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A new leech species    Helobdella   blinni    sp. n. , is described from Montezuma Well, an isolated travertine spring mound located in central Arizona, USA. In its native habitat,    H.   blinni    had been previously identified as    Helobdella   stagnalis    (Linnaeus, 1758), which was later reclassified to    Helobdella   modesta    (Verrill, 1872). Similar to the European    H.   stagnalis    and North American    H.   modesta   ,    H.   blinni    has six pairs of testisacs, five pairs of smooth crop caecae, one lobed pair of posteriorly-directed crop caecae, one pair of eyes, a nuchal scute, and diffuse salivary glands. However, the pigmentation of this new species ranges from light to dark brown, unlike    H.   modesta    which tends to be light grey in color. Also,    H.   modesta    produces a clutch of 12-–35 pink eggs, whereas    H.   blinni    produces smaller clutches of white eggs (7–14, 0.5 ± 0.15 mm, N = 7) and consequently broods fewer young (1–14, 7 ± 3.3 mm, N = 97).    Helobdella   blinni    are also able to breed year-round due to the constant warm water conditions in Montezuma Well. Their breeding season is not restricted by seasonal temperatures. These species are morphologically similar, however, comparing the  COI  mtDNA sequences of    H.   blinni    with sequences from nearby populations of    H.   modesta    and other    Helobdella    species from GenBank indicate that    H.   blinni    is genetically distinct from these other    Helobdella    populations.

Helobdella blinni sp. n. ( Hirudinida , Glossiphoniidae ) a new species inhabiting Montezuma Well, Arizona, USA