Overview

Distribution

Southeastern Atlantic (33° 07' S., 4° 30' E.), the Antarctic (63° 51' S, 54° 16' E); 13° 35' N, 101° 45' E, Pacific (north-central waters and 13° 33 N 101° 45' W). [Barnard, 1931]
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Source: Pelagic Invertebrates LifeDesk

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Physical Description

Morphology

The eye are shagreen and not divided into facets.
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© Dunn , Adam

Source: Pelagic Invertebrates LifeDesk

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Size

Length of sexually mature specimens 28-35 mm. [Barnard, 1931]
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© Dunn , Adam

Source: Pelagic Invertebrates LifeDesk

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Diagnostic Description

The head is large and its anterior part produced into two acute lobes, of which the lower (interantennal) is larger than the upper. Like the entire body, the eyes are also shagreen and not divided into facets. Antennae I in females have a large, thin, platelike one-segmented flagellum, whose inner surface bears numerous thin setae. The one-segmented flagellum of antennae II bears thin setae along its anterior margin. The mandibles have a well-developed cutting edge and an accessory plate; the dentate process is a triangular lamella. The outer lobe of maxillae I is strong, with denticles along the distal margin and the palp very short, petaloid. The inner lobes of the maxillipeds are armed with numerous thin setae, the outer lobes oval, and the apex acuminate. The somites of the pereon are almost equal in length, each with a low transverse roller. The lower posterior angles are rounded in all the somites while the anterior angles in somites I and VI-VII are slightly stretched forward but not acute. The coxal plates of somites I and II are small and low, both with a horizontal keel. Somites III-IV are high while somites VI-VII are low. Pereopods I and II have a chela formed by the 5th and 6th segments. The distal posterior angle of the 5th segment of pereopods I stretched into a broad and acute lobe, extending in females to 3/4 the length of the 6th segment and in males, to its distal end; the 6th segment is oval, with a straightly truncate distal margin, and its distal posterior angle stretches into a small lobe. The lobe of the 5th segment of pereopods II is narrower than in pereopods I and extends to the distal end of the 6th segment; the 2nd segment is narrower than in pereopods I. The 2nd segment of pereopods III and IV is distally broadened, clavate; the 6th segment is thin, slightly curved; the claw is very small. Pereopods V-VI are somewhat longer than pereopods IV; the 2nd segment abruptly broadens distally; the 6th segment is narrowly conical, slightly curved; the claw is very small and weak. Pereopods VII are similar to pair VI in structure but shorter. Epimerons I-III have a slanted keel; the posterior lower angle of epimeron III is stretched into a long acute lobe directed backward. The uropods have a short broad peduncle and lanceolate rami, which are narrow in I and II and broad in III. The telson is galeiform, with an acute apex extending almost to the distal end of the peduncle of uropods III. [Barnard, 1931]
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Source: Pelagic Invertebrates LifeDesk

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Ecology

Habitat

Depth range based on 5 specimens in 1 taxon.
Water temperature and chemistry ranges based on 5 samples.

Environmental ranges
  Depth range (m): 0 - 1122
  Temperature range (°C): -0.477 - 3.286
  Nitrate (umol/L): 26.118 - 35.875
  Salinity (PPS): 33.832 - 34.572
  Oxygen (ml/l): 4.292 - 7.973
  Phosphate (umol/l): 1.822 - 2.294
  Silicate (umol/l): 33.333 - 69.160

Graphical representation

Depth range (m): 0 - 1122

Temperature range (°C): -0.477 - 3.286

Nitrate (umol/L): 26.118 - 35.875

Salinity (PPS): 33.832 - 34.572

Oxygen (ml/l): 4.292 - 7.973

Phosphate (umol/l): 1.822 - 2.294

Silicate (umol/l): 33.333 - 69.160
 
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Dispersal

Zeidler (2004) records this genus from the southeastern Atlantic Ocean (33°07' S, 4°30' E), the North Pacific Ocean (28°N, 155°W), and by the equatorial Pacific (13°35' N, 101°145' W).
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