Southern sawtail catshark

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Southern sawtail catshark
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Subclass: Elasmobranchii
Subdivision: Selachimorpha
Order: Carcharhiniformes
Family: Scyliorhinidae
Genus: Galeus
Species:
G. mincaronei
Binomial name
Galeus mincaronei
Soto, 2001
Range of the southern sawtail catshark

The southern sawtail catshark (Galeus mincaronei) is a

oviparous, with females producing reddish egg capsules. The International Union for Conservation of Nature (IUCN) has assessed it as Vulnerable; it is often taken as bycatch and may be threatened by intensifying squid
fishing.

Taxonomy

The first known specimens of the southern sawtail catshark were caught in a series of experimental

type specimen is an adult male 40 cm (16 in) long.[2]

The southern sawtail catshark closely resembles G. antillensis, and with it belongs to the

pectoral fin margins. They recommended further study to resolve the status of the two species.[3]

Distribution and habitat

The only Galeus species in the southwestern

hard corals, sponges, crinoids, and brittle stars.[1][2]

Description

The largest known specimen of the southern sawtail catshark measured 43 cm (17 in) long.

pectoral fin bases.[2][3]

The first

dermal denticles, each has a crown bearing a horizontal ridge and three teeth on the posterior margin. A saw-like crest of enlarged denticles is present along the anterior half of the caudal fin dorsal edge. The dorsal coloration is reddish brown with a series of large oval blotches along either side of the back. The blotches are darker and outlined in white, and become less distinct towards the tail. The fins are dark, with or without lighter margins, and the underside is off-white. The inside of the mouth is blackish.[2][3][4]

Biology and ecology

The southern sawtail catshark shares its

oviparous. Adult females have a single functional ovary, on the right, and two functional oviducts; a single egg matures within an oviduct at a time. The egg is enclosed in a reddish vase-shaped capsule, measuring roughly 5–6 cm (2.0–2.4 in) long and 4 cm (1.6 in) wide. with coiled tendrils at the four corners.[2] Males and females reach sexual maturity at 36–38 cm (14–15 in) and 35–39 cm (14–15 in) long respectively.[1]

Human interactions

Significant, though unquantified, numbers of southern sawtail catsharks are

fisheries. Given its very limited range, its population may be threatened by increasing levels of squid fishing activity. The International Union for Conservation of Nature (IUCN) has therefore assessed this species as Vulnerable.[1]

References

  1. ^
    doi:10.2305/IUCN.UK.2020-3.RLTS.T44578A2995648.en
    . Retrieved 19 November 2021.
  2. ^ a b c d e f Soto, J.M.R. (2001). "Galeus mincaronei sp. nov. (Carcharhiniformes, Scyliorhinidae), a new species of sawtail catshark from southern Brazil". Mare Magnum. 1 (1): 11–18.
  3. ^ a b c d Rincon, G. & C.M. Vooren (2006). "Taxonomic and biological records on the south Atlantic marbled catshark, Galeus mincaronei Soto, (Elasmobranchii: Scyliorhinidae) off the Southern Brazilian coast". Pan-American Journal of Aquatic Sciences. 1 (1): 1–7.
  4. ISBN 978-0-691-12072-0
    .
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