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 | |
| Publication status | Published - 1 Jul 2022 |
Bibliographical note
Publisher Copyright:© National University of Singapore.
Funding
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).
Keywords
- Clarias rennyae
- Silurichthys insulanus
- taxonomy
- Southeast Asia
