Ameroseius norvegicus Narita, Abduch & Moraes

Narita, João Paulo Z., Abduch, William Y., De Moraes, Gilberto J. & Klingen, Ingeborg, 2015, Description of a new species of Ameroseius Berlese (Acari: Ameroseiidae) from Norway, with a key to related species, Zootaxa 4034 (2), pp. 390-398: 391-394

publication ID

http://dx.doi.org/10.11646/zootaxa.4034.2.10

publication LSID

lsid:zoobank.org:pub:1E7728E7-C364-47C6-9849-710FC65BD22D

persistent identifier

http://treatment.plazi.org/id/03B687E5-E439-FF9B-06EB-C4DB9513FF71

treatment provided by

Plazi

scientific name

Ameroseius norvegicus Narita, Abduch & Moraes
status

n. sp.

Ameroseius norvegicus Narita, Abduch & Moraes   n. sp.

Diagnosis. Anterior margin of epistome acuminate and smooth. Corniculi bifid. Dorsal shield ornamented with ridges and pit-like depressions over most of its surface; reticulated centrally between left and right j -J and Z 5 setae as well as slightly laterad of that region behind J 2; with 29 pairs of setae, at least as long as distance to subsequent setae of the same series, except for j 3, z 5, z 6 and Z 3; seta j 1 flat, broad and serrate, other dorsal idiosomal setae stout and weakly serrate. Setae st 3 on separate platelets. Opisthogaster with five pairs of setae, all on soft cuticle, in addition to circumanal setae.

Adult female ( Figs. 1–10 View FIGURES 1 – 8 View FIGURES 9 – 16 ) (4 specimens measured)

Gnathosoma: Cheliceral shaft length (from base of first segment to apex of fixed cheliceral digit) 98 (97–100) long; dorsal and lateral lyrifissures distinct; dorsal seta indistinct; fixed cheliceral digit 23 (22–24) long, with three large teeth along the internal edge and a minute subapical tooth, in addition to apical tooth; movable cheliceral digit 24 (23–25) long, only with apical tooth; internal surface with a wavy longitudinal line that is more easily discernible near level of the large teeth of fixed digit; the line apparently corresponds to the limit between the thicker ventral and the thinner dorsal regions of the digit ( Fig. 1 View FIGURES 1 – 8 ). Anterior margin of epistome acuminate, smooth, with a row of denticles parallel to the margin ( Fig. 2 View FIGURES 1 – 8 ). Corniculi bifid. Deutosternum relatively broad, 6.5 (6–7) wide at median level; with eight transverse lines, of which the most distal and the two most proximal lines smooth; other lines with 1-2 denticles each; with a pair of diagonal rows of denticles behind sc, converging posteriorly to merge with the lateral margins of deutosternum ( Fig. 3 View FIGURES 1 – 8 ). Hypostomal and subcoxal setae aciculate; their length: h 1 18 (17-20), h 2 22 (20-25), h 3 21 (19-23), sc 26 (24-28). Palpus 94 (93–96) long; numbers of setae from trochanter to tibia: 2, 5, 6, 14. Palp apotele trifid.

Dorsal idiosoma: Dorsal shield entire ( Fig. 4 View FIGURES 1 – 8 ), ornamented with ridges and pit-like depressions over most of its surface; reticulated centrally between right and left j -J and Z 5 setae as well as slightly laterad of that region, behind J 2 ( Fig. 5 View FIGURES 1 – 8 ); with a row of teeth along anterior margin, between j 1 and s 1; 500 (468–513) long and 332 (312– 357) wide at level of s 6; apparently with three pairs of pores (laterad of z 6, anterolaterad of Z 3 and anteromediad of S 5). Podonotal region of dorsal shield bearing 19 pairs of setae (j 1 –j 6, z 2, z 4 –z 6, s 1, s 2, s 4 –s 6, r 2 –r 5); opisthonotal region of dorsal shield bearing ten pairs of setae (J 2, J 4, Z 1 –Z 3, Z 5, S 2 –S 5). Lengths of dorsal

setae: j 1 33 (28–35), j 2 39 (36–42), j 3 49 (47–52), j 4 62 (58–65), j 5 93 (89–96), j 6 100 (98–105), J 2 101 (97–104), J 4 113 (108–115), z 2 55 (50–60), z 4 58 (56–62), z 5 38 (36–41), z 6 36 (34–37), Z 1 50 (47–55), Z 2 55 (54–57), Z 3 40 (37–43), Z 5 117 (115–121), s 1 53 (49–56), s 2 59 (56–63), s 4 70 (67–74), s 5 70 (67–76), s 6 68 (60–73), S 2 71 (66–73), S 3 99 (95–104), S 4 97 (95–99), S 5 115 (112–117), r 2 73 (67–75), r 3 60 (58–64), r 4 50 (47–54), r 5 53 (49–56). Dorsal shield setae at least as long as distance to subsequent setae of the same series, except for j 3, z 5, z 6 and Z 3; seta j 1 flat, broad and serrate ( Fig. 6 View FIGURES 1 – 8 ); other dorsal idiosomal setae stout and weakly serrate ( Fig. 7 View FIGURES 1 – 8 ).

Ventral idiosoma ( Fig. 8 View FIGURES 1 – 8 ): Base of tritosternum 12 (11–13) long and 10 (10–13) wide, laciniae fused for about 40 % of their total length [58 (57–60)]. Sternal shield reticulate with simple lines, 80 (76–83) long at midline and 115 (112–120) wide at the widest level, with lateral projections between coxae I and II, bearing st 1 and st 2 as well as two pairs of lyrifissures. Seta st 3 on separate platelets. Seta st 4 and lyrifissure iv 3 on unsclerotised cuticle. Genital shield reticulate with simple lines, 128 (123–133) long including hyaline anterior flap, bearing st 5; width at base of hyaline flap 63 (61–66), at level of st 5 68 (66–70); posterior margin rounded. With a pair of pores (gv 2, according to interpretation of Narita et al. 2013 a) on unsclerotised cuticle laterad of st 5 and a pair of lyrifissures (iv 5) posteromesad of gv 2. One pair of metapodal plates of variable shape (usually ellipsoidal). Anal shield oval, with longer axis transverse, about 110 (100–120) long and 169 (160–175) wide, bearing only circumanal setae; anal opening 36 (35–37 including frame) long. Unsclerotised cuticle around anal shield with five pairs of setae (Jv 1 –Jv 3, Jv 5, Zv 2) and five pairs of lyrifissures (posterolaterad of Jv 1, laterad of Jv 3, anterolaterad of Jv 5, posterolaterad of Jv 5 and posterior to metapodal plates). Lengths of ventral setae: st 1 33 (30-40), st 2 32 (30-36), st 3 38 (35-40), st 4 26 (25-27), st 5 22 (20-24), Jv 1 19 (18-22), Jv 2 16 (15-17), Jv 3 18 (16-21), Jv 5 24 (23-27), Zv 2 16 (14-20), para-anal 24 (23-25), post-anal 24 (23-25). Endopodal plate fragmented, fused to sternal shield between coxae I and II, a boomerang-shaped platelet between coxae II and III and a subtriangular platelet between coxae III and IV. Exopodal plate represented by a remnant triangular platelet between coxae I and II.

Peritreme and peritrematic shield: Peritreme reaching level of j 1, not visible dorsally. Peritrematic shield broad; fused with dorsal shield at level of j 2; with a large pore at level of coxa III (gd 3 of Athias-Henriot, 1975; gp 2 of Lindquist & Moraza, 2009), with a lyrifissure behind stigma.

Spermathecal apparatus ( Fig. 9 View FIGURES 9 – 16 ): Induction pore not discernible; tubuli reaching sacculus separately but close to each other; each with an enlargement before sacculus, apparently the ramus ( Evans, 1992), called intermediate piece (pièce intermediaire) by Elsen (1973).

Legs: Pretarsi of legs I –IV consisting of an elongate stalk, a pair of claws and pulvillus with three rounded lobes ( Fig. 10 View FIGURES 9 – 16 ). Lengths of legs: I— 449 (415–480); II— 356 (350–365); III— 359 (340–385); IV— 446 (415–465). Chaetotaxy of legs I –IV: coxae: 2, 2, 2, 1; trochanters: 6, 5, 5, 5; femora: 12 (2 3 / 1 2 / 2 2), 10 (2 2 / 1 2 / 2 1), 6 (2 2 /0 1 /0 1), 5 (1 2 /0 1 /0 1); genua: 11 (1 3 / 1 2 / 2 2), 11 (2 3 / 1 2 / 1 2), 9 (2 2 / 1 2 /0 2), 9 (2 2 / 1 3 /0 1); tibiae: 12 (2 2 / 1 3 / 2 2), 10 (2 2 / 1 2 / 1 2), 8 (1 2 / 1 1 / 1 2), 9 (2 2 / 1 2 / 1 1); tarsi II –IV: not counted, 17, 17, 17. All dorsal setae of femora, genua and tibiae, anterolateral setae of femur II, genua II and IV, and tibiae II and IV, posterolateral setae of femora I and II, genua I –IV and tibiae I –III stout and weakly serrate; other leg setae setiform and smooth. With the following numbers of transverse or diagonal lines of denticles on the ventral side of legs I –IV: coxa, 0–2; trochanter, 0–3; femur, 1–2; genu, 1–3; tibia, 1–3; venter of distal rim of these segments also denticulate.

Adult male: unknown.

Material examined. All specimens collected from litter from a strawberry field at Sylling (5954 '00"N and 1016 ' 54 "E; altitude: 170 m), Buskerud county, Norway, by Dr. I. Klingen and her collaborators. Holotype female and eight paratype females collected in April 14, 2011; twelve paratype females collected in April 27, 2011. Holotype and paratypes are deposited at Departamento de Entomologia e Acarologia, Escola Superior de Agricultura “Luiz de Queiroz, Universidade de São Paulo, Piracicaba, State of São Paulo, Brazil.

Etymology. The specific name norvegicus   refers to “from Norway ”, referring to the country from which the type specimens were collected.

Remarks. This new species is most similar to Ameroseius ulmi Hirschmann   , in Westerboer & Bernhard (1963). However adult females of A. norvegicus   have seta j 1 flat and broad (j 1 leaf-shaped in A. ulmi   ); dorsal shield setae in general longer, reaching the base of the subsequent setae in the series, except j 3, z 5, z 6 and Z 3 (only j 1, Z 2 and r 2 reaching the base of the subsequent seta in the series in A. ulmi   ).

Spermathecae of nine Ameroseius   species have been described, all by Elsen (1973), who mentioned variations between species to refer mostly to the type of insertion of the tubuli into the sacculus (separate but close together, well separated, both inserted into a common ramus), as well as the shape of the induction pore and ramus. The shape of the rami and the distance between the insertions of the rami into the saculus in A. norvegicus   n. sp. are most similar to Ameroseius benoiti Elsen   , but the rami of the latter species are more elongate and its distal half is narrower than its proximal half (referred to as inverted bottle-shaped by Elsen, 1973).