Longfin sawtail catshark
| Longfin sawtail catshark | |
|---|---|
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Subclass: | Elasmobranchii |
| Subdivision: | Selachimorpha |
| Order: | Carcharhiniformes |
| Family: | Scyliorhinidae |
| Genus: | Galeus |
| Species: | G. cadenati
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| Binomial name | |
| Galeus cadenati S. Springer, 1966
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| Range of the longfin sawtail catshark | |
The longfin sawtail catshark (Galeus cadenati) is a rare, little-known
oviparous
.
Taxonomy
Renowned shark expert
Distribution and habitat
The longfin sawtail catshark does not co-occur with either G. arae or G. antillensis.continental slope, at depths of 431 to 549 m (1,414 to 1,801 ft).[6]
Description
The longfin sawtail catshark reaches a maximum known length of 35 cm (14 in), smaller than G. antillensis and comparable to G. arae.pectoral fin bases.[2]
The two
dermal denticles, each with a leaf-shaped crown bearing a horizontal ridge and three marginal teeth. A series of enlarged denticles form an obvious saw-toothed crest along the anterior dorsal edge of the caudal fin. This species is brownish above, with a marbled pattern of darker saddles and blotches along the body and tail that become indistinct past the origin of the first dorsal fin. The underside is uniformly light, and the inside of the mouth is dark.[2][5]
Biology and ecology
Little is known of the natural history of the longfin sawtail catshark. Reproduction is
oviparous; mature females have a single functional ovary, on the right, and two functional oviducts. A single egg matures within each oviduct at a time. The egg is enclosed within a flask-shaped capsule roughly 4.9–5.1 cm (1.9–2.0 in) long, 1.2–1.4 cm (0.47–0.55 in) across the top, and 1.6 cm (0.63 in) across the bottom; there are coiled tendrils at the upper two corners. Females mature at about 29–34 cm (11–13 in) long; adult males are unknown and the largest known immature male measured 29 cm (11 in) long.[5]
Human interactions
The longfin sawtail catshark may be
bottom trawls meant for shrimp, though no specific information is available. Its small range potentially renders it susceptible to overfishing. The International Union for Conservation of Nature (IUCN) has listed this species as least concern.[1]
References
- ^ . Retrieved 19 November 2021.
- ^ a b c d Springer, S. (1966). "A review of western Atlantic cat sharks, Scyliorhinidae, with descriptions of a new genus and five new species". United States Fish and Wildlife Service Fishery Bulletin. 65 (3): 581–624.
- ^ Springer, S. (April 1979). A revision of the catsharks, family Scyliorhinidae. NOAA Technical Report NMFS Circular No. 422: 1–15
- doi:10.2307/1447711.
- ^ .
- ^ ISBN 978-0-691-12072-0.