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| [A] Stenasellus stygopersicus Jugovic, Malek-Hosseini & Issartel sp. nov. in sulfidic water of Chah Kabootari Cave, Iran. [B, C] S. tashanicus Khalaji-Pirbalouty, Fatemi, Malek-Hosseini & Kuntner, 2018 in Tashan Cave, Iran. Jugovic, Malek-Hosseini, Issartel, Konecny-Dupré, Kuntner, Fatemi, Flot, Douady et Malard, 2024. |
Abstract
We report on a new species of Stenasellus Dollfus, 1897 (Isopoda, Stenasellidae) from groundwater of Iran. Stenasellus stygopersicus Jugovic, Malek-Hosseini & Issartel sp. nov. inhabits the Chah Kabootari Cave that is adjacent to the Tashan Cave, the type locality of the first recorded species of Stenasellidae from Iran, Stenasellus tashanicus Khalaji-Pirbalouty, Fatemi, Malek-Hosseini & Kuntner, 2018. Both caves are fed by sulfidic groundwater and belong to the Tashan-Chah Kabootari species-rich aquifer on the Zagros Mountains. Both species are characterized by a large body size (≥ 20 mm), a female-biased sexual size dimorphism, and a distinct black-pigmented Bellonci’s organ. Stenasellus stygopersicus differs from S. tashanicus by a short and wide protopodite of pleopod I, setae set essentially along the apical margin of pleopod I exopodite, the subequal length and width of the male pleopod II protopodite, and deeply bilobed endopodites of pleopods III–V. Molecular evidence suggests that while Stenasellus stygopersicus is sister to S. tashanicus, the species are genetically distinguishable, with divergence time estimates ranging from 23 to 39.8 Ma.
Keywords: biodiversity, phylogeny, Stenasellidae, groundwater, sulfidic cave
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| A. Five specimens of Stenasellus stygopersicus Jugovic, Malek-Hosseini & Issartel sp. nov. in sulfidic water of Chah Kabootari Cave, Iran. B. A specimen of S. tashanicus Khalaji-Pirbalouty, Fatemi, Malek-Hosseini & Kuntner, 2018 in Tashan Cave, Iran. C. Another specimen of S. tashanicus, hanging on the white biofilm floating at the surface of sulfidic water in Tashan Cave, Iran. |
Order Isopoda Latreille, 1816
Superfamily Aselloidea Latreille, 1802
Family Stenasellidae Dudich, 1924
Genus Stenasellus Dollfus, 1897
Stenasellus stygopersicus Jugovic, Malek-Hosseini & Issartel sp. nov.
Diagnosis: Body dorsal smooth, pleotelson being barely longer than its width (about 1.1 its width), short antennula (in males with only up to 34 segments in flagellum), barely overreaching antennal peduncle ( Fig. 3 ). Antenna with minute squama, ultimate segment of mandible palp without setae ( Fig. 3 ). Short and wide (length <width) protopodite of pleopod I, setae only along mesiodistal margin of pleopod I exopodite ( Fig. 5 ). Pleopod II protopodite subequal in length and width, exopodite segment II with only about 10 (9–11) plumose setae; endopod of pleopods III–V in males distally deeply bifurcated (i.e. bifurcation overreaches half of endopodite III–V length). A species with strongly female-biased sexual dimorphism in body size.
Etymology: The name of the new species is formed from the prefix ‘stygo’ (from ancient Greek ‘stýx’), a common prefix used to refer to groundwater dwelling animals, and the Latin word ‘persicus’ referring to Persia.
Jure Jugovic, Mohammad Javad Malek-Hosseini, Colin Issartel, Lara Konecny-Dupré, Matjaž Kuntner, Yaser Fatemi, Jean-François Flot, Christophe J. Douady and Florian Malard. 2024. A Second Species of Stenasellus Dollfus, 1897 (Isopoda, Stenasellidae) from sulfidic groundwater of Iran described using morphological and molecular methods. European Journal of Taxonomy. 968(1); 256–274. DOI: doi.org/10.5852/ejt.2024.968.2733
