Lepidostoma scotti Ulmer, 1930

Terefe, Yonas, Vitecek, Simon & Graf, Wolfram, 2018, Description of the larva of Oecetismizrain Malicky & Graf, 2012 (Trichoptera, Leptoceridae) and Lepidostomascotti (Ulmer, 1930) (Trichoptera, Lepidostomatidae) from Chilimo Forest, Central Eth, ZooKeys 766, pp. 63-77: 63

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Lepidostoma scotti Ulmer, 1930


Lepidostoma scotti Ulmer, 1930  Figs 13-19, 20-24, 25


12 larvae: Ethiopia, Oromia Region, Chilimo forest N of Ginchi, 2451m a.s.l., 9.059719°N, 38.14332°E; 20.ii.2016; leg. & det. W. Graf; specimens deposited in the research collection of W. Graf at the University of Natural Resources and Applied Life Sciences Vienna [contact: wolfram.graf@boku.ac.at] and the Senckenberg Research Institute and Natural History Museum Trichoptera  collection [collection number SMFTRI00018577; contact: Steffen U. Pauls - steffen.pauls@senckenberg.de].

Description of 5th instar larva.

Biometry. Larva eruciform, body length 8-9.5 mm, head width 0.87-0.94 mm (n=8).

Head. Head capsule hypognathous, round; surface granulated, covered in spicules. Color pale to dark brown, with scattered black markings (Fig. 13), area around occipital margin dark brown (Figs 13, 14). Muscle attachment spots pale brown, > 10 on each parietalia, slightly asymmetrical, lining in rows, absent on frontoclypeus. Complete set of 18 primary setae present; setae 4, 5, 13, 15 and 17 very lightly colored; short antenna situated near the anterior margin of each eye, positioned on discrete protuberance (Fig. 13). Whitish ring present around eyes. Frontoclypeus with central constriction; ventral apotome triangular, yellow-brown (Fig. 14). Labrum with 6 pairs of setae, labral brushes at anterior margin present. Mandible robust, black, with 3 teeth.

Thorax. Pronotum fully covered by 2 sclerites (Fig. 15), pale brown to brown, at posterior (with small lateral process) and posterolateral margins thickened and darkly lined (Fig. 15); each sclerite bears 20-25 long dark setae mostly concentrated in anterior half (including two rows of setae along anterior margin) (Figs 15, 16). Prosternal horn present, whitish, curved anteriorly (Fig. 16). Mesonotum fully covered by 2 sclerites, brown to dark brown (black near median suture), posterior margin with slightly sclerotized narrow dark line; mesonotal setal areas sa1, sa2 and sa3 present; sa1 bearing 3-4 setae; sa2 bar-shaped, bearing 6-8 setae, stretching to posterior margin; sa3 bearing 5-6 setae; sa1 and sa3 connected by regular bands of setae (Fig. 15). Metanotum with 6 distinct small sclerotized areas, corresponding to setal areas sa1, sa2 and sa3; sa1 and sa2 rounded, each with 1 and 1-2 setae respectively (Fig. 15); sa3 elongate, falcate shaped, bearing 4-6 setae (Figs 15, 16). Thoracic legs yellowish brown, with dark marking at femoro-tibial joint and with dense fringe of setae on ventral edge of coxa, trochanter and femur and long dark setae (Fig. 17); foreleg more robust, shorter than mid- and hind leg; mid leg bearing larger number of setae (majority at the coxa) than fore- and hind legs; tarsal claws similar in all legs, short, robust (Figs 17-19).

Abdomen. Color whitish (Figs 20, 21). Abdominal segment I with lateral humps bearing 2 setae (1 on anteroventral margin, 1 on dorsal margin) (Figs 15, 16, 20, 21; highlighted by arrows in Figs 15, 16); dorsal hump absent (Figs 15, 16, 20); dorsal setal areas sa1 and sa3 absent, sa2 present, with a single seta (Fig. 15, dashed circles; Fig. 20); ventral setal areas sa2 and sa3 present, each with a single seta; sa1 absent (Figs 16, 21). Tracheal gills simple, unbranched, as single filaments; dorsal gills on segment II (postsegmental position), segments III–VI (pre- & postsegmental position) and segment VII (postsegmental position); ventral gills on segment II (postsegmental position), segments III–VI (pre- & postsegmental position) and segment VII (postsegmental position); lateral gills absent; position of ventral gills shifted dorsad (Figs 20, 25). Lateral line from segment III–VIII; small bifurcated lamellae dorsal to lateral line present (Figs 20, 25; position of bifurcated lamellae highlighted in dashed ovals). Dorsal sclerite of segment IX semicircular, pale brown, with 4 pairs of setae (outermost lateral and medial setae very long, with interspersed shorter setae) (Fig. 22); anal proleg present, of limnephilid type (Fig. 23).

Case. Larval case 9.0-10.5 mm long, constructed from rectangular pieces of plant material; pieces subrectangular to quadratic, parts of barks or leaves; cross-section subrectangular to subquadrangular, tapering towards the posterior end (Fig. 24).