Makowskia laticephala, Klembara, 2005

Klembara, Jozef, 2005, A new discosauriscid seymouriamorph tetrapod from the Lower Permian of Moravia, Czech Republic, Acta Palaeontologica Polonica 50 (1), pp. 25-48 : 26-28

Makowskia laticephala sp. nov.

Figs. 1–9 .

Etymology: From Latin latus, broad and Greek kefalé, head.

Holotype: SNM Z 26506 , skull and anterior portion of postcranial skeleton, is the only known specimen, and is deposited in the collections of the Slovak National Museum in Bratislava ( SNM).

Locality and horizon: Boskovice Furrow in Moravia ( Czech Republic); Kochov−L, about 500 m NE of the village Kochov (near city Letovice) ( Klembara and Meszároš 1992). Bačov horizon, zone 6, Lower Saxonian (sensu Werneburg 1989), Lower Permian.

Diagnosis.—Autapomorphies relative to discosauriscids Discosauriscus and Ariekanerpeton include: nasal bones equally long as broad; interorbital region broad; prefrontal−postfrontal contact lies in level of frontal mid−length (differs only from D. pulcherrimus ); maxilla deepest at its mid−length; suborbital ramus of jugal short and dorsoventrally broad with long anterodorsal−posteroventral directed lacrimal−jugal suture; postorbital anteroposteriorly short and lacks elongated posterior process; ventral surface of basioccipital smooth; rows of small denticles placed on distinct ridges and intervening furrows radiate from place immediately laterally to articular portion on ventral surface of palatal ramus of pterygoid (only from D. pulcherrimus ); oblique anterior margin of transverse flange of pterygoid directed anteromedially−posterolaterally; cultriform process of parasphenoid relatively short and slightly rounded; ventral surface of the posterior plate of parasphenoid heavily sculptured (only from D. pulcherrimus and Ariekanerpeton ); distal ends of fourth and fifth presacral ribs distinctly anteroposteriorly broadened, and extend into the hook−like, posteriorly directed processes; shaft of?last caudal rib anteroposteriorly broadened; posterior stem of interclavicle narrows anteriorly and posteriorly from broadened mid−length section.

Remarks.—The degree of ossification of the skeleton, the type of ornamentation and sutures of skull roof bones of SNM Z 26506 correspond to the similar−sized specimens of Discosauriscus austriacus ( Klembara 1995, 1997).

Makowskia laticephala is compared with similar−sized specimens of Discosauriscus austriacus and D. pulcherrimus ( Klembara 1997; Klembara and Bartík 2000).

Figures

Fig. 1. Makowskia laticephala gen. et sp. nov., SNM Z 26506. Photograph of holotype skull (A) and explanatory drawing of the same (B) in dorsal view.

Fig. 2. Makowskia laticephala gen. et sp. nov., SNM Z 26506. Photograph of holotype skull (A) and explanatory drawing of the same (B) in ventral view.

Fig. 3. Makowskia laticephala gen. et sp. nov., SNM Z 26506. A. Sclerotic plates in anterior part of right orbit. B. Right stapes.

Fig. 4. Makowskia laticephala gen. et sp. nov., SNM Z 26506. Restoration of skull in dorsal (A) and left lateral (B) views.

Fig. 5. Makowskia laticephala gen. et sp. nov., SNM Z 26506. A. Restoration of skull in ventral view. B. Restoration of lower jaw in right lateral view.

Fig. 6. Makowskia laticephala gen.et sp. nov., SNM Z 26506. A. Anterior portion of postcranial skeleton in dorsal view. B. The same skeleton in ventral view.

Fig. 7. Makowskia laticephala gen. et sp. nov., SNM Z 26506. A. Neural arch from the posterior half of the presacral vertebral column in dorsal view. B. Pleurocentrum and intercentrum from anterior section of caudal vertebral column in posterolateral (B1) and right lateral (B2) views. C. Femur, fibula and anterior section of caudal vertebral column in left lateral view (C1), selected postcranial elements of the same section of vertebral column in right lateral view (C2).