Metacalanus adriaticus sp. nov.

(Figs 1-6)

Material examined: Holotype: An adult female 880 µm in length from Supurina Cave, on Vis Island in the Central Adriatic Sea in Croatia (43 o 03’0.8”E; 16 o 03’0.7”N), on 13 August 2007. The Holotype is deposited at the Croatian Natural History Museum, Zagreb, No. HPM-BSZ,1805; the paratype series comprises nine adult females and four males from different locations: 3♀, Supurina Cave, collected on 14 December 2017; 1♀, Supurina Cave collected in 2019; 1♀, Rogoznica, 11 January 2009; 2♀, ŽivaVoda, Hvar, 02 April 2005; 1♂, Supurina Cave, March 2019; and 1♂, Jama na punta Korente, Rovinj, 06 February 2005. These paratypes are all deposited at the Croatian Natural History Museum, Zagreb, No. HPM-BSZ,1806. Additional paratypes: 2♀ and 2♂ (Supurina Cave, 03 October 2005) were dissected on slides and are deposited in the first author’s personal collection.