11 from Argentina (215.2-353.2 mm SL), FAKU 42796-42799, 43042-43047; AP 740.
Description:
D 77-89; A 60-69; P110-12; P2 T, 5; GR 4-6+10-12=14-17; BR 7; LLS 80-89.
HL 23.1-26.3% of SL; ED 2.8-3.5; BD 42.9-48.1; SN 4.3-5.5; IO 0.6-1.5; UJ 8.4-10.8; CP 10.6-11.2; P1L 15.5-19.9; P2L 6.4-8.4; DH 10.7-11.9; AH 10.8-11.5.
Body elliptical, well depressed. Body depth about 2.3 times in SL. Head slightly larger than half body depth. Small depression above pupil of upper eye on dorsal margin of head. Snout short, about equal to eye diameter. Mouth large, upper jaw extending to below middle of lower eye. Fine conical teeth on both jaws arranged into a single row. No teeth on vomer or palatines. Nostrils small and round, anterior nostril with a small papilla; posterior nostril without it on ocular side. Small cycloid scales on both sides of body except on upper surface of eye, jaw, snout and interorbital region. Fine cycloid scales on fin rays of all fins, especially dorsal and anal fins. Dorsal fin origin above anterior margin of eye. Anal fin origin just posterior to anus, below pectoral fin origin. No rays branched in dorsal and anal fins. Pectoral fin long, its length about 4/5 of HL on ocular side and short, 1/2 of HL on blind side. Middle rays on caudal fin longest. Lateral line single, running from above postorbital to caudal base, curving upward at around pectoral fin origin on ocular side, and running from behind dorsal fin origin with a small curve above pectoral fin origin on blind side. Dark spots on ocular side irregularly and two dark small spots at end of both dorsal and anal fin bases on blind side symmetrically.
Distribution:
Coasts of Atlantic South America, Brazil to Argentine Patagonia.
Remarks:
Verecundum given to this species first, then Norman (1934) proposed to adopt Xystreurys to this species.