Niphargus tatrensis, Wrzesniowski, 1888

Sket, Cene Fišer Charles Oliver Coleman Maja Zagmajster Benjamin Zwittnig Reinhard Gerecke Boris, 2010, Old museum samples and recent taxonomy: A taxonomic, biogeographic and conservation perspective of the Niphargus tatrensis species complex (Crustacea: Amphipoda), Organisms Diversity & Evolution (New York, N. Y.) 10 (1), pp. 5-22 : 16

Niphargus tatrensis species complex

Diagnosis

Body length up to 20 mm. Pereonite VII with 2–4 slender postero-ventral setae, pleonites I–III with 6–8 setae along dorso-posterior margin. Epimeral plates II–III with distinct postero-distal corner, but never produced. Urosomite I postero-dorso-laterally with 1 weak seta; urosomite II postero-dorso-laterally with 2–4 spiniform setae; urosomite III without setae. Telson roughly quadrangular (length/width = 0.80–0.95), with deep cleft (65–75% of length); lobes apically of variable shape. Telson armed with long spines (40–60% of telson length); apical and lateral strong, spiniform setae always present, mesial and dorsal spiniform setae only in certain species/populations ( Table 1). Antenna I 40–50% of body length, maxilla I with 7 uni-, bi- or pluri-toothed stout setae; inner lobe with 2–3 (rarely 4) setae. Propods of gnathopods I–II small to middle-sized (gnathopod II propodus length + palm length + diagonal length = 15– 20% of body length), subquadrate, palm convex and slightly inclined; propodus II larger than propodus I. Gnathopod dactyls with a row of single setae along anterior margins. Pereopod dactyli III–VII ventrally with 1, occasionally 2 spiniform setae. Coxa VII with 2–4 posterior setae. Bases V–VII narrow with straight posterior margins, length/width = 0.50–0.65; pereopod VII 40– 50% of body length. Pleopods I–III with 2-hooked retinacles. Uropod I endopodite/exopodite length ratio = 0.90–1.05; endopodite distally with bunches of long setae. Male uropod III up to 45% of body length. Endopodite 40–50% of protopodite length; exopodite of uropod III rod-shaped. Endopodite distal article 40–55% of proximal article length in females, 40–100% in males.