Carcharhinus falciformis

FamilyScientific NameAuthorYearCommon Name
CarcharhinidaeCarcharhinus falciformis(Mùˆller and Henle)1839Silky Shark

All Carcharhinus — Upper labial folds short to rudimentary, almost vertical at mouth corners. Spiracles usually absent. Lateral keels usually absent. Second dorsal fin considerably smaller than first, height 0.2-0.5 times first dorsal-fin height. Midlength of first dorsal-fin base usually closer to pectoral-fin insertions than to pelvic-fin origins, sometimes equidistant between pectoral and pelvic-fin bases. No gill rakers. Back grey, blue-grey, or brownish. Preanal ridges very short or absent.

Carcharhinus falciformis

Unique Characters: Pectoral and first dorsal fins tapering distally and usually pointed or narrowly rounded. Fins not mottled white, often black tipped but without black saddles on the caudal peduncle. Interdorsal ridge present. Very coarse serrations or small cusplets on feet of upper anterolateral teeth. First dorsal-fin origin well behind pectoral-fin free rear tips. Inner margin of second dorsal fin very long, usually over twice fin height but occasionally down to 1.6 times fin height.

Similar Species:

Sandbar Shark
Carcharhinus plumbeus

Dusky Shark
Carcharhinus obscurus

Carcharhinus plumbeus
Sandbar Shark – Carcharhinus plumbeus Photo Credit: G.W. Link
Dusky Shark - Carcharhinus obscurus
Dusky Shark – Carcharhinus obscurus

Sandbar Shark Carcharhinus plumbeus. Pectoral and first dorsal fins tapering distally and usually pointed or narrowly rounded. Fins not mottled white, often black tipped but without black saddles on the caudal peduncle. Interdorsal ridge present. Serrations on feet of upper anterolateral teeth small and fine. First dorsal-fin origin over or anterior to pectoral-fin free rear tips. Inner margin of second dorsal fin shorter and generally less than twice fin height. First dorsal-fin origin in front or over pectoral-fin insertions or at least nearer to the pectoral-fin insertions than to pectoral-fin free rear tips.

Dusky Shark Carcharhinus obscurus. Pectoral and first dorsal fins tapering distally and usually pointed or narrowly rounded. Fins not mottled white, often black tipped but without black saddles on the caudal peduncle. Interdorsal ridge present. Serrations on feet of upper anterolateral teeth small and fine. First dorsal-fin origin over or anterior to pectoral-fin free rear tips. Inner margin of second dorsal fin shorter and 2.1 times in fin height. First dorsal-fin origin opposite or somewhat in front of pectoral-fin rear tips but closer to them than pectoral-fin insertions.

Gallery