New description and diagnosis of<i>Hyneria lindae</i>(Sarcopterygii, Tristichopteridae) from the Upper Devonian Catskill Formation in Pennsylvania, U.S.A.

Daeschler, Edward B.; Downs, Jason P.

doi:10.1080/02724634.2018.1448834

Cited by 15 publications

(47 citation statements)

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“…The study of all available material of Hyneria lindae (Daeschler & Downs 2018) suggests that this humerus probably belonged to a small-to-medium-sized individual. The current palaeohistological study shows that it was growing slowly, thereby implying that individuals of H. lindae already had relatively slow growth early in their life.…”

Section: Discussionmentioning

confidence: 99%

“…No bone cells of neotenic stereospondyls have been investigated to date. Compared to Eusthenopteron foordi , H. lindae displays certain characteristics that could be described as neotenic, most obviously the lack of neurocranial ossification, which contrasts with the well-ossified neurocranium of Eusthenopteron foordi (Jarvik 1980; Daeschler & Downs 2018). A poorly ossified neurocranium is also present in Eusthenodon wangsjoi , a giant tristichopterid from east Greenland that appears to be closely related to H. lindae (Jarvik 1952).…”

Section: Discussionmentioning

confidence: 99%

“…The size of ANSP 21483 relative to other skeletal elements of H. lindae suggests that it belongs to a small-to-medium-sized individual. ANSP 21483 comes from Red Hill, Duncannon Member of the Catskill Formation (Sevon 1985; Daeschler & Downs 2018), and is housed in the Vertebrate Paleontology collection of the Academy of Natural Sciences of Philadelphia (USA).

Figure 1Anatomy of the left humerus of Hyneria lindae (ANSP 21483).…”

Section: Methodsmentioning

confidence: 99%

“…The Red Hill locality is in the Duncannon Member of the Catskill Formation. This locality preserves a fossil record deposited in a well-vegetated alluvial plain forming meandering stream channels (Sevon 1985; Daeschler & Downs 2018) with a palaeoclimate of alternative wet and dry seasons at a palaeolatitude of approximately 30°S of the equator (Woodrow & Sevon 1985). The formation yields a diverse fauna comprising both arthropods (arachnids and myriapods) (Wilson et al .…”

mentioning

confidence: 90%

“…2003), acanthodians (Snyder et al . 2017), a chondrichthyan (Downs & Daeschler 2001), the small palaeoniscid actinopterygian Limnomis delaneyi (Daeschler 2000a), the tristichopterid H. lindae (Thomson 1968; Daeschler & Downs 2018) and some isolated skeletal elements of limbed stem tetrapods (Daeschler 2000b; Daeschler et al . 1994, 2009).…”

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confidence: 99%

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Long-bone development and life-history traits of the Devonian tristichopterid Hyneria lindae

Kamska¹,

Daeschler

Downs

et al. 2018

Earth and Environmental Science Transactions of the Royal Socie

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Hyneria lindae is one of the largest Devonian sarcopterygians. It was found in the Catskill Formation (late Famennian) of Pennsylvania, USA. The current study focuses on the palaeohistology of the humerus of this tristichopterid and supports a low ossification rate and a late ossification onset in the appendicular skeleton. In addition to anatomical features, the large size of the cell lacunae in the cortical bone of the humerus mid-shaft may suggest a large genome size and associated neotenic condition for this species, which could, in turn, be a partial explanation for the large size of H. lindae. The low metabolism of H. lindae revealed here by bone histology supports the hypothesis of an ambush predatory behaviour. Finally, the lines-of-arrested-growth pattern and late ossification of specimen ANSP 21483 suggest that H. lindae probably had a long juvenile stage before reaching sexual maturity. Although very few studies address the life-history traits of stem tetrapods, they all propose a slow limb development for the studied taxa despite different ecological conditions and presumably distinct behaviours. The bone histology of H. lindae would favour the hypothesis that a slow long-bone development could be a general character for stem tetrapods.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Figure 1Anatomy of the left humerus of Hyneria lindae (ANSP 21483).…”

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 90%