Trackways Produced by Lungfish During Terrestrial Locomotion.
Some primarily aquatic vertebrates make brief forays onto land, creating traces as they do. A lack of studies on aquatic trackmakers raises the possibility that such traces may be ignored or misidentified in the fossil record. Several terrestrial Actinopterygian and Sarcopterygian species have previously been proposed as possible models for ancestral tetrapod locomotion, despite extant fishes being quite distinct from Devonian fishes, both morphologically and phylogenetically. Although locomotion has been well-studied in some of these taxa, trackway production has not. We recorded terrestrial locomotion of a 35 cm African lungfish (Protopterus annectens; Dipnoi: Sarcopterygii) on compliant sediment. Terrestrial movement in the lungfish is accomplished by planting the head and then pivoting the trunk. Impressions are formed where the head impacts the substrate, while the body and fins produce few traces. The head leaves a series of alternating left-right impressions, where each impact can appear as two separate semi-circular impressions created by the upper and lower jaws, bearing some similarity to fossil traces interpreted as footprints. Further studies of trackways of extant terrestrial fishes are necessary to understand the behavioural repertoire that may be represented in the fossil track record.
Liverpool John Moores University, School of Natural Sciences and Psychology, Liverpool, UK.
Peter L
PL
Falkingham
Department of Biology, California State University San Bernardino, San Bernardino, California, USA.
Angela M
AM
Horner
J Morphol. 2014 Apr;275(4):431-41
24741713
J Exp Zool A Ecol Genet Physiol. 2016 Jan;325(1):57-64
26537331
Nature. 2008 Jun 26;453(7199):1199-204
18580942
J Exp Biol. 2011 Feb 15;214(Pt 4):530-7
21270300
Proc Natl Acad Sci U S A. 2011 Dec 27;108(52):21146-51
22160688
Nature. 2010 Jan 7;463(7277):43-8
20054388
PLoS One. 2014 May 02;9(5):e96516
24788982
Science. 2016 Jul 8;353(6295):154-8
27387947
Zoology (Jena). 2013 Jun;116(3):144-50
23477972
Nature. 2012 Jun 28;486(7404):523-6
22722854
J Exp Biol. 2000 Feb;203(Pt 3):471-80
10637176
PLoS One. 2010 Aug 09;5(8):e11998
20711249
J Fish Biol. 2014 Mar;84(3):639-60
24502775
Anat Rec. 1946 Jul;95:257-81
20995919
J Morphol. 1988 Aug;197(2):159-81
3184194
J Exp Zool A Ecol Genet Physiol. 2007 Sep 1;307(9):542-7
17620306
Integr Comp Biol. 2013 Aug;53(2):295-306
23704366
Integr Comp Biol. 2013 Aug;53(2):209-23
23624864
Nature. 2002 Aug 15;418(6899):767-70
12181564
Sci Rep. 2016 Mar 24;6:23711
27010864
Proc Natl Acad Sci U S A. 2014 Jan 21;111(3):893-9
24449831
Integr Comp Biol. 2013 Aug;53(2):283-94
23667046
J Exp Biol. 2009 Sep 15;212(18):2949-59
19717677
Biol Cybern. 2013 Oct;107(5):529-44
23250621
J Exp Biol. 2009 Jul;212(Pt 14):2279-86
19561218
Zoology (Jena). 2004;107(2):111-20
16351932
J Exp Biol. 2008 Nov;211(Pt 22):3523-8
18978215
IEEE Trans Pattern Anal Mach Intell. 2010 Aug;32(8):1362-76
20558871