Sunday, January 20, 2019

[Paleontology • 2018] Phatthalungoceras srisuki • A New Genus and Species of Triassic Nautiloid Cephalopod (Cephalopoda: Orthoceratoidea, Orthoceratidae) from Eastern Peninsular Thailand


 Phatthalungoceras srisuki  

Tongtherm & Nabhitabhata, 2018

Abstract  
Phatthalungoceras srisuki gen. et sp. nov. (Orthoceratidae) has been collected from Khao Ok-Thalu, Chaiburi Formation, Triassic Strata in Phatthalung province, in eastern peninsular Thailand and is described as a new genus and species based on the characteristics of the internal mold of the phragmocone. The new genus is distinguished from other family members by its elliptical cross section of the conch as well as suborthochoanitic septal neck and free endosiphuncular deposit. Ornamentation is absent.

Keywords: new genus, new species, Triassic, nautiloid, Thailand

Figure 2. Phatthalungoceras srisuki of the phragmocone with suture on the posterior;
 2a. and 2b. cross section of anterior view of the phragmo5b. ventral view of the phragmocone with suture on the anterior; 5c. posterior view of the phragmocone with central siphuncle; 5d. cross section in posterior; 5e. and 5f. segmented siphuncle and suborthochoanitic septal neck at the posterior. Scale bar = 10 mm.


Kittichai Tongtherm and Jaruwat Nabhitabhata. 2018. Phatthalungoceras srisuki, A New Genus and Species of Triassic Nautiloid Cephalopod (Cephalopoda: Orthoceratoidea, Orthoceratidae) from Eastern Peninsular Thailand. Phuket Marine Biological Center Research Bulletin. 75:13-18. 

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