Stactobia campire Ito 2017, sp. nov.
Creators: name: Ito, Tomiko
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Trichoptera
Hydroptilidae
Stactobia
Stactobia campire

description: Stactobia campire sp. nov.
(Figs 15, 16, 19)
Stactobia sp.: Ito & Saito 2016, 468, mitochondrial DNA, Ryukyu Islands (Iriomote-jima).
Diagnosis. This species belongs to the S. nielseni Species Group. The male of this species is slightly similar to that of S tactobia tonyi Wells & Huisman 1993, known from Malaysia, in having spinose inferior appendages, but clearly differs from the latter by the shape of the phallus: The phallus has a slender rod and short spine apically in this species, but the phallus has a sclerotized band and 2 spines in S. tonyi.
Description. Male (Figs 15A–15E). Antennae each 18-segmented and 0.6–0.7 mm long (n = 5). Length of each forewing and hind wing 1.6–1.7 mm and 1.3–1.4 mm, respectively (n = 5). Tibial spur formula 1, 2, 4.
Genitalia. Sternite VII slightly shorter longitudinally than tergite VII, ventral process long with expanded spiny apex. Tergite VIII longitudinally short, sternite VIII twice as long as tergite, swollen at posterior 1/3. Tergite IX large with pair of long anterior apodemes, sternite IX reduced. Tergite X large, semimembranous, subquadrate in dorsal view, roundish apically in lateral view, weakly sclerotized dorsally. Subgenital appendages subtriangular, directed ventrocaudad in lateral view. Inferior appendages long bar-like, 3 times as long as wide, subacute apically in lateral view; slightly bowed outward at apical half and gently directed mesad apically in ventral view. Phallus tubular, broadly curved, acute or truncate apically, with slender rod and spine at apical 1/3; bar weakly sclerotized, almost 1/4 as long as phallus; spine strongly sclerotized, very short, 2 times as long as basal width, directed posterad.
Final instar larva (Figs 15F–15H). Sclerites black. Head about 0.22 mm wide, body up to 2.0 mm long. Thorax: Setae numerous, numbering 40–45 setae on each plate of 3 pairs of notal plates; pair of very short and transversely wide sclerites on prosternum. Each of abdominal terga III–VII with transversely wide sclerite dorsally; each of terga I–VI with pair of slender transverse sclerites near posterior margin (“intersegmental sclerites” in Waringer & Graf 2011); terga I–VII with pair of very small, often indistinct, round sclerites dorsolaterally. Other features typical of genus.
Early instar larva (Figs 16A–16E). Beetle-like appearance. Head 0.18 mm wide in penultimate instar, body length up to 1.7 mm, penultimate instar larva almost same size as final instar larva. Pronotal plate subquadrate with 5 pairs of long thick setae and many short slender setae dorsally and short spines on anterior edge and anterolateral corners. Mesonotal and metanotal plates wide, lateral margins convex; 2 long stout setae at middle of each lateral margin, strongly directed laterad; long thick setae also on anterior and posterior margins; many long and short setae and short spines on anterior edges and anterolateral corners. Dorsal plates on abdominal terga I –VIII distinctly convex laterally, each with long stout seta laterally and long stout seta near posterolateral margin; several short setae dorsally and short spines laterally.
Case of larva (Figs 16F, 16G). Tubular, somewhat flattened dorsoventrally (depressed), slightly swollen laterally at middle; dorsal surface almost completely covered with sand grains, ventral valve made of silk alone. Anterior and posterior hoods absent. Length up to 2.2 mm.
Type series. Holotype. Male, RYUKYU ISLANDS, Iriomote-jima, Urauchi-gawa, Kampire-no-taki, 24˚21’17”N, 123˚48’28”E, 83 m a.s.l., 22.iii.2016, TI (CBM-ZI 166010).
Paratypes. 2 males, same data as holotype (CBM-ZI 166011–166012).
Other specimens. RYUKYU ISLANDS. Iriomote-jima: 8 males, same data as holotype; 22 pupae, 6 prepupae, 26 final instar larvae, type locality, 25.iii.1999, TI & AO; 1 male, 6 pupae, 181 final instar larvae, 8 early instar larvae, type locality, 30.xi.2013, TI & R. Saito; 1 male, 1 pupa, 2 prepupae, 126 final instar larvae, 38 early instar larvae, type locality, 22.x.2016, TI.
Distribution (Fig. 19). Ryukyu Islands (Iriomote-jima). Known only from the type locality.
Habitat. The larvae of this species were abundant on the smooth rock surfaces in a very large waterfall, Kampireno-taki, Iriomote-jima, Ryukyu Islands, together with larvae of Plethus ukalegon Malicky & Chantaramongkol (Ito & Saito 2016). A quantitative survey on 22 October 2015, clearly showed that final instar larvae were more abundant in slowly flowing parts (about 40 cm /sec) than in rapidly flowing parts (about 120 cm /sec), i.e., mean 2.0 larvae/ 100 cm 2 in slow flow (n = 30) versus mean 0.1 larvae/ 100 cm 2 in rapid flow (n = 30). This habit is different from that of P. ukalegon, the larvae of which were almost equally abundant in both slow and rapid flow [mean 22.2 larvae/ 100 cm 2 (n = 30) in slow flow versus mean 21.8 larvae/ 100 cm 2 (n = 30) in rapid flow].
Ethymology. The name “ campire ” is a noun in apposition, coined from the type locality.
Japanese name. Kampire-kaku-himetobikera.
Remarks. Some larval features of this species are similar to those of 2 European species, Stactobia moselyi Kimmins 1 949 and S. caspersi Ulmer 1950. The very slender, transverse sclerites of abdominal segments I–VI resemble those of S. moselyi (Waringer & Graf 2011), and the early instar larva and sandy tubular case are very similar to those of S. caspersi (Cianficconi et al. 2005).
description: Published as part of Ito, Tomiko, 2017, The genus Stactobia McLachlan (Trichoptera, Hydroptilidae) in Japan, pp. 201-233 in Zootaxa 4350 (2) on pages 225-230, DOI: 10.11646/zootaxa.4350.2.1, http://zenodo.org/record/1053028