Abstract
The lateral line system allows elasmobranchs to detect hydrodynamic movements in their close surroundings. We examined the distribution of pit organs and lateral line canals in 4 species of sawfish (Anoxypristis cuspidata, Pristis microdon, P. clavata and P. zijsron). Pit organs could only be located in A. cuspidata, which possesses elongated pits that are lined by dermal denticles. In all 4 pristid species, the lateral line canals are well developed and were separated into regions of pored and non-pored canals. In all species the tubules that extend from pored canals form extensive networks. In A. cuspidata, P. microdon and P. clavata, the lateral line canals on both the dorsal and ventral surfaces of the rostrum possess extensively branched and pored tubules. Based on this morphological observation, we hypothesized that these 3 species do not use their rostrum to search in the substrate for prey as previously assumed. Other batoids that possess lateral line canals adapted to perceive stimuli produced by infaunal prey possess non-pored lateral line canals, which also prevent the intrusion of substrate particles. However, this hypothesis remains to be tested behaviourally in pristids. Lateral line canals located between the mouth and the nostrils are non-pored in all 4 species of sawfish. Thus this region is hypothesized to perceive stimuli caused by direct contact with prey before ingestion. Lateral line canals that contain neuromasts are longest in P. microdon, but canals containing neuromasts along the rostrum are longest in A. cuspidata.
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References
1.
Breder CM (1952): On the utility of the saw of the sawfish. Copeia 2:90–91.
2.
Budker P (1938): Les cryptes sensorielles et les denticules cutanés des plagiostomes. Ann Inst Oceanogr 18:207–288.
3.
Cappetta H (1974): Sclerorhynchidae nov. fam., Pristidae et pristiophoridae: un exemple de parallélisme chez les Sélaciens. C R Acad Sci Paris Ser D 278:225–228.
4.
Chu YT, Wen MC (1979): A study of the lateral-line canal system and that of the Lorenzini ampullae and tubules of elasmobranchiate fishes of China. Monograph of Fishes of China. 2. Shanghai, Academic Press, p 132.
5.
Compagno LJV (1999): Endoskeleton; in Hamlett WC (ed): Sharks, Skates and Rays. The Biology of Elasmobranch Fishes. Baltimore, John Hopkins University Press, pp 69–92.
6.
Coombs S, Braun CB (2003): Information processing by the lateral line system; in Collin SP, Marshall NJ (eds): Sensory Processing in Aquatic Environments. New York, Springer, pp 122–138.
7.
Deynat PP (2005): New data on the systematics and interrelationships of sawfishes (Elasmobranchii, Batoidea, Pristiformes). J Fish Biol 66:1447–1458.
8.
Dijkgraaf S, Kalmijn AJ (1963): Untersuchungen über die Funktion der Lorenzinischen Ampullen an Haifischen. Z Vgl Physiol 47:438–456.
9.
Hoffmann L (1912): Zur Kenntnis des Neurocraniums der Pristiden und Pristiophoriden. Zool Jahrb 33:239–360.
10.
Kalmijn AJ (1989): Functional evolution of the lateral line and inner ear sensory systems; in Coombs S, Görner P, Münz H (eds): The Mechanosensory Lateral Line: Neurobiology and Evolution. New York, Springer, pp 187–216.
11.
Kasumyan AO (2003): The lateral line in fish: structure, function and role in behaviour. J Ichtyol Res 43:S175–S203.
12.
Last PR, Stevens JD (2009): Sharks and Rays of Australia, ed 2. Collingwood, CSIRO Australia.
13.
Maruska KP (2001): Morphology of the mechanosensory lateral line system in elasmobranch fishes: ecological and behavioural considerations. Environ Biol Fishes 60:47–75.
14.
Maruska KP, Tricas TC (2004): Test of the mechanotactile hypothesis: neuromast morphology and response dynamics of mechanosensory lateral line primary afferents in the stingray. J Exp Biol 207:3463–3476.
[PubMed]
15.
Marzullo TM, Wueringer BE, Squire L Jr, Collin SP (2011): Description of the mechanoreceptive lateral line and electroreceptive ampullary systems in the freshwater whipray, Himantura dalyensis. Mar Freshw Res 62:1–9.
16.
McEachran JD, Dunn KA, Miyake T (1996): Interrelationships of the batoid fishes (Chondrichthyes: Batoidea); in Stiassney M, Parenti L, Johnson D (eds): Interrelationships of Fishes. New York, New York Academic Press, pp 63–83.
17.
Montgomery J, Coombs S, Halstead M (1995): Biology of the mechanosensory lateral line in fishes. Rev Fish Biol Fish 5:399–416.
18.
Peach MB (2003): Inter- and intraspecific variation in the distribution and number of pit organs (free neuromasts) of sharks and rays. J Morphol 256:89–102.
[PubMed]
19.
Peach MB, Marshall NJ (2009): The comparative morphology of pit organs in elasmobranchs. J Morphol 270:688–701.
[PubMed]
20.
Peach MB, Rouse GW (2004): Phylogenetic trends in the abundance and distribution of pit organs of elasmobranchs. Acta Zool (Stockh) 85:233–244.
21.
Peverell SC (2006): Distribution of sawfishes (Pristidae) in the Queensland Gulf of Carpenteria, Australia, with notes on sawfish ecology. Environ Biol Fishes 73:391–402.
22.
Rouse GW, Pickles JO (1991): Ultrastructure of free neuromasts of Bathygobius fuscus (Gobiidae) and canal neuromasts of Apogon cyanosoma (Apogonidae). J Morphol 209:111–120.
23.
Schaeffer B (1963): Cretaceous fishes from Bolivia, with comments on pristid evolution. Am Mus Novit 2159:1–20.
24.
Taniuchi T, Shimizu M, Sano M, Baba O (1991): Descriptions of freshwater elasmobranchs collected from three rivers in northern Australia; in Shimizu M, Taniuchi T (eds): Studies on Elasmobranchs Collected from Seven River Systems in Northern Australia and Papua New Guinea. Tokyo, Univ Mus Univ Tokyo, Nature and Culture, No. 3, pp 11–26.
25.
Thorburn DC, Morgan DL, Rowland AJ, Gill HS, Paling E (2008): Life history notes of the critically endangered dwarf sawfish, Pristis clavata, Garman 1906 from the Kimberley region of Western Australia. Environ Biol Fishes 83:139–145.
26.
Wilga CD, Motta PJ (1998): Feeding mechanism of the Atlantic guitarfish Rhinobatos lengtinosus: modulation of kinematic and motor activity. J Exp Biol 210:3167–3184.
27.
Wueringer BE, Peverell SC, Seymour J, Squire L Jr, Kajiura SM (2011): Sensory systems in sawfishes. 1. The ampullae of Lorenzini. Brain Behav Evol, DOI 329515.
28.
Wueringer BE, Squire L, Collin SP (2009): The biology of extinct and extant sawfish (Batoidea: Sclerorhynchidae and Pristidae). Rev Fish Biol Fish 19:445–464.
29.
Wueringer BE, Tibbetts IR (2008): Comparison of the lateral line and ampullary system of two species of shovelnose ray. Rev Fish Biol Fish 18:47–64.
© 2011 S. Karger AG, Basel
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