Coral catshark

Appearance

The coral catshark has a very slender, cylindrical, firm body and a short, narrow head. The snout is short and slightly flattened, with a blunt tip. The eyes are horizontally oval and protected by rudimentary nictitating membranes; behind are spiracles of moderate size. The large nostrils are mostly covered by broad, triangular flaps of skin on their anterior margins, leaving small incurrent and excurrent openings. The nasal flaps reach the mouth, obscuring a pair of broad grooves connecting the excurrent openings and the mouth. The long, angular mouth has very long furrows at the corners extending onto both the upper and lower jaws. The small teeth have a narrow central cusp flanked by 1–2 cusplets on both sides. There are five pairs of gill slits.

The pectoral fins are fairly large. The first dorsal fin is angled backwards and originates over the rear of the pelvic fin bases; the second dorsal fin is similarly shaped and slightly smaller than the first, and originates over the front quarter of the anal fin base. Adult males have thin, tapering claspers that extend about two-thirds of the distance between the pelvic and anal fins. The anal fin is much smaller than the dorsal fins. The caudal fin is relatively short and broad, with an indistinct lower lobe and a ventral notch near the tip of the upper lobe. The skin is thick and covered by well-calcified dermal denticles. Extremely variable in coloration, the coral catshark lacks prominent saddle markings but rather has many black and white spots on a grayish background. These spots often run together to form horizontal dashes, which include white tips on the dorsal fins and a white stripe through the gill slits. The underside is plain white. This species grows up to 70 cm long.

Distribution

The most widely distributed member of its genus, the coral catshark can be found from Pakistan and India to Southeast Asia and Taiwan, including the Philippines and New Guinea. Its range extends as far north as the Ryukyu Islands. Early records from Australian waters are in fact of the related Australian marbled catshark and banded sand catshark ''. Common and bottom-dwelling in nature, the coral catshark inhabits inshore coral reefs at depths not exceeding 15 m .

Behavior

The elongated body of the coral catshark allows it to move into and through small spaces in the reef environment, though it does not "crawl" using its pectoral and pelvic fins like the epaulette shark . It is primarily crepuscular and nocturnal, with active foraging activity beginning in the afternoon and ending before sunrise. During the day, it generally hides under shelter such as reef overhangs or sunken logs, either singly or in groups. Individual sharks may return to the same hiding place on successive days. This species feeds on small benthic invertebrates and bony fishes; captive specimens have been observed lying still and lunging at prey that come into range.

The coral catshark is oviparous, with the female producing eggs two at a time. Each egg is enclosed in a purse-shaped capsule roughly 6–8 cm long and 2 cm wide, with two constricted "waists"; one end of the capsule is squared off while the other bears two short "horns" that may terminate in short tendrils. The female deposits the eggs on the bottom, rather than attaching them to vertical structures. The capsule is light brown when freshly laid and darkens over time. The eggs hatch in 4–6 months at 26 °C . Newly hatched sharks measure 10–13 cm long and have a contrasting dorsal pattern of light and dark vertical bars, sometimes with black and white dots. At three months old, the young have grown by 4–5 cm and their coloration has faded to match that of the adults. Males and females attain sexual maturity at around 47–62 cm and 49–57 cm respectively.

Habitat

The most widely distributed member of its genus, the coral catshark can be found from Pakistan and India to Southeast Asia and Taiwan, including the Philippines and New Guinea. Its range extends as far north as the Ryukyu Islands. Early records from Australian waters are in fact of the related Australian marbled catshark and banded sand catshark ''. Common and bottom-dwelling in nature, the coral catshark inhabits inshore coral reefs at depths not exceeding 15 m .The elongated body of the coral catshark allows it to move into and through small spaces in the reef environment, though it does not "crawl" using its pectoral and pelvic fins like the epaulette shark . It is primarily crepuscular and nocturnal, with active foraging activity beginning in the afternoon and ending before sunrise. During the day, it generally hides under shelter such as reef overhangs or sunken logs, either singly or in groups. Individual sharks may return to the same hiding place on successive days. This species feeds on small benthic invertebrates and bony fishes; captive specimens have been observed lying still and lunging at prey that come into range.

The coral catshark is oviparous, with the female producing eggs two at a time. Each egg is enclosed in a purse-shaped capsule roughly 6–8 cm long and 2 cm wide, with two constricted "waists"; one end of the capsule is squared off while the other bears two short "horns" that may terminate in short tendrils. The female deposits the eggs on the bottom, rather than attaching them to vertical structures. The capsule is light brown when freshly laid and darkens over time. The eggs hatch in 4–6 months at 26 °C . Newly hatched sharks measure 10–13 cm long and have a contrasting dorsal pattern of light and dark vertical bars, sometimes with black and white dots. At three months old, the young have grown by 4–5 cm and their coloration has faded to match that of the adults. Males and females attain sexual maturity at around 47–62 cm and 49–57 cm respectively.