Miostrellus cf. petersbuchensis ROSINA et RUMMEL, 2012

Rosina, Valentina V. & Rummel, Michael, 2019, The Early Miocene Bats (Chiroptera, Mammalia) From The Karstic Sites Of Erkertshofen And Petersbuch 2 (Southern Germany), Fossil Imprint 75 (3 - 4), pp. 412-437 : 431-432

Miostrellus cf. petersbuchensis ROSINA et RUMMEL, 2012

Text-fig. 8j, l, m

M a t e r i a l a n d m e a s u r e m e n t s. Petersbuch 2: PCMRCh5, left m1, 1.50 × 0.85 × 0.95; PCMRCh6, right mnd with m1, 1.40 × 0.90 × 0.95; PCMRCh7, left p4, 0.75 × 0.70; PCMRCh87, right m3, 1.20 × 0.70 × 0.65; BSP 1979 XXII 5365, left M1, 1.35 × 1.60; BSP 1979 XXII a, left M1, 1.35 × 1.65; BSP 1979 XXII 5367, left M3, 0.90 × 1.70; BSP 1980 XXII 4805, left P4, 0.95 × 0.90.

D e s c r i p t i o n a n d c o m p a r i s o n. The M1 from Petersbuch 2 (specimens BSP 1979 XXII 5365 and BSP 1979 XXII a) have neither paraloph nor paraconule. The weak metaloph merges with the postprotocrista and disappears at the base of the metacone and thus, the trigon basin is closed. The hypocone is almost absent. The M3 crown from Petersbuch 2 (specimen BSP 1979 XXII 5367) is somewhat compressed in the anteroposterior direction, the metacone is reduced, the paraloph is weak and the paraconule is absent. The Р4 crown (specimen BSP 1980 XXII 4805) is also compressed in the anteroposterior direction, its lingual talon is moderately developed and the anterolingual cuspid is absent. The upper molars from Petersbuch 2 are distinguished from those of Myotis in having of a well-developed cingulum, a compact crown of upper molars and a lack of conules and hypocones. Morphologically they are most similar to Miostrellus petersbuchensis and also in size ( Tab. 8).

The p4 crown from Petersbuch 2 (specimen PCMRCh7) is triangular in occlusal view and has well-developed anterolingual and posterolingual cuspules ( Text-fig. 8l ). It differs from M. noctuloides from Sansan and Petersbuch 6 (compare with specimens NMA P6-01045, NMA P10- 00591; Ziegler 2003: 462, fig. 3(2)) in being larger ( Tab. 8). Morphologically and also in size the p4 from Petersbuch 2 is most similar to that of M. petersbuchensis ( Tab. 8).

The m1 paralophids from Petersbuch 2 (specimens PCMRCh5, PCMRCh6) are somewhat curved while the trigonids of the crowns are very wide ( Text-fig. 8j, m ) which differentiate these teeth from those of Myotis . Nevertheless, the m1 paralophids are significantly less curved than those of Plecotus . These morphological traits of the crowns, together with their myotodonty, supports their possibly connection to either Eptesicus or Miostrellus . The m3 crown from Petersbuch 2 (specimen PCMRCh87) differs from that of Myotis in having a somewhat reduced talonid, an elongated and curved paralophid and a narrow trigonid. The lower molars are smaller than those of E. aurelianensis but larger than M. risgoviensis and M. noctuloides ( Tab. 8). Therefore they morphologically correspond well with M. petersbuchensis ( Rosina and Rummel 2012: 471, fig. 5E, F).

Figures

Text-fig. 8. a, o – Miostrellus petersbuchensis, Petersbuch 28: a – NMA P28/0335, right maxillary bone with P4–M3, holotype, ventral view; o – NMA P28/0449, right mnd with C inf., p4–m3, occlusal view; b–f, k, n – M. cf. noctuloides: b – BSP 1962 XIX 4198, right M3, Erkertshofen 1, occlusal view; c – BSP 1962 XIX 4195, left M1, Erkertshofen 1, occlusal view; d – PCMRCh4, left C sup., Petersbuch 2, lingual (d1) and occlusal (d2) views; e – BSP 1974 XIV 1204, left C sup., Erkertshofen 2, occlusal (e1) and lingual (e2) views; f – PCMRCh23, right P4, Petersbuch 2, occlusal view; k – BSP 1974 XIV 1200, right C inf., Erkertshofen 2, occlusal view; n – BSP 1962 XIX 4192, right mnd with m1–2; Erkertshofen 1, lateral (n1) and occlusal (n2) views; g – Eptesicus cf. aurelianensis, BSP 1962 XIX 4197, right M2, Erkertshofen 1, occlusal view; h, i – cf. Miostrellus sp., Erkertshofen 2: h – BSP 1974 XIV 1203, left m1, occlusal view; i – BSP 1974 XIV 1207, right P4; j, l, m – Miostrellus cf. petersbuchensis, Petersbuch 2, occlusal views: j – PCMRCh5, left m1; l – PCMRCh7, left p4; m – PCMRCh6, right mnd with m1.