280 
C.C. Lu, A. Reid 
Figure 2 A-B, Sepia plana sp. nov.; A, dorsal view, female paratype MV F67700, 127.1 mm ML, ventral view same 
specimen. Scale bars 15 mm. 
Additional material 
Australia: Queensland - cuttlebone (broken). 
Lizard. Island, 14°40'S 145°28'E, Nov 1989, coll. M. 
Norman, (MV 77203). 
Diagnosis 
Cuttlebone strongly angular, flat medially and 
laterally; dorsal surface slightly granulose; 
dorsal median rib indistinct; spine very short; 
striated zone and last loculus flat; anterior 
striae broad inverted U-shape; limbs of inner 
cone narrow, broaden only slightly posteriorly. 
Tentacular club with 8-10 similar-sized small 
suckers in transverse rows; swimming keel 
extends beyond carpus; dorsal and ventral 
protective membranes not fused at base of club, 
joined to stalk. Left ventral arm of males 
hectocotylised: proximal 8 rows of suckers 
reduced, suckers in dorsal marginal series 
slightly smaller than remaining suckers. Arm 
suckers all tetraserial. Large robust species, 
maximum size to approximately 150 mm ML. 
Description 
Counts and indices for individual specimens are 
given in Table 2; ranges for arm length indices, 
arm sucker diameter indices and arm sucker 
counts are shown in Table 3. 
Large, robust species; ML male 99.3 mm, females 
84.4- 122.3 -151.2 mm (SD, 29.5). Mantle broad, 
oval, MWI male 57.4, females 54.8-57.7-63.3 (SD, 
3.4); dorsal anterior margin rounded (Figure 2A); 
extending anteriorly beyond eyes; AMHI male 
16.8, females 12.2-14.8-17.3 (SD, 2.4). Ventral 
mantle margin slightly emarginate, without distinct 
lateral angle (Figure 2B); VMLI male 90.8, females 
78.4 - 86.9 -94.4 (SD, 7.3). Fins widest in posterior 
third; FWI male 13.8, females 7.4-9T-10.9 (SD, 1.4); 
anterior origin posterior to mantle margin, set well 
back from margin; Flla male 14.4, females 8.9 -12.7- 
16.4 (SD, 3.5); rounded posteriorly; wide gap 
between fins. Flip male 9.3, females 9.9 -11.9 -14.4 
(SD, 2.1). Funnel short; FuLI male 38.3, females 
28.6- 31.9 -35.7 (SD, 3.2), robust, very broad; 
extends to anterior rim of eye. Funnel free portion 
