Oribatella jacoti, Behan-Pelletier, 2011

Behan-Pelletier, V. M., 2011, Oribatella (Acari, Oribatida, Oribatellidae) of eastern North America, Zootaxa 2973 (1), pp. 1-56 : 16-20

publication ID	https://doi.org/ 10.11646/zootaxa.2973.1.1
DOI	https://doi.org/10.5281/zenodo.5286017
persistent identifier	https://treatment.plazi.org/id/AF4287B1-FF8A-FFDB-FF2B-FA68FED47D62
treatment provided by	Felipe
scientific name	Oribatella jacoti
status	sp. nov.

Treatment

Oribatella jacoti View in CoL sp. nov.

( Figs. 7 View FIGURE 7 , 8 View FIGURE 8 )

Material examined. Holotype: female, USA, Missouri, Boone Co., Hinkson Creek S Univ. Mo. Campus, 25.iv.1985 FMHD #85–128 (J. Kethley, R.A. Norton) from red and chestnut oak, sugar maple litter on ridge top ( FM) . Paratypes (all in FM if not indicated otherwise): Missouri, Boone Co., Hinkson Creek S Univ. Mo. Campus, 24.iv.1985 FMHD #85–115 (J. Kethley, R.A. Norton) 1 female from moss on base of tree; 25.iv.1985 FMHD #85– 122 (J. Kethley, R.A. Norton) 1 female from red chestnut oak litter in limestone pit; 25.iv.1985 FMHD #85–126 (J. Kethley, R.A. Norton) 1 female from wood of rotten log at base of slope; 25.iv.1985 FMHD #85–127 (J. Kethley, R.A. Norton) 1 female from mixed deciduous litter on dry ridge top; 25.iv.1985 FMHD #85–130 (J. Kethley, R.A. Norton) 2 males from floodplain litter in mixed mesophytic forest; 29.iv.1985 FMHD #85–160 (J. Kethley, R.A. Norton) 1 male from red and chestnut oak, sugar maple litter at log; 30.iv.1985 FMHD #85–166 (J. Kethley, R.A. Norton) 1 male from red cedar litter on ridge top; Lake of the Ozarks State Park , Woodland Trail, elv. 900’, 38°05’N 92°37’W, 14.v.1999 ( VBP) GoogleMaps 1 female from soil in dried up stream ( CNC) .

Other material examined: Wisconsin: Nicolet National Forest, Scott Lake Nature Trail, 45°46’N 89°W; 25.x.1998 (VBP and M. Behan) 2 from hemlock litter in 200+ year old stand, some birch; Illinois, Pope Co., Shawnee National Forest, Bell Smith Springs, 37°30’10”N 88°3’30”W, 23.ix.1992 ( VBP) 2 from lichens, moss, cedar litter on sandstone ridge above canyon; Arkansas, Scott Co., Dry Creek Wilderness Area, NE boundary at 2100’, 6.iii.1999 ( HWR) 4 from old growth; Polk Co., Bard Springs, 6.vi.1992 ( HWR) 2; Newton Co., Richland Creek Wilderness, 35°46’308”N 92°56’016”W, viii, 2002 ( HWR) 1; Canada, Ontario, Leeds-Grenville Co., nr. Otter Lake, 44°34.85’N 76°20’W, 23.vii.2003 (J. Chen, VBP, J. Johnson) 1 from rotting paper birch litter; Nova Scotia, Cape Breton Highlands National Park, Mica Mt. Trail, 7.ix.1983 ( VBP) 1 from lichen, Ledum , shrub Abies and Vaccinium litter in hollow; North Mountain Bog, 26.viii.1983 (M. Sharkey) 2.

Diagnosis. Total length of adult 576–634 µm. Integument of prodorsum, notogaster, genital and ventral plate micropunctate, mentum microtuberculate; short striae present on lenticulus and long striae on lateral of lamellae and in coxisternal region. Lamella (including cusp) about 226 µm long, cusp about 163 µm long, about 71 µm wide at level of seta le. Medial dens about 72 µm long, without teeth, lateral dens about 72 µm with 0–6 teeth on lateral margin. Bothridial setae 115–156 µm long, with barbed, fusiform head, rounded to tapered distally. Tutorium extending well anterior of rostrum, about 228 µm long of which cusp about 144 µm long, rectangular, distal margin with about 10 dens. Custodium about 62 µm long, tapered. Notogastral setae 72–86 µm long, lm posterior or posteromedial to Aa, lp anterior to A1. Setal pair h 1 closely adjacent, directed posteriorly, blunt distally; distance h 1 – h 1 about 24 µm, equidistant to distance p 1 –p 1. Epimeral seta 3c 75 µm, thickest and longest seta, subequal in shape to other epimeral setae. Mentum with transverse carina anteriorly; with tectum. Seta l” of genu I about 53 µm, l” of genu II about 62 µm. Tarsi heterotridactylous.

Description. Adult. Dimensions: Mean total length: female (n = 4) 631 µm (range 624–634); male (n = 4) 588 µm (range 576–595). Mean notogastral width: female (n =2) 471 µm (461, 480); male (n =3) 439 µm (range 432– 442).

Integument: Prodorsum, notogaster, genital and ventral plate micropunctate, mentum microtuberculate; short striae present on lenticulus and long striae on lateral of lamellae ( Fig. 7 View FIGURE 7 ) and in coxisternal region.

Prodorsum: Rostral margin rounded to undulating with minute dens laterally (as in Fig. 2F View FIGURE 2 ). Lamella (including cusp) about 226 µm long, cusp about 163 µm long, about 71 µm wide at level of seta le. Lamellar cusps contiguous, or not, anteromedially, separated posteromedially, leaving prodorsum visible through oval opening, about 62 µm long by up to 24 µm wide. Medial dens about 72 µm long without teeth; lateral dens about 72 µm with 0–6 teeth ( Fig. 7 View FIGURE 7 ) on lateral margin, varying among specimens and on either side of same specimen. Translamella without tooth, about 19 µm at greatest width, about 19 µm deep ( Fig. 7 View FIGURE 7 ). Setae ro about 120 µm long, strongly barbed along length, acuminate, strongly directly medially. Setae le about 96 µm long, thick, heavily barbed, tapered. Setae in about 211 µm long, thick (less so than le), heavily barbed, tapered; mutual distance of pair about 72 µm. Bothridial setae 115–156 µm long, with barbed, fusiform head, rounded to tapered distally, stalk short, smooth; head directed slightly anteromedially. Exobothridial setae thin, smooth, about 60 µm.

Lateral aspect of podosoma: Genal tooth broad, subrectangular, rounded distally, without dens ventrodistally, with longitudinal ridge ventrally (as for Fig. 2E View FIGURE 2 ). Tutorium extending well anterior of rostrum; about 228 µm long, of which cusp about 144 µm long, rectangular, distal margin with about 10 dens. Custodium about 62 µm long, tapered ( Fig. 8 View FIGURE 8 ). Porose area Al about 21 µm in diameter.

Notogaster: Length subequal to width. Anterior margin undulating, convex lateral of bothridium, with 10–12 transverse ridges ( Fig. 7 View FIGURE 7 ). Pteromorph with ridges at anterior and ventral margins ( Fig. 7 View FIGURE 7 ); with or without small dens on anteroventral margin ( Fig. 8 View FIGURE 8 ). Porose areas large, about 17 µm in diameter, clearly defined. Ten pairs of long, barbed, tapered (other than seta h 1), notogastral setae present, 72–86 µm long, with c, la and h setae longest; lm posterior to posteromedial of Aa, and directed laterally, lp anterior of A1. Setae h 1 closely adjacent, directed posteriorly, blunt distally ( Fig. 7 View FIGURE 7 ); distance h 1 –h 1 about 24 µm, subequal to distance p 1 –p 1. Lenticulus U-shaped, with fine short striae ( Fig. 7 View FIGURE 7 ).

Ventral region: Epimeral setae mostly 24–36 µm long, setal length (in µm) approximate, 1b 36, 2a 24, 3a, 24, 4a 24; 3c 75, thickest and longest seta and more barbed than 4c 72, which subequal in shape to other epimeral setae, though more barbed. Genital, aggenital, anal and adanal setae smooth, about 10–14 µm long. Genital setae about 10 µm, positioned 1+5, with 1 seta on anterior margin of plate. Postanal porose area oval, 25 x 12 µm.

Gnathosoma: Mentum with transverse carina anteriorly; with tectum ( Fig. 8 View FIGURE 8 , as for Fig. 2D View FIGURE 2 ). Axillary saccule about 8x3 µm.

Legs: Setation (I to IV): trochanters, 1-1-2-1; femora, 5-5-3-2; genua, 3(1)-3(1)-1(1)-2; tibiae 4(2)-4(1)-3(1)- 3(1); tarsi, 20(2)-15(2)-15-12. Setae l” of genu I about 53 µm, l” of genu II about 62 µm. Tarsi heterotridactylous.

Etymology. This species is named in honour of A. P. Jacot, (1890–1939), the world-renowned acarologist, who was and is seminal to our knowledge of North American Oribatida . A short biographical overview of his life is given in Metz et al. (1977).

Remarks. This species is similar in size and shape to O. brevicornuta from which it is easily distinguished by the closely adjacent, posteriorly directed setae h 1, and the distance h 1 – h 1 being subequal to the distance p 1 –p 1, about 24 µm.

Distribution and Ecology. This species is widely distributed throughout eastern North America, from Nova Scotia to Arkansas.