Thalassogamasus lindrothi ( Sellnick, 1974 ) Makarova, 2019

Makarova, Olga L., 2019, North Pacific versus North Atlantic: a case with species of the amphiboreal littoral mite genus Thalassogamasus gen. nov. (Parasitifomes, Mesostigmata Parasitidae), Zootaxa 4647 (1), pp. 457-485 : 480

Thalassogamasus lindrothi ( Sellnick, 1974) comb. nov.

Parasitus (Eugamasus) lindrothi Sellnick, 1974 ; female, p. 211

Parasitus (Neogamasus) anderssoni Sellnick, 1974 ; male, p. 213, syn. nov.

Figs 80–87

The female of Parasitus (Eugamasus) lindrothi and the male of Parasitus (Neogamasus) anderssoni were described my Max Sellnick in 1974 from material collected in Iceland during 1966 by Prof. Carl Lindroth’s team (Lindroth et al., 1973). The morphologies of both, female and male, correspond to the generic diagnosis of Thalassogamasus . They have a homogenous dorsal chaetome enriched by setae laterocaudally and a strongly reduced peritrematal shield that is free posteriorly. The female of Parasitus lindrothi has an epigynium that is extremely attenuated, whiplike anteriorly, a genital shield that is fused with the ventrianal shield, and an endogynium with a large transverse sclerotic mass. The male of Parasitus (Neogamasus) anderssoni is totally (judging on Fig. 12 , p. 213) bereft of tritosternum, has a deeply cleft hypostome, and a sternitigenital shield separated from the ventrianal shield; its dorsal shields do not cover the entire dorsum, and its opisthonotal shield is oligotrichous with 11 pairs of setae (J 1–5, Z 1–5, and one seta of S series). Both female of P. lindrothi and male of P. anderssoni , were found in Iceland on seashore habitats, under seaweed and on a gravel-plain, respectively (Lindroth et al., 1973; Sellnick, 1974). All of these morphological and ecological features argue for both their conspecificity and placement in the genus Thalassogamasus .

Figures

FIGURES 80–87. Thalassogamasus lindrothi comb. nov. 80–82. Female; 80. Ventral idiosoma; 81. Metasternal and epigynal structures; 82. Cheliceral digits; 83–87. Male; 83. Cheliceral digits; 84. Subcapitulum; 85. Ventral idiosoma; 86. Dorsal idiosoma; 87. Femur, genu and tibia II (after Sellnick, 1974; modified).

FIGURES 7–17. Thalassogamasus sidortschukae, female. 7. Dorsal idiosoma; 8. Chelicera; 9. Tritosternum; 10–14. Variant forms of gnathotectum; 15. Tarsus II; 16. Tarsus IV; 17. Subcapitulum.