Image dataset: Freshwater leeches (Hirudinida: Glossiphoniidae) from Tibet collected by P.K. Kozlov's expedition in 1900-1901

This dataset is a supplement to our review paper entitled "Taxonomic diversity of leeches on the world's highest mountain ranges and plateaus" (Bolotov <i>et al.</i> 2025 in Zool. J. Linn. Soc.; https://doi.org/10.1093/zoolinnean/zlaf051). It contains photographs of historical specimens of three glossiphoiniid leech species, that is, <i>Alboglossiphonia </i>cf. <i>szechuanensis </i>(Chen, 1959), <i>Theromyzon maculosum</i> (Rathke, 1862), and <i>Th. mollissimum</i> (Grube, 1871), from the Tibetan Plateau (catalogue numbers: ZIN 1-‘Gl-heteroclita’; ZIN 14/44093; and ZIN 13/44092, respectively). The samples were collected in 1900-1901 by P.K. Kozlov's expedition to Mongolia and Tibet (Kozlov 1905, 1906; Andreev and Yusupova 2018). These leeches were initially processed by Plotnikov (1907) but all the species were incorrectly identified (see below). The three lots from Tibet were re-examined and photographed by us using a stereomicroscope Nikon SMZ 25 with a Nikon DS-Ri2 digital camera (Nikon Corporation, Minato, Tokyo, Japan). Large leech specimens were photographed using a Canon EOS R6 Mark II camera with a Canon EF-S 60 mm f/2.8 Macro USM lens (Canon Inc., Shimomaruko, Ota, Tokyo, Japan). The specimens are deposited in the Zoological Institute of the Russian Academy of Sciences [abbreviation: ZIN], Saint Petersburg, Russia.<br><br><b>HISTORICAL SPECIMEN PHOTOS (ZIN collection; by Tatyana A. Eliseeva)</b>D = dorsal view; V = ventral view<br>*****<b>(1) </b><b><i>Alboglossiphonia </i></b><b>cf. </b><b><i>szechuanensis </i></b><b>(Chen, 1959)</b>= <i>Glossosiphonia heteroclita</i> Plotnikov (1907): 135 [partim; identification error]Lot <b>ZIN 1-'Gl-heteroclita'</b>, labelled: “[Swamp spring], <i>Dza-Chu Valley (Blue River basin), 12,100' a.s.l.,</i> [late July – mid-August 1900], <i>Tibetan Expedition,</i> [Kaznakov leg.]” [China: swamp spring, Zha Chu River valley, 33.0037°N, 96.9907°E, approx. 3,700 m alt., Yangtze River basin, Qinghai, August 1900, collected by P.K. Kozlov's expedition to Mongolia and Tibet, Kaznakov leg.] (5 adult specimens; all illustrated here)Image files (25 photos):- <i>sample label</i>: Alb_sze ZIN 1_label.JPG- <i>specimen 1</i> [adult]: Alb_sze ZIN 1_01 head dorsal.jpg; Alb_sze ZIN 1_01 head ventral.jpg; Alb_sze ZIN 1_01 specimen dorsal.jpg; Alb_sze ZIN 1_01 specimen ventral.jpg- <i>specimen 2</i> [adult]: Alb_sze ZIN 1_02 head dorsal.jpg; Alb_sze ZIN 1_02 head ventral.jpg; Alb_sze ZIN 1_02 specimen dorsal.jpg; Alb_sze ZIN 1_02 specimen ventral.jpg- <i>specimen 3</i> [adult]: Alb_sze ZIN 1_03 head dorsal.jpg; Alb_sze ZIN 1_03 head ventral.jpg; Alb_sze ZIN 1_03 specimen dorsal.jpg; Alb_sze ZIN 1_03 specimen ventral.jpg- <i>specimen 4</i> [adult]: Alb_sze ZIN 1_04 head dorsal 1.jpg; Alb_sze ZIN 1_04 head dorsal 2.jpg; Alb_sze ZIN 1_04 head ventral.jpg; Alb_sze ZIN 1_04 specimen dorsal 1.jpg; Alb_sze ZIN 1_04 specimen dorsal 2.jpg; Alb_sze ZIN 1_04 specimen ventral 1.jpg; Alb_sze ZIN 1_04 specimen ventral 2.jpg- <i>specimen 5</i> [adult]: Alb_sze ZIN 1_05 head dorsal.jpg; Alb_sze ZIN 1_05 head ventral.jpg; Alb_sze ZIN 1_05 specimen dorsal middle.jpg; Alb_sze ZIN 1_05 specimen dorsal.jpg; Alb_sze ZIN 1_05 specimen ventral.jpg<br>*****<b>(2) </b><b><i>Theromyzon maculosum</i></b><b> (Rathke, 1862)</b>= <i>Hemiclepsis tessellata</i> Plotnikov (1907): 139 [partim; identification error]Lot <b>ZIN 14/44093</b>, labelled “<i>Lake Alyk-Nor, southern slope of Burkhan-Burda, 12,700' a.l., 29.v.1900 </i>[Julian calendar date]<i>, Tibetan Expedition leg.</i>” [China: Lake ‘Alyk-Nor’, 35.5660°N, 97.1218°E, 4,100 m alt., southern slope of Burchan-Budda Mountain Range, Dulan County, Haixi Mongol and Tibetan Autonomous Prefecture, Qinghai, 11 June 1900, collected by P.K. Kozlov's expedition to Mongolia and Tibet] (2 adults, one sub-adult, and 61 juveniles; all illustrated here)Image files (13 photos):- <i>sample label</i>: The_mac ZIN 14-44093 label.JPG- <i>specimen 1</i> [adult]: The_mac ZIN 14-44093 specimen 1 D 1.jpg; The_mac ZIN 14-44093 specimen 1 D 2.jpg; The_mac ZIN 14-44093 specimen 1 head V.jpg; The_mac ZIN 14-44093 specimen 1 V.jpg- <i>specimen 2</i> [sub-adult]: The_mac ZIN 14-44093 specimen 2 D.jpg; The_mac ZIN 14-44093 specimen 2 head V.jpg; The_mac ZIN 14-44093 specimen 2 V.jpg- <i>specimen 3</i> [adult]: The_mac ZIN 14-44093 specimen 3 D.jpg; The_mac ZIN 14-44093 specimen 3 head V.jpg; The_mac ZIN 14-44093 specimen 3 V.jpg- <i>juvenile specimens</i>: The_mac ZIN 14-44093 juveniles part 1.jpg; The_mac ZIN 14-44093 juveniles part 2.jpg<br>*****<b>(3) </b><b><i>Theromyzon mollissimum</i></b><b> (Grube, 1871)</b>= <i>Hemiclepsis tessellata</i> Plotnikov (1907): 139 [partim; identification error]Lot <b>ZIN 13/44092</b>, labelled “<i>Eastern Qaidam, Khara-Usu River, approx. 8,600' a.l., </i>[2]<i> August 1901 </i>[Julian calendar date]<i>, Tibetan Expedition leg.</i>” [China: Hala Wusu River, 36.2792°N, 97.4192°E, approx. 2,800 m alt., eastern part of the Qaidam Basin, Qinghai, 15 August 1901, collected by P.K. Kozlov's expedition to Mongolia and Tibet] (11 adults, one sub-adult, and 261 juveniles; all illustrated here)Image files (35 photos):- <i>sample label</i>: The_mol ZIN 13-44092 label.JPG- <i>specimen 1</i> [adult]: The_mol ZIN 13-44092 specimen 1 D camera.jpg; The_mol ZIN 13-44092 specimen 1 D.jpg; The_mol ZIN 13-44092 specimen 1 head D.jpg; The_mol ZIN 13-44092 specimen 1 head V.jpg; The_mol ZIN 13-44092 specimen 1 V camera.jpg; The_mol ZIN 13-44092 specimen 1 V.jpg- <i>specimen 2</i> [adult]: The_mol ZIN 13-44092 specimen 2 D.jpg; The_mol ZIN 13-44092 specimen 2 head D.jpg; The_mol ZIN 13-44092 specimen 2 head V.jpg; The_mol ZIN 13-44092 specimen 2 V.jpg- <i>specimen 3</i> [sub-adult]: The_mol ZIN 13-44092 specimen 3 D.jpg; The_mol ZIN 13-44092 specimen 3 head V.jpg; The_mol ZIN 13-44092 specimen 3 V.jpg- <i>specimen 4</i> [adult]: The_mol ZIN 13-44092 specimen 4 D camera.jpg; The_mol ZIN 13-44092 specimen 4 V camera.jpg- <i>specimen 5</i> [adult]: The_mol ZIN 13-44092 specimen 5 D camera.jpg; The_mol ZIN 13-44092 specimen 5 V camera.jpg- <i>specimen 6</i> [adult]: The_mol ZIN 13-44092 specimen 6 D camera.jpg; The_mol ZIN 13-44092 specimen 6 V camera.jpg- <i>specimen 7</i> [adult]: The_mol ZIN 13-44092 specimen 7 D camera.jpg; The_mol ZIN 13-44092 specimen 7 V camera.jpg- <i>specimen 8</i> [adult]: The_mol ZIN 13-44092 specimen 8 D camera.jpg; The_mol ZIN 13-44092 specimen 8 V camera.jpg- <i>specimen 9</i> [adult]: The_mol ZIN 13-44092 specimen 9 D camera.jpg; The_mol ZIN 13-44092 specimen 9 V camera.jpg- <i>specimen 10</i> [adult]: The_mol ZIN 13-44092 specimen 10 D camera.jpg; The_mol ZIN 13-44092 specimen 10 V camera.jpg- <i>specimen 11</i> [adult]: The_mol ZIN 13-44092 specimen 11 D camera.jpg; The_mol ZIN 13-44092 specimen 11 V camera.jpg- <i>specimen 12</i> [adult]: The_mol ZIN 13-44092 specimen 12 D camera.jpg; The_mol ZIN 13-44092 specimen 12 V camera.jpg- <i>juvenile specimens</i>: The_mol ZIN 13-44092 juveniles part 1.jpg; The_mol ZIN 13-44092 juveniles part 2.jpg; The_mol ZIN 13-44092 juveniles part 3.jpg<br><b>REFERENCES</b>Andreev A, Yusupova T. Pyotr Kuz’mich Kozlov (1863–1935). In: Andreev AI, Baskhanov M, Yusupova T (eds) <i>The Quest for Forbidden Lands: Nikolai Przhevalskii and his Followers on Inner Asian Tracks</i>. Leiden: Brill, 2018; 212–254. https://doi.org/10.1163/9789004376267_006Bolotov IN, Eliseeva TA, Gofarov MY, Tsiplenkina IG, Kondakov AV. Taxonomic diversity of leeches on the world's highest mountain ranges and plateaus. <i>Zoological Journal of the Linnean Society</i> 2005. https://doi.org/10.1093/zoolinnean/zlaf051Kozlov PK. Through Mongolia to the boundaries of Tibet. In: <i>Mongolia and Kam: Proceedings of the Expedition of the Imperial Russian Geographic Society carried out in 1899-1901 under the leadership of P. K. Kozlov</i>. Vol. 1, Part 1. Saint Petersburg: Herold, 1905; 1–256. [in Russian]Kozlov PK. Kam and way back. In: Grigoriev AV (ed) <i>Mongolia and Kam: Proceedings of the Expedition of the Imperial Russian Geographic Society carried out in 1899-1901 under the leadership of P. K. Kozlov</i>. Vol. 1, Part 2. Saint Petersburg: Herold, 1906; 1–732. [in Russian]Plotnikov V. Glossosiphoniidae, Hirudinidae et Herpobdellidae du Musée Zoologique de l'Académie Impériale des Sciences. <i>Annuaire du Musée zoologique de l'Académie des sciences de St. Pétersbourg</i> 1907;10:133–158. https://www.biodiversitylibrary.org/item/121130#page/5 [in Russian]