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Published October 17, 2019 | Version v1
Journal article Open

Pteropsaron indicum, a new species of signalfish (Teleostei: Trichonotidae: Hemerocoetinae) with a micro-CT analysis of osteology

  • 1. Ocean Science Foundation, 4051 Glenwood, Irvine, CA 92604, USA and Guy Harvey Research Institute, Nova Southeastern University, 8000 North Ocean Drive, Dania Beach, FL 33004, USA
  • 2. Department of Aquatic Biology & Fisheries University of Kerala, Thiruvananthapuram 695 581, Kerala, India

Description

An unusual yellow-striped deepwater hemerocoetine fish trawled up from 70 m depth in the Lakshadweep Sea (Laccadive Sea) off Kerala, southern India is described here as the new species Pteropsaron indicum, based on two male specimens measuring 82 and 84 mm SL. The new species of signalfish is notable among the grouping of three genera sharing crowded dorsal-fin spines and a maxillary spine (Acanthaphritis, Osopsaron, and Pteropsaron) in having only three dorsal-fin spines, greatly extended dorsal-fin soft rays in addition to the greatly extended dorsal-fin spines, high counts of rays in the dorsal and anal fins (D- III,27 and A- 29), a high number of vertebrae (38), and a large body size. Pteropsaron indicum possesses the distinctive arrangement of the spinous-dorsal-fin-pterygiophore complex found in this subset of trichonotid fishes. In P. indicum, the complex is placed between the fourth and fifth neural spines. The micro-computed tomography technique (micro-CT)  is used to illustrate that osteological peculiarity in fine detail.

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