Typhlodromus (Anthoseius) anomalos Ferragut

Ferragut, Francisco & Navia, Denise, 2015, Phytoseiid mites (Acari: Phytoseiidae) from Patagonia and Tierra del Fuego, Zootaxa 3990 (4), pp. 525-550: 543-545

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Typhlodromus (Anthoseius) anomalos Ferragut

n. sp.

Typhlodromus (Anthoseius) anomalos Ferragut  n. sp.

( Figures 46–51View FIGURES 46 – 49View FIGURES 50 – 51)

Diagnosis. Female dorsal shield elongate, striate and weakly reticulate. Dorsal setal pattern 12 A: 8 A. Dorsal setae short, smooth and acute except for Z 5, thick and serrate. Position of seta S 4 variable in the holotype; inserted on soft integument in the left side and on the dorsal shield in the right side. Six pairs of dorsal solenostomes (gd 1, gd 2, gd 5, gd 6, gd 8, gd 9). Peritremes almost reaching setae j 1. Sternal shield with three pairs of setae, posterior margin not well discernible, apparently concave. Ventrianal shield smooth, with four pairs of pre-anal setae and without pores. Three pairs of setae around the ventrianal. Seta JV 4 absent. Spermathecal calyx elongate, with a cylindrical base and a distal cup. Chelicerae apparently with two teeth on fixed digit, movable digit unidentate. Genu II with seven setae. One short and curved macroseta on tarsus IV. Ventrianal shield in the male oblong, reduced and with five pairs of pre-anal setae. Two large and rounded metapodal plates on the soft integument, near the ventrianal anterior angles.

FEMALE ( Figures 46–49View FIGURES 46 – 49) (one female measured)

Dorsal surface. Dorsal shield elongate, 390 long, 190 wide, striated to reticulate. Eighteen pairs of thick, smooth and acute setae, except for Z 5 serrated. Setae r 3 and R 1 on lateral integument; seta S 4 on lateral integument in the left side of the mite. Seta j 1 23, j 3 22, j 4 14, j 5 13, j 6 17, J 2 19, J 5 15, z 2 18, z 3 18, z 4 20, z 5 16, Z 4 26, Z 5 46, s 4 23, s 6 26, S 2 24, S 4 22, S 5 30, r 3 23, R 1 20. Six pairs of solenostomes, being gd 4 absent; gd 1 anterolateral to j 3, distance gd 1 –j 3 7; gd 2 close and medial to z 4, distance gd 2 –z 4 14; gd 9 posteromedial to S 5, distance gd 9 – S 5 12. Peritremes almost reaching setae j 1.

Ventral surface. Sternal shield smooth and weakly sclerotised; posterior margin difficult to discern. Apparently with three pairs of setae; st 4 inserted on the tegument. Distance st 1 –st 3 74, distance st 2 –st 2 64. Genital shield 66 wide. Smooth ventrianal shield 127 long, 99 wide at level of ZV2, 92 wide at level of anus. Anterior margin convex, laterals concave, two lateral areas of muscle attachments on the posterior margin, at the level of anus. Four pairs of pre-anal setae, very short, 7–9 long. Pre-anal pores absent. Three pairs of setae around the shield, ZV 1, ZV 3 and JV 5. Seta JV 4 absent. Seta JV 5 34 long.

Chelicerae. Not well discernible due to their position. Apparently, fixed digit with two teeth, movable digit unidentate.

Insemination apparatus. Major duct broad, atrium not prominent. Calyx 22 long, with distal cup 12 long and a proximal narrow and cylindrical structure 10 long.

Legs. Genu II with seven setae; 2 – 2 /0, 2/ 0–1. One short and curved macroseta on basitarsus IV, 26 long.

MALE ( Figures 50–51View FIGURES 50 – 51) (one male measured):

Dorsal surface. Dorsal shield 330 long, 176 wide, anteriorly striated and reticulate posteriorly. Twenty pairs of smooth and acute setae, being Z 5 lightly serrated. Seta j 1 22, j 3 18, j 4 13, j 5 11, j 6 15, J 2 14, J 5 11, z 2 15, z 3 12, z 4 14, z 5 12, Z 4 23, Z 5 33, s 4 20, S 2 20, S 4 20, S 5 22, r 3 19, R 1 17. Six pairs of solenostomes, with gd 4 absent. Peritremes extend to bases of setae j 3.

Ventral surface. Ventrianal shield oblong in shape and reduced, showing two well-developed metapodal plates at the level of anterior corners, 16–18 long, 8–10 wide. Anterior margin straight, laterals strongly convex; length 120, width at level of ZV 2 115, at level of anus 88. Five pairs of pre-anal setae; pre-anal pores absent. Seta JV 5 24.

Chelicerae. Inner margin not discernible. Spermatodactyl L-shaped, with a small anterior projection.

Legs. Macroseta on leg IV (basitarsus) short and curved, 24 long.

Type material. One female holotype and one male paratype on Araucaria araucana (Molina) K. Koch  ( Araucariaceae  ). Mamuil-Malal Pass, 65 Km from Junín de los Andes ( Argentina), near the border between Argentina and Chile; 39 º 34 ' 56 " S, 71 º 27 ' 44 " W; 1210 m asl. 7 January 2013. Holotype female and male paratype were deposited at Museo Nacional de Ciencias Naturales, Madrid, Spain ( MNCNAbout MNCN). Reference number of holotype: MNCNAbout MNCN 20.02 / 17395; 1 male paratype MNCNAbout MNCN 20.02 / 17396.

Etymology. The Greek word anomalos  means "unusual" and "different" and refers to the freakish morphological features in the female and male of this species.

Comments. Typhlodromus (Anthoseius) anomalos  sp. nov. is the unique species in the genus with seta S 4 present and JV 4 absent, and it does not fit with the species groups created by Chant & McMurtry (1994). Seta S 4 is inserted well ahead of seta Z 4 and much closer to S 2 than to S 5. Because this species is represented only by two adults we do not know if this seta is found in the same position in immature stages. Despite of its position we consider this seta S 4 because S 3, present in the families Ascidae  and Blattisocidae, is suppressed in the Phytoseiidae ( Chant & McMurtry, 2007)  . On the right side of holotype S 4 is inserted on the dorsal shield; however, on the left side is inserted on the lateral integument.

The new species shares the absence of seta JV 4 with Typhlodromus (Anthoseius) arizonicus (Tuttle & Muma)  . This apomorphy is shared with species in the tribes Typhloseiopsini and Metaseiulini and it was considered as a secondary adaptation by Chant & McMurtry (1994). Based on this atypical setal pattern Denmark & Evans (2011) placed T. (A.) arizonicus  in the genus Meyerius  and described Meyerius waltheriae  Denmark & Evans as a related species. It is interesting to note that seta S 2 is located in its normal position (more or less aligned with J 2) in T. (A.) arizonicus  but distinctly displaced in a posterior position (anterolaterad to solenostome gd 8) in M. waltheriae  . The insertion of S 2 in this latter species is similar to the position of that we have considered seta S 4 in T. (A.) anomalos  . As T. (A.) arizonicus  and M. waltheriae  have been described from only one female and T. (A.) anomalos  from two adults will be necessary to examine more individuals, including immature stages, to end the uncertainty about these dorsal setae.

The shape of the male ventrianal shield in this species, broadly pentagonal, and the presence of two large metapodal plates are also a very unusual character.

The mite was collected on the Chilean pine or "Pehuén", Araucaria araucana  , considered as a living fossil and now restricted to Chilean and Argentinian south–central Andes above 1,000 m asl.


Museo Nacional de Ciencias Naturales