Two zoogeographically remarkable mite species from Finland (Acari, Oribatida, Oribotritiidae) Author Niedbała, Wojciech Author Penttinen, Ritva text Journal of Natural History 2006 2006-05-31 40 5 - 6 265 272 http://dx.doi.org/10.1080/00222930600621494 journal article 10.1080/00222930600621494 1464-5262 4581367 Maerkelotritia cryptopa ( Banks, 1904 ) ( Figures 1–19 ) Measurements of one specimen (in micrometres) Prodorsum: length 429, width 338, height 172, sensillus 88.5; setae: interlamellar 253, lamellar 177, rostral 121, exobothridial 91.1; notogaster: length 737, width and height 535, Figures 1–7. Maerkelotritia cryptopa ( Banks, 1904 ) . (1) Dorsolateral view. (2) Dorsal view. (3) Sensillus, dorsal view. (4) Surface of notogaster. (5) Palpus. (6) Ventral side. (7) Anal and adanal plates. Figures 8–19. Maerkelotritia cryptopa ( Banks, 1904 ) . (8–14) Specimen 1 from Finland: (8) prodorsum, dorsal view; (9) prodorsum, lateral view; (10) notogaster; (11) seta c 1 ; (12) mentum of infracapitulum; (13) genital, aggenital, anal, and adanal plates; (14) trochanter and femur of leg I. (15) Specimen 2: genital and aggenital plates. (16) Specimen 3: ventral region. (17) Specimen 4: right side of ventral region. (18) Specimen 5: right side of anal and adanal plates. (19) Specimen 6: right side of anal and adanal plates. setae: c 1 106, h 1 and ps 1 147, genital and aggenital plates 222X106, anal and adanal plates 353X85.8. Diagnosis Prodorsum with setae erect, interlamellar and lamellar setae rigid covered with small spines; rostral setae with flagellate distal tip, rough. Notogaster with rather short ( c 1 , c 1 – d 1 ), rigid setae covered sparsely with small spines. Genital plates with 6–10 pairs of setae; anal plates with one, two, or three pairs of setae; adanal plates with four pairs of fairly long setae. Chaetome of legs variable (Table II). Remarks The specimens from Finland have slightly shorter notogastral setae, wider distance between setae ad 2 – ad 3 than between ad 1 – ad 2 or ad 3 – ad 4 , and highly varied number of anal setae. The species is also characterized by variability in the chaetotaxy of genital setae and chaetome of the setae of the legs ( Tables I , II). Number of genital setae is six, eight, nine, or 10. Number of anal setae is one, two, or three pairs; mostly a long an 1 in the posterior part of the plate and a short an 3 in its anterior part. Two specimens also have a seta an 2 in the middle part of the plate and one specimen has only seta an 3 . Leg chaetome is variable in setae of femora: I (3 or 4), II (3 or 4), III (2 or 3), IV (2 or 3), and genua IV (2 or 3). Comparison Despite the large variation in the number of genital setae, especially anal setae, this species is distinguishable from the similar Maerkelotritia kishidai ( Aoki, 1958 ) by the permanent presence of a short anal setae ( an 3 ) in the anterior part of each anal plate. Maerkelotritia kishidai always has one pair of anal setae an 2 in the middle part of the anal plates. Table I. Numbers of setae on left and right sides of the genital and anal plates of seven specimens of Maerkelotritia cryptopa ( Banks, 1904 ) .
Setae of right Setae of left
Specimen genital plate genital plate Setae of right anal plate Setae of left anal plate
Specimen 1 6 6 – – an3 – – an3
Specimen 2 8 8 an1 an2 an3 an1 – an3
Specimen 3 9 9 an1 – an3 an1 – an3
Specimen 4 9 10 an1 – an3 an39 an1 – an3
Specimen 5 9 9 an1 an2 an3 an1 an2 an3
Specimen 6 9 9 an1 – an3 an1 – an3
Specimen 7 8 10 an1 – an3 an1 – an3
Table II. Chaetome of legs (without tarsi) of Maerkelotritia cryptopa ( Banks, 1904 ) .
Specimens Leg I Leg II Leg III Leg IV
Specimen 1 1-3-4(2)-5(1) 1-3-4(1)-5(1) 3-2-3(1)-2(1) 3-2-2(1)-2(1)
Specimen 2 1-4-4(2)-5(1) 1-4-4(1)-5(1) 3-3-3(1)-2(1) 3-3-3(1)-2(1)
Specimen 3 1-4-4(2)-5(1) 1-4-4(1)-5(1) 3-3-3(1)-2(1) 3-2-2(1)-2(1)
Specimen 4 1-4-4(2)-5(1) 1-4-4(1)-5(1) 3-3-3(1)-2(1) 3-3-2(1)-2(1)
Specimen 7 1-4-4(2)-5(1) 1-4-4(1)-5(1) 3-2-3(1)-2(1) 3-2-2(1)-2(1)
Locality Finland , Hamina , litter of grass, reeds etc. on seashore, 20 June 2004 , leg. V . Huhta; seven exx . Distribution Holarctic. Austrotritia finlandica sp. nov. ( Figures 20–30 ) Description Measurements of holotype : prodorsum: length 500, width 353, height 333, sensillus 70.8, setae: interlamellar 35.4, lamellar 98.7, rostral 75.9, exobothridial 75.4; notogaster: length 939, width 667, height 687, setae: c 1 157, h 1 and ps 1 30.4, genitoaggenital plate 252X70.7, anal and adanal plates 394X50.5. Sexual dimorphism morphologically not apparent. Large species. Colour brown. Surface of body finely punctate. Prodorsum with two pairs of lateral carinae. Sensilli short, rigid, rough. Interlamellar setae short, curved distally, other setae longer, le . ro . ex . in . Notogaster with very fine, short setae, posterior setae shorter than anterior. Setae c 1–3 remote from anterior border, setae c 1 more than other. One pair of lateral opisthosomal glands on each side, lyrifissures and vestigial setae in normal position. Ventral region. Setae h of mentum longer than distance between them. Palps fivesegmented with chaetome: 0-3-0-2-9(1). Genitoaggenital plates with two transversal furrows. Nine pairs of genital setae, two pairs anteriorly of first furrow, two pairs anteriorly of second furrow, and five pairs posteriorly of second row. Two pairs of aggenital setae present. Anal plates with one pair of setae. Adanal plates with three pairs of setae; lyrifissures iad are located laterally between setae ad 2 and ad 3 . Legs. Formulae of setae and solenidia (without tarsi): I: 1-4-5(2)-5(1); II: 1-4-4(1)-4(1); III: 3-2-3(1)-3(1); IV: 3-2-2(1)-3(1). Tarsi heterotridactylous. Types Holotype and two paratypes : Finland , Korppoo Aspö Ormskär , heap of reeds and kelp, 1 August 1985 , leg. P. T . Lehtinen . Holotype and one paratype : (ACA. ORI . PAL .0.094) in the Zoological Museum of Turku. One paratype : in the Department of Animal Taxonomy and Ecology , Adam Mickiewicz University , Poznań . Localities in Finland Korppoo Vidskär, shore meadow with Filipendula υulgaris , Rubus idaeus , Alnus , 13 May to 29 June 1993 , leg. S. Koponen, one ex; Korppoo Aspö Ormskär, within stump of decaying alder, 1 August 1984 , leg. P. T. Lehtinen, one ex; Korppoo Brunskär Stor-Hästö, litter of Viburnum opulus , 30 June 1985 , leg. P. T. Lehtinen, six exx; Korppoo Brunskär Stor-Hästö, litter of Fraxinus and Populus , 30 June 1985 , leg. P. T. Lehtinen, four exx; Korppoo Åvensor Hevoslot, nests of Lasius sp. and Formica sanguinea , 12 June 1983 , leg. P. T. Lehtinen, one ex. Figures 20–23. Austrotritia finlandica sp. n. (20) Dorsoventral view. (21) Dorsal view of prodorsum. (22) Genitoaggenital plates. (23) Ventrolateral view of anoadanal region. Figures 24–30. Austrotritia finlandica sp. n. (24) Prodorsum, dorsal view. (25) Prodorsum, lateral view. (26) Notogaster. (27) Mentum of infracapitulum. (28) Right side of ventral region. (29) Palpus. (30) Trochanter and femur of leg I. Comparison The new species is most similar to the Oriental Austrotritia saraburensis Aoki, 1965 but can be distinguished by a different shape of sensilli, by different proportion of lengths of prodorsal and notogastral setae, the different arrangement of setae c 1–3 , the similar lengths of setae c 3 to other setae of row c , by the arrangement of genital setae, and the presence of three pairs of setae on femora of palps. Distribution Palaearctic, endemic.