Isonychia taishunensis Huang, Shen, Zhang & Cheng, 2024
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publication ID |
https://doi.org/ 10.11646/zootaxa.5437.4.6 |
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publication LSID |
lsid:zoobank.org:pub:81FBDC30-37A6-4F74-A445-774E8DBDDC31 |
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DOI |
https://doi.org/10.5281/zenodo.10985616 |
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persistent identifier |
https://treatment.plazi.org/id/03FF87C9-9607-FF95-0180-F8B1FDE0F8F2 |
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treatment provided by |
Plazi |
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scientific name |
Isonychia taishunensis Huang, Shen, Zhang & Cheng |
| status |
sp. nov. |
Isonychia taishunensis Huang, Shen, Zhang & Cheng sp. nov.
( Figures 1–4 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 )
Chinese name: ṺĤḘÑ
Material examined
Holotype: Female mature larva (in ethanol), Daxiyuan Provincial Nature Reserve (N 27°28′58′′, E 119°50′21′′), Taishun County, Zhejiang Province, China, 10. V. 2023, Chen-Yang Shen and Jie-Hong Ji GoogleMaps . Paratypes (in ethanol): 7 larvae with the same data and collectors as holotype GoogleMaps .
Description. Female, larvae (in ethanol): body length 14.7–15.7 mm, cerci fractured, 1.0–2.0 mm, terminal filament fractured, 5.9–6.0 mm; body dark brown, with a marked pale median longitudinal line from frons to tergite IV ( Fig. 1 A–F View FIGURE 1 ); legs with pale and dark bands ( Fig. 3 A–F View FIGURE 3 ), gills with purple or dark pigments ( Fig. 4 A–G View FIGURE 4 ).
Head: genae dark, lateral 1/3 of clypeus brown but median 1/3 pale ( Fig. 1 C View FIGURE 1 ); antennae length 3.9–4.0 mm, subequal to twice width of head. Anterior 1/2 of scape and pedicel darker than posterior 1/2. Flagellum of antennae smooth, with about 24 segments ( Fig. 1 E View FIGURE 1 ). Frontal carina pale yellow, markedly sharp, area between three ocelli brown, area between median ocellus and compound eyes pale. Vertex smooth and convex. Base of ocelli dark ( Fig. 1 D View FIGURE 1 ). Mouthparts: anterior margin of labrum with long hair-like setae, lateral 1/3 of dorsal surface covered with strong bristles while median 1/3 without; anterior margin pale, almost straight, lateral margins dark, slightly convex ( Fig. 2 A View FIGURE 2 ). Left mandible: apex of both inner and outer incisor divided into three denticles, inner incisor slightly thinner than outer one; medial margin of molar lobe wide, slightly concave ( Fig. 2 B View FIGURE 2 ). Right mandible: apex of outer incisor divided into three denticles, inner two, molar lobe relatively sharp compared with left one ( Fig. 2 C View FIGURE 2 ). Hypopharynx: lingua whitish, nearly circular, with hair-like setae on apex; superlinguae whitish, possessing a yellowish line in middle, basal 1/3 of lateral margins of slightly convex, apex with longer hair-like setae ( Fig. 2 D View FIGURE 2 ). Maxillary palpi yellowish, lateral margin brown, length ratio of segments I and II 1.0: 2.0; apical segment covered with strong hair-like setae and broader than basal one ( Fig. 2 E View FIGURE 2 ). A whitish gill tuft on outer margin of cardo. Apex of lacinia with two conspicuous canines, mesal margin with a row of setae, one distinct spine among them ( Fig. 2 E,F View FIGURE 2 ). Apex of galea processing a row of dense hair-like setae. Glossae-paraglossae of labium heart-shaped, brown, the latter significantly broader than the former, surface of them with dense hair-like setae. Labial palpi brown, length ratio of segment I and segment II 1.0: 2.0, outer margin of apical segment with long hair-like setae, inner margin of it with dense, brush-like setae, these near apex longer ( Fig. 2 G View FIGURE 2 ). Thorax: dark brown, with a median pale line on dorsal surface, a thin dark line located within the pale line on cephalic 1/2 of mesothorax ( Fig. 1 A View FIGURE 1 ). Meso and metasternum respectively with a projection directed posteriorly, the latter one shorter and slightly broader ( Fig. 1 D View FIGURE 1 ). Coxa of forelegs attached with a gill tuft, base of the gill tuft pale, apex yellowish brown. Femora of foreleg with three yellowish bands distributed on base, middle and apex, both tibiae and tarsi with two yellowish bands on base and apex, but the bands on base of tarsi are relatively short, claw yellowish but its apex brown, four or five denticles can be spotted on the inner margin of foreclaw. Inner margin of foreleg with long hair-like setae but outer margin with spines, 5 on femora and tibiae respectively and 2 on tarsi; a distinct long spine on apex of tibiae, slightly bent, its length approximately equal to 2/3 tarsi. Length ratio of femora: tibiae: tarsi of foreleg 1.00: 1.06: 0.58 ( Fig. 3 A,D View FIGURE 3 ). Pigments of midleg resemble to foreleg, both outer and inner margins with spine, apex of tibiae without a long bent spine. Claw of midleg with six or seven denticles. Length ratio of femora: tibiae: tarsi of midleg 1.00: 0.68: 0.37 ( Fig. 3 B,E View FIGURE 3 ). Pigments pattern of hindleg resemble to midleg, the former possesses more spines on outer margin of femora, apex of tibiae without a long bent spine consistently. Ventral cleft of femora with four very short spines. Claw of hindleg with nine or ten denticles. Length ratio of femora: tibiae: tarsi of foreleg 1.00: 0.58: 0.36 ( Fig. 3 C,F View FIGURE 3 ). Abdomen: brown, with a pale median line on terga I–IV ( Fig. 1 A View FIGURE 1 ). Posterolateral angles of terga VIII and IX extended sharply, posterior margin of sternite IX caudally extended with its middle 1/2 strongly concave near semicircle ( Fig. 4 H View FIGURE 4 ). Tergum X brown ( Fig. 1 A View FIGURE 1 ). Gills I–VII similar in pigment and tracheation, but larger progressively from anterior to posterior. Gill plates VI and VII with small spines on apical margin, lobes I–V without. Each gill plate possesses three sclerotized ribs, two along anterior and posterior margins, respectively, and one on middle rear of dorsal surface. Two purple or dark speckles on each lobe, both attached to the mid rib. Each gill plate possesses a similar tracheation located between anterior rib and mid rib. Posterior margin of each gill plate more curvy than anterior one; a tuft of gill filament attached at the base of each lobe with darker apical 1/2 and pale basal 1/2 ( Fig. 4 A–G View FIGURE 4 ). Caudal filaments: fractured, mesal margin of cerci and lateral margins of terminal filaments with strong hair-like setae ( Fig. 1 F View FIGURE 1 ).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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