Lorentz Grunter, Pingalla lorentzi (Weber 1910)
Lorentz Grunter, Pingalla lorentzi. Source: Dave Wilson. License: all rights reserved
Lorentz Grunter, Pingalla lorentzi (Weber 1910)
More Info
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Distribution |
Occurs from the Finnis River, NT and Cockatoo Creek (11º40´S) to the Jardine River (11º10´S), QLD in northern Australia and in New Guinea. Inhabits small to large pools in freshwater streams, usually in the open, unshaded sections with rocky or sandy bottoms. |
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Features |
Meristic features: Dorsal fin XIII-XIV, 11.13; Anal fin III, 8-9; Pectoral fin 15; Pelvic fin I, 5; Lateral line scales 48-54; Transverse scales 6-7/1/13-14; Gill rakers 6+1+11-12; Vertebrae 11+14. Body moderately deep, 2.3-2.5 in SL, ovate, compressed; dorsal profile more pronounced than ventral, straight from snout to dorsal origin; ventral profile straight or slightly convex to pelvic insertion, then straight to anus. Head length 2.6-3.6 in SL; snout length 3.1-3.2 in SL; eye width 3.6-4.5 in HL. Interorbital region smooth. Mouth small, practically nonprotractile, posterior end of maxillary strongly curved ventrally; jaws equal or upper slightly longer; length 4.0-4.5 in HL; gape oblique; maxillary reaching to middle of snout, approximately to vertical through region between anterior and posterior nostrils; teeth depressible, distinctly flattened, brown-tipped; 2 rows of dentition in each jaw, outer row distinctly enlarged, inner row smaller, less flattened, embedded in fleshy tissue; no teeth on vomer or palatines. Lacrimal serrate posteriorly. Preoperculum serrate; serrations strongest on vertical edge. Lower opercular spine stronger and longer; not extending beyond edge of opercular lobe. Posttemporal exposed; serrate along posterior edge. Cleithrum exposed; serrate posteriorly; scales on side. Supracleithrum exposed. Scales finely ctenoid; lateral line continuous, smoothly curved; 5-6 scales on caudal; scales above lateral line; scales below lateral line-, 11 pre dorsal scales to occiput; two irregular series of scales in sheath at base of dorsal fin, sheath extending to seventh or eighth dorsal ray; three rows of scales in sheath at base of anal fin, sheath extending to fifth anal ray; cheek scales in five rows.. Dorsal fin continuous, base 1.6-1.8 in SL; spinous portion strongly arched; first spine very short; fifth to seventh spine longest, 1.7-2.0 in HL, those following decreasing in length to penultimate, which is slightly longer than last; longest dorsal spines longer than longest dorsal rays, longest dorsal ray 2.0-2.1 in HL, soft dorsal with posterior edge straight; corners rounded. Second anal spine longest, 1.7-2.0 in HL, twice as long as first spine; not as long as longest anal rays, longest anal ray 1.8-2.2 in HL; soft anal rounded. Pectoral fins asymmetrically pointed; fourth ray longest. Pelvic fins pointed; first ray longest; slightly filamentous; reaching to anus or falling slightly short. Caudal fin emarginate. |
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Size |
To around 21 cm SL. |
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Colour |
Body uniformly dark, especially along back; scales of side and belly with a central silvery hue. Head dark above, paler ventrally. Dorsal fin dusky with paler margins. Anal fin dusky, edges pale. Pectoral and pelvic fins dusky. |
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Feeding |
Omnivores - feeds primarily on benthic algae, which is scraped from rocks and woody debris with flattened teeth. |
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Biology |
Oviparous demersal spawners. Spawning is likely to occur from November to February. |
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Etymology |
The name lorentzi honours H. A. Lorentz, a member of the expedition that collected the type series. |
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Species Citation |
Helotes lorentzi Weber, 1910, Notes Leyden Mus. 32(4): 236. Type locality: Lorentz River, New Guinea. |
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Author |
Martin F. Gomon |
Lorentz Grunter, Pingalla lorentzi (Weber 1910)
References
Allen, G.R. & Hoese, D.F. (1980). A collection of fishes from the Jardine River, Cape York Peninsula, Australia. J. R. Soc. West. Aust. 63(2): 53–61 figs 1–2.
Allen, G.R., Midgley, S.H. & Allen, M. (2002). Field guide to the freshwater fishes of Australia. Perth : Western Australian Museum 394 pp.
Vari, R.P. (1978). The terapon perches (Percoidei, Terapontidae) a cladistic analysis and taxonomic revision. Bull. Amer. Mus. Nat. Hist. 159(5): 175–340 figs 1–94.
Weber, M. (1910). Neue Fische aus Niederländisch Süd-Neu-Guinea. Notes Leyden Mus. 32(4): 225–240 fig. 3
