Promachoteuthis sp. ARichard E. Young and Michael Vecchione
Promachoteuthis sp. A is known from two specimens: the smaller holotype, an immature female 58 mm ML and a paratype, an immature female, 102 mm ML. The paratype was captured by the R/V WALTER HERWIG in 1973 while the holotype was captured by the R/V G.O. SARS in 2004 and was in near-perfect condition. Both were taken from the North Atlantic in nets that fished to depths greater than 2,000 m. Virtually nothing is known of their biology.
A Promachoteuthis ...
- without nuchal fusion between head and mantle.
- with mostly 3-4 series of suckers on arms.
- with papillae on tentacles.
- Arms with three or four rather irregular suckers series in mid-region sometimes appearing as up to six series.
- Tentacles thick at base (slightly thicker than adjacent arms); club not flattened; club) about 60% of tentacle length.
- Each tentacle with two series of long papillae near oral midline at tentacle base but diverging to be lateral to club; papillae often with stubby branches in holotype but become flattened, highly branching or merge into a complex membrane in the paratype.
- Darkly pigmented ridges present along the lateral margins of the aboral surface of each tentacle; distally the ridge breaks into small papillae. Pigmented ridges in paratype less prominent and restricted to middle third of tentacle.
- Head extremely small with very small eyes buldging laterally from reduced head.
- Eyelid forming a small, circular opening.
- Eyelid over lens opaque but with, apparently, a somewhat clearer central region.
- Anterior mantle-margin free from the head. A nuchal cartilage is present.
- Fins large; large anterior lobes present; posterior lobes absent in holotype but small, distinct posterior lobes present in paratype.
Figure. Oral view of the midregion of a lateral arm of Promachoteuthis sp. A, holotype, preserved.
Promachoteuthis sp. A is very distinctive and easily separated from other members of the genus by the peculiar tentacles among many other features.
Type locality - Central North Atlantic at 53°05’N, 36°46’W (R/V G.O.SARS MARECO cruise super station 14, local station 341)in an trawl that fished to a maximum depth of 2792 m in 2004. Paratype came from the Eastern North Atlantic at 46°00'N, 15°49'W (R/V WALTER HERWIG station 714) in a trawl that fished to 2650 m.
Toll, R. B. 1998. The gladius is teuthoid systematics. Smithson. Contr. Zool., No. 586: 55-68.
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 © 2003 Richard E. Young and
Citing this page:
Young, Richard E. and Vecchione, Michael. 2003. Promachoteuthis sp. A. Version 01 January 2003 (complete). http://tolweb.org/Promachoteuthis_sp._A/19529/2003.01.01 in The Tree of Life Web Project, http://tolweb.org/