Trombidium holosericeum (Linnaeus, 1758)

Haarder, Simon & Mąkol, Joanna, 2022, Terrestrial Parasitengona mites (Trombidiformes) of Denmark - new data on parasite-host associations and new country records, Acarologia 62 (2), pp. 508-520 : 513-515

Trombidium holosericeum (L.)

Species widely distributed in the Palaearctic, known from all active life instars ( Mąkol and Wohltmann 2012, and references therein); recorded as parasite of Dermaptera (Forficulidae) , Orthoptera (Gryllotalpidae) , Hemiptera ( Lygaeidae Delphacidae , Miridae , Cercopidae , Cicadellidae , Anthocoridae ), Mecoptera (Panorpidae) , Lepidoptera ( Noctuidae , Nymphalidae ), Hymenoptera ( Ichneumonidae , Apidae ), Coleoptera ( Chrysomelidae , Cantharidae , Curculionidae , Cerambycidae , Leiodidae , Carabidae , Melolonthidae ), Diptera ( Empididae , Culicidae , Limoniidae , Drosophilidae , Muscidae , Oestridae , Calliphoridae , Sarcophagidae ) and Araneae ( Linyphiidae , Pisauridae , Araneidae ). The list of hosts’ genera and species has been provided by Felska et al. (2018).

Records:

• Pinalitus viscicola (Puton, 1888) ( Hemiptera : Miridae ) [det. Ulrik Hasle Nielsen], Mørkøv (Gladsaxe), 17 July 2019, leg. Linda-Kjaer Thomsen and Lars Thomas; 1 H/1 LV/dorsal side of the body, at thorax/abdomen border ( Fig. 2B )

[?] Leptopterna dolabrata ( Hemiptera : Miridae ); D – T. holosericeum on Cryptinae sp. ( Hymenoptera : Ichneumonidae ); E – T. holosericeum *

on Melanostoma scalare ( Diptera : Syrphidae ); F – T. holosericeum on Dioctria sp. ( Diptera : Asilidae ). Not to scale. *Larvae depigmented due to preservation in EtOH.

• Campyloneura virgula (G. A. W. Herrich-Schäffer, 1835) ( Hemiptera : Miridae ), Birkerød, 19 July 2020, leg. Linda Kjaer-Thomsen and Lars Thomas; 1 H/1 LV

• Dicyphus epilobii Reuter, 1883 ( Hemiptera : Miridae ) [det. Linda-Kjaer Thomsen and Lars Thomas], Staunings Ø (Solrød), 25 July 2019, leg. Linda-Kjaer Thomsen and Lars Thomas; 1

H/1 LV

• Dicyphus sp. ( Hemiptera : Miridae ), Rallebaek (Faaborg), 04 August 2020, leg. Simon Haarder; 1 H/1 LV/at the base of right wing

• [?] Leptopterna dolabrata (L.) ( Hemiptera : Miridae ), Birkerød, 22 July 2020, leg. Linda Kjaer-Thomsen and Lars Thomas; 1 H/1 LV/close to the base of left coxa I ( Fig. 2C )

• Himacerus mirmicoides (O. G. Costa, 1834) ( Hemiptera : Nabidae ), Bønsvighoved Skov,

13 July 2020, leg. Brian Willum Petersen; 1 H (nymph)/1 LV/ventral side of the body, at head/thorax border

• Cryptinae indet. ( Hymenoptera : Ichneumonidae ), Lynghøjen ved Hadsten, 09 June 2018, leg. Kåre Würtz Sørensen; 1 H/3 LV/dorsal side of the body, mesothorax/metathorax ( Fig. 2D )

• Melanostoma scalare (Fabricius, 1794) ( Diptera : Syrphidae ) [det. Karsten Thomsen], Oreby Skov, 19 August 2019, leg. Simon Haarder; 1 H/2 LV/dorsal side of the body, at thorax/abdomen border ( Fig. 2E )

• Platypalpus longiseta (Zetterstedt, 1842) ( Diptera : Hybotidae ) [det. Walther Gritsch], Flakfortet (Copenhagen), 18 July 2019, leg. Linda-Kjaer Thomsen and Lars Thomas; 1 H/1 LV/dorsal side of the body, at mesothorax/metathorax border

• Platypalpus sp. ( Diptera : Hybotidae ), Nysø v. Praestø, 04 July 2020, leg. Brian Willum Petersen; 1 H/1 LV

• Empis aestiva Loew, 1867 ( Diptera : Empididae ) [det. Walther Gritsch], Rude Skov, 21

July 2019, leg. Linda-Kjaer Thomsen and Lars Thomas; 1 H/1 LV

• Dioctria sp. ( Diptera : Asilidae ), Bønsvighoved Skov, 13 July 2020, leg. Brian Willum Petersen; 1 H/1 LV/at the base of wings ( Fig. 2F )

Note: Campyloneura virgula , Dicyphus epilobii , Leptopterna dolabrata and Pinalitus viscicola (Miridae) , Himacerus mirmicoides (Nabidae) , Dioctria sp. (Asilidae) , Empis aestiva (Empididae) , Platypalpus longiseta (Hybotidae) , Melanostoma scalare (Syrphidae)

and Cryptinae indet. ( Hymenoptera : Ichneumonidae ) are new host records. Further, the families Asilidae , Hybotidae and Syrphidae (Diptera) as well as Nabidae (Hemiptera) have not previously been associated with T. holosericeum .

Figures

Figure 2 Trombidiid larvae (Parasitengona: Trombidiidae) parasitizing various hosts: A – Paratrombium egregrium* on Pachyneuron groen- landicum(Hymenoptera: Pteromalidae); B –Trombidium holosericeumon Pinalitus viscicola(Hemiptera: Miridae); C –T. holosericeum* on