Typhlodromus sandrae Ragusa & Tsolakis

Tsolakis, Haralabos & Ragusa, Salvatore, 2015, Considerations on systematics of the Phytoseiidae (Acari: Mesostigmata), with definition of a new species group and description of a new species, Zootaxa 3926 (2), pp. 229-243: 234

publication ID

http://dx.doi.org/10.11646/zootaxa.3926.2.4

publication LSID

lsid:zoobank.org:pub:57A156D8-A3ED-4E3A-997B-55CED2C9695C

persistent identifier

http://treatment.plazi.org/id/03C5100C-FFCA-FF84-FF39-FF287CD6F945

treatment provided by

Plazi

scientific name

Typhlodromus sandrae Ragusa & Tsolakis
status

sp. nov.

Typhlodromus sandrae Ragusa & Tsolakis  sp. nov.

( Figs 2–7View FIGURES 2 – 7)

Female. Insemination apparatus ( Fig. 5View FIGURES 2 – 7). Calyx short, narrow (10-11 µm deep, 2–3 µm wide) tubular, without neck; thin-walled at the part closer to atrium; an annular thickening of the wall of the calyx is present in the part closer to vesicle occuping about 2 / 3 of the calyx. Atrium bulbous, as large as the basis of the calyx or slightly wider. Embolus well visible. Minor duct thin, not clearly visible. Major duct thin-walled, long (23 µm), narrow, flaring slightly distally.

Dorsum ( Fig. 2View FIGURES 2 – 7). Dorsal shield oval with a waist at level of setae R 1. Reticulation and sigilla clearly visible. Five pairs of solenostomes are present: gd 2 posteroantiaxial to j 4, gd 4 posteroantiaxial to s 4, gd 6 posteroparaxial to s 6, gd 8 anteroantiaxial to Z 4 and gd 9 paraxial to S 5. Poroids are not visible on the dorsal shield. Dorsal setae short, most of similar length, and smooth, except S 4, S 5, Z 4 and Z 5 which are serrated. Setae Z 5 thicker and capitate ( Fig. 7View FIGURES 2 – 7). Setae r 3 and R 1 on interscutal membrane. Length of dorsal shield 376, width 169 (166–172). Measurements of dorsal setae in µm [in brackets the upper and lower limits around the mean of each seta length, calculated using method proposed by Tixier (2012)]: j 1 21 (16–26); j 3 20 (15–25); j 4 14 (11–18); j 5 14 (11–18); j 6 16 (12–20); J 2 18 (13–22); J 5 10 (8–13); z 2 16 (12–20); z 3 18 (14–22); z 4 19 (14–24); z 5 15 (11–19); s 4 20 (15–25); s 6 21 (16–26); Z 4 24 (18–30); Z 5 38 (30–45); S 2 26 (20–32); S 4 30 (24–36); S 5 31 (24–38); r 3 22 (17–27); R 1 22 (17–27).

Ventral idiosoma ( Fig. 3View FIGURES 2 – 7). Sternal shield lightly sclerotised and smooth. Posterior margin and poroids pst 1 and pst 2 are not visible. Setae ST 1, ST 2 and ST 3 inserted on sternal shield. Setae ST 4 tylochorous; poroid pst 3 not visible. Length of sternal shield 96 µm, width 70 µm. Genital sigilla clearly visible. Lateral margin of genital shield with pronounced indentation posterior to ST 5. Ventrianal shield (VAS) subpentagonal (length 120 µm, width at level of ZV 2 98 µm), slightly constricted at level of JV 3 (width 88 µm). Setae JV 1, JV 2, JV 3 and ZV 2 on VAS. Setae ZV 1, ZV 3, JV 4 and JV 5 on unsclerotised membrane. Solenostome gv 3 punctiform and posteroparaxial to JV 3. Setae JV 5 40 (30–47) long, smooth and slightly spatulate ( Fig. 7View FIGURES 2 – 7). Sigilla sgpa (6 th pair) on interscutal membrane. Inguinal sigilla (metapodal plates) thick (width 8 µm), 20 µm long ( Fig. 3View FIGURES 2 – 7).

Legs ( Fig. 4View FIGURES 2 – 7). Leg IV. Four spatulate setae are present on genu: ad 1 18 (14–22), ad 2 15 (12–20), pd 1 17 (12–20), pd 2 18 (14–22) (1-2 / 0-2 / 1 - 1). Three capitate setae are present on tibia: ad 1 19 (14–24), pd 1 20 (14–24), pd 2 21 (16–26) (1 - 1 / 0-2 / 1 - 1). Tarsus: one capitate macroseta pd 33 (24–38) (1 - 1 / 0-1 / 0-1).

Chelicerae ( Fig. 6View FIGURES 2 – 7). Fixed digit with three teeth plus apical tooth. Pilus dentilis evident, long (19 µm), with a large base. Movable digit with six teeth in addition to apical tooth.

Peritreme ( Fig. 2View FIGURES 2 – 7). Apex of peritreme between bases of j 1 and j 3, closer to the former.

Diagnostic notes. Typhlodromus (Anthoseius) sandrae  belongs to the new porathi  species group. This species is similar to T. (A.) porathi  , T. (A.) betulae  , T. (A.) krimbasi  , T. (A.) wainsteini  and T. (A.) dactyliocalyx  . The six teeth on the movable digit, the long and thick pilus dentilis, the indentation on genital shield, the primitive condition of the solenostome gv 3 and the eight spatulate setae present on leg IV, easily distinguish the new species from the others belonging to the same species group. For the evolution of the solenostome gv 3 see Athias-Henriot (1978) and Tsolakis & Ragusa (2010). The characters that separate these species are summarised in Table 1.

Location of types. Holotype female (No. 2710 C) and one paratype (No. 2710 A) collected on Vitis vinifera L. at Ruvo di Puglia, Bari ( Italy), 9 th May 1997. Type material deposited in the Acari  collection of the Laboratory of Applied Acarology "Eliahu Swirski", Department of Agricultural and Forest Sciences, University of Palermo ( Italy).

Etymology. The species is named after Sandra Ragusa, granddaughter of the senior author.