Histioteuthis oceaniRichard E. Young and Michael Vecchione
Histioteuthis oceani is one of three species of histioteuthids that has tubercles. It is found throughout much of the tropical Pacific but records are few.
- Arms I with 25-36 tubercules; arms II with 23-30 tubercules and arms III with 17-21.
- Length of tubercule-rows 46-83% of arm lengths.
- Arms IV with 6 longitudinal series on arm base in first 1-3 diagonal rows then decreases to 5 series distally.
CommentsMore details of the description can be found here.
Species of the miranda-group are distinguished by the following characteristics:
- Present on dorsal midline of mantle and aboral surfaces of arms I-III.
- In 5-6 series on arm IV base.
- Compound photophores of uniform, medium size on anterior 3/4 of ventral mantle.
H. oceani is most easily separated from the other member of the miranda-group, H. miranda, by (1) the greater number of photophores on the base of arms IV (6 vs 5), (2) the greater number of tubercles on each arm, (3) the greater length of the tubercle rows on the arms, and the undivided buccal connectives to arms II.
The above data are from Voss, et al. (1998).
Largest known female is 70 mm ML (immature); only known mature male is 50 mm ML (Voss et al., 1998). Maturity-related photophores were not found in these specimens. Young H. oceani of 12 mm ML have well-developed tubercules (Voss et al., 1998).
During a study of vertical distribution off Hawaii, Two captures of H. oceani were made during the day at depths of 575 and 665 m. Four night captures were made from 165-275 m.
Figure. Vertical distribution chart of H. oceani, Hawaiian waters. Captures were made with both open and opening/closing trawls. Bars - Fishing depth-range of opening/closing trawl. Circle - Modal fishing depth for either trawl. Square - Midpoint of trawl where no modal depth was present. Blue color - Night captures. Yellow color - Day captures.
Type locality: Eastern Tropical Pacific, SE of the Galapagos, 2°33'S, 89°44'W. H. oceani is known from relatively few localities spread across the tropical Pacific. A few records of squid of uncertain identity that may belong to this species, however, are also known from the Indian Ocean (Voss, et al, 1998).
Voss, N. A. 1969. A monograph of the Cephalopoda of the North Atlantic: The family Histioteuthidae. Bull. Mar. Sci., 19: 713-867.
Voss, N.A., K. N. Nesis, P. G. Rodhouse. 1998. The cephalopod family Histioteuthidae (Oegopsida): Systematics, biology, and biogeography. Smithson. Contr. Zool., 586(2): 293-372.
Young, R. E. 1978. Vertical distribution and photosensitive vesicles of pelagic cephalopods from Hawaiian waters. Fish. Bull., 76: 583-615.
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Young, Richard E. and Michael Vecchione. 2000. Histioteuthis oceani http://tolweb.org/Histioteuthis_oceani/19807/2000.01.01 in The Tree of Life Web Project, http://tolweb.org/. Version 01 January 2000 (under construction).