AsperoteuthisRichard E. Young and Clyde F. E. Roper
Little is known obout the biology of any species of Asperoteuthis. The most peculiar feature of this genus is the structure of the tentacular clubs. The distal half of the club has typical suckers and suggests that this part of the club functions in the usual capture of prey. The function of the bare proximal half of the club with its broad protective membranes is less clear but relates to another problem: How can the long and extremely slender tentacles, which in A. acanthoderma can be 7-12 times the mantle length (Tsuchiya and Okutani, 1993), be deployed? Perhaps the wide protective membranes of the proximal region of the club, which are composed virtually entirely of muscular trabeculae, function as muscular fins that swim the club into position.
A chiroteuthid ...
- with suckers only on distal portion of tentacle-club.
- with atypical tragus and antitragus in funnel locking-apparatus which define a slender Y-shape or a slender curved groove.
- without photophores on arms IV.
- Long, subequal in length in large subadults.
- Club divided into two portions by symmetrical protective membranes.
- Suckers only on distal portion of club.
- Olfactory organ located well posterior to each eye.
- Funnel valve present.
- Funnel-locking apparatus variable; with inverted Y-shaped groove that poorly defines a weak tragus and strong antitragus or a curved groove without an antitragus. image info
- No photophores on viscera or arms IV.
- Large oval photophore patch on ventral surface of each eyeball.
- Luminescent pads on tentacles (also in Chiroteuthis).
- Aboral surface of club with large photophore on tip (see arrow) and two series of small photophores.
These squid generally lose the tentacles during capture and can easily be confused with Grimalditeuthis. However the lack of a fused funnel-mantle locking apparatus easily distinguishes them.
Lu (1977) described Chiroteuthis acanthoderma. Nesis (1980) incorrectly synonymized this species with the incompletely described Chiroteuthis famelica Berry, 1909 (now = Mastigoteuthis famelica, see Young, 1991) and erected for it the new genus Asperoteuthis. The type species of the genus is C. acanthoderma Lu, 1977.
Nothing is known of the phylogenetic relationships among the species.
Lu, C. C. 1977. A new species of squid Chiroteuthis acanthoderma, from the Southwest Pacific (Cephalopoda, Chiroteuthidae). Steenstrupia, 4: 179-188.
Nesis, K. N. 1980. Taxonomic position of Chiroteuthis famelica Berry. Bull. Moscow Obshch. Ispyt. Prirody, sect. Biology, 85: 59-66. [In Russian].
Tsuchiya, K. and T. Okutani. 1993. Rare and interesting squids in Japan -X. Recent occurences of big squids from Okinawa. Venus, 52: 299-311.
Young, R. E. 1978. Vertical distribution and photosensitive vesicles of pelagic cephalopods from Hawaiian waters. Fishery Bulletin, 76: 583-615.
Young, R. E. 1991. Chiroteuthid and related paralarvae from Hawaiian waters. Bull. Mar. Sci., 49: 162-185.
Richard E. Young
Dept of Oceanography
University of Hawaii
Honolulu, Hawaii 96822
Page copyright © 1999 Richard E. Young and
Citing this page:
Young, Richard E. and Roper, Clyde F. E. 1999. Asperoteuthis http://tolweb.org/Asperoteuthis/19461/1999.01.01 in The Tree of Life Web Project, http://tolweb.org/. Version 01 January 1999 (under construction).