Collections H.M. Bolli:

Back to overview to the collections H.M. Bolli

Reference material to Bolli, H.M. (1970): The Foraminifera of Sites 23-31, Leg 4. Init. Rep. DSDP, vol. 4, pp. 577-643.

Standort

A box containing 16 SEM stubs with planktic foraminifera, partly coated with gold, partly uncoated. The arrangement of stubs is as follows:

a=1	b	c	d	e	f	g
h	i	k	screw	l	m=2	n=3
o	p	q

Stub # a=1: Bolli (1970), Plate 7, page 639.

Stub # m=2: Bolli (1970), Plate 1, page 627.

Stub # n=3: Bolli (1970), Plates 5 and 6, pp. 635 and 637.

Stub # g: Bolli (1970), Plate 7, page 639.

Stub # f: Bolli (1970), Plate 9, page 643.

 

Unfortunately, the individual stubs are not labelled by themselves, and there is no drawing nor identification lists with species names to any of these 16 stubs. Some of these stubs are coated, others are not or hold coated and uncoated specimens on them.

 

 

Notice about missing/destroyed type specimens to Globorotalia hessi Bolli and Premoli Silva (1973):

Globorotalia hessi was first informally described and illustrated by SEM study by Hans Bolli in 1970 as Globorotalia crassaformis B from DSDP Leg 4, sample 29-1-3, 10-12cm (Init. Rep. DSDP, page 633, see Plate 4, figs 13-16). Later, in 1973, form B was re-described by Bolli & Premoli Silva and raised to new species G. hessi n.sp. (Init. Rep. DSDP 15, pp. 475 ff.).

 

In the above box with SEM stubs, some of the coated stubs bear some other specimens illustrated in Bolli (1970). However, on none of the 16 SEM stubs the specimen can be unequivocally recognized that Bolli (1970) illustrated as G. crassaformis B on Plate 4, fig. 15, and that in Bolli & Premoli Silva (1973) was raised to the holotype (C-27611), but see comments below.

 

The specimen from Figure 16 on plate 4 in Bolli (1970) is very similar to a specimen mounted on stub "g" (see above scheme), but identity is not given to 100%. The specimen illustrated on Figure 14 on plate 4 of Bolli (1970) is almost certainly identical to a specimen also mounted on stub "g".

 

Mounted in between these two illustrated specimens of G. crassaformis on stub "g" is a destroyed specimen, that cannot be identified to species any more. The fragments show however, that the original specimen was mounted in side view. From the remains of the final chamber it cannot be excluded, that this was the holotype specimen illustrated as G. crassaformis B in Figure 15 of Bolli (1970), i.e. the later named as G. crassaformis hessi Bolli and Premoli Silva (1973).

 

From the above observations it is therefore reason to believe, that the holotype to G. crassaformis hessi Bolli & Premoli Silva (1973), deposited in the reference collection to Bolli (1970), is destroyed.

 

In the adjoining study collection of Hans Bolli from Leg 4 there is a single Plummer cell prepared by Bolli with various Neogene planktics from the type locality and type level (DSDP Leg 4, Hole 29-1-3, 10-12cm), from where G. hessi n.sp. was described. In field no. 31 this slide holds three specimens of G. hessi (G. crassaformis B) det. Bolli, that look very close (though not identical) to the specimens illustrated in Bolli (1970) on plate 4, figs 13-16.

 

The mentioned slide is currently kept in the study collection to H.M. Bolli, DSDP Leg 4, in K3/A15/1/14, on wooden tray No. 78, Plummer slide "Planktonics site 29", including a hand written species identification list by Bolli.

 

MK, 24 August 2018, updated 26 June 2020.