Hydrodroma rheophila Cook, 1967

Gerecke, Reinhard, 2017, The water mites of the genus Hydrodroma (Acari, Hydrachnidia, Hydrodromidae) in Europe and Africa, Ecologica Montenegrina 13, pp. 1-24 : 19

publication ID

https://doi.org/ 10.37828/em.2017.13.1

DOI

https://doi.org/10.5281/zenodo.12717672

persistent identifier

https://treatment.plazi.org/id/B5628784-FFD9-FFBA-FF46-31E1FF58FAD1

treatment provided by

Felipe

scientific name

Hydrodroma rheophila Cook, 1967
status

 

Hydrodroma rheophila Cook, 1967

( Figs 7 View Figure 7 C-H)

Type series ( not examined): India, Maharashtra state, coll. Cook, FMC. Holotype ♀, small stream five miles west of Wai, gravel bar, 13.03.1963, Collection 90; paratypes: same site as holotype, 2 ♂♂; 2 ♀♀; headwaters of Krishna river near Wai , Collection 22, 29.11.1962, 3 ♂♂; 2 ♀♀, 15.12 1962, 1 ♀; Ghod river 42 miles northeast of Poona , Collection 30, 1 ♀; 14 miles north of Ahmadnager , small spring, Collection 67, 04.02.1962 1 ♂; 1 ♀; 15 miles south of Poona , small stream, gravel bar, 05.03.1963, Collection 87, 1 ♂; 2 ♀♀.

Material examined: Greece, Lesbos , stream Mylopotamos. 06.05.2000 coll. Smit, 3 ♀♀ .

Discussion: As observed by Cook (1967), this species is very similar to the African H. perreptans in the widely reduced swimming setation ( Figs 8 View Figure 8 F-H). The females from Lesbos resemble H. perreptans also in the rather large leg claws (L about 50 µm, L ratio claw/segment 5, 20-27 %), and in the heterogeneous integument structure, with larger papillae surrounded by six small, little prominent elevations. However, in the investigated specimens, the large papillae ( Figs 7 View Figure 7 C-D) are more flattened and rounded and less densely arranged than in H. perreptans . The key difference to H. perreptans is found in the stouter palp, in particular segment P-4 – L/H measurements of a lesbian specimen are: P-1, 0.8; P-2, 1,4; P-3, 0.9; P-4, 3.7; P-5, 3,7 (compare Fig. 7 E View Figure 7 with Fig. 2 F View Figure 2 ).

Biology and distribution: As in the African H. perreptans , leg morphology and setation is an obvious adaptation to life in running waters. After the original description from India recorded also from Iran, Oman, Taiwan (with a question mark) and the island of Lesbos in the Aegean Sea (the outpost population discussed here).

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