Protadelomys cf. alsaticus, Hartenberger, 1969
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publication ID |
https://doi.org/10.1186/s13358-022-00245-3 |
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persistent identifier |
https://treatment.plazi.org/id/497F1B1D-FF89-DF00-C739-40F2FE93F99F |
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treatment provided by |
Felipe |
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scientific name |
Protadelomys cf. alsaticus |
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? Protadelomys cf. alsaticus morphotype 2
Material and measurements. (cf. Additional file 4: S4; Table 4B) We refer six M1–M2, two M3, one dp4, three p4, one m1, one m3 to this morphotype.
Description
Upper teeth
M1. ( Fig. 39a, b, c View Fig ). Te smaller M1 of the assemblage (BUX 67–78; Fig. 39a View Fig ) has a relatively simple occlusal pattern, without wrinkles of the enamel on the outskirts of the crown, only very small and tiny roughnesses. Te parastyle is weakly swollen. Te main cusps and conules, as well as the anterostyle and posteroconule, are bulbous. Te metacone bears a premetacrista. Te mesostyle is strong and placed a little more buccally than the paracone and metacone. Te paraconule prolongs mesially in a short thick ridge; it is a little smaller than the metaconule, which is bulbous and strong. Te mesoloph reaches the center of the mesoflexus but its lingual part is discontinuous and low. Te protoloph is strong only in its buccal part; its lingual part is very low and slender, and connects with the center of the protocone. Te buccal part of the metalophule II is strong; it ends lingually in a distomesial spur, which could represent a vestigial metalophule I. Te lingual metalophule is as weak as the very low distal connection between the metalophule II and the metaconule, and the low distal connection between the metaconule and the center of the hypocone. Te other M1 (BUX 67–48: Fig. 39c View Fig , BUX67-49: Fig. 39b View Fig , BUX67-63: Fig. 39d View Fig = M1 or M2; BUX67-78: Fig. 39a View Fig ) are small but display the same occlusal pattern, with some variations in the mesoloph length (shorter in BUX 67–48) and in its lingual connection: to the metaconule mesial spur (BUX67-48, 49), or free (BUX 67–63). Te parastyle is more swollen on BUX 67–48 and 49.
M2 ( Fig. 39d, e View Fig ). Te M2 show the same features as the M1, but the connection between the mesoloph and the buccal ridge of the metaconule is stronger on BUX 67–26, which also shows a stronger distal spur on the paraconule. Te mesoloph is short and ends free in the mesoflexus on BUX 67–41. BUX 67–26 shows a short ectocingulum on the distal flank of the mesostyle. BUX 67–41 has both postparacrista and premetacrista while BUX 67–26 has only the premetacrista, like on the M1.
M3. BUX 67–87: Fig. 39f View Fig , and 88: Fig. 39g View Fig , are small, their occlusal outline is almost circular in shape with rare extra-ridges and small conules. Te metaconid is weakly protrudring from the bucco-distal cingulum.
LoWer teeth dp4. ( Fig. 39h View Fig ). BUX 67–95 is much smaller than the other dp4. Despite an important mesial wear, it is possible to distinguish a mesial junction between the metaconid and the protoconid (anterolophid), closely followed distally by the metalophulid I. Te mesiodistal ridge is incomplete and low. Te postprotocristid makes a short low lingual spur at its distal extremity. Te mesoconid is barely marked on the short mesiodistal ectolophid. Te latter lowers at the level of its junction with both the prehypocristid and the buccal end of the entolophid. Te hypoconulid is slightly protruding above the prehypocristid and posterolophid. Tere is no distinct extra-ridge or granule, and the enamel is smooth.
p4. ( Fig. 39i, j, k View Fig ). Te three p4 are shorter than but almost as wide as those of? Protadelomys alsaticus . Te extra-ridges are absent, apart from a short mesiodistal ridge, which connects to the metaconid (BUX 67–98 and BW 56-54bis) or to the protoconid (BUX 67–106). Te latter and BUX 67–98 show a small mesial notch (not visible for BW 56-54bis); it is limited linguo-mesially by a short cingulid on BUX 67–106.
molars. On the smallest lower molars previously referred to as P. alsaticus , no peculiar morphological characters can justify an attribution to P. cf. alsaticus morphotype 2. However, we tentatively refer two teeth to this morphotype: one m1 (BSK-A27: Fig. 39l View Fig ) and one m3 (BUX 68–37: Fig. 39m View Fig ).), which are clearly narrower than the other m3.
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