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Background   Ixodes collaris  Hornok, 2016 is a recently discovered tick species associated with bats in Asia. This study provides the description of the male and the larva, as well as high quality drawings of all stages.    Methods  Ticks were collected from cave walls and bats in Phia Oac (Vietnam). DNA was extracted from one individual of each stage/sex, while another was morphometrically analysed. Based on two genetic markers, all ticks were identified as  I. collaris .    Results  The male of  I. collaris  has long legs (i.e. the length of Haller’s organ exceeds the maximum diameter of tarsus I), unlike the male of  I. simplex  Neumann, 1906, but similarly to males of  I. vespertilionis  Koch, 1844 and  I. ariadnae  Hornok, 2014. The lateral and medial edges of the palpi of male  I. collaris  are both convexly curved, unlike in  I. ariadnae  and  I. simplex , but similarly to  I. vespertilionis . The male of  I. collaris  has long palpal setae (up to 210 µm), unlike the males of  I. ariadnae  (30–100 µm) and  I. simplex  (20–80 µm), but similarly to  I. vespertilionis  (100–200 µm). Males of  I. collaris  have sparse distribution of long palpal setae ( vs  dense in  I. vespertilionis ) and posteriorly diverging, sclerotized trapezoid ridge dorsally on the basis capituli (posteriorly convergent, U-shaped and less evident in  I. vespertilionis ). The larva of  I. collaris  has long legs (unlike the larva of  I. simplex , but similarly to  I. vespertilionis  and  I. ariadnae ), elongated club-shaped palpi (240 × 70  vs  200 × 90 µm in  I. ariadnae , 200 × 70 µm in  I. vespertilionis ; and 140 × 60 µm in  I. simplex :), pentagonal scutum, which is longer than broad (different from  I. ariadnae  and  I. simplex , but similar to that of  I. vespertilionis ). The larva of  I. collaris  has strongly concave caudolateral margin of ventral basis with perpendicular angle ( vs  slightly concave, with obtuse angle in  I. vespertilionis ) and a prominent, dark sclerotized edge, “collar” (absent in  I. vespertilionis ).    Conclusion  Several features allow to distinguish the male and the larva of  I. collaris  morphologically from those of other bat-associated ixodid tick species.

Description of the male and the larva of Ixodes collaris Hornok, 2016 with drawings of all stages