New Australian Taxa

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ISSN: 2200-####

IMPORTANT NOTE:

This is an unpublished draft. Please do not distribute.

Paper Title

BULUNGU WESTERMANI sp. nov.

Holotype—SAM P50840, left M1.

 

Paratypes—SAM P24252, broken left M2 or M3 (cast UCR22136); SAM P24565, left m2 or m3 trigonid (cast UCR22156).

 

Type Locality—Mammelon Hill, RV-8302, Lake Palankarinna, South Australia.

 

Age and Stratigraphy—Mammelon Hill occurs within Faunal Zone D (or Ngama Local Fauna) of the Etadunna Formation,.

 

Etymology—Name in honour of Michael Westerman for his contribution to peramelemorphian systematics.

 

Remarks— SAM P50840 is unique in morphology, and cannot be attributed to any known taxon, and as a result is described here as a new species. SAM P24252 and SAM P24565 are poorly preserved specimens and are tentatively placed in the same taxon as SAM P50840 as they are of an appropriate size.

Species DiagnosisBulungu westermani sp. nov, differs from B. muirheadae as follows: larger in size; no anterior cingulum on M1; preparacrista posterobuccally orientated on M1; stylar cusp B larger than stylar cusp C on M1; no crest connecting stylar cusp B to stylar cusp D on M1; stylar cusp E present on M1.

 

Bulungu westermani sp. nov, differs from B. campbelli as follows: larger in size (see Table 2).

 

Bulungu westermani sp. nov, differs from B. palara as follows: larger in size; no anterior cingulum on M1; metacone directly positioned at the base of the metacone on M1; stylar cusp E present on M1.

 

Bulungu westermani sp. nov, differs from B. minkinaensis as follows: larger in size.

 

Bulungu westermani sp. nov, differs from B. pinpaensis as follows: larger in size.

Description

 

Upper Dentition— The M1 is longer than it is wide. StD is the tallest cusp on the crown, followed by the metacone, StB, StE, metastyle, StD1, StC, paracone, StA, protocone and metaconule. StA is very large and is the most anterobuccal cusp on the crown. It is not connected to any crest. No anterior cingulum is present. StB is conical and is connected to the paracone anterolingually by the preparacrista, and to StC by a posteriorly directed crest, which continues through the ectoflexus to join to the small StD1 and then the almost conical StD. The crest continues through the small StE and ends at the metastyle. The postmetacrista is the longest crest after the stylar crest, followed in order of decreasing length by the preprotocrista, postprotocrista, premetacrista, postparacrista and preparacrista. The postparacrista and premetacrista are connected to form a complete centrocrista. The protocone is lingual to the paracone. The preprotocrista is curved, and ends anterior to the paracone. The postprotocrista is also curved and ends at the minute metaconule, directly anterolingual to the metacone.

 

The M2 or M3 is missing the entire parastylar shelf, and part of StD. The postmetacrista is long as in the M1. The premetacrista connection is unclear. The metaconule is larger than in the M1, and clearly identifiable as a distinct cusp, with a postmetaconulecrista descending its posterior flank and ending directly lingual to the metacone.

 

Lower Dentition— The m2 or m3 trigonid is about as wide as it is long. The paraconid-metaconid distance is shorter than the paracristid but longer than the metacristid. The protoconid is the tallest cuspid on the trigonid, followed by the metaconid and paraconid in decreasing order. A large anterior cingulid is present, parallel to the paracristid.

Figure 6. Bulungu westermani sp. nov., holotype SAM P50840, left M1 (A, occlusal view; B, lingual view); paratype SAM P24252, broken left M2 or M3 (cast UCR22136; C, occlusal view); paratype SAM P24565, left m2 or m3 trigonid (cast UCR22156; D, occlusal view). Scale bar equals 2mm.