Loganellia scotica, TRAQUAIR, 1898

Taxonomy

Thelodont

Kingdom: Animalia
Phylum: Chordata Haeckel 1874
Class: Agnatha Cope 1889
Order: Katoporida Gross 1967
Family: Loganelliidae Karatajute-Talimaa 1997
Genus: Loganellia
Species: Loganellia scotica
Author Citation TRAQUAIR, 1898

Geological Time Scale

Eon: Phanerozoic
Era: Paleozoic
Period: Silurian
Sub Period: None
Epoch: Early
International Age: Llandovery

Stratigraphy

Priesthill Group
Patrick Burn Formation

Biostratigraphy

Jamoytius Horizon

Provenance

Collector: T. Bastelberger
Date Collected: 06/01/1977
Acquired by: Field Collection

Dimensions

Length: 5 cm

Location

Birk Knowes
Lesmahagow in Strathclyde
Scotland
United Kingdom

• lesmahagow
• loganellia
• scotland
• silurian
• tff-oilshale-ch976
• thelodont

Comments

Originally described as Thelodus scoticus Traquair, 1898.
Taxonomy from Märss & Ritchie 1997.
Revised diagnosis from Märss & Ritchie 1997, p. 150: "Scales medium-sized (up to 0-6 mm long), made up of crown, neck and base. Rostral scales not distinct. Crowns of cephalo-pectoral scales are rounded to rhomboidal with notches around the crown margin or only anteriorly; postpectoral and precaudal scales rhomboidal becoming more elongated posteriorly, median crown plate flat, smooth or with a notch anteriorly which becomes a furrow on the posteriorly situated scales. Beneath the median plate, the longitudinal ridges on the postero-lateral portions of the crown converge in the posterior crown apex. There are two types of pinnal scales. The scale crowns of the leading edges of all fins are flat, smooth and with two notches antero-laterally. The scales of the trailing edges of lateral and caudal fins are cuneiform. Neck of the scales is as a shallow groove, base rhomboidal with moderate spur anteriorly."
Traquair's original reconstruction in dorsal view:

Identified by oilshale.

References:
Traquair, R. H. (1898) Report on fossil fishes. Summary of Progress of the Geological Survey of the United Kingdom for 1897, 72-6.
Volume 16: Fossil Fishes of Great Britain. Chapter 2: Silurian fossil fishes sites of Scotland. Site: BIRK KNOWES (GCR ID: 359).
Žigaite· Ž. & Goujet D. (2012) New observations on the squamation patterns of articulated specimens of Loganellia scotica (Traquair, 1898) (Vertebrata: Thelodonti) from the Lower Silurian of Scotland. Geodiversitas 34 (2): 253-270.
Märss, T., & Ritchie, A. (1997) Articulated thelodonts (Agnatha) of Scotland. Transactions of the Royal Society of Edinburgh: Earth Sciences, 88(03), 143–195. doi:10.1017/s026359330000691x