Not just a
huge collection of
Elasmodiver.com contains images of sharks, skates, rays, and a few
chimaera's from around the world. Elasmodiver began as a simple web
to help divers find the best places to encounter the different
species of sharks and rays that live in shallow water but it has
slowly evolved into a much larger project containing information on
all aspects of shark diving and shark photography.
now more than 10,000 shark pictures and sections on shark
evolution, biology, and conservation. There is a large library of
reviewed shark books, a constantly updated shark taxonomy page, a
monster list of shark links, and deeper in the site there are
numerous articles and stories about shark encounters. Elasmodiver is
now so difficult to check for updates, that new information and
pictures are listed on an Elasmodiver Updates Page that can be
The roughskin spurdog is a fairly stout squaloid shark with a
greyish-brown upper body and a pale belly. It has two dorsal fins with long
anterior spines. First dorsal fin originates posterior to free rear tip of
pectoral fin. Second dorsal almost as large first. Spine on second dorsal fin
more curved than spine on first dorsal fin. All fins have white trailing edges.
The white margins are more pronounced on the dorsal fins and lower caudal lobe.
Pectoral fins broad.
Commonly to 90cm but may exceed 118cm
Continental slopes from 73-600m.
Abundance and distribution: A wide ranging
species. Reported from the western Indian Ocean, Hawaii, western North Atlantic
and the Gulf of Mexico. Common at 200-300m off South Carolina.
Status: The roughskin spurdog is listed as Data Deficient by the IUCN.
Compagno (in prep. a) reports that this species is probably taken as bycatch in
demersal trawl and deepwater longline fisheries in some parts of its range,
including in the Western Atlantic and Western Indian Oceans. Though, like the
bycatch of most other deepwater chondrichthyans, specific data is not available.
Also reported to be occasionally caught by inshore line fisheries in the Eastern
Cape, South Africa (Compagno in prep. a).
Largely unknown but one dissected individual had squid in its
Ovoviviparous - aplacental viviparity. Litter size
21-23 (based on a small selection of gravid females). Observations of vastly
different sized broods collected at the same time of year indicate gestation
probably lasts for two years like some other deepwater squalids.
Quetzalito, Gulf of Guatemala, Caribbean Sea.
The roughskin spurdog is the only dogfish on the
east coast of North America wiith white margins on all of its fins. The
has a longer
nose and usually displays scattered white spots.
spurdog Squalus blainville (present in the Mediterranean and along the
west coast of Africa) has a much longer laterally pointed nose, white margined
fins and a thicker more robust first dorsal spine.