Mastigoteuthis cordiformisRichard E. Young and Michael Vecchione
The original description of M. cordiformis is based on a single male squid, 80 mm ML with intact tentacles, taken in the Indian Ocean near Sumatra. It has been subsequently described from Japan (Sasaki, 1929) and the Philippines (Voss, (1963). This is the largest of the mastigoteuthids reaching a size of 100 cm ML (A. Salcedo-Vargas, personnal communication).
A mastigoteuthid ...
- without photophores.
- with club bearing very large suckers (ca. 0.5 mm) at proximal end.
- with skin tubercules.
- Tentacular club not expanded (slightly expanded according to Sasaki, 1929, and Voss, 1963), with narrow, trabeculate protective membranes (Chun, 1910).
- Club suckers gradually decrease in size toward tip (Chun, 1910); very large suckers (for a mastigoteuthid club) present at proximal end of club.
- Club with well-developed (for a mastigoteuthid) trabeculate protective membranes.
- Mantle and other skin covered with small, conical tubercules.
- Photophores absent
- Fin length (anterior extent to insertion on tail) 75% of ML; fin width 72% of ML (Chun, 1910).
Figure. Oral view of the tentacular club of M. cordiformis. Note the large suckers at the proximal end. Top - Holotype. Photograph by R. Young. Bottom - Large specimen (>30 cm ML), fresh, Australian waters. Photograph by Mark Norman.
Figure. Left - Ventral view of a portion of the eyelid of M. cordiformis, holotype, showing tile-like arrangement of tubercules. Photograph by R. Young. Right - Scanning electron micrograph with an external view of mantle tubercles of M. cordiformis, 87 mm ML, Philippine waters, 14°N, 121°E. The tubercules are very similar to those of M. hjorti. Photograph from Roper and Lu (1990).image infoimage info
Figure. Left - Histological section through a skin tubercule of M. cordiformis, holotype. Most of the epithelium has been lost except along one flank of the tubercule. Drawing from Chun (1910). Right - Cross-section through a tubercule of M. cordiformis using scanning electron microscopy. Photograph from Roper and Lu (1990).
The descriptions of Chun, Sasaki and Voss contain differences in the shape of the funnel locking-apparatus and the structure of the suckers. The significance of these differences remains to be determined. M. latipinna Sasaki, 1916 (see description under "Species of doubtful validity..." in the Nomenclature section of the family page) is probably a junior synonym of M. cordiformis.
M. cordiformis is most similar to M. hjorti but differs in the absence of ocular photophores and the presence of enlarged proximal club suckers among other features.
Type locality: Indian Ocean south of Sumatra at 0°15'N, 98°8'E. Also known from southern Japanese (Sasaki, 1929) and Philippine (Voss, 1963) waters.
Chun, C. 1910. Die Cephalopoden. Oegopsida. Wissenschaftliche Ergebnisse der Deutschen Tiefsee Expedition auf dem Dampfer "Valdivia" 1898-1899, 18(1):1-401.
Roper, C.F.E. and C.C. Lu 1990. Comparative morphology and function of dermal structures in oceanic squids (Cephalopoda). Smithson. Contr. Zool., No. 493: 1-40.
Sasaki, M. 1929. A Monograph of the Dibranchiate Cephalopods of the Japanese and Adjacent Waters. Journal of the College of Agriculture, Hokkaido Imperial University, 20(supplement):357 pages.
Voss, G. L. 1963. Cephalopoda of the Philippine Islands. Bull. U. S. Nat. Mus., 234: 1-180.
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 © 2004 Richard E. Young and
- First online 16 July 2004
- Content changed 30 November 2003
Citing this page:
Young, Richard E. and Vecchione, Michael. 2003. Mastigoteuthis cordiformis http://tolweb.org/Mastigoteuthis_cordiformis/19510/2003.11.30 in The Tree of Life Web Project, http://tolweb.org/. Version 30 November 2003 (under construction).