Overview

Brief Summary

Introduction

Sepioteuthis is distinctive; unlike in many loliginid genera, controversy does not exists over which species should be included (Vecchione et al., 1998). These loliginids have a rather broad, posteriorly rounded mantle and fins that extend nearly the full length of the mantle. This gives them a Sepia-like appearance. They also lay eggs that are much larger than those of other loliginids. They usually are found in shallow tropical or subtropical regions.

Brief diagnosis:

A loliginid ...

  • with fins in adults that occupy >85% ML; combined fin shape broadly elliptical.
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Richard E. Young

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Comprehensive Description

Characteristics

  1. Arms
    1. Arm sucker rings with pointed teeth around entire margin.
    2. Hectocotylus:
      1. Ventral crest absent.
      2. Proximal suckers unmodified.
      3. Distal suckers reduced, sucker stalks elongated along modified portion of arm to form papillae on both dorsal and ventral rows.

  2. Tentacles
    1. Tentacular clubs expanded, with suckers in four series.

  3. Head
    1. Beaks: Descriptions can be found here: Lower beak; upper beak.
  4. Mantle
    1. Posterior mantle not elongated into tail-like structure.

  5. Fins
    1. Extend nearly full length of mantle (>85% of ML) except in very young squid.

      Figure. Dorsal view of S. lessoniana, adult showing the large fins. Drawing from Roper, et al. (1984)

  6. Photophores
    1. Photophores absent.

  7. Viscera
    1. Eggs larger than 5 mm.
    2. Eggs lie in single, straight series within egg strand.
    3. Spermatophore cement body short.
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Richard E. Young

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Distribution

Because of their association with coral reefs, the common name for these species is "reef squids". The distribution of the genus generally follows that of coral reefs, warm, clear, tropical and subtropical waters, but coral reefs are not a habitat requirement for all of these squids. For example, S. lessoniana is common around the southern part of Honshu and Kyushu in Japan, but is not associated with coral reefs in those areas and occupies temperate waters of southern Australia. There is one species, S. australisS. sepioidea, in the western Atlantic; the remaining species are found in Indo-West Pacific waters.

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Richard E. Young

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Ecology

Habitat

Depth range based on 501 specimens in 9 taxa.
Water temperature and chemistry ranges based on 80 samples.

Environmental ranges
  Depth range (m): 1 - 777
  Temperature range (°C): 12.800 - 27.194
  Nitrate (umol/L): 0.090 - 10.763
  Salinity (PPS): 34.598 - 36.216
  Oxygen (ml/l): 3.750 - 5.697
  Phosphate (umol/l): 0.083 - 0.731
  Silicate (umol/l): 0.777 - 6.808

Graphical representation

Depth range (m): 1 - 777

Temperature range (°C): 12.800 - 27.194

Nitrate (umol/L): 0.090 - 10.763

Salinity (PPS): 34.598 - 36.216

Oxygen (ml/l): 3.750 - 5.697

Phosphate (umol/l): 0.083 - 0.731

Silicate (umol/l): 0.777 - 6.808
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Evolution and Systematics

Evolution

Discussion of Phylogenetic Relationships

View Sepioteuthis Tree

Type species. -- Loligo sepioidea Blainville, 1823 by original designation.Relationships among species are uncertain. Segawa et al. (1993) suggest that S. lessioniana represents a species complex.
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
                                        
Specimen Records:53Public Records:44
Specimens with Sequences:49Public Species:3
Specimens with Barcodes:49Public BINs:7
Species:3         
Species With Barcodes:3         
          
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Barcode data

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Locations of barcode samples

Collection Sites: world map showing specimen collection locations for Sepioteuthis

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Wikipedia

Sepioteuthis

Sepioteuthis, commonly known as reef squids or oval squids, is a genus of loliginid squid. Reef squids are easily recognizable by their large rounded fins that extend along almost the entire length of their mantles, giving them a superficial resemblance to cuttlefish.[1]

Species[edit]

Three species are currently recognized,[2] though S. australis and S. lessoniana are believed to be cryptic species complexes.[3]

An additional species, S. loliginiformis, was described in 1828, but its validity is questionable. However, if the species turns out to be the same as S. australis or S. lessoniana, S. loliginiformis would be the senior synonym and replace the younger name currently in use.

References[edit]

  1. ^ Michael Vecchione & Richard E. Young (2010). "Sepioteuthis Blainville, 1824. Reef squids". The Tree of Life Web Project. Retrieved October 16, 2011. 
  2. ^ M. Vecchione, E. Shea, S. Bussarawit, F. Anderson, D. Alexeyev, C.-C. Lu, T. Okutani, M. Roeleveld, C. Chotiyaputta, C. Roper, E. Jorgensen, and N. Sukramongkol (2005). "Systematics of Indo-West Pacific Loliginids". Phuket Marine Biological Center Research Bulletin (Phuket Marine Biological Center) 66: 23–26. ISSN 0858-1088. Retrieved August 13, 2011. 
  3. ^ Lianos Triantafillos & Mark Adams (2005). "Genetic evidence that the northern calamary, Sepioteuthis lessoniana, is a species complex in Australian waters". ICES Journal of Marine Science (International Council for the Exploration of the Sea, Elsevier) 62: 1665–1670. doi:10.1016/j.icesjms.2005.06.004. ISSN 1054-3139. Retrieved August 17, 2011. 
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