Collimys dobosi Hír, 2005
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publication ID |
https://doi.org/ 10.5252/g2010n2a5 |
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persistent identifier |
https://treatment.plazi.org/id/03E18799-FFFA-E923-EC44-FC229BA09064 |
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treatment provided by |
Felipe |
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scientific name |
Collimys dobosi Hír, 2005 |
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MATERIAL EXAMINED. — See Table 13 for measurements.
MORPHOTYPE ANALYSIS
The result of the morphotype analysis of the Collimys molars is given in Table 14.
The explanation of the codes of the morphotypes is primarily given in Hír (2005). A brief summary of this explanation is as below:
M1
A anteromesoloph is long, uninterrupted and reaches the labial margin;
B anteromesoloph is interrupted;
a protocone and paracone are connected by the protolophule I;
b protocone and paracone are connected by the protolophule II;
x protolophule I and II are equally developed;
1 mesoloph reaches the buccal margin;
0 mesoloph is long but does not reach the labial margin;
v metalophule is simple;
W metalophule occasionally bears an extra enamel ridge.
A B
F G H
I I J K L
M2
A lingual anterolophule is completely missing;
B lingual anterolophule is weak;
C lingual anterolophule is well developed;
0 no connection between protocone and paracone;
a protolophule II is well developed, protolophule I is completely missing;
b protolophule II is well developed, protolophule I is incompletely developed;
c protolophule II and I are equally developed;
1 mesoloph reaches the buccal margin;
o mesoloph does not reach the labial margin;
x metalophule is simple;
y metalophule bears an extra enamel ridge.
M3
A protolophule I and II are equally developed;
B only protolophule II is developed;
C only protolophule I is developed;
D protolophule I and II are equally weak or absent;
a anterior and posterior metalophule are equally developed;
b only the posterior metalophule is developed.
m1
A group anterolophulid has 1 branch ore 1 main branch, anteroconid is 1, 2 or 3 parted;
B group anterolophulid is always 2 branched, anteroconid is constantly 2 parted. Th e branches of the anterolophulid are connected to the cusps of the anteroconid;
C group anterolophulid is 2 branched, anteroconid is 2 or 3 parted. Th e labial branch of the anterolophulid is mainly connected to the anterolabial cingulum;
Hír, 2005 from Felsőtárkány 3/10, Hungary. See text for morpho-
D group anterolophulid is always 3 branched, anteroconid is 2 or 3 parted;
0 ectomesolophid is not found;
1 ectomesolophid is developed.
m2
0 antero-lingual cingulum is not developed;
A antero-lingual cingulum is developed;
S mesolophid does not reach the lingual margin;
L mesolophid reaches the lingual margin;
o ectomesolophid is not developed;
x ectomesolophid is developed.
m3
0 antero-lingual is not developed;
A antero-lingual cingulum is developed;
o ectomesolophid is not developed;
X ectomesolophid is developed.
DESCRIPTION
The anterocone of the juvenile M1 consists of two conelets, which are not divided by a notch ( Fig. 7 View FIG A- C). Th e cingulum is developed in the antero-lingual side between the anterocone and the basis of the protocone. In the adult M1 the anterocone is broad and undivided ( Fig. 7A, D View FIG ). The anterolophule of the M1 is short and broad. In M2 and M3 the buccal anteroloph is always well developed. In M2 the lingual anteroloph is less developed but exists in all M2. In M3 the lingual anteroloph is absent or incipient ( Fig. 7J View FIG ).
The anteromesoloph of M1 is highly developed (highly elevated from the level of the sinus) and reaches the buccal margin ( Fig. 7A, C View FIG ). In one specimen it is interrupted (type “B”). The protocone-paracone connection is developed mainly by the protolophule II ( Fig. 7 View FIG B-E). Th ere is a notch between the protocone and the lingual end of the protolophule II in one M1 ( Fig. 7A View FIG ) and in one M2 (2007.99). Only two M1 (type “x”) and two M3 (type “A”) have both protolophules. M1 with protolophule I alone is never found. The mesoloph is highly developed and reaches the buccal margin (type “1”; Fig. 7B View FIG ). In some M1, this ridge ends immediately before the buccal margin (type “0”; Fig. 7C View FIG ). Th e metalophule of the M1 and M2 is short and connected to the posteroloph. It bears a short extra enamel ridge (type “W” in M1 and type “y” in M2; Fig. 7D, E View FIG ). Anterior and posterior metalophules are both developed in the M3.
In the lower dentition, the anteroconid of the m1 is divided. Th e anterolophulid is simple (type “A”) or two branched (types “B” and “C”) ( Fig. 7 View FIG F- I). It is situated between the labial cuspula of the anteroconid and the protoconid. In one specimen the anterolophulid is connected to the metaconid (2007.135; Fig. 7I View FIG ). It is the only morphotype which is not observed in the type sample of C. dobosi from FT 3/2. Th e mesolophid is highly developed (highly elevated from the level of the sinus) and always reaches the lingual margin. Th e ectomesolophid is found in seven m1 (type “1”) ( Fig. 7H View FIG ) and six m2 (type “x”). The antero-lingual cingulum is found in nine m2 ( Fig. 7K View FIG ) and two m3 (type “A”).
COMMENTS
The type sample of Collimys dobosi is from the locality Felsőtárkány 3/2, which is in the same section as Felsőtárkány 3/10 ( Fig. 3 View FIG ; Table 1). The detailed description and morphological analysis of this species was done by Hír (2005). No significant difference is observed, neither in morphology and size between the samples from Felsőtárkány 3/2 and Felsőtárkány 3/10. Collimys dobosi is the dominant species in both faunas. Its frequency is 54.5% in FT 3/2 and 53.5% in FT 3/10 of the rodent remains. Such a high dominance of Collimys is not known beyond the Felsőtárkány Basin.
Recently the Collimys material from Southern Germany was studied by Prieto (2008) and Prieto & Rummel (2009). Th ey proved the presence of Collimys dobosi in the fauna of Hillenloh. They revised and presented the Collimys material of Hammerschmiede, in which Collimys hiri Prieto & Rummel, 2009 is the ancestor of C. dobosi .
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