Hymenocephalus sp. 1

Schwarzhans, Werner, 2014, Head and otolith morphology of the genera Hymenocephalus, Hymenogadus and Spicomacrurus (Macrouridae), with the description of three new species, Zootaxa 3888 (1), pp. 1-73 : 66

Hymenocephalus sp. 1

Figs. 36A–C , 37

Material examined. 1 specimen MNHN 2006-0556 , included in a jar of 20 specimens identified as H. longiceps , 08°16’S, 160°04’E, 430 m.

Description. Otolith large; OL:OH = 1.05; OH:OT = 2.7. Dorsal rim with short, broad, rounded, smooth predorsal lobe, distally with small indentation; posterior tip broadly rounded; ventral rim moderately deep, regularly curved, smooth, deepest at about its middle; anterior rim high, broadly rounded. Inner face slightly convex, with slightly supramedian sulcus. Ostial and caudal colliculi small, short, very narrowly placed at collum, terminating at considerable distance from anterior and posterior tips of otolith; pseudocolliculum short. CCL:OCL = 1.0; TCL:PCL = 2.1. Dorsal indistinct; ventral furrow thin, close to ventral rim.

Discussion. This otolith morphology is clearly similar to the pattern found in the two species of the longibarbis Group, but differs in the regularly curved outline with the small predorsal lobe and thus could well represent an undescribed species.

Figures

FIGURE 36. A–C: Hymenocephalus sp. 1, MNHN 2006-0556, otolith, A—Anterior view, B—Inner face, C—Ventral view. D–F: Hymenocephalus sp. 2, USNM 149049, D—Anterior view, E—Inner face, F—Ventral view.

FIGURE 37. Geographical distribution of Hymenocephalus aeger, H. megalops, H. striatissimus, H. torvus, H. grimaldii, H. neglectissimus, H. semipellucidus, H. sp. 1 and H.