Promachoteuthis sulcusRichard E. Young and Michael Vecchione
Promachoteuthis sulcus (first known as Promachoteuthis sp. C on this page) is known from a single, small (25 mm ML, sex unknown) but distinctive individual from great depths in the south Atlantic Ocean.
Brief diagnosis:A promachoteuthid...
- with nuchal fusion between head and mantle.
- with arm suckers much larger than club suckers.
- with tentacle base wider than arm base.
- with recessed club base and aboral tentacle groove.
- Arm suckers much larger than club suckers.
- Suckers in three series on all arms. Click on an image to view larger version & data in a new window
Figure. Oral view of brachial crown of P. sulcus, holotype. The squid seems to have a set of dentures. The "dentures" are the circular, folded lips, of which only the upper and lower portions can be seen. The lips surround the beaks which are not visible in this photograph. Photograph by R. Young.
- At base tentacle thick, about 2x diameter of arm III.
- Tentacle stalk with deep groove on aboral surface.
- Club suckers tiny (0.014 mm diam), in numerous irregular rows.
- Sucker-bearing club recessed at tapering, proximal end; surrounding lateral and aboral tissue with thick folds.
- Tentacles heavily pigmented at base but not forming a well-defined band.
- Head fused to mantle in nuchal region.
- Fins terminal with anterior and posterior lobes. Each fin approximately circular in outline.
CommentsMore details of the description of P. sulcus can be found here.
Clubs were slightly abraided so the number of suckers in a transverse series could not be determined. The largest number of those present was 12 suckers across. The specimen is an immature female. The mantle was cut open prior to fixation by a previous investigator. The label in the specimen jar states that the ML is 40 mm; the squid currently measures 25 mm ML.
Type locality: 36°49'S, 12°17'W off Tristan Da Cunha, south Atlantic Ocean. Captured from WALTHER HERWIG at 1750-2000 m depth (open net).
Young, R. E., M. Vecchione and C. F. E. Roper. 2007. A new genus and three new species of decapodiform cephalopods (Mollusca: Cephalopoda). Rev. Fish. Biol. Fisheries, 17: 353-365.
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- Content changed 15 November 2007
Citing this page:
Young, Richard E. and Michael Vecchione. 2007. Promachoteuthis sulcus http://tolweb.org/Promachoteuthis_sulcus/19531/2007.11.15 in The Tree of Life Web Project, http://tolweb.org/. Version 15 November 2007.