Torrenticola oregonensis Fisher & Dowling

Fisher, J. Ray, Fisher, Danielle M., Skvarla, Michael J., Nelson, Whitney A. & Dowling, Ashley P. G., 2017, Revision of torrent mites (Parasitengona, Torrenticolidae, Torrenticola) of the United States and Canada: 90 descriptions, molecular phylogenetics, and a key to species, ZooKeys 701, pp. 1-496 : 1

Torrenticola oregonensis Fisher & Dowling sp. n.

Material examined.

HOLOTYPE (♀): from USA, Oregon, Grant County, Prairie City; Strawberry Forest Camp, (44°19'19"N, 118°40'40"W), 17 June 1976, by IM Smith, IMS760126.

PARATYPES (3 ♀; 3 ♂): Oregon, USA: 1 ♂ (ALLOTYPE) from Grant County, Prairie City; Strawberry Forest Camp, (44°19'19"N, 118°40'40"W), 17 June 1976, by IM Smith, IMS760126 • 1 ♀ from Benton County, Philomath; Marys Peak Campground, (44°30'30"N, 123°33'33"W), 23 June 1976, by IM Smith, IMS760147 • 2 ♂ from Benton County, Philomath; Marys Peak Campground, (44°30'30"N, 123°33'33"W), 27 June 1983, by IM Smith & AB Smith, IMS830006 • 1 ♀ from Benton County, Philomath; Marys Peak Campground, (44°30'30"N, 123°33'33"W), 28 June 1983, by IM Smith, IMS830008 • 1 ♀ from Grant County, Prairie City; beside Rt. 26 just east of Dixie Pass, (44°32'32"N, 118°32'32"W), 17 June 1976, by IM Smith, IMS760125.

Type deposition.

Holotype (♀), allotype (♂), and some paratypes (2 ♀; 1 ♂) deposited in the CNC; other paratypes (1 ♀; 1 ♂) deposited in the ACUA.

Diagnosis.

Torrenticola oregonensis are similar to the other member of Tahoei group, T. tahoei by subcapitulum shape, having purple coloration restricted posteriorly and being distributed in the west and to members of the Nigroalba Group ( T. flangipalpa , T. nigroalba , T. solisorta , and T. dentirostra ) in having purple dorsal coloration restricted posteriorly. T. oregonensis can be differentiated from the Nigroalba Group by being larger (dorsum length ♀ = 760-840 in T. oregonensis , 475-565 in Nigroalba Group; ♂ = 690-820 in T. oregonensis , 425-510 in Nigroalba Group) and distributed in Oregon (Nigroalba Group are eastern). T. oregonensis can be differentiated from T. tahoei by being larger (dorsum length ♀ = 760-840 in T. oregonensis , 600-720 in T. tahoei ; ♂ = 690-820 in T. oregonensis , 560-650 in T. tahoei ; dorsum width ♀ = 560-640 in T. oregonensis , 430-515 in T. tahoei ; ♂ = 520-605 in T. oregonensis , 400-460 in T. tahoei ) and a less elongate subcapitulum (ventral length/width = 2.63-2.74 in T. oregonensis , 3.25-4.11 in T. tahoei ).

Description.

Female (Figure 179) (n = 4) (holotype measurements in parentheses when available) with characters of the genus with following specifications.

Dorsum - (760-840 (760) long; 560-640 (560) wide) ovoid with faint pink coloration medially, occasionally continuing posteriorly. Anterio-medial platelets (145-163.75 (145) long; 72.5-87.5 (72.5) wide). Anterio-lateral platelets (222.5-247.5 (222.5) long; 97.5-102.5 (100) wide) free from dorsal plate. Dgl-4 much closer to the edge of the dorsum than to the muscle scars (distance between Dgl-4 435-495 (435)). Dorsal plate proportions: dorsum length/width 1.30-1.36 (1.36); dorsal width/distance between Dgl-4 1.27-1.29 (1.29); anterio-medial platelet length/width 1.85-2.21 (2.00); anterio-lateral platelet length/width 2.23-2.45 (2.23); anterio-lateral/anterio-medial length 1.48-1.56 (1.53).

Gnathosoma - Subcapitulum (380-415 (380) long (ventral); 280-307.5 (280) long (dorsal); 140-157.5 (140) tall) colorless. Rostrum (152.5-170 (152.5) long; 60-65 (60) wide). Chelicerae (380-425 (380) long) with curved fangs (70-75 (70) long). Subcapitular proportions: ventral length/height 2.63-2.71 (2.71); rostrum length/width 2.48-2.62 (2.54). Pedipalps with tuberculate ventral extensions on femora and tuberculate extensions on genua that are slightly dentate. Palpomeres: trochanter (42.5-46.25 (42.5) long); femur (115-133.75 (115) long); genu (83.75-95 (83.75) long); tibia (100-110 (100) long; 25-27.5 (25) wide); tarsus (16.25-17.5 (17.5) long). Palpomere proportions: femur/genu 1.37-1.43 (1.37); tibia/femur 0.78-0.87 (0.87); tibia length/width 3.81-4.00 (4.00).

Venter - (900-990 (900) long; 660-750 (660) wide) colorless. Gnathosomal bay (170-185 (170) long; 75-100 (75) wide). Cxgl-4 subapical. Medial suture (60-80 (60) long). Genital plates (210-230 (210) long; 185-205 (185) wide). Additional measurements: Cx-1 (330-370 (330) long (total); 162.5-190 (170) long (medial)); Cx-3 (410-470 (410) wide); anterior venter (230-270 (230) long). Ventral proportions: gnathosomal bay length/width 1.80-2.27 (2.27); anterior venter/genital field length 1.04-1.22 (1.10); anterior venter length/genital field width 1.24-1.32 (1.24); anterior venter/medial suture 3.00-3.83 (3.83).

Male (Figure 180) (n = 3) (allotypic measurements in parentheses when available) with characters of the genus with following specifications.

Dorsum - (690-820 (820) long; 520-605 (605) wide) ovoid with faint pink coloration medially, occasionally continuing posteriorly. Anterio-medial platelets (140-155 (150) long; 67.5-82.5 (82.5) wide). Anterio-lateral platelets (215-247.5 (247.5) long; 87.5-102.5 (102.5) wide) free from dorsal plate. Dgl-4 much closer to the edge of the dorsum than to the muscle scars (distance between Dgl-4 420-480 (480)). Dorsal plate proportions: dorsum length/width 1.33-1.36 (1.36); dorsal width/distance between Dgl-4 1.24-1.26 (1.26); anterio-medial platelet length/width 1.82-2.30 (1.82); anterio-lateral platelet length/width 2.25-2.46 (2.41); anterio-lateral/anterio-medial length 1.45-1.65 (1.65).

Gnathosoma - Subcapitulum (370-380 (380) long (ventral); 275-290 (290) long (dorsal); 135-140 (140) tall) colorless. Rostrum (145-150 (150) long; 52.5-60 (60) wide). Chelicerae (375-395 (395) long) with curved fangs (65-70 (70) long). Subcapitular proportions: ventral length/height 2.64-2.74 (2.71); rostrum length/width 2.50-2.76 (2.50). Pedipalps with tuberculate ventral extensions on femora and tuberculate extensions on genua that are slightly dentate. Palpomeres: trochanter (40-43.75 (43.75) long); femur (115-127.5 (127.5) long); genu (82.5-87.5 (87.5) long); tibia (97.5-102.5 (102.5) long; 25-26.25 (26.25) wide); tarsus (15-16.25 (15) long). Palpomere proportions: femur/genu 1.31-1.46 (1.46); tibia/femur 0.80-0.85 (0.80); tibia length/width 3.90-3.90 (3.90).

Venter - (840-930 (930) long; 610-710 (710) wide) colorless. Gnathosomal bay (157.5-172.5 (157.5) long; 70-100 (100) wide). Cxgl-4 subapical. Medial suture (100-120 (120) long). Genital plates (165-175 (175) long; 130-140 (140) wide). Additional measurements: Cx-1 (330-340 (340) long (total); 160-180 (180) long (medial)); Cx-3 (390-455 (455) wide); anterior venter (275-325 (325) long). Ventral proportions: gnathosomal bay length/width 1.58-2.46 (1.58); anterior venter/genital field length 1.65-1.86 (1.86); anterior venter length/genital field width 2.11-2.32 (2.32); anterior venter/medial suture 2.71-2.75 (2.71).

Immatures unknown.

Etymology.

Specific epithet ( oregonensis ) refers to the distribution of this species, which was paradoxically found in several ecoregions across Oregon, but not in surrounding areas.

Distribution.

Oregon (Figure 178).

Remarks.

Unfortunately, we were unable to acquire fresh material of Torrenticola oregonensis and therefore this species is not included in our phylogenetic analyses. However, we were able to examine morphology with material preserved in GAW. Due to its unique set of characteristics, we are unable to place this species into a species group or complex.