Iridoteuthis irisRichard E. Young and Michael Vecchione
I. iris is a small heteroteuthin (28 mm ML) with a broad dorsal head/mantle fusion and unusually large fins, eyes and ventral shield. It is known only from Hawaiian waters where it appears to be a member of the mesopelagic boundary fauna and occurs over bottom depths of about 350 - 450 m (Young, 1995).
A heteroteuthin ...
- with mantle broadly fused to head dorsally.
- with enlarged suckers on arms I and III in males.
- Arms I in males not strongly modified; some enlarged suckers on arms I and III or arms II and III.
- Enlarged dorsal keels at tips of arms I-III.
- Tips of arms III and IV in females with elongate trabeculae.
- Funnel locking-apparatus with deep, curved, anterior pit.
- Dorsal mantle broadly fused to head (fusion nearly reaches posterior midpoints of eyes).
- Ventral-mantle shield large (ca. 80% of ventral mantle length); extends nearly to anterior margin of eyes; with medial anterior indentation.
- Mantle with middorsal arch.
- Fins with pointed posterior lobes; extend to posterior margin of mantle.
These characteristics are from Harman and Seki (1990).
Harman, R. F. and M. P. Seki. 1990. Iridoteuthis iris (Cephalopoda: Sepiolidae): New records from the central North Pacific and first description of the adults. Pac. Sci. 44: 171-179.
Young, R. E. 1995. Aspects of the natural history of pelagic cephalopods of the Hawaiian mesopelagic-boundary region. Pacific Science 49: 143-155.
Richard E. Young
Dept of Oceanography
University of Hawaii
Honolulu, Hawaii 96822
National Marine Fisheries Service
National Museum of Natural History
Washington, D. C. 20560
Page copyright © 1996 Richard E. Young and
Citing this page:
Young, Richard E. and Vecchione, Michael. 1996. Iridoteuthis http://tolweb.org/Iridoteuthis_iris/20032/1996.01.01 in The Tree of Life Web Project, http://tolweb.org/. Iridoteuthis iris . Version 01 January 1996 (under construction).