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Overview

Brief Summary

The Indo-Pacific scorpionfish genus Scorpaenopsis includes around two dozen recognized species (24 recognized by Randall and Eschmeyer 2001 and several additional species described more recently). Scorpaenopsis obtusa (Shortsnout Scorpionfish) was formally recognized as a distinct species only in 2001 based on three specimens, two from the Philippines and one from Papua New Guinea. Four additional specimens have been subsequently identified that were collected in Japan and Western Australia, as well as Papua New Guinea. Collection data indicate capture depths ranging from 0 to 50 m. Scorpaenopsis obtusa is presumed to be a demersal fish, i.e., living on or near the seabottom. This is the smallest “humpback” species in the genus. Known specimens have ranged in size from 36.5 to 79 mm standard length (i.e., excluding the tail) (Motomura and Shinohara 2005). Motomura and Shinohara discuss technical characters for discriminating this species from related species, notably the very similar S. gibbosa. These authors note that S. obtusa is currently known from the eastern Indian and western Pacific Ocean, whereas S. gibbosa is distributed in the western Indian Ocean, suggesting that a vicariance event may be related to speciation within Scorpaenopsis.

  • Motomura, H. and G. Shinohara. 2005. Assessment of taxonomic characters of Scorpaenopsis obtusa and S. gibbosa (Scorpaenidae), with first records of S. obtusa from Japan and Australia and comments on the synonymy of S. gibbosa. Cybium 29(3): 295-301.
  • Randall, J.E., and W. N. Eschmeyer. 2001. Revision of the Indo-Pacific Scorpionfish genus Scorpaenopsis, with Descriptions of Eight New Species. 79 pp., 60 col. figs. Dec 2001. Ichthyology Collection of the Bishop Museum in Honolulu, Hawaii, U.S.A.
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Comprehensive Description

Biology

Inhabits coral reef. Benthic (Ref. 75154).
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Distribution

Japan, Philippines, Australia and Papua New Guinea.
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Western Central Pacific: Philippines and Papua New Guiena.
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Physical Description

Morphology

Dorsal spines (total): 12; Dorsal soft rays (total): 9; Anal spines: 3; Analsoft rays: 5; Vertebrae: 24
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Size

Max. size

7.9 cm SL (female)
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Diagnostic Description

Snout very short, about equal to orbit diameter. Ascending process of premaxilla extending into interorbital space. Body depth of adults 2.0-2.2 in SL. Longitudinal scale series 37-39 (Ref 42181).
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Ecology

Habitat

Environment

demersal; marine
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Depth range based on 1 specimen in 1 taxon.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 17 - 17
  Temperature range (°C): 28.212 - 28.212
  Nitrate (umol/L): 0.834 - 0.834
  Salinity (PPS): 33.797 - 33.797
  Oxygen (ml/l): 4.443 - 4.443
  Phosphate (umol/l): 0.079 - 0.079
  Silicate (umol/l): 1.370 - 1.370
 
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Conservation

Threats

Not Evaluated
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