Plonaphacarus concavus Liu, Wu & Chen, 2011, sp. nov.
Creators: name: Liu, Dong
name: Wu, Donghui
name: Chen, Jun
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Sarcoptiformes
Phthiracaridae
Plonaphacarus
Plonaphacarus concavus

description: Plonaphacarus concavus sp. nov.
(Figs. 10–18)
Material examined. Holotype: adult (in alcohol, W-89-117), China: Hubei Province, Lichuan City (30°17'27.59"N, 108°56'10.95"E), Maoba, Xingdoushan Mt., from litter, 850M, 24 Jul., 1989, leg. Yun-Qi Cui.
Etymology. The new specific name “ concavus ” is from Latin, and refers to the concave anterodorsal part of notogaster.
Measurements: Holotype: Prodorsum: length 319, width 205, height 150, setae: ss 151, ro 30, in 25, le 27, ex 10, distance between setae: ro -ro 45, in -in 70, le -le 132; notogaster: length 710, width 420, height 390; setae: c1 150, c2 30, c3 24, c p 20, d1 35, d2 25, e1 25, e2 20, h1 25, h2 20, h3 20, ps1 40, ps2 25, ps3 25, ps4 15; distance between setae: c1-d1 242, d1-e1 205, e1-h1 190, h1-ps1 125; ventral region: an1 70, an2 70; genitoaggenital plate 148×145, anoadanal plate 195×140.
Colour grey-yellowish. Surface of body reticulate.
Prodorsum with one pair of strong dorsal carinae; lateral carinae moderately long, reaching sinus; dorsal and lateral region weakly visible; posterior furrows present; sensilli long, rough and setiform; other setae short, rough and spiniform, except exobothridial setae short and fine; interlamellar and lamellar setae semi-erect, rostral setae procumbent; comparative length: ss>ro>le> in>ex.
In lateral view, anterodorsal part of notogaster protrudent to form hook-like projection covering posterior part of prodorsum; frontal part of notogaster concave in dorsal view; 15 pairs of notogastral setae present, short, rough and spiniform, except setae c1 much longer and robust; setae c1-3 remote from anterior border, setae c2 more so than c1 and c3; vestigial setae f1 positioned anterior to setae h1; lyrifissures not observed.
Nine pairs of genital setae present, arranged in two rows with formula: 6(4+2): 3; one pair of aggenital setae present; three pairs adanal setae short, rough and spiniform; two pairs of long and robust anal setae present.
Setae h of mentum longer than distance between them; chaetotaxy of legs (without tarsi): I: 1-4-2(2)-5(1); II: 1-3-2(1)-3(1), III: 2-2-1(1)-2(1), IV: 2-1-1-2(1); v’’ / v’ (formora I)=3.75; setae d on femora I situated near distal end of article; setae a’’ on tarsi II curved distally; setae a’’ on tarsi I and setae ft’’ on tarsi II straight distally; setae s and pv’ on tarsi IV present; setae s on tarsi I absent and on tarsi II present; setae l’ on genua IV reduced; setae d on tibiae IV long, independent of solenidions; all legs monodactylous.
Distribution. Known only from type locality.
Remark. This new species is easily distinguished from other species of this genus by the combination of following characters: prodorsum with one pair of strong dorsal carinae; rostral setae procumbent; in lateral view, anterodorsal part of notogaster protrudent to form hook-like projection covering posterior part of prodorsum; frontal part of notogaster concave in dorsal view; 15 pairs of notogastral setae present, short, rough and spiniform, except setae c1 much longer and robust.
description: Published as part of Liu, Dong, Wu, Donghui & Chen, Jun, 2011, Review of Plonaphacarus (Acari: Oribatida: Steganacaridae), with descriptions of eight new species from China, pp. 1-26 in Zootaxa 2739 on page 8, DOI: 10.5281/zenodo.201395