Pseudogagrella nigridorsa Chen & Shih, 2017, sp. nov.
Creators: name: Chen, Ssu-Li
name: Shih, Hsi-Te
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Opiliones
Sclerosomatidae
Pseudogagrella
Pseudogagrella nigridorsa

description: Pseudogagrella nigridorsa sp. nov.
(Figs. 3–4)
Type material. Holotype: 1 ♂ (NCHUZOOL 14843), Lalashan National Forest Sanctuary, Fusing, Taoyuan City, Taiwan, 24°42’35.58”N, 121°26’13.24”E, elevation of 1614 m, coll. S.- L. Chen, 9 Jul. 2014. Paratypes: 1 ♂ (NCHUZOOL 14844), 1 ♀ (NCHUZOOL 14845) and 2 ♀♀ (NCHUZOOL 14846), same data as holotype; 1 ♂ (NCHUZOOL 14847), Lalashan National Forest Sanctuary, Fusing, Taoyuan City, Taiwan, 24°42’35.43”N, 121°26’13.65”E, elevation of 1609 m, coll. S.- L. Chen, 1 Jun. 2014; 1 ♀ (NCHUZOOL 14848), Lalashan National Forest Sanctuary, Fusing, Taoyuan City, Taiwan, 24°42’32.41”N, 121°26’12.82”E, elevation of 1588 m, coll. S.- L. Chen, 10 Jul. 2014; 1 ♀, Juvenile (NCHUZOOL 14849), Lalashan National Forest Sanctuary, Fusing, Taoyuan City, Taiwan, 24°42’38.69”N, 121°26’18.36”E, elevation of 1619 m, coll. S.- L. Chen, 10 Jul. 2014; 1♀ (NCHUZOOL 14850), Lalashan National Forest Sanctuary, Fusing, Taoyuan City, Taiwan, 24°42’35.43”N, 121°26’13.65”E, elevation of 1609 m, coll. S.- L. Chen, 1 Jun. 2014; 1 ♂ (NCHUZOOL 14851), Lalashan National Forest Sanctuary, Fusing, Taoyuan City, Taiwan, 24°42’35.43”N, 121°26’13.65”E, elevation of 1609 m, coll. S.- L. Chen, 31 May 2014; 1 ♂ (NMNS-7707-003), 1 ♂ (ZMB / Arach 48782), and 1 ♀ (ZMB / Arach 48783), same data as holotype.
Etymology. The name is derived from the Latin niger and dorsum, for the color of male adult body, especially the deep black of the abdominal tergites.
Diagnosis. Pseudogagrella nigridorsa differs from all other Taiwanese species in having black body. It is most similar to P. arishana (Suzuki 1977: fig. 10A–L); however, all legs of P. nigridorsa are black, but legs of P. arishana are dark brown, with brown rings; and the stylus of glans of P. nigridorsa is acicular, which is not found in P. arishana.
Description. Male holotype. Dorsal surface of body glossy. Supra-cheliceral lamellae tipped with few tubercles (Fig. 3 I). Abdomen with one short median spine on the second tergite. Ocularium nearly elliptic (Fig. 3 D–E), with two rows of two setae. Eye ring black, dark between eyes. All free sternites and genital operculum granulate, with sparse hairs. Surface of all coxae with coarse granules. All coxae with a row of humps anteriorly and posteriorly.
Chelicera (Fig. 3 J–K). Basal segment with a few setae, ventral spur below; medial aspect with black-tipped tubercles. Distal segment with some setae above, ectal aspect smooth, medial aspect with some black-tipped tubercle.
Pedipalp (Fig. 3 A–B). All segments setose, excepting trochanter. Femur with a few denticles on ectal aspect, some ventral spine-tipped tubercle on ectal aspect. Patella swollen into a slight lobe at inner tip. Tibia slightly thickened, with dense covering of hairs below. Tarsus elongated, with a row of denticles on medial aspect. Claw pectinate.
Legs. All legs slim and elongate. Trochanters mound-shaped (Fig. 4 A), all femora without false articulations, tarsus longer than tibia.
Penis (Fig. 3 F–G). Shaft 2.29 long, 0.27 wide at base, 0.23 wide at middle; glans 0.33 long, 0.1 wide at base. Shaft wide, with sides nearly parallel; alate part oval, both sides with sharp protrusions. Glans widest at base. Stylus acicular.
Female paratypes. Dorsal surface of body similar to male, excepting abdomen of female longer than male (Fig. 4 C–D). Tibia of pedipalps normal without dense covering of hairs below (Fig. 3 C). Seminal receptacle (Fig. 3 H), located between segments five to six of ovipositor, terminal with one ampulla.
Measurements. Holotype male (female paratype, NCHUZOOL 14845): Cephalothorax 1.5 (2.0) long, 3.2 (3.4) wide; abdomen 2.8 (5.0) long, 2.8 (3.9) wide. Total length of body 4.2 (6.9). The appendage measurements of P. nigridorsa are in Table 3.
Coloration. Dorsum black with metallic luster. Carapace black with metallic luster (Fig. 4 A–B, E). Ocularium blackish brown, with black eye rings. Coxa of all legs black. Genital operculum with distal margin pale yellow, darkening gradually to base. Sternites blackish brown. Chelicerae pale yellow, with dark brown figure above. Pedipalps dark brown, femur and patella darker. All legs black.
Distribution. Northern Taiwan (Fig. 8).
Habitat. The specimens were collected in bushes and tree trunks.
description: Published as part of Chen, Ssu-Li & Shih, Hsi-Te, 2017, Descriptions of three new species of the harvestmen genus Pseudogagrella (Opiliones: Sclerosomatidae: Gagrellinae) from Taiwan, supported by morphological and molecular evidence in Zootaxa 4268 (1), DOI: 10.11646/zootaxa.4268.1.2, http://zenodo.org/record/579879