FIGURE 6 in Toward a unified taxonomy of Niphargus (Crustacea: Amphipoda): a review of morphological variability

FIGURE 6. Mouthparts. Mandibles (A–F) vary mainly in the palpus (A: N. croaticus [after Jurinac 1888]; B: N. dalmatinus [original drawing]—note that left and right mandible are not symmetric, detailed lacinia mobilis is from N. tauri [after S. Karaman 1943b]; C: N. transitivus [after Sket 1971]; D: N. tauri [after S. Karaman 1943b]; E: N. skopljensis [after S. Karaman 1943a]; F: N. timavi—note setae on the proximal-most article; landmarks used in measurements are connected with lines [adapted from G. Karaman 1985]). Maxilla I (G–M) varies in number of setae on palpus and inner lobe as well as in type of spines on outer lobe (G: N. croaticus [after Jurinac 1888]; H: N. tauri [after S. Karaman 1943b]; I–J: N. velesensis [S. Karaman 1943a]; K: N. angelieri [after Ruffo 1953b]; L: N. skopljensis—spines on outer lobe [S. Karaman 1943a]; M: N. jovanovici [S. Karaman 1943a]). Maxilla II, labium and labrum are rather invariable (N, P, R: N. croaticus [after Jurinac 1888] O, Q, S: N. dalmatinus [original drawing]). Important characters on maxilliped (T: N. croaticus [after Jurinac 1888]) is the setal pattern on dactylus (U: N. krameri [after G. Karaman 1984b]; V: N. subtypicus, W: N. kolombatovici [adapted from Fišer et al. 2007]) and a number of flattened apical spines on inner lobes (X: N. tauri [S. Karaman 1943b]).