima-cho, Shizuoka, which was recorded as S. makartschenkoi by Botosaneanu & Nozaki (1996), and recognized that it belongs to this species.