Trace fossil
Haplotichnus is an ichnogenus of invertebrate trace fossil that was erected by S.A. Miller in 1889. Buatois et al. (1998) proposed that "Haplotichnus" should be synonymized with "Gordia" because both exhibit a looping course with self-crossing. Other researchers, such as Wang et al. (2009), have maintained the distinction between the two ichnogenera because "Haplotichnus" has sharp bends, whereas those of "Gordia" are not sharp. Most recently, Getty and Bush (2016) synonymized "Haplotichnus" with "Treptichnus" due to the presence of bifurcating projections at the bends. Other features, such as the looping course of the trace, thought to distinguish "Haplotichnus" from "Treptichnus", are actually seen in one of the syntypes of "Treptichnus", further supporting Getty and Bush's (2016) synonymy.
References.
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