Abstract

Two new species of the genus Hemitriakis Herre, 1923 (Carcharhiniformes: Triakidae) are described from tropical Australia. Hemitriakis falcata is described from ten specimens from the outer continental shelf of Western Australia at depths of 146 to 197 m. Hemitriakis abdita is described from five specimens from the Coral Sea Plateau off north-eastern Queensland at 225 to 401 m. Hemitriakis falcata and H. abdita are separable from their two named congeners H. leucoperiptera, from the Philippine Islands, and H. japanica, from Japan, Taiwan, China and Korea, by a combination of vertebral counts, first dorsal position, fin and eye shape, and juvenile colouration. Hemitriakis falcata additionally differs from H. japanica in chondrocranial morphology. Hemitriakis falcata and H. abdita are sibling species separated by wide, non-overlapping differences in vertebral counts as well as by slight differences in morphometrics, tooth counts, colouration, and cranial morphology. These species represent the first record of Hemitriakis from Australia. A nominal record of H. japanica from Ambon is uncertain while another record of H. japanica from New Caledonia may be based on H. abdita. A key to species of Hemitriakis is presented.

 
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Bibliographic Data

Short Form
Compagno and Stevens, 1993, Rec. Aust. Mus. 45(2): 195–220
Author
L. J. V. Compagno; J. D. Stevens
Year
1993
Title
Hemitriakis falcata n.sp. and H. abdita n.sp., two new houndsharks (Carcharhiniformes: Triakidae) from Australia
Serial Title
Records of the Australian Museum
Volume
45
Issue
2
Start Page
195
End Page
220
DOI
10.3853/j.0067-1975.45.1993.20
Language
English
Date Published
30 July 1993
Cover Date
30 July 1993
ISSN
0067-1975
CODEN
RAUMAJ
Publisher
The Australian Museum
Place Published
Sydney, Australia
Subjects
FISHES; TAXONOMY
Digitized
05 February 2009
Reference Number
20
EndNote
/Uploads/Journals/17802/20.enw
Title Page
/Uploads/Journals/17802/20.pdf
File size: 94kB
Complete Work
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