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Swiss Journal of Palaeontology

Table 1 Morphological features of specimens of different species of Chieseiceras. Multipliers indicate observations on quarter whorls

From: Chieseiceras dolomiticum n. sp. (Ammonoidea) and its significance for the calibration of the Triassic platform interior stratigraphy at Latemar (Southern Alps, Italy)

Specimen

(A)

Diameter (cm) at location of measurements

(B)

Umbilical width (%)

(C)

Umbilical nodes per

half whorl

(D)

Marginal nodes per

half whorl

Ratio

(d/c)

Ch. dolomiticum

(PIMUZ 25701, Fig. 3/1)

holotype, Latemar

2.6

38

9

18

2.0

Ch. dolomiticum

(PIMUZ 36535, Fig. 3/2)

Latemar

2.9

33

8.5

20

2.4

Ch. dolomiticum

(PIMUZ 36537, Fig. 3/4)

Latemar

2.35

32

9

20.5

2.3

Ch. dolomiticum

(PIMUZ 36538, Fig. 3/5)

Latemar

2.3

35

8

17.5

2.2

Ch. dolomiticum

(PIMUZ 36534, Fig. 3/7)

Bagolino

4.4

36

10−

21

2.1

Ch. chiesense

(B&R 1986, pl.1/Fig. 7)

Bagolino

4.3

32.5

2 × 6

12

2 × 15

30

2.5

Ch. chiesense

(B&R 1986, pl.1/Fig. 1)

Bagolino

~ 3.5

31.5

2 × 4.5

9

2 × 11

22

2.4

Ch. perticaense

holotype Pèrtica Bassa

(B&R 1986, pl.3/Fig. 1+4)

~ 5.0

–

15

31

2.1

Ch. perticaense

(B&R 1986, pl.3/Fig. 3)

Pèrtica Bassa

2.9

31

11

25

2.3

Ch. pemphix

(Mojsisovics 1982, pl.39/Fig. 9)

San Salvatore

3.7

40

8

20

2.5

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