Hydrodroma reinhardi Pesic 2002
Creators: name: Gerecke, Reinhard
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Hydrodromidae
Hydrodroma
Hydrodroma reinhardi

description: Hydrodroma reinhardi Pešić, 2002   
(Figs 8 A-D)  
 Type series (not examined): NHMB, holotype ♂, river Cijevna near Dinoša, 45 m asl., 01.07.2000 Pešić; same site and date, paratypes: 2 ♂♂, 2 ♀♀; further paratypes, University of Podgorica, collection Pešić: same site and date, 2 ♂♂, 8 ♀♀ same site, 01.10.2000, 6 ♂♂, 7 ♀♀.   
 Material examined: Coll. Gerecke, all slide mounted: Paratypes: Montenegro, River Cijevna near Dinoša, 45 m asl., 01.07.2000, Pešić, 1 ♂; same site, 01.10.2000, 2 ♂♂, 1 ♀. Further material: France, Corse F 23 Corse Sarténe (2A), Roccapina. F. Ortolo near Pont de l'Ortolo, 20 m asl., 8°51E, 41°33N, 26.09.1991 Gerecke, 1 ♀; F 92 Galéria (2B), Rau. de Tavulaghiu NE Pinzu di Corbi, 150 m asl., 11.06.1993 Gerecke 1 ♀; Italy, Lazio, I 883, Sorinano nel Cimino, spring in castagneto exp. NW, 1000 m asl., 01.08.2000 Di Sabatino, Gerecke, Goldschmidt, 1 deutonymph; Sardinia I 365, Gennargentu (NU). Fonni, R. Mattalle, 950 m, NK 23 32, 18.05.1986, Gerecke, 2 ♂♂; I 380, Alghero (SS), R. Serra S Cantoniera Rudas, 20 m, MK 47 96, 26.05.1986, Gerecke, 1 ♀, 4 deutonymphs; I 386, Monte Linas (CA), Villacidro, stream 2 near P. S. Miali, 600 m, MJ 74 67, 30.05.1986 Gerecke, 1 ♀ Barbágia Seúlo (NU), W Seúlo, Contrada Tornolù, 650 m, NK 17 14, 18.09.1991 Gerecke, 1 ♂.   
 Discussion: The detailed original description does not leave important questions open, some additional morphological features could be verified from the material authorized by Pešić listed above. Hydrodroma reinhardi is similar to H. despiciens in the range of acetabula numbers (genital field: Fig. 8 B), but differs in a smooth medial margin of Cx-I (Fig. 8 A), lower swimming setae numbers (only on IV-L-4, 2 anterior setae, posterior setae numbers II-L-5, 1; III-L-4, 2-4; IV-L-5, 3-4; IV-L-4, 4-5; IV-L-5, 3-4) and relatively larger leg claws (L 15-16 % segment 5). Further differences concern generally minor measurements of palp and leg segments (e.g., P-4 L 143-187 vs. 184-190 in H. despiciens; IV-L-5 L 239-311 vs. 332-410) and the shape of the integument: the papillosity consists of two different types as in H. despiciens, but the larger central papillae are not rounded, apically forming blunt tips (Figs 8 C-D).   
The deutonymph has not been described previously. The examined specimens show the characteristic integument papillosity as in adults and the diagnostic low swimming setae number: II-L-5, posterior, 1; III-L-4, posterior, 2 III-L-5, posterior, 2; IV-L-4, anterior 1, posterior 2; IV-L-5, posterior, 2.  
 Biology and distribution: A running water species frequently found in springs. Central Mediterranean, recently reported also from Russia (area of Yaroslavl, Caucasus: Tuzovskij 2015); here recorded for the first time from continental Italy (Lazio).
description: Published as part of Gerecke, Reinhard, 2017, The water mites of the genus Hydrodroma (Acari, Hydrachnidia, Hydrodromidae) in Europe and Africa, pp. 1-24 in Ecologica Montenegrina 13 on pages 19-22, DOI: 10.37828/em.2017.13.1, http://zenodo.org/record/13261268