BURGESS: FOUR NEW SPECIES OF SQUID ENOPLOTEUTHIS 



The suckers decrease in diameter distally, be- 

 come globular in shape, and have only three or 

 four blunt teeth. 



The tentacles are shorter than the mantle 

 (TLI 62.1-79.2-96A), very delicate and slender. 

 The stalk is laterally compressed, about a 

 third of the width of arm III. The club is not 

 expanded (Fig. IK). The carpus bears a series 

 of four or five suckers and four, five, or seven 

 pads, and the whole cluster is bordered by a 

 very low ridge on each side. The manus in- 

 cludes a dorsal row of three or four sheathed 

 hooks and a ventral row of four or five slightly 

 larger similarly sheathed hooks (Fig. ID). 

 These two rows are very close to each other. 

 Marginal suckers are absent. A medial sucker 

 or two may be present in series with the hooks 

 distally. The largest club hook is smaller than 

 any of the arm hooks. The dactylus of the club 

 is occupied by 11 to 17 suckers that are also 

 arranged in two rows. They have long stalks 

 and wide openings. The distal margin of the 

 inner sucker ring bears six or seven slender 

 blunt teeth and the outer sucker ring has 

 numerous pegs (Fig. 1C). Protective mem- 

 branes are absent. The aboral keel or dorsal 

 membrane is narrow and, at most, about half 

 the length of the club. The tip of the club is 

 rounded and bears a short hoodlike membrane 

 that conceals one or two of the suckers there. 



There are two types of light organs on the in- 

 tegument: Large dark ones with pearly white 

 centers and small white ones with very narrow 

 outer pigmented rings. These photophores range 

 in size from small (0.2 mm) to large (0.4 mm), and 

 they are randomly interspersed with each other. 

 The most distinctive feature of this species is the 

 unique arrangement of the mantle photophores. 

 Some of the rows are slanting or oblique (Fig. 

 1A), instead of the usual straight longitudinal 

 rows described in most other Enoploteuthis 

 species. Two median longitudinal rows (two to 

 three photophores in width), separated by an 



Figure I.— Enoploteuthis obliqua (A-F, K, and L from fe- 

 male paratype, ML (mantle length) 50 mm; other body parts 

 are from specimens as listed.) A, Ventral aspect; B, Dorsal 

 arm sucker; C, Tentacular sucker; D, Tentacular hook, oral 

 and lateral aspects; E, Dorsal arm hook, oral and lateral as- 

 pects; F, Eye and surrounding area; G, Mandibles: upper 

 (1), lower (2), male, ML 37 mm; H, Dorsal arm sucker, ex- 

 Alepisaums female, ML 50 mm; I, Radular teeth, male, ML 

 37 mm; J, Hectocotylus, male, ML 41 mm; K, Tentacular 

 club; L, Eye light organs; M. Section of spermatophore, 

 male holotype, ML 55 mm. 



intervening space lacking photophores, extend 

 from the anterior edge of the mantle to the pos- 

 terior tail. Photophores on the posterior part of 

 the mantle are scattered, those on the anterolat- 

 eral part are arranged in four oblique rows on 

 each side of the median longitudinal rows. Ex- 

 cept for the most posterior row, the oblique rows 

 radiate from the anterior edge of the mantle. The 

 edge of the mantle is lined by a transverse row 

 in which the photophores are closer to each other 

 ventrally than dorsally. A few isolated photo- 

 phores are present on the dorsal surface of the 

 mantle, none are present on the surface of the 

 fins. The tail has a single row on each side; a few 

 photophores occur on the ventral side, but none 

 are present on the dorsal side. 



Six groups of photophores occur on the funnel: 

 Two broad rows separated by a narrow midline 

 space on the ventral side; a short row of six or 

 seven light organs on each lateral margin (one or 

 two photophores are present in the space be- 

 tween these rows posteriorly); and a group of 

 photophores on each side of the bridles on the 

 dorsal side of the funnel. 



There are two patches of light organs, sep- 

 arated by a narrow space, in the apical region of 

 the funnel groove. Six rows are recognizable on 

 the ventral surface of the head, three rows on 

 each side of a narrow midline space devoid of 

 photophores. A row (two or three closely set 

 photophores in width) along the lateral edge of 

 the funnel groove extends anteriorly with in- 

 creased numbers of photophores medial to each 

 eye. It then bifurcates into two branches: one 

 branch extends along the ventral aboral border 

 of arm IV to a point opposite the last arm hook, 

 the other branch continues distally along the 

 base of the tentacular sheath to the tip of arm IV. 

 The next lateral row of the head photophores ex- 

 tends from near the first nuchal fold anteriorly, 

 although a short gap occurs opposite the lens of 

 the eye at the ventral window, along the head and 

 onto the edge of the tentacular sheath where it 

 continues to near the tip of arm IV. The lateral- 

 most row of the head extends from between the 

 second nuchal fold to the posterior margin of the 

 eye; it continues as a single row of closely set 

 photophores along the edge of the eyelid ven- 

 trally to the ventral edge of the optic sinus (Fig. 

 IF). The dorsal edge of the eyelid is devoid of 

 light organs. From the dorsal edge of the optic 

 sinus the row proceeds along the base of the 

 swimming keel of arm II almost to the tip of the 

 arm. Some small white photophores occur near 



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