Bisetocreagris cheni, Ying, Jia, Yong-Wei, Zhao & Ming-Sheng, Zhu, 2010

Ying, Jia, Yong-Wei, Zhao & Ming-Sheng, Zhu, 2010, A new species of the pseudoscorpion genus Bisetocreagris from China (Arachnida: Pseudoscorpiones: Neobisiidae), Zootaxa 2340, pp. 65-68 : 65-68

publication ID

https://doi.org/ 10.5281/zenodo.205264

DOI

https://doi.org/10.5281/zenodo.6196482

persistent identifier

https://treatment.plazi.org/id/484687A0-FF9A-FFB0-FF3E-F108683EFE70

treatment provided by

Plazi

scientific name

Bisetocreagris cheni
status

sp. nov.

Bisetocreagris cheni View in CoL sp. n.

( Figs. 1–13 View FIGURES 1 – 3 View FIGURES 4 – 13 )

Type material. Male holotype: (Museum ID # Ar.-MHBU-ZJ 070804), China, Zhejiang Province, Tonglu County, Mt Tongjun, 29°48'43ʺN 119°40'54ʺE, CHEN Zhang-Fu leg., 5 April 1987.

Etymology. The specific name is a patronym in honour of Prof. CHEN Zhang-Fu who collected and donated the specimen.

Diagnosis. The new species is very similar to Bisetocreagris silvestrii , but can be distinguished from the latter by its larger size—e.g. in B. cheni the chela (with pedicel) is 2.15 mm long, whereas in B. silvestrii it is 1.86 mm; the length of palpal movable finger is 1.07 times longer than that of the hand (without pedicel) in the new species, as opposed to 0.92 in B. silvestrii (Harvey, 1999) —and the divided galea of the male (undivided in B. silvestrii ).

Description (holotype male). Colour mostly reddish brown, pedipalps and carapace slightly darker. Carapace slightly longer than broad, smooth and slightly contracted posteriorly; four distinct eyes with flattened lenses; 36 setae in total, of which 4 are at anterior and 12 at posterior margin, 3 ocular setae on each side, median and intermedian rows with 7 each; epistome small, rounded ( Figs. 1, 2 View FIGURES 1 – 3 ). Tergites and sternites with uniseriate setation; tergal chaetotaxy (I–X): 15: 16: 16: 17: 18: 17: 16: 17: 12:10; sternal chaetotaxy (IV–XI): 21: 20: 20: 18: 18: 14: 8. Male genital area ( Fig. 3 View FIGURES 1 – 3 ): sternite II with a median and posterior group of 26 scattered setae; sternite III with an anteromedian bisetose groove and a median group of 19 scattered setae ( Fig. 3 View FIGURES 1 – 3 ). Pleural membrane granulostriate.

Chelicera. Palm with 7 setae, movable finger with 1 sub-medial seta; with 1 lyrifissures on the dorsal face of palm; fixed finger with 6 teeth; movable finger with 8 teeth ( Fig. 12 View FIGURES 4 – 13 ). Rallum composed of 7 blades, all blades with anteriorlydirected spinules, basalmost blade obviously shorter than others ( Fig. 11 View FIGURES 4 – 13 ); galea medium-sized, with major bifurcation about half way, each tine distally four-furcated ( Fig. 10 View FIGURES 4 – 13 ).

Pedipalps. Apex of coxa rounded, with 5 setae. Femur, patella and chela smooth. Fixed chelal finger with 8 trichobothria and a pseudo-tactile seta (pts) at the base of the fixed chelal finger ( Fig. 6 View FIGURES 4 – 13 ), movable chelal finger with 4 trichobothria: eb and esb situated on lateral margin of hand; ist situated near ib; st slightly closer to t than to sb ( Fig. 5 View FIGURES 4 – 13 ). Both chelal fingers bear blunt and contiguous teeth, fixed finger with 61 and movable finger with ca. 68 ( Figs. 7, 8 View FIGURES 4 – 13 ), venom duct very short in the tip of fixed finger, nodus ramosus lying about opposite second tooth.

Legs. Junction between femur and patella IV perpendicular; tactile setae distributed as follows: tibia IV with 1 medial seta, TS ratio(Tactile seta ratio) is 0.49, basitarsus IV with 1 sub-proximal seta, TS ratio is 0.23, and telotarsus IV with 1 medial seta in the middle of the podomere, TS ratio is 0.4; subterminal seta forked; arolium smooth, and slightly shorter than claws.

Measurements (length/width in mm, ratios in parentheses). Body length 4.4. Carapace 1.22/1.06 (1.15). Chelicera 0.83/0.43(1.93), movable finger 0.59. Palp femur 1.32/0.46 (2.87), patella 1.19/0.59 (2.02), chela 2.15/0.83 (2.59 with pedicel), palm length 0.99, movable finger length 1.06, the ratio of movable finger/hand (without pedicel) 1.07. Leg IV femur 0.63/0.46 (1.37), patella 0.76/0.46 (1.65), femur + patella IV 1.39/0.46 (3.0), tibia 1.16/0.23 (5.04), basitarsus 0.43/0.17 (2.53), telotarsus 0.53/0.13 (4.08).

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