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Turseodus
Taxonomy
Turseodus was named by Leidy (1857). Its type is Turseodus acutus.
It was assigned to Turseoidae by Bock (1959); and to Palaeoniscidae by Hay (1902), Schaeffer (1952), Schaeffer (1967) and Irmis (2005).
It was assigned to Turseoidae by Bock (1959); and to Palaeoniscidae by Hay (1902), Schaeffer (1952), Schaeffer (1967) and Irmis (2005).
Species
T. acutus (type species), T. dolorensis
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Turseodus Leidy 1857
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†Turseodus acutus Leidy 1857
†Turseodus dolorensis Schaeffer 1967
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| B. Schaeffer 1952 | Elegantly fusiform fishes attaining a length of 15 to 20 cm. and differing from other members of the family Palaeoniscidae, sensu stricto, in the following combination of characters: Skull nearly one-fifth of total body length, transverse diameter of orbit about one-quarter of skull length. Ros- trum moderately projecting. Postrostral bone strongly constricted at external nares. Shape and relationship of frontal and dermopterotic essentially similar to other members of the Palaeoniscidae, sensu stricto. Parietal about one-third of length of frontal and nearly square. Single supraorbital and dermosphenotic in contact with nasal. Maxillary excluded from snout, not meeting fellow below rostrum. Suspensorium oblique, preopercular-maxillary angle about 33 degrees. Opercular deeper than wide, twice the depth of subopercular. Dermohyal or antopercular present. Mandible robust, with broad symphysis. Maxillary and dentary with one or more rows of conical, laniariform teeth, alternating with more numerous smaller teeth. Dermal bones covered with low rugae or tubercles; ornamentation weakest on opercular and subopercular.
Supracleithrum broad and ornamented with low rugae. Cleithrum with attenuated dorsal extension. Pectoral fin large, horizontal, consisting of about 17 lepidotrichia which are segmented for about one-half of their length. Pelvic fin much smaller than pectoral, triangular, origin about midway between origins of pectoral and anal, number of lepidotrichia unknown. Dorsal fin remote, origin well behind that of anal, consisting of about 25 lepidotrichia. Anal fin long-based, nearly equal to skull length, with concave ventral margin, and consisting of about 55 lepidotrichia. Caudal fin deeply cleft, nearly equilobate, body axis extending to tip of dorsal lobe, with about 65 lepidotrichia in both lobes. Small fulcra on the anterior borders of all fins. One or more ridge scales in front of dorsal and anal fins. Scales ornamented with low diagonal and occasionally branch- ing ridges, with prominent dorsal articular process, and with smooth posterior border. Ganoine and bony layers present, arranged essentially as in Glaucolepis. Cosmine layer reduced or absent. |
Measurements
No measurements are available
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| Source: o = order, subp = subphylum | |||||
| References: Carroll 1988, Hendy et al. 2009 | |||||
Collections (31 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Carnian | USA (Texas) | T. sp. (84271) | |
| Carnian | USA (North Carolina) | T. sp. (227824) | |
| Carnian - Norian | USA (Texas) | T. sp. (22704 22706) | |
| Carnian - Norian | USA (North Carolina) | T. spp. (89149) | |
| Norian | USA (Pennsylvania) | Lysorocephalus gwyneddensis (99375) T. acutus (107421 221019) | |
| Norian | USA (Texas) | T. sp. (13266 48424 84269) | |
| Norian | USA (New Mexico) | T. sp. (55248) | |
| Norian | USA (Arizona) | Palaeoniscidae indet. (39160 48423) T. dolorensis (84017) T. sp. (39219 48547 84265 92850) | |
| Norian | USA (North Carolina) | T. sp. (55493) | |
| Norian | USA (New Jersey) | T. acutus (12856 190915) T. sp. (91743 187290 187317 187318 187319 227832) | |
| Norian - Rhaetian | USA (Colorado) | T. dolorensis (135699) | |
| Lacian - Sevatian | USA (New Mexico) | T. sp. (62311) | |
| Rhaetian | USA (Utah) | T. sp. (218214) |