Sepia ramani   Neethiselvan,  2001 (Cuttlefish)
Organism information awaits expert curation
Taxonomy
Kingdom:Animalia
Phylum:Mollusca
Class: Cephalopoda
Order:Sepiida
Family:Sepiidae

Image copyrights: Council of Scientific and Industrial Research

Description
Size: Dorsal mantle length 10.5-37.5 cm

Color: Conspicuous transverse tiger-stripes on dorsal side of mantle, head and arms, much prominent in male than female, body brown with distinct stripes in live condition, coloration gets faded after death and on preservation in ice, color turns greenish yellow, color pattern variable.

Mantle robust, oval in outline and elongate, broadest in upper half, mid dorsal part of mantle in anterior end produced into a triangular lobe. Fin muscular, anterior tip of fin produced as a broad, triangular projection. Fins extend along entire margin and wide near the posterior end, a narrow white line along the base of the fins demarcating mantle and fin, fin starts from anterior margin of mantle or slightly below. Funnel large, stout and thick walled, reaches almost base of ventral arm, funnel locking apparatus consists of a short curved groove, rounded anteriorly and pointed posteriorly, a short ridge on mantle highest in the middle, funnel valve large, rounded and triangular. Head prominent, short and about as long as inter orbital width; eye prominent. Arms subequal, decrease in length in the order of 4, 3, 2, and 1, and stout at base, I and II arm rounded, III arm slightly flattened and ventral arms (IV) long with well developed keels and tapering ends, suckers in four rows throughout and have horny rings with vertical sides, suckers in basal rows larger and gets gradually reduced in size towards distal end, those at tips very minute, arms relatively soft in female. Left ventral arm in males hectocotylised, basal 14-16 transverse series of suckers normal in size, hectocotylised part with 7-10 series of minute suckers in two dorsal rows and normal suckers in two ventral rows, dorsal and ventral rows of suckers in hectocotylised portion separated by fleshy transverse ridge. Tentacles very long, longer than body, tentacular stem thick and triangular in cross section, tentacular clubs slender and elongate, swimming membrane at anterior end not remarkably broad and it gradually tapers towards posterior end, protective membranes on either side narrow, extend slightly beyond carpus and not united at base, club elongate with 100-140 suckers of unequal size. Suckers of carpus and dactylus portions small, 15-24 enlarged suckers almost subequal in size, sucker rings with wavy end without denticulation. Buccal membrane thick and lappets bear minute suckers at tip, rostrum of horny beak dark colored, embedded in buccal mass seen in middle.
Cuttlebone elongate, slenderly elliptical in shape, dorsal surface convex, rugose in texture having three longitudinal faint ribs, chitinous outer edges on dorsal side broad and pale yellowish brown, margin of chitinous part with narrow transparent rim, ventral surface of cuttlebone has a wide, deep, longitudinal groove in middle, running along entire length of striated zone, striae of growth lines distinctly inverted ā€˜Vā€™ shaped with undulations, inner cone relatively short, inner cone with plate-like callosity without any cavity, spine short, stout and without any keel, shell of female slightly broader than that of male.


Synonym (s)

Common Name (s)
Economic Importance and Threats

Ecology
Habitat:  Demersal

Biogeography


• Tamil Nadu, Tuticorin INDIA (Record: 15/11/1999)

Literature Source(s)
  • Neethiselvan, N (2001) A new species of cuttlefish Sepia ramani sp. nov. (Class: Cephalopoda) from Tuticorin Bay, southeast coast of India Indian Journal of Marine Sciences 30(2) 81-86 Available at - http://nopr.niscair.res.in/bitstream/123456789/4605/1/IJMS%2030%282%29%2081-86.pdf
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • Sealifebase Available at - http://www.sealifebase.org/

Page last updated on:2011-05-03

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