Hydropsyche pallipenne Banks 1938

Seetapan, Kriengkrai & Prommi, Taeng On, 2022, The larvae of caddisfly species (Insecta, Trichoptera) in northern Thai streams and their relationships to environmental variables, Zootaxa 5222 (4), pp. 301-324 : 308-310

publication ID

https://doi.org/ 10.11646/zootaxa.5222.4.1

publication LSID

lsid:zoobank.org:pub:242B3947-087C-40D5-8BE1-2C7C9C261650

DOI

https://doi.org/10.5281/zenodo.7473291

persistent identifier

https://treatment.plazi.org/id/C114AE2B-FFAB-395A-02AC-0ADDF06054CF

treatment provided by

Plazi

scientific name

Hydropsyche pallipenne Banks 1938
status

 

Hydropsyche pallipenne Banks 1938

( Figs 2–19 View FIGURES 2–8 View FIGURES 9–15 View FIGURES 16–19 )

Larva: Total length 9.0–10.0 mm (n = 10). Overall body shape in alcohol generally as for other Hydropsychidae . Head yellow, except brown in posterolateral half of frontoclypeus. Thoracic nota yellow, each with lateral muscle scars ( Figs 2–4 View FIGURES 2–8 ).

Head: Head capsule length 0.88–0.97 mm; width 0.82–0.85 mm. Dorsum of head yellow except brown on either side of frontoclypeus posteriorly, frontoclypeus with posterolateral half brown, triangular yellow mark anteriorly, and circular yellow mark posteromesally. Frontoclypeus with anterior margin broadly and shallowly concave, slightly crenulate, with dense fringe of short setae extending along anterior margin ( Figs 3, 5 View FIGURES 2–8 ). Head with long, black, erect, truncate peg-like setae (tp) and acuminate peg-like setae (ap) on dorsal and lateral regions in anterior three-quarters ( Fig. 3 View FIGURES 2–8 ). Frontoclypeus with same setae scattered in anterolateral corners only ( Figs 3, 5 View FIGURES 2–8 ). Head ventrally yellow with darker brown pigmentation on pair of stridulatory surfaces; stridulatory files present ventrally near midlength ( Fig. 4 View FIGURES 2–8 ). Labrum light-brown; elliptical in dorsal view; bearing well-developed, golden- to light-brown setae anterolaterally, pectinate setae and stout setae on anterior half of dorsal surface ( Fig. 6 View FIGURES 2–8 ). Mandibles dark-brown with 2 apical and 3 mesal teeth, several long setae on lateral edges, left mandible with well-developed setal tuft mesally ( Figs 3, 4, 8 View FIGURES 2–8 ). Submentum light-brown, with anteromesal cleft, anterolateral margins with long setae. Anterior ventral apotome broadly triangular, posterior ventral apotome very small, triangular ( Figs 4, 7 View FIGURES 2–8 ).

Thorax: Nota yellow with slightly darker muscle scars laterally; densely covered with long, erect, truncate peglike setae and tapered hair-like setae, these same setae projecting beyond anterior margin. Pronotum with muscle scars midway between midline and lateral margin in posterior half; meso- and metanota with muscle scars laterally ( Figs 9−11 View FIGURES 9–15 ). Prosternite light brown, transverse, narrow, with fine, dark anterior margin and broad dark band along posterior margin; pair of large posterolateral sclerites each brown on submesal 2/3, yellow and brown on lateral 1/3 ( Fig. 12 View FIGURES 9–15 ). Foretrochantins deeply forked, each with long, black setae on ventral fork ( Fig. 13 View FIGURES 9–15 ). Forelegs each with numerous, feather-like setae on posterior surface of coxa; trochanter with feather-like setae on ventral margin; femur with row of long, dark, spike-like setae along ventral margin and short, dark, setae on external (posterior) surface ( Fig. 13 View FIGURES 9–15 ). Mid- and hind legs similar in size, shape, and structure; with feather-like setae on posterior surfaces of trochanters and femora ( Figs 14−15 View FIGURES 9–15 ). Mesosternum with one pair of gills and metasternum with 2 pairs of gills; gills each consisting of central stem bearing approximately 20 lateral filaments ( Fig. 2 View FIGURES 2–8 ).

Abdomen: Abdominal segments I–IX densely covered with slender, dark hair-like setae (hl) and triangular scale-like setae (sh) ( Figs 2 View FIGURES 2–8 , 16–17 View FIGURES 16–19 ). First sternum with 2 pairs of gills with adjacent bases. Segments II–V each with one pair of submedian ventral gills. Segments II–VII each with one pair of sublateral gills each arising from common base ( Figs 2 View FIGURES 2–8 , 19 View FIGURES 16–19 ). Sternum VIII with pair of small, triangular sclerites bearing spike-like setae ( Fig. 18 View FIGURES 16–19 , arrows). Sternum IX with pair of large triangular sclerites bearing spike-like setae emanating from prominent sockets ( Fig. 18 View FIGURES 16–19 , arrows). Tergum IX with pair of small lateral sclerites and pair of large subdorsal sclerites ( Fig. 19 View FIGURES 16–19 , arrow on right large subdorsal sclerite). Anal prolegs with bent claw and cluster of long bristles; their lateral sclerites with long, black setae; each with fan of long setae subapicodorsally ( Figs 2 View FIGURES 2–8 , 18, 19 View FIGURES 16–19 ).

Material examined: THAILAND: PHAYAO PROVINCE: Wieng Lor Wildlife Sanctuary, Huai Mae Jun, 434 m a.s.l., 19°15'44.0"N, 100°08'31.2"E, 25-x-2019, 12 larvae, 2 male pupae, 2 male adults, leg. Prommi; Phu Sang National Park, Nam Phuai Bon , 446 m a.s.l., 19°39'55.8"N, 100°22'37.4"E, 23-i-2021, 16 larvae, 4 male pupae, 3 male adults, leg. Prommi GoogleMaps ; Nam Phuai Lang , 474 m a.s.l., 19°40'27.9"N, 100°23'20.2"E, 24-i-2021, 33 larvae, 5 male pupae, leg. Prommi GoogleMaps ; Huai Pong Pha , 560 m a.s.l., 19°42'12.2"N, 100°23'56.6"E, 24-ix-2021, 18 larvae, 2 male pupae, 2 male adults, leg. Prommi GoogleMaps ; Huai Sai Guad , 485 m a.s.l., 19°43'52.6"N, 100°19'46.2"E, 25-ix-2021, 10 larvae, 1 male adult, leg. Prommi GoogleMaps ; Nam Yuan Ton , 510 m a.s.l., 19°30'02.5"N, 100°27'01.6"E, 25-vi-2021, 12 larvae, 3 male pupae, 1 male adult, leg. Prommi GoogleMaps ; Nam Yuan Huai Pum , 495 m a.s.l., 19°31'17.5"N, 100°24'25.0"E, 26-vi-2021, 13 larvae, 2 male pupae, 2 male adults, leg. Prommi. GoogleMaps

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