Cerion bonairensis H.B. Baker, 1924

Original Description

Cerion uva bonairensis, new subspecies

Type locality: (B5) Porta Spaño, Bonaire.

Distribution: Bonaire; everywhere on limestone (B1 to B9), and in the richer habitats on the older rocks (Bb3, 7, 9). Klein-Bonaire: everywhere (K1). 343 adults collected.

In this subspecies (Plate XXI), as in arubanum, the palatal wall of the peristome projects out markedly from the preced­ing whorls. However, the aperture is usually broader, instead of twisted tangentially, so that the umbilicus is smaller, and more like that of the typical subspecies. Also, C. uva bonair­ensis (Table XIV) has high whorls similar to knipensis, and the cleaned surface of the shell resembles dead-white enamel while that of the other species is chalky-white or porcellanous. As in the subspecies from Curaçao, the Bonaire lots vary in size with the richness of the locality. Typical bonairensis (fig. xxi-F6) includes the larger shells of the series, while the smaller lots may be called form kralendijki, new (fig. xxi-A2), with the recent limestone just south of Kralendijk (Bl) as the type locality; Although the cerions of Bonaire invade the central regions of older rocks to a considerable extent, the form desculptum appears to be quite absent.

Table XIV. Mean and Extreme Dimensions of Cerion uva arubanum

and bonairensis

Comparison of Stations

Place

Nos.

Whorls

Altitude

Index

Maj. Diam.

A2c

200

11.9(11.0-13.5)

21.6(18.7-25.9)

44(37-51)

9.4 (8.3-10.3)

A5a

122

12.2(11.0-14.0)

22.5 (20.0-27.4)

43 (36-50)

9.6 (8.7-10.8)

Totals,

Aruba

322

12.0(11.0-14.0)

22.0(18.7-27.4)

43(36-51)

9.5(8.3-10.8)

Bb3

12

11.7 (11.0-12.5)

24.1 (22.2-25.8)

43(40-48) 10.3(9.9-10.7)

B5

39

11.5 (10.5-12.5)

22.2 (19.6-26.8)

44(39-53) 10.3(8.9-11.0)

B8

58

11.3 (10.5-12.5)

21.8(19.7-24.4)

45(38-49)

9.9 (9.0-10.8)

B7

51

11.5(10.5-12.0)

22.4(19.6-25.4)

44(39-50)

9.8 (9.0-10.9)

Bb7

20

11.5 (10.5-13.0)

22.3(19.7-25.4)

44(39-50)

9.7(9.0-10.2)

B4

17

11.4(10.5-12.5)

21.9 (19.2-24.1)

44(37-51) 9.7(8.4-10.3)

K1

28

11.2 ( 9.5-12.0)

21.2 (16.0-24.2)

46(41-61)

9.7 (8.9-10.7)

B3

44

10.9 ( 9.5-12.0)

21.0(17.1-23.1)

47(41-55)

9.7(8.9-10.5)

B6

6

10.8(10.5-11.5)

19.7(19.2-20.2)

49(47-51)

9.6(9.1-10.1)

B9, Bb9

28

11.1 (10.0-12.0)

20.4 (18.2-23.9)

45(38-53)

9.1(8.2-10.2)

B1

31

10.9 (10.0-11.5)

20.0(17.8-21.2)

46(41-52)

9.1(8.4- 9.6)

B2

9

10.7 (10.0-12.0)

19.7(17.2-23.1)

47(42-51)

9.1 (8.4-10.1)

Totals,.

Bonaire

343

11.2 ( 9.5-13.0)

21.6 (16.0-26.8)

45(37-61)

9.7 (8.2-11.0)

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