Anchovy

Stolephorus bataviensis Hardenberg, 1933

USNM 217030, Fly 75–32, 2: 26.6–41.4 mm.

This species was kindly identified by T. Wongratana.

Thryssa scratchleyi (Ramsay and Ogilby, 1887)

USNM 217031, Fly 75–4, 3: 251–371 mm.

USNM 217032, Fly 75–5, 5: 246–285 mm.

USNM 217033, Fly 75–6, 3: 196–301 mm.

USNM 217034, Fly 75–18, 1: 208 mm.

USNM 217035, Fly 75–25, 4: 94.4–109 mm (1 to BMNH).

USNM 217036, Fly 75–30, 1:111 mm.

Five species of Thryssa were collected during the 1975 Fly survey, two of which are undescribed. In assigning these species to Thryssa Cuvier, 1829 (type-species Clupea setirostris Broussonet, 1782, by subsequest designation of Jordan, 1917; see Whitehead, 1967:140–141), I am following the advice of Whitehead and Wongratana (in litt.), who are currently engaged in revisionary studies of Engraulidae. Only T. scratchleyi and T. rastrosa are present in the Upper and Middle Fly.

Thryssa scratchleyi is of interest for its large size, being the largest member of the family Engraulidae, and because it may have a catadromous life history. Large adults are common in the Upper, Middle, and Lower Fly; the largest specimen known is 371 mm (Fly 75–4). Adults are piscivorous. Lower jaw relatively long, extending anteriorly almost to tip of snout, but maxillary bone not extending posteriorly beyond opercle. Diameter of eye 16.0–17.2. Gill rakers on anterior face of first gill arch 15–18 + 18–20 in specimens over 90 mm; 5–6 gill rakers on posterior face of third gill arch. Total anal fin rays 38–42. Scales in lateral series 43–44. Abdominal scutes 17–19 + 10–12. Tips of pelvic fins extending posteriorly beyond a vertical line through origin of dorsal fin. Free vertebral centra 43–46. Length of caudal peduncle 10.2–10.3. No humeral pigment blotch. No nuchal pigment blotch.