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Opisthoteuthis Verrill 1883

Flapjack devilfishes

Roger Villanueva, Richard E. Young, and Michael Vecchione
The following 17 nominal species are included in the genus.
Containing group: Opisthoteuthidae

Introduction

Species of Opisthoteuthis are the most compressed, in the anterior-posterior axis, of any cephalopod. This flattened appearance (due sometimes to preservation) gives them the common name of flapjack or pancake devilfish. Fresh specimens have ovoid form. Species are thought to be primarily benthic although they are capable of swimming and in some species the swimming may be an important component of their pouncing on minute prey. As in other cirrates, most species are poorly known.

Diagnosis

Opisthoteuthids ...

Characteristics

  1. Arms and web
    1. Arms of males generally with modified suckers (i.e., enlarged and often with complex alignment) in one or two fields (proximal and distal).
    2. Cirri short (in preserved animals).
    3. Cirri may be retractile into pockets. The retractile (rather than just contractile) nature of the cirri has been suggested by several authors due to their appearance in preserved animals. However, this attribute remains uncertain.
    4. Web nodules (= web supports; these are often difficult to detect) present as multiple or single nodules or absent. 
    5.  image info

      Figure. Oral view of Opisthoteuthis grimaldii (?). Photograph shows multiple web nodules, some of which are indicated by the arrows. Also note the rather long cirri in this live Opisthoteuthis. Photograph from a submersible.

  2. Fins
    1. Small, length approximately half mantle width.

  3. Gills
    1. Half-orange appearance.

  4. Digestive tract
    1. Intestine approximately 1.5 - 2.0 times esophagus (and crop) in length. Digestive tract not a simple loop (i.e., intestine makes lateral bends and/or loops.
    2. Digestive gland bilobed or unilobed.
    3. Radula absent.

  5. Eyes
    1. Large, diameter often 60-70% of ML, 50% of head width.

  6. Optic nerve tract
    1. Two or more bundles penetrate white body.

  7. Optic lobe
    1. Kidney-shaped in cross-section.

  8. Shell
    1. U-shaped, lateral walls of wings not parallel (i.e., spread between walls increases toward tips).
    2. Outer surface of saddle usually with groove (narrow or broad, shallow or deep); outer surface rarely flat.
    3. Wing frequently terminates as elongate, simple, pointed cone; termination complex in some species.

  9. Pigmentation
    1. Areolar spots present. In some species these are difficult to detect or absent.
    2.  image info

      Figure. Side view of Opisthoteuthis agassizii. Photograph from submersible. In this photograph, the lines of white areolar spots are easily seen, especially on the arms.

Species Comparisons
  Mature males Both sexes
Species Arm I more robust Prox. field: No. of suckers Distal field: No. of suckers Prox. field: Arm no. Distal field: Arm no. Distal field: Largest sucker, mean position DESD> PESD ** Arm sucker counts Funnel organ Web supports Digest. gland bilobed Ocean
O. agassizii No 5 7-8 I-IV I-IV 34-36 No/yes 58-80 V-shape Multiple No W.N. Atlantic
O. albatrossi No 0 3 None I ? Yes 80 ? Single? Yes N. Pacific
O. bruuni No 3 2-3 I-IV I-IV 24-27* No ? 2 pads ? ? E. S. Pacific
O. californiana No 8-10 3-8 I-IV I ca. 27 Yes ? 2 pads ? ? N. Pacific
O. calypso No 2-6 2-3 III I-IV 26-27 Yes 47-58 2 pads Single No E. Atlantic
O. chathamensis No 5-7 6-8 I-IV I-IV ca 22 Equal? 41-55 V-shape ? Yes W. S. Pacific
O. depressa No 16 0 I-IV None -- No 50 ? Absent? ? W. N. Pacific
O. extensa ? ? ? ? ? ? ? ? ? ? ? E. Indian
O. grimaldii No 4-11 9-10 I-IV I-IV 29-31 No 73-80 2 pads Single Yes E. Atlantic
O. hardyi Slight 4-9 9-14 I-IV I-IV 22-24 Equal 60-67 ? Absent No high S. Atlantic
O. massyae Yes 7-8 9-11 I-IV II-IV 40-41 No 81-106 2 pads Multiple Yes E. Atlantic
O. medusoides ? ? ? ? IV ? ? ? ? ? ? W. Indian
O. mero No 5-8 ? I-IV None -- No 54-71 V-shape ? Yes W. S. Pacific
O. persephone ? ? ? ? ? ? ? 93 ? ? Yes Off S. Aust.
O. philipii ? 5-11 ? ? ? ? ? ? V-shape Single ? NW Indian
O. pluto ? ? 3-4 ? II-IV ? No? 80-85 2 pads ? Yes Off S. Aust.
O. robsoni No 7-8 ? I-IV None -- No 74-89 V-shape ? No W. S. Pacific

*From illustration. ** DESD = Distal field enlarged sucker diameter; PESD = Proximal field enlarged sucker diameter. For the purposes of this table, a distal field is considered to be absent if suckers there do not show a distinct enlargement.

 

Nomenclature

Cirroteuthis caudani Joubin, 1896 appears to be a species of Opisthoteuthis [probably O. grimaldii or O. massyae according to Martin Collins, pers. comm., 2002] but the type is apparently lost (Villanueva et al., 2002)

References

Chun, C. 1915. Die Cephalopoden. Myopsida, Octopoda. Wissenschaftliche Ergebnisse der Deutschen Tiefsee-Expedition, "Valdivia" 1898-1899, 18 (2): 405-522 + Atlas.

O'Shea, Steve. 1999. The Marine Fauna of New Zealand: Octopoda (Mollusca: Cephalopoda). NIWA Biodiversity Memoir 112: 280pp.

Sweeney, M.J. 2001. Current Classification of Recent Cephalopoda. pdf file, 59 pp.

Villanueva, R. 1992. Continuous spawning in the cirrate octopods Opisthoteuthis agassizii and O. vossi: features of sexual maturation defining a reproductive strategy in cephalopods. Marine Biology, 114:265-275.

Villanueva, R., Collins, M., Sanchez, P. and N. Voss. 2002. Systematics, distribution and biology of the cirrate octopods of the genus Opisthoteuthis (Mollusca, Cephalopoda) in the Atlantic Ocean, with description of two new species. Bulletin of Marine Science 71(2):933-985.

Voss, G. L. and W. G. Pearcy. 1990. Deep-water octopods (Mollusca: Cephalopoda) of the Northeastern Pacific. Proc. Calif. Acad. Sci. 47: 47-94.

Title Illustrations
Scientific Name Opisthoteuthis extensa
Reference from Thiele in Chun, C. 1915. Die Cephalopoden. Myopsida, Octopoda. Wissenschaftliche Ergebnisse der Deutschen Tiefsee-Expedition, "Valdivia" 1898-1899, 18 (2): 405-522 + Atlas.
View Aboral
Type Holotype
Scientific Name Opisthoteuthis extensa
Reference from Thiele in Chun, C. 1915. Die Cephalopoden. Myopsida, Octopoda. Wissenschaftliche Ergebnisse der Deutschen Tiefsee-Expedition, "Valdivia" 1898-1899, 18 (2): 405-522 + Atlas.
View Oral
Type Holotype
About This Page


Instituto de Ciencias del Mar (CSIC), Barcelona, Spain

Richard E. Young
University of Hawaii, Honolulu, HI, USA


National Museum of Natural History, Washington, D. C. , USA

Citing this page:

Villanueva, Roger, Young, Richard E., and Vecchione, Michael. 2006. Opisthoteuthis Verrill 1883. Flapjack devilfishes. Version 11 July 2006 (under construction). http://tolweb.org/Opisthoteuthis/20106/2006.07.11 in The Tree of Life Web Project, http://tolweb.org

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