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Pinnalongus saxoni (lungfish)

Taxonomy
Pinnalongus saxoni was named by Newman and den Blaauwen (2007). Its type specimen is NMSG.1987.7.121p&cp, a partial skeleton, and it is a 3D body fossil. It is the type species of Pinnalongus.

Synonymy list
YearName and author
2007Pinnalongus saxoni Newman and den Blaauwen

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
RankNameAuthor
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnoiMüller 1884
genusPinnalongusNewman and den Blaauwen 2007
speciessaxoniNewman and den Blaauwen 2007

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.

Diagnosis
ReferenceDiagnosis
M. J. Newman and J. L. den Blaauwen 2007Adults up to 300 mm in total length. The anterior dorsal fin is small compared with the large, long posterior dorsal fin. The ratio between the prepineal length to the total length of the skull roof is about 1 : 1. The ratio between the preorbital length (the edge of the snout to the preorbital margin) to postorbital length (the postorbital margin to the operculum) is about 2·6. The anterior part of the skull roof is composed of a mosaic of small bones. Anterior of bone D and C-bones; these bones number at least 50. The posterior of the skull roof has the I-bones not meeting medially behind the B-bone. There is a pair of C-bones. The C-bones are c. 1·5 times as long as wide. The B-bone is c. 1·25 times as long as wide. A single bone D is present. There is one paired Y-bone. There are individual paired X- and K-bones. Bone-Y, bone-4 and bone-X appear to contact the operculum in the holotype (but the situation with bone-X is not so clear in NMSG.1987.7.120 where there is no obvious contact with the operculum). Long circumorbital bones are present with the most dorsal bone (bone-3) being particularly large. There is a high cheek region with the operculum being short and deep. The G3-bone is fairly broad. Tooth plates are present where the angle between the outer and inner denticle rows of the upper tooth plate is less than 60 degrees. Scales and dermal bones are often cosmine-covered. Where the scales are not covered in cosmine, the ornamentation consists of a front quarter of fine, slightly longitudinal ridges with the back three-quarters consisting of fine striations. The scales are more rhomboidal near the fins. The anal fin is long and pointed. The pelvic fin is positioned more anteriorly than similar-sized D. valenciennesi specimens.