Hydroporus sumakovi Poppius 1912

Designation of the lectotype of Hydroporus sumakovi Poppius, 1912

Poppius (1912: 107) described this taxon after two specimens collected by G. Sumakov on the Novaya Zemlya archipelago (Russia) (circle 3 with question mark in Fig. 13). This taxon is usually treated as a junior subjective synonym of H. acutangulus (Zimmermann 1931: 139; Zaitzev 1953: 168, 1972: 177). We have studied one syntype from the FMNH (see also Biström 1987: 37) and want to take the opportunity to designate the lectotype of this taxon: Lectotype (by present designation): 3, "N. Semlja [Latin], Belush'ya G [Cyrillic], 8.VII.1911, G. Sumakow" [Latin; hw Sumakov], "B. Poppius" [printed], " H. Sumakovi Popp." [hw Poppius], " H. aenescens J. Sahlb., Nordv. Sibir.Col. 50,29Z, J. Sahlb. det." [hw J. Sahlberg, last line printed], "Mus. Zool. H:fors [= Helsingfors = Helsinki], Spec. typ. No?586 [first digit illegible], H. Sumakovi, B. Popp." [hw in part], " Hydroporus acutangulus Th., det. A. Zimmermann" [hw A. Zimmermann, last line printed], " Lectotypus, Hydroporus sumakovi Poppius, 1912, des. Fery 2011" [red, printed] (ZMUH). Notes: The lectotype lacks nine left and eight right antennomeres, as well as the last two left tarsomeres; the right hind leg is disarticulated.

We have recently found a male in the MNB which might be the second specimen which Poppius reports in his description. We are, however, not sure about this and refrain from treating it as paralectotype. The specimen is labelled: "Novaja Semlija, 8 VII 1911 " [yellow, possibly hw Sumakov] and " Hydroporus Sumakovi Popp. " [most probably hw J. Sahlberg], " Hydroporus acutangulus Thoms., P. Petrov det. 2008" [hw P. Petrov].

Both specimens are very similar, distinctly reticulate over the entire surface, and the shape of the median lobe agrees more or less with that of H. polaris and by no means with that of H. acutangulus. This observation in combination with the record of H. polaris from the Wrangel Island (Nilsson & Holmen 1995: 48, see below) strongly suggests a study of more material from northern Russia (European and Asian parts) is needed, including also the types of Hydroporus pectoralis J. Sahlberg, 1880 and Hydroporus aenescens J. Sahlberg, 1880, which so far are treated as junior synonyms of H. acutangulus.