Overview

Distribution

Range Description

This species was described from specimens from D’Entrecasteaux Islands and Uama Island, Papua New Guinea, Guam, Mariana Islands, Wake Island, Normanby Island, and Gallow’s Reef. It is also found in the lagoon of Tahiti, Society Islands. It has been recorded from southern Japan (Senou et al. 2007), New Caledonia and Vanuatu (R. Myers pers. comm. 2009).
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West Pacific.
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Pacific: Papua New Guinea, Guam, Wake Island, and Tahiti.
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Physical Description

Morphology

Dorsal spines (total): 9; Dorsal soft rays (total): 12; Analspines: 3; Analsoft rays: 12; Vertebrae: 25
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Size

Max. size

12.0 cm SL (male/unsexed; (Ref. 75958))
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Diagnostic Description

This species is characterized by the following: D IX,12, the first two dorsal spines flexible and shorter than longest dorsal soft rays; body depth 3.1-3.35 in SL; cheek scaleless; 2 small scales dorsally on opercle; gill rakers 17-20; juveniles and females whitish with a red stripe from above eye to back at base of dorsal fin; males with a pale-edged black spot on seventh lateral-line scale and scales below (Ref. 75958).
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Type Information

Paratype for Xyrichtys halsteadi Randall
Catalog Number: USNM 371321
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): P. Lobel
Year Collected: 1999
Locality: Wake Island, United States Minor Outlying Islands, Pacific
Depth (m): 30 to 30
  • Paratype: Randall, J. E. & Lobel, P. S. 2003. Bulletin of Marine Science. 72 (3): 972, Figs. 1-3.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
This species inhabits sand or sand and rubble bottoms, at depths of 21-49 m. Generally at depths of 30 m or more, and well away from coral reefs (Randall and Lobel 2003).

Xyrichtys halsteadi is distinct from the one other described species of the genus in the Indo-Pacific, the Hawaiian Xyrichtys woodi, in having the first two dorsal spines flexible (one in woodi), a more elongate body (depth 3.1–3.35 in standard length, compared to 2.7-2.8 for woodi), and in color (Randall and Lobel 2003).

Juveniles of X. woodi, however, more closely resemble the young and female stage of X. halsteadi in color. Juveniles and females of X. halsteadi are whitish with a red band from above eye to back at base of dorsal fin, males are more colorful, featuring a pale-edged black spot on the seventh lateral-line scale and scales in the next row below (Randall and Lobel 2003).

Systems
  • Marine
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Environment

reef-associated; marine; depth range 21 - 49 m (Ref. 75958)
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Depth range based on 3 specimens in 1 taxon.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 37.5 - 48.8
  Temperature range (°C): 26.748 - 26.748
  Nitrate (umol/L): 0.538 - 0.538
  Salinity (PPS): 35.057 - 35.057
  Oxygen (ml/l): 4.603 - 4.603
  Phosphate (umol/l): 0.219 - 0.219
  Silicate (umol/l): 0.566 - 0.566

Graphical representation

Depth range (m): 37.5 - 48.8
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2010

Assessor/s
Bertoncini, A. & Choat, H.

Reviewer/s
Craig, M.T. & Carpenter, K.E.

Contributor/s

Justification
This species is relatively widespread and probably has a wider range than reported. There are no known threats. It is listed as Least Concern.
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Population

Population
There is no population information available for this species.

Population Trend
Unknown
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Threats

Major Threats
There are no major threats known to this species.
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Least Concern (LC)
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Management

Conservation Actions

Conservation Actions
There are no species specific conservation measures in place. However, it occurs in MPAs in parts of its range (Pati Point, Piti Bomb Holes and Sasa Bay Marine Preserves, Haputo, Horote Peninsula Ecological Reserve Area and Guam Territorial Seashore Park and National Wildlife Refuge).
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