Eoscopus
| Eoscopus | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Tetrapoda |
| Order: | †Temnospondyli |
| Genus: | †Eoscopus Daly, 1994 |
| Species: | †E. lockardi |
| Binomial name | |
| †Eoscopus lockardi Daly, 1994 | |
Eoscopus is an extinct monospecific genus of amphibamiform temnospondyl that is probably in the dissorophoid family Micropholidae. It is known from Hamilton Quarry, a Pennsylvanian lagerstätte near Hamilton, Kansas.[1]
History of study
[edit]Eoscopus was formally described for the type and only species, E. lockardi, by Daly (1994) based on material from the Hamilton Quarry.[1] The generic epithet derives from the Greek eo ("dawn") and skopos ("watcher"), and the species epithet honors Walter Lockard, who discovered the first vertebrate fossil at the site.[1]
Anatomy
[edit]Eoscopus lockardi is known from more than two dozen specimens, many of which comprise partial to complete skeletons.[1] Daly diagnosed it as having (1) a relatively narrow interorbital region; (2) eight pairs of shoulder ribs beginning from the axis, with the first five being more robust; (3) a single pair of spatulate sacral ribs; (4) deep contact between the two halves of the pelvis for their anterior two-thirds; and (5) knobbed terminal phalanges.[1] Schoch & Milner (2014) retained some of these features in their revised diagnosis, which includes: (1) narrow interorbital region and large orbits; (2) dense mosaic of palpebral ossicles; (3) narrow distance between otic notch and orbit; (4) frontal entering the orbit; (5) large pleurocentra that nearly meet ventrally; (5) a relatively long skull table; and (7) a palatine-pterygoid contact.[2] Compared to many other amphibamiforms, especially non-branchiosaurids, essentially the entire skeleton is known.
Phylogenetic relationships
[edit]Daly (1994), following on previous conjecture,[3][4] separated several taxa historically placed in Dissorophidae into Amphibamidae, including Amphibamus, Doleserpeton, Eoscopus, and Tersomius. Significant work on this group of small-bodied dissorophoids has led to further nomenclatural changes such that Amphibamidae is now restricted to Amphibamus, Doleserpeton, and Platyrhinops.[5] Eoscopus is typically recovered within or near the Micropholidae, another family within the larger Amphibamiformes,[5][6][7] although other results have been found.[8]
There has been some speculation that multiple taxa are represented in the set of material assigned to E. lockardi.[2]
See also
[edit]References
[edit]- 1 2 3 4 5 Daly, Eleanor (1994-02-17). "The Amphibamidae (Amphibia: Temnospondyli) with a Description of a New Genus from the Upper Pennsylvanian of Kansas". The University of Kansas Natural History Museum Miscellaneous Publications. 85: 1–59.
- 1 2 Schoch, Rainer R.; Milner, Andrew R. (2014). Sues, Hans-Dieter (ed.). Handbook of Paleoherpetology Band: 3A2: Temnospondyli I. Verlag Dr. Friedrich Pfeil. ISBN 978-3-89937-170-3.
- ↑ Boy, Jürgen A. (1985-01-29). "Micropholis the last surviving dissorophoid (Amphibia, Temnospondyli; Lower Triassic)". Neues Jahrbuch für Geologie und Paläontologie - Monatshefte. 1985 (1): 29–45. doi:10.1127/njgpm/1985/1985/29. ISSN 0028-3630.
- ↑ Berman, David S; Reisz, Robert R.; Eberth, David A. (1987-09-16). "A new genus and species of trematopid amphibian from the Late Pennsylvanian of north-central New Mexico". Journal of Vertebrate Paleontology. 7 (3): 252–269. Bibcode:1987JVPal...7..252B. doi:10.1080/02724634.1987.10011659. ISSN 0272-4634.
- 1 2 Schoch, Rainer R. (2019). "The putative lissamphibian stem-group: phylogeny and evolution of the dissorophoid temnospondyls". Journal of Paleontology. 93 (1): 137–156. Bibcode:2019JPal...93..137S. doi:10.1017/jpa.2018.67. S2CID 134075457.
- ↑ Schoch, Rainer R. (2022-10-05). "Phylogeny of the amphibamiform temnospondyls: the relationship of taxa known by adults, larvae and neotenes". Journal of Systematic Palaeontology. 20 (1): 1–30. Bibcode:2022JSPal..2013831S. doi:10.1080/14772019.2022.2113831. ISSN 1477-2019.
- ↑ Schoch, Rainer R.; Werneburg, Ralf (July 2023). "Adult branchiosaurid temnospondyls: the life cycle of Xerodromeus gracilis". Papers in Palaeontology. 9 (4) e1513. Bibcode:2023PPal....9E1513S. doi:10.1002/spp2.1513. ISSN 2056-2799.
- ↑ So, Calvin; Pardo, Jason D; Mann, Arjan (2024-12-28). "A new amphibamiform from the Early Permian of Texas elucidates patterns of cranial diversity among terrestrial amphibamiforms". Zoological Journal of the Linnean Society. 203 (1) zlae012. doi:10.1093/zoolinnean/zlae012. ISSN 0024-4082.
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