O. knipovitchi reaches a size of at least 450 mm ML (Kubodera, et al., 1998) and is found in circumpolar Antarctic waters.
An Onykia ...
- with smooth skin (no warts, ridges or welts).
“Moroteuthis knipovitchi, sp. nov.
Sta. 176, March 3, 1965. trawling depth 550-400 m. 1♀; ML – 225 mm
The structure of the gladius is with short rhachis, long wide vane and terminal cartilaginous conus; the presence of rows of hooks on the clubs, and suckers with smooth rings on the arms; a rounded funnel groove; the absence of nuchal folds and photophores.
These characters allow this squid to placed in the genus Moroteuthis. However as it differs from the other known species of this genus, it is here referred to as a new species.
Description. (Fig. 2,3). The mantle, cylindrical in its anterior half, tapers from the base of the fins toward the posterior end (Fig. 2a). The anterior dorsal margin of the mantle is slightly produced while the ventral margin is emarginated in a gentle curve.
The fins are large and united together into a rhombus. They are broadest in the middle of their length. The skin is thin and smooth. The head is narrower than the mantle width. The funnel, broad at its base, is gradually attenuating and reaches the lower margin of the eye opening. The funnel organ (Fig. 2d) consists of the inverted V-shaped dorsal pad and 2 oval ventral pads. The locking apparatus (Fig. 2c) consists of a longitudinal cartilaginous groove on the funnel and a long narrow ridge on the mantle.
The arms are stout, in order 2-3 = 4-1. The suckers have smooth horny rings (Fig. 2e). The suckers of the ventral arms are smaller (d-1.8 mm) than those on the others (d-2.0-2.3 mm).
The tentacles are long with the stalks compressed laterally. At the base of the club there is an adhesive organ consisting of 9 minute, closely sitting suckers and 9 pads. The club (Fig. 2b) is slightly expanded with the swimming keel on the aboral surface. The oral surface is occupied by 13 pairs of long narrow hooks, those of the ventral row being larger than those of the dorsal. The largest is 1 cm in length. The hooks are wrapped in skin hoods. The base of each large hook is asymmetrical due the presence of a semi-circular appendage on 1 side (Fig. 2f). There is a small patch of 16 minute suckers at the distal extremity of the club.
The gladius (Fig. 3) with the vane running along its larger part has a terminal cartilaginous conus, which occupies about 1/6 of the length of the gladius. The terminal conus is triangular in cross section with a sharp ventral edge and flattened dorsal one.
The radula has 7 rows of teeth. All of the teeth are uniform unicuspid with narrow bases. There are no additional cusps (Fig. 2g). Photophores are absent. The color of the preserved animal is light violet.
The squid described above is a young female with minute eggs in the ovaries and moderate-sized nidamental glands, the length of which is 34 mm, i.e., 16% of mantle length.
The Holotype of Moroteuthis knipovitchi, sp. nov. is in the Zoological Institute of the Academy of Sciences of the U.S.S.R. Its measurements and indices are as follows:
Locality: near South Georgia Island.
Discussion. This species is allied to M. aequatorialis Thiele, 1921, by the presence of the thin, smooth skin while the other species of Moroteuthis (M. robusta, M. ingens, M. lonnbergii, M. robsoni) have warty skin. However M. knipovitchi is distinguished from these and M. aequatorialis by the peculiarities of the radula, the teeth of which are unicuspid while the radulae of other species are characterized by the presence of additional cusps: 2 on the teeth of the central row and 1 on the 1st lateral teeth.
Hoyle (1912) illustrated the radula of a species which, in his opinion, was M. ingens. At the same time he pointed out its differences from that of M. ingens described by Smith (1881). I am inclined to think that this radula is related to M. knipovitchi. I have had the opportunity to examine the radula of M. ingens from specimens caught in different parts of its range – in the Scotia Sea and off New Zealand. The radula had median teeth distinctly tricuspid, and the 1st lateral ones bicuspid.
Diagnosis. M. knipovitchi is characterized by the smooth, thin skin, peculiar radula, the asymmetrical base of hooks of the club, and the large rhombic fins. This species is named in honour of the famous Russian oceanologist academician N. M. Knipovitch.”
(Filippova, 1972: 392-395)
- Filippova, J. A. 1972. New data on the squids (Cephalopoda: Oegopsida) from the Scotia Sea (Antarctica). Malacologia, 11(2): 391-406. http://invertebrates.si.edu/antiz/taxon_view.cfm?mode=bibliography&citation=1512
- Club with 10-15 (Kubodera et al., 1998) or 13 (Filippova1972) pairs of slender hooks.
- Long, slender hooks of ventral series have asymmetrical bases (see drawing below).
Figure. Oral view of tentacular club and large club hook of O. knipovitchi. Drawings from Filippova, 1972.
- Skin smooth (i,e, no welts or ridges)(photograph of anterolateral mantle skin at right).
- Rhomboidal shape, not drawn out into a tail.
- Length 50-60% of ML.
- Width ca. 70% of ML.
- Rostrum short, 1/12th of GL (measured from ventral edge of conus); triangular in cross-section (dorsal surface flat, ventral surface pointed).
- Keel thickened posteriorly.
Except where noted, this description is taken from Filippova (1972). The slender, asymmetrical hooks, smooth skin, homodont radula (see mext page) and the rhomboidal fins characterize this species.
Habitat and Ecology
Molecular Biology and Genetics
Barcode data: Filippovia knipovitchi
Below is the sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.
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Statistics of barcoding coverage: Filippovia knipovitchi
Public Records: 1
Specimens with Barcodes: 12
Species With Barcodes: 1
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Filippovia knipovitchi, the smooth hooked squid, is a species of squid in the family Onychoteuthidae and the sole member of the genus Filippovia. It is found in the Antarctic and Atlantic Oceans, and reaches a mantle length of 35 cm.
- Bolstad, K.S.R. 2010. Systematics of the Onychoteuthidae Gray, 1847 (Cephalopoda: Oegopsida). Zootaxa 2696: 1–186. Preview