Aulopora: A Form-Genus of Tabulate Corals and Bryozoans

Fenton, Mildred Adams; Fenton, Carroll Lane

doi:10.2307/2420620

Cited by 8 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some auloporid taxa have been confused with hederelloids in the past (Fenton & Fenton, 1937; Elias, 1944) and can be hard to differentiate when taphonomic conditions have degraded the quality of the specimen due to gross morphological similarities.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

3D-Analysis of a non-planispiral ammonoid from the Hunsrück Slate: natural or pathological variation?

Stilkerich

Smrecak

Baets

2017

PeerJ

View full text Add to dashboard Cite

We herein examine the only known non-planispirally coiled early Devonian ammonoid, the holotype specimen of Ivoites opitzi, to investigate if the host was encrusted in vivo and if these sclerobionts were responsible for the trochospiral coiling observed in this unique specimen. To test if the presence of runner-like sclerobionts infested the historically collected specimen of Ivoites opitzi during its life, we used microCT to produce a three-dimensional model of the surface of the specimen. Our results indicate that sclerobionts grew across the outer rim (venter) on both sides of the ammonoid conch at exactly the location where the deviation from the planispiral was recognized, and where subsequent ammonoid growth would likely preclude encrustation. This indicates in vivo encrustation of the I. opitzi specimen, and represents the earliest documentation of the phenomenon. Further, this suggests that non-planispiral coiling in I. opitzi was likely pathologically induced and does not represent natural morphological variation in the species. Despite the observed anomalies in coiling, the specimen reached adulthood and retains important identifying morphological features, suggesting the ammonoid was minimally impacted by encrustation in life. As such, appointing a new type specimen—as suggested by some authors—for the species is not necessary. In addition, we identify the sclerobionts responsible for modifying the coiling of this specimen as hederelloids, a peculiar group of sclerobionts likely related to phoronids. Hederelloids in the Devonian are commonly found encrusting on fossils collected in moderately deep environments within the photic zone and are rarely documented in dysphotic and aphotic samples. This indicates that when the ammonoid was encrusted it lived within the euphotic zone and supports the latest interpretations of the Hunsrück Slate depositional environment in the Bundenbach-Gemünden area.

show abstract

Section: Discussionmentioning

confidence: 99%

“…Some taxa of auloporid corals have traditionally been confused with other sclerobionts with runner-like morphologies (Lescinsky, 2001) like hederelloids and cyclostomate bryozoans (Fenton & Fenton, 1937; Elias, 1944; Bancroft, 1986). …”

Section: Introductionmentioning

confidence: 99%

3D-Analysis of a non-planispiral ammonoid from the Hunsrück Slate: natural or pathological variation?

Stilkerich

Smrecak

Baets

2017

PeerJ

View full text Add to dashboard Cite

show abstract

“…An additional goal is to identify the identity of the sclerobionts, which were preliminary determined to be auloporid tabulate corals (De Baets et al 2013). Some taxa of auloporid corals have traditionally been confused with other sclerobionts with runner-like morphologies (Lescinsky 2001) like hederelloids and cyclostomate bryozoans (Fenton & Fenton 1937;Elias 1944;Bancroft 1986).…”

Section: Introductionmentioning

confidence: 99%

Peer Review #1 of "3D-Analysis of a non-planispiral ammonoid from the Hunsrück Slate: natural or pathological variation? (v0.1)"

Wani¹

2017

View full text Add to dashboard Cite

We herein examine the only known non-planispirally coiled early Devonian ammonoid, the holotype specimen of Ivoites opitzi, to investigate if the host was encrusted in vivo and if these sclerobionts were responsible for the trochospiral coiling observed in this unique specimen. To test if the presence of runner-like sclerobionts infested the historically collected specimen of Ivoites opitzi during its life, we used microCT to produce a threedimensional model of the surface of the specimen. Our results indicate that sclerobionts grew across the outer rim (venter) on both sides of the ammonoid conch at exactly the location where the deviation from the planispiral was recognized, and where subsequent ammonoid growth would likely preclude encrustation. This indicates in vivo encrustation of the I. opitzi specimen, and represents the earliest documentation of the phenomenon. Further, this suggests that non-planispiral coiling in I. opitzi was likely pathologically induced and does not represent natural morphological variation in the species. Despite the observed anomalies in coiling, the specimen reached adulthood and retains important identifying morphological features, suggesting the ammonoid was minimally impacted by encrustation in life. As such, appointing a new type specimen-as suggested by some authors-for the species is not necessary. In addition, we identify the sclerobionts responsible for modifying the coiling of this specimen as hederelloids, a peculiar group of sclerobionts likely related to phoronids. Hederelloids in the Devonian are commonly found encrusting on fossils collected in moderately deep environments within the photic zone and are rarely documented in dysphotic and aphotic samples. This indicates that when the ammonoid was encrusted it lived within the euphotic zone and supports the latest interpretations of the Hunsrück Slate depositional environment in the Bundenbach-Gemünden area.

show abstract

“…The runner-like encrusters were initially thought to be auloporid corals (De ), which are known to encrust brachiopods (Zapalski 2005;Mistiaen et al 2012) and ammonoids (Klug & Korn 2001) during their lifetime. Some auloporid taxa have been confused with hederelloids in the past (Fenton & Fenton 1937;Elias 1944) and can be hard to differentiate when taphonomic conditions have degraded the quality of the specimen due to gross morphological similarities.…”

Section: Identity Of the Encrustersmentioning

confidence: 99%

“…An additional goal is to identify the identity of the sclerobionts, which were preliminary determined to be auloporid tabulate corals (De . Some taxa of auloporid corals have traditionally been confused with other sclerobionts with runner-like morphologies (Lescinsky 2001) like hederelloids and cyclostomate bryozoans (Fenton & Fenton 1937;Elias 1944;Bancroft 1986).…”

Section: Introductionmentioning

confidence: 99%

Untitled

Supplemental Information 1: Video of the Three-Dimensional Model of KGM 1983/147

View full text Add to dashboard Cite

show abstract

Aulopora: A Form-Genus of Tabulate Corals and Bryozoans

Cited by 8 publications

References 0 publications

3D-Analysis of a non-planispiral ammonoid from the Hunsrück Slate: natural or pathological variation?

3D-Analysis of a non-planispiral ammonoid from the Hunsrück Slate: natural or pathological variation?

Peer Review #1 of "3D-Analysis of a non-planispiral ammonoid from the Hunsrück Slate: natural or pathological variation? (v0.1)"

Untitled

Contact Info

Product

Resources

About