Hydropsyche doehleri Tobias 1972

Vicentini, Heinrich, Wyler, Sofia & Waringer, Johann, 2020, The larva of Hydropsyche doehleri Tobias 1972, based on Swiss material (Hydropsychidae, Trichoptera), Zootaxa 4786 (4), pp. 535-545 : 536-540

publication ID

https://doi.org/ 10.11646/zootaxa.4786.4.5

publication LSID

lsid:zoobank.org:pub:33A7EFE7-356D-4D55-907C-D6C62D33C5A2

DOI

https://doi.org/10.5281/zenodo.4323790

persistent identifier

https://treatment.plazi.org/id/125D9655-FC5B-B341-FF08-E7E086AAFC6E

treatment provided by

Felipe

scientific name

Hydropsyche doehleri Tobias 1972
status

 

Description of the final instar larva of Hydropsyche doehleri Tobias 1972 View in CoL

Biometry. Body length 15.0– 17.8 mm, head width 1.56–1.72 mm (n = 7).

Head. Head capsule prognathous, surface smooth, roundish, maximum width at mid-length, tapering anteriorly and posteriorly ( Figs. 2–5 View FIGURES 2–5 ). Coloration chestnut brown; on parietalia, with large pale rings around eyes ( Fig. 6 View FIGURES 6–11 ), and with yellow ventrolateral area extending from near anterior to posterior borders; posterior section of yellow area only half as wide as anterior area ( Fig. 6 View FIGURES 6–11 ). Frontoclypeal apotome ogival, its maximum width at straight anterior border ( Fig. 2 View FIGURES 2–5 ); anterior 2/3 of frontoclypeal suture slightly tapering posteriorly and almost parallel-sided; posterior branches of frontoclypeal suture meeting at near right angle ( Fig. 2 View FIGURES 2–5 ). Frontoclypeal step continuous, present also at center of sclerite ( Fig. 6 View FIGURES 6–11 , arrow). Typically, yellow patches on frontoclypeal apotome consisting of two pairs of yellow lateral patches, mesal anterior and posterior patches indistinct ( Figs. 2–4 View FIGURES 2–5 ); in dark individuals, only anterior pair of lateral patches distinctly yellow ( Fig. 5 View FIGURES 2–5 ). Borders of frontoclypeal apotome and lateral sections of parietalia densely covered by secondary acuminate peg setae ( Figs. 2–4 View FIGURES 2–5 , 6 View FIGURES 6–11 ). Ventrally, parietalia dark brown, with narrow yellow anterior border and narrow yellow band along anterior half of hypocranial suture ( Fig. 7 View FIGURES 6–11 ). Striae of stridulatory file within dark brown coloration ( Fig. 10 View FIGURES 6–11 , dotted oval). Parietalia touching ventrally, thereby creating anterior ventral apotome (= submentum; sm in Fig. 7 View FIGURES 6–11 ); posterior ventral apotome reduced. Anterior section of submentum with pronounced median division (arrow in Fig. 7 View FIGURES 6–11 ), posterior section broadly triangular with short, wide lateral lobes (sm in Fig. 7 View FIGURES 6–11 ). Yellowish-brown mandibles slightly asymmetrical, with black cutting edges and teeth. Each mandible consisting of dorsal and ventral blades along mesal margin, each blade with one apical tooth; each ventral blade with 3 subapical teeth along its edge, each dorsal blade with small subapical tooth and curved cutting edge ( Fig. 2 m View FIGURES 2–5 ).

Thorax. Pro-, meso- and metanota fully sclerotized; pronotal sclerites separated by median dorsal ecdysial line, the latter lacking on meso- and metanotal sclerites ( Fig. 8 View FIGURES 6–11 ). Transverse ecdysial suture lacking on all notal sclerites. Tergites densely covered by small bristles. Pronotal sclerite (pn in Fig. 8 View FIGURES 6–11 ) dark brown, with black, straight posterior border. Mesonotal sclerites (msn in Fig. 8 View FIGURES 6–11 ) with black borders and sinuate, M-shaped posterior border heavily sclerotized in median section; mesonotal surface with dark median longitudinal band and dark bands extending from anterolateral corners to center of posterior border. Metanotal sclerites (mtn in Fig. 8 View FIGURES 6–11 ) yellowish, with black trimming along lateral border and anterolateral corners; posterior border slightly concave, with black central bar; black bands extending from anterolatereal corners to brownish area at rear center of sclerites.

Prosternal plate (a in Fig. 9 View FIGURES 6–11 ) broadly trapezoidal, with elongate and enlarged anterolateral corners and pair of symmetrical, shallow concavities along black anterior border; with dark bar along posterior border (posterior part of a in Fig. 9 View FIGURES 6–11 ). Intersegmental fold posterior to prosternal plate with pair of sclerites, each one consisting of dark brown rhomboidal median section (pm in Fig. 9 View FIGURES 6–11 ) and yellowish, funnel-shaped lateral section (pl in Fig. 9 View FIGURES 6–11 ), the latter with concave, black lateral border.

Foretrochantin (ft in Fig. 10 View FIGURES 6–11 ) yellow, with black ventral border, forked (arrows in Fig. 10 View FIGURES 6–11 ). Mid- and hind pleural sclerites smaller, elongate triangular, with blackish ventral margins (mps and hps in Fig. 11 View FIGURES 6–11 , respectively). Legs yellow to yellowish brown, with numerous secondary setae on coxae, trochanters, and femora; tibiae and tarsi with smaller numbers of setae ( Figs. 10, 11 View FIGURES 6–11 ). Each forefemur club-shaped, with broad, concave anterodorsal border apically. All femora with long ventral setal fringes. Tarsal claws long and slender, slightly curved, pointed, each with basal spur ( Figs. 10, 11 View FIGURES 6–11 ). Prosternum without gills, gills of meso- and metasterna each with branches originating from truncate base.

Abdomen. Abdomen near white to pale purplish–blue, with coloured areas subdivided by pale bands ( Fig. 12 View FIGURES 12–15 ; coloration may be modified by preservation), and densely covered with hairlike setae (hs in Fig. 13 View FIGURES 12–15 ) and clavate scale hairs (sh in Fig. 13 View FIGURES 12–15 ). Each segment with 2 pairs of groups of dorsal primary setae, including posterior subdorsal pair (sa 2 in Fig. 12 View FIGURES 12–15 ) and dorsolateral pair (sa 3 in Fig. 12 View FIGURES 12–15 ). In addition, with pupal gill buds [not appearing before the final (fifth) instar in Hydropsychidae ] (dotted oval in Fig. 12 View FIGURES 12–15 ). Abdominal segments 1–6 with pair of multibranched gills matching morphology of gills on thoracic segments (g in Fig. 12 View FIGURES 12–15 ). Lateral fringe lacking. Pair of ventral sclerites on each of abdominal segments VIII and IX yellowish brown, conical, pointing in anterior direction, with scler- ites of segment IX much larger (vs in Fig. 14 View FIGURES 12–15 ). Segment IX with dark dorsal sclerite and pair of dark lateral sclerites (ds and ls in Fig. 15 View FIGURES 12–15 , respectively). Segment X with anal papillae (ag in Fig. 15 View FIGURES 12–15 ). Anal prolegs with sclerites orange, each consisting of lateral area sclerite, ventral sole plate, large, sickle-shaped anal claw, and apicodorsal brush of long setae (la, vsp, ac, and st in Fig. 15 View FIGURES 12–15 , respectively).

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