Overview

Comprehensive Description

[[ Dipturus Rafinesque ZBK ]]

In 1979, a series of exploratory trawl surveys were initiated to investigate commercial fish resources on the continental shelf and slope off southeastern Australia. Some skates (family Rajidae) caught were unidentifiable and this initiated a local revision of the fauna by the senior author. The most problematic subgroups were those members of the genus Dipturus ZBK (then assigned to Raja ZBK ) which contained new taxa from both inshore and deep continental slope habitats. By the mid 1980’s, this fauna had been well delineated with four rajin skates, Dipturus cerva (Whitley 1939) , D. lemprieri (Richardson 1845) , D. whitleyi (Iredale 1938) , and an undescribed species, D. sp. A (sensu Last & Stevens 1994), known from the continental shelf. Of these, D. whitleyi , a large skate that reaches more than 1 m disc width, and the smaller and more common D. lemprieri , were known to occur frequently in coastal marine habitats of Tasmania. However, no skates were recorded from the brackish middle and upper estuaries of the region.

  • Peter R. Last, Daniel C. Gledhill (2007): The Maugean Skate, Zearaja maugeana sp. nov. (Rajiformes: Rajidae) - a micro-endemic, Gondwanan relict from Tasmanian estuaries. Zootaxa 1494, 45-65: 45-45, URL:http://www.zoobank.org/urn:lsid:zoobank.org:pub:57773595-4E06-41A2-A2DA-A4B3E5FADA74
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Dipturus sp. A (sensu Last and Stevens, 1994 as Raja sp. A ) - Longnosed skate

(Fig. 3)

Distribution

Found in New South Wales, Victoria and Tasmania in depths from 40-250 m (Last and Stevens 1994).

Description

Small, squat/broad, round in shape (Table 1); colour brown/yellow, transparent; ventral surface almost flat, dorsal surface convex. Ventral surface smooth with very few fine fibroids; dorsal surface with fine fibroids. Lateral keel broad, ≥ 5 mm in width on each side. Attachment fibres very fine, located on lateral margin; posterior and anterior horns depressed, short; both aprons short, posterior apron length slightly> anterior apron length.

  • M. A. Treloar, L. J. B. Laurenson, J. D. Stevens (2006): Descriptions of rajid egg cases from southeastern Australian waters. Zootaxa 1231, 53-68: 59-59, URL:http://www.zoobank.org/urn:lsid:zoobank.org:pub:DF293AC9-4368-4381-9FA2-F4486715FF80
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Dipturus sp. B (sensu Last and Stevens, 1994 as Raja sp. B ) - Grey skate

(Fig. 4)

Distribution

Found in waters off New South Wales, Tasmania, South Australia, and Western Australia. Most abundant at depths of 450-600 m, but recorded over depths of 330-950 m (Last and Stevens 1994).

Description

Egg case medium to large, slightly rounded in shape (Table 1); colour golden, may have a green tinge. Fibroids thick, present on both dorsal and ventral surfaces; lateral keel> 9% maximum body width. Attachment fibres prominent on lateral margin; tendrils extending from posterior horns. Anterior horns slightly longer than posterior horns, horns depressed, narrow. Anterior and posterior aprons fully extended, similar in length (> 15% of BL).

  • M. A. Treloar, L. J. B. Laurenson, J. D. Stevens (2006): Descriptions of rajid egg cases from southeastern Australian waters. Zootaxa 1231, 53-68: 60-60, URL:http://www.zoobank.org/urn:lsid:zoobank.org:pub:DF293AC9-4368-4381-9FA2-F4486715FF80
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Dipturus sp. L (sensu Last and Stevens, 1994 as Raja sp. L ) - Maugean skate

(Fig. 5)

Distribution

Recorded from two separate estuaries on the west coast of the Tasmanian land-mass (Bathurst Harbour and Macquarie Harbour). Most common in waters of about 5 m depth (Last and Stevens 1994).

Description

Egg case medium to large, rectangular (Table 1); colour green or brown, almost transparent; dorsal and ventral surfaces with few fine fibroids; lateral keel> 15% maximum width; attachment fibres absent. Anterior region not described as specimens collected were only three quarters developed; body length of a complete specimen would possibly be> 90 mm. Posterior horns relatively long, length> 30 mm; posterior apron long, sub-equal in size to posterior horns; apron fringed, delicate.

  • M. A. Treloar, L. J. B. Laurenson, J. D. Stevens (2006): Descriptions of rajid egg cases from southeastern Australian waters. Zootaxa 1231, 53-68: 61-62, URL:http://www.zoobank.org/urn:lsid:zoobank.org:pub:DF293AC9-4368-4381-9FA2-F4486715FF80
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Ecology

Habitat

Depth range based on 11307 specimens in 30 taxa.
Water temperature and chemistry ranges based on 7778 samples.

Environmental ranges
  Depth range (m): -9 - 1317
  Temperature range (°C): 0.819 - 22.261
  Nitrate (umol/L): 0.276 - 37.841
  Salinity (PPS): 30.162 - 38.670
  Oxygen (ml/l): 0.906 - 7.704
  Phosphate (umol/l): 0.134 - 2.571
  Silicate (umol/l): 0.677 - 58.579

Graphical representation

Depth range (m): -9 - 1317

Temperature range (°C): 0.819 - 22.261

Nitrate (umol/L): 0.276 - 37.841

Salinity (PPS): 30.162 - 38.670

Oxygen (ml/l): 0.906 - 7.704

Phosphate (umol/l): 0.134 - 2.571

Silicate (umol/l): 0.677 - 58.579
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
Specimen Records:468
Specimens with Sequences:417
Specimens with Barcodes:344
Species:44
Species With Barcodes:40
Public Records:125
Public Species:18
Public BINs:15
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Statistics of barcoding coverage: Dipturus cf. flossada

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 11
Species With Barcodes: 1
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Statistics of barcoding coverage: Dipturus sp. I

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 1
Species With Barcodes: 1
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Statistics of barcoding coverage: Dipturus cf. intermedia

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 11
Species With Barcodes: 1
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Statistics of barcoding coverage: Dipturus sp.

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 7
Species With Barcodes: 1
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Statistics of barcoding coverage: Dipturus sp. 2

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 1
Species With Barcodes: 1
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Barcode data

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Wikipedia

Dipturus

Dipturus is a large genus of skates native to the Pacific, Atlantic and Indian oceans.[1]

Species[edit]

There are currently 49 recognized species in this genus:[1][2]

References[edit]

  1. ^ a b Froese, Rainer, and Daniel Pauly, eds. (2013). Species of Dipturus in FishBase. October 2013 version.
  2. ^ a b Last, P.R. & Alava, M. (2013): Dipturus amphispinus sp. nov., a new longsnout skate (Rajoidei: Rajidae) from the Philippines. Pp. 214-227 in: de Carvalho, M.R., Ebert, D.A., Ho, H.-C. & White, W.T. (eds.) : Systematics and biodiversity of sharks, rays, and chimaeras (Chondrichthyes) of Taiwan. Zootaxa, 3752 (1): 1–386.
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