Two new species of blackwater catfishes (Siluriformes: Siluridae and Clariidae) from the Natuna  Archipelago, Indonesia

Bi Wei LOW; Heok Hee NG; Heok Hui TAN

doi:10.26107/RBZ-2022-0020

Two new species of blackwater catfishes (Siluriformes: Siluridae and Clariidae) from the Natuna Archipelago, Indonesia

Bi Wei LOW, Heok Hee NG, Heok Hui TAN

Science Unit

Research output: Journal Publications › Journal Article (refereed) › peer-review

2 Citations (Scopus)

Abstract

Two new species of blackwater catfishes are described from Pulau Natuna Besar of the Natuna Archipelago, Indonesia. Silurichthys insulanus (Siluridae), new species, differs from all congeners in having a combination of characters: eye diameter 8% HL; pectoral-fin length 16.0% SL; distinctly humped nuchal profile; 1 branched dorsal-fin ray; body depth at anus 16.0% SL; 54 anal-fin rays; caudal peduncle depth 5.7% SL; caudal fin asymmetrically forked, with 12 principal rays and upper lobe 1.1 times longer than lower lobe; and 50 vertebrae. Clarias rennyae (Clariidae), new species, is distinguished from all Southeast Asian congeners in having a combination of characters: anal-fin length 51.3–56.3% SL; body depth at anus 13.1–13.7% SL; head width 17.9–18.9% SL; distance between occipital process and dorsal-fin origin 6.8–8.9% SL; frontal fontanelle length 17.7–22.5% HL; anterior edge of pectoral spine with 19–31 irregular tiny asperities; and 65–68 total vertebrae. Both new species appear to be endemic to blackwater streams along the western coast of Pulau Natuna Besar.

Original language	English
Pages (from-to)	385-396
Number of pages	12
Journal	Raffles Bulletin of Zoology
Volume	70
DOIs	https://doi.org/10.26107/RBZ-2022-0020
Publication status	Published - 1 Jul 2022

Bibliographical note

Funding Information:
We thank Kelvin Lim (LKCNHM) for granting us access to specimens under his care, and Peter Ng for valuable insights during early drafts of the manuscript. We are also grateful to Daisy Wowor, Darren Yeo, Leong Tzi Ming, and Lim Cheng Puay for assistance and companionship in the field. Thanks to the handling editor Kevin Conway and an anonymous reviewer for improving the manuscript and timely reviews. This study was supported by funding from the Lee Kong Chian Natural History Museum, an AcRF Tier 1 Grant from the Singapore Ministry of Education (National University of Singapore Grant Number R-154-000-633-112), and the Ah Meng Memorial Conservation Fund (National University of Singapore Grant Number R-154-000-617-720).

Publisher Copyright:
© National University of Singapore.

Keywords

Clarias rennyae
Silurichthys insulanus
taxonomy
Southeast Asia

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.26107/RBZ-2022-0020

Cite this

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title = "Two new species of blackwater catfishes (Siluriformes: Siluridae and Clariidae) from the Natuna Archipelago, Indonesia",

abstract = "Two new species of blackwater catfishes are described from Pulau Natuna Besar of the Natuna Archipelago, Indonesia. Silurichthys insulanus (Siluridae), new species, differs from all congeners in having a combination of characters: eye diameter 8% HL; pectoral-fin length 16.0% SL; distinctly humped nuchal profile; 1 branched dorsal-fin ray; body depth at anus 16.0% SL; 54 anal-fin rays; caudal peduncle depth 5.7% SL; caudal fin asymmetrically forked, with 12 principal rays and upper lobe 1.1 times longer than lower lobe; and 50 vertebrae. Clarias rennyae (Clariidae), new species, is distinguished from all Southeast Asian congeners in having a combination of characters: anal-fin length 51.3–56.3% SL; body depth at anus 13.1–13.7% SL; head width 17.9–18.9% SL; distance between occipital process and dorsal-fin origin 6.8–8.9% SL; frontal fontanelle length 17.7–22.5% HL; anterior edge of pectoral spine with 19–31 irregular tiny asperities; and 65–68 total vertebrae. Both new species appear to be endemic to blackwater streams along the western coast of Pulau Natuna Besar.",

keywords = "Clarias rennyae, Silurichthys insulanus, taxonomy, Southeast Asia",

author = "LOW, {Bi Wei} and NG, {Heok Hee} and TAN, {Heok Hui}",

note = "Funding Information: We thank Kelvin Lim (LKCNHM) for granting us access to specimens under his care, and Peter Ng for valuable insights during early drafts of the manuscript. We are also grateful to Daisy Wowor, Darren Yeo, Leong Tzi Ming, and Lim Cheng Puay for assistance and companionship in the field. Thanks to the handling editor Kevin Conway and an anonymous reviewer for improving the manuscript and timely reviews. This study was supported by funding from the Lee Kong Chian Natural History Museum, an AcRF Tier 1 Grant from the Singapore Ministry of Education (National University of Singapore Grant Number R-154-000-633-112), and the Ah Meng Memorial Conservation Fund (National University of Singapore Grant Number R-154-000-617-720). Publisher Copyright: {\textcopyright} National University of Singapore.",

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N1 - Funding Information: We thank Kelvin Lim (LKCNHM) for granting us access to specimens under his care, and Peter Ng for valuable insights during early drafts of the manuscript. We are also grateful to Daisy Wowor, Darren Yeo, Leong Tzi Ming, and Lim Cheng Puay for assistance and companionship in the field. Thanks to the handling editor Kevin Conway and an anonymous reviewer for improving the manuscript and timely reviews. This study was supported by funding from the Lee Kong Chian Natural History Museum, an AcRF Tier 1 Grant from the Singapore Ministry of Education (National University of Singapore Grant Number R-154-000-633-112), and the Ah Meng Memorial Conservation Fund (National University of Singapore Grant Number R-154-000-617-720). Publisher Copyright: © National University of Singapore.

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N2 - Two new species of blackwater catfishes are described from Pulau Natuna Besar of the Natuna Archipelago, Indonesia. Silurichthys insulanus (Siluridae), new species, differs from all congeners in having a combination of characters: eye diameter 8% HL; pectoral-fin length 16.0% SL; distinctly humped nuchal profile; 1 branched dorsal-fin ray; body depth at anus 16.0% SL; 54 anal-fin rays; caudal peduncle depth 5.7% SL; caudal fin asymmetrically forked, with 12 principal rays and upper lobe 1.1 times longer than lower lobe; and 50 vertebrae. Clarias rennyae (Clariidae), new species, is distinguished from all Southeast Asian congeners in having a combination of characters: anal-fin length 51.3–56.3% SL; body depth at anus 13.1–13.7% SL; head width 17.9–18.9% SL; distance between occipital process and dorsal-fin origin 6.8–8.9% SL; frontal fontanelle length 17.7–22.5% HL; anterior edge of pectoral spine with 19–31 irregular tiny asperities; and 65–68 total vertebrae. Both new species appear to be endemic to blackwater streams along the western coast of Pulau Natuna Besar.

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