The Silurian of
Gotland
This page is dedicated to ostracods and other microfossils from the Silurian of Gotland. This Swedish
island preserves an almost complete record of the Silurian with deposits ranging in age from the lower
to upper Silurian (Llandovery to Ludlow). Ostracods are the dominant microfossil but the deposits also
preserve a rare Silurian scolecodont fauna along with the more typical marine groups (brachiopods,
bryozoans, crinoids etc.). Some more exotic groups are known, such as the holothurians.

All of the specimens listed on this page were collected between 1970 and 1984 by the ostracod
researcher Robert Lundin, whose published works include descriptions of the Devonian and Silurian
ostracods of Oklahoma. Each sample has full geological data including the exact locality information.
The map below shows some of the most important localities on Gotland (there are hundreds). This is a
rare chance to get material from a classic Silurian series. Please be aware quantities are limited.
Map showing some of the
Gotland localities
The geological column
of Gotland
Ostracods
Thlipsurella discreta £2/$3
Mulde Marl, Mulde

Excellent, complete
specimen. They remind us
of the scary mask from
'Scream'! Very clean.
Primitiopsis planifrons £2/$3
Mulde Marl and Slite Beds

Excellent, complete specimens
that are very clean. Super
examples of reticulation.
Craspedobolbina clavata
(Female) £5/$8
Mulde Marl, Mulde
Complete specimen with the
brood pouch preserved.
Females are considerably more
rare than the males.
The specimens listed below are just a few of the ostracod species that are found on Gotland. Over 200 species are known
from the island and many can be found in the different microsamples we offer. We have picked out some of the most distinct
forms for those collectors wanting just a few representatives of the fauna.

Many of the images below are SEM scans and show the incredible detail of the specimens. Traditional photography does not
show such detail and the SEMs illustrate the excellent quality of the fossils available.
Clavofabella multidentata £2/$3
Mulde Marl and Slite Beds
Fringe, reticulate surface (unclear in image)
Schweyerina sp. £2/$3
Hogklint and Mulde Marl
Very small species.
Leptobolbina quadriscupidata
(female) £2/$3
Slite Beds
Complete valve with brood pouch
Leptobolbina quadriscupidata
(male) £2/$3
Slite Beds
Complete valve good pustules
Craspedobolbina cuspidulata
£2/$3
Langars - Slite Beds
Complete valve
Craspedobolbina percurrens male
£3/$5
Langars - Slite Beds
Complete valve
Craspedobolbina percurrens
(female) £4/$6
Langars - Slite Beds
Complete valve with brood pouch
Beyrichia hellviensis
£2/$3
Langars - Slite Beds
Complete valve
Mulceodens jaanussoni
Rostroconch - Various Beds
Complete £5/$8
Each measures ~3 to 5 mm.
Nice, clean examples of these
unusual molluscs.
Apatobolbina triscupidata
(female) -
£2/$3
Irevik II -  Upper Visby Beds
Complete valve
Apatobolbina triscuspidata
(male) -
£2/$3
Irevik II -  Upper Visby Beds
Complete valve
Beyrichia halliana
£2/$3
Irevik II - Upper Visby Beds
Complete valve
Healdia sp. - £2/$3
Lower Visby Beds
Complete valve
Tubulibairdia sp. - £2/$3
Various beds
A complete specimen with both
valves fully inflated and articulated.
Silenis sp. - £2/$3
Various beds
Nice examples of a typical smooth
surface ostracod.
Fenestellate Bryozoan - £2/$3 for 6
Hoburgen - Hamra Reef
Excellent quality specimens clearly
showing the appertures and net like
structure. Ideal for classroom. Each
measures ~5 mm.
Astraeospongia Sponge spicules
Hoburgen II - Hamra Reef Beds
Very good quality specimens. Ideal
for classroom study as they show
distinct spicule morphology.
Eocaudina sp.
Hoburgen II
Hamra Reef Beds

Rare, tiny, near complete and
partial ossicles from a holothurian.
Sollasina sp. - SOLD OUT
Hoburgen IIb - Hamra Reef Beds

Rare near complete ophiocistioid gonoid plate. The
first examples we have ever seen. Distinct and
unusual specimens from this echinoid-like animal
Ulrichella sp.? - £3/$5
Snoder - Hemse Beds
A distinct valve with elongation of the
anterior and posterior margins.
Cornulites sp. - $2/$3
Lau Backar - Eke Beds

Excellent quality worm tubes, often
showing attachment to another
object. Nice specimens.
Branch bryozoans - £2/$3 for 6
Lau Backar - Eke Beds
Excellent quality specimens
clearly showing the apertures.
Ideal for classroom study. Each
measures ~10 mm.
For a selection of
Gotland
Scolecodonts
please click here
Paraprimitia sp.? - £2/$3
Upper Visby Beds
Valve with small, well defined spine.
Paraschmidtella sp. - £2/$3
Langars - Slite Beds
Complete specimen with both
valves still articulated.
Leiocyamus apicatus - £2/$3
Various Beds
A complete specimen with the
small anterior frill still intact.
Aechmina cuspidata - £5/$8
Lower Visby and Slite Beds
Complete valve
Craspibolbina variolata - £2/$3
Svarvare - Slite Beds
A complete specimen with the
outer fringe still intact.
Other Microfossils
Beyrichia snoderiana £2/$3
Mulde Marl and Hemse Beds
Complete valves.
Craspedobolbina percurrens
£2/$3 Mulde Marl, Hemse Beds
Good quality complete valves
Craspibolbina unculifera - £2/$3
Irevik II - Lower Visby Beds
Male and females available
Amphisella sp. - £2/$3
Hoburgen IIa - Hamra Beds
A complete, reticulate valve
Hemsiella sp. - £5/$8
Hoburgen IIa - Hamra Beds
Rare ostracod!
Juviella juvensis - £2/$3
Hoburgen IIa - Hamra Beds
Complete, but partially encrusted.
Loisellites sp. - £2/$3
Hoburgen IIa - Hamra Beds
A complete valve
Burselella sp. - £5/$8
Rare!
Acanthoscapha sp. - £3/$5
Lau Backar - Eke Beds
Rare! Complete valve
Arcyzonidae - £3/$5
Lau Backar - Eke Beds
Rare, ornate valve
Rozhdestvenskayites sp. - £3/$5
Lau Backar - Eke Beds
Complete valve
Garniella lineolata. - £2/$3
Lau Backar - Eke Beds
Complete valve minor encrustation
Beyrichia globifera - £3/$5
Lau Backar - Eke Beds
Female with brood pouch
Clintiella sp. - £3/$5
Lau Backar - Eke Beds
Rare valve with brood pouch
Leperditia - £2/$3
Lau Backar - Eke Beds
Complete valve
Auloporids - £2/$3 for 6
Lau Backar - Eke Beds

Excellent quality coral buds.
Great for study as some show
branching and multiple polyps
Apatobolbina simplicidorsata - £2/$3
Nyhamn II - Lower Visby Beds
Male and female available
Leptobolbina hypnodes -  £2/$3
Nyhamn II - Lower Visby Beds
Complete valve with fringe
Cryptophyllus sp. - £2/$3
Nyhamn II - Lower Visby Beds
Unusual ostracod valve
Quasilites sp.? £2/$3
Nyhamn II - Lower Visby Beds
Complete valve with spine
Encrusting bryozoans
£
2/$3 for 6
Various Beds
Excellent quality specimens
showing the apertures and
other characteristic bryozoan
features.
Atractosella Sponge spicules
Eke and Hamra Reef Beds
Good quality fused specimens
showing distinct spicule
morphology.
Bryozoans and Corals
Worms
Sponges and Holothurians
Echinoderms
Rostroconchs
Miscellaneous & Mystery Fossils
Aptilechinus caledonicus
£2/$3
A rare collection of plates and
spines from this rare Silurian
echinoid. The plates show the
distinct porous mesh with wide
pores on one side and thin on
the other.
Bythocyrpis sp. £2/$3
Kvarnberget - Slite Marl g
Complete valve
Kirbyella sp. £2/$3
Kvarnberget - Slite Marl g
Complete valve
Longiscula sp. £2/$3
Nyhamn II - Lower Visby Beds
Complete valve
Paraparchites sp. £2/$3
Hoburgen II - Hamra Beds
Complete valve
Jagatiella sp. £2/$3
Kvarnberget - Slite Marl g
Complete valve
Cadmea sp. £2/$3
Kvarnberget - Slite Marl g
Complete valve
Neoprimitiella sp. £2/$3
Nyhamn II - Lower Visby Beds
Tiny complete valve
Parahippa sp. £5/$8
Lau Backar - Eke Beds
Rare valve
Altha sp. £2/$3
Slite Marl
Complete valve
Tentaculitids
Cornulites gotlandicus - $3/$5
Eskelham - Slite Beds

A rare complete specimen of
this spiney cornulitid.
Dicricoconus clintianus
£2/$3
Eskelham - Slite Beds
Turmalites slitensis
£2/$3
Eskelham - Slite Beds
Seretites sp. - £2/$3
Eskelham - Slite Beds
Gotland Ostracod Collection
2 Display trays - £100/$160

This collection consists of 72 individually labelled
capsules housed in two display trays with lid (shown
left). The fossils are primarily ostracods, with a couple
of species of tentaculitids and worms. The specimens
are a great overview of the ostracod fauna with a wide
variety of forms being included. All ostracod and worm
specimens are complete and indentied. The
tentaculitids are like those shown below.
Primitiopsis sp. - £2/$3
Eke Beds
Complete valve
Neobeyrichia sp. £3/$5
Gothemshammer 1 - Halla Beds
Complete valve
Gotlandella martinnsoni £2/$3
Klintebys - Mulde Beds
Complete valve
Craspedobolbina sinnarvensis
£2/$3
Klintebys - Mulde Beds
Craspedobolbina impersonalis
£3/$5 (rare!)
Gothemshammer 1 - Halla Beds
Bollia sp. £2/$3
Gothemshammer 1 - Halla Beds
Complete valve
Bolbiprimitia sp. £2/$3
Gothemshammer 1 - Halla Beds
Complete valve
Craspedobolbina subordinata
Male - £2/$3
Gothemshammer 1 - Halla Beds
Craspedobolbina subordinata
Female - £2/$3
Gothemshammer 1 - Halla Beds
Panderodus sp. - £2/$3
Nyhamn I - Visby Beds
Rare examples of Silurian
conodonts. These are the first
specimens from this time
period that we have had.
Podolites ternatus - £2/$3
Gothemshammer I
Halla Beds
Well preserved specimens showing the rings and annulets
To purchase ostracod rich matrix from Gotland please follow this link
Atractosella cataractaca
£2/$3 for 6
Visby Beds
These unusual fossils are the
spicules of soft octacorals. The only
specimens we have ever had.
Annuliconchus siluricus -
£2/$3 (pair)
Rare Microconchids

Tiny coiled tubes of this unusual
group reminiscent of serpulid
worms.
Mystery spine? £1/$2
Nyhamn II - Lower Visby

We have no idea what these
spines are from. Does anyone
have any suggestions?
The two main types are
shown in the image.
Mystery egg cases? £6/$10
Nyhamn II - Lower Visby
Something we have never seen before but look like egg
cases. The specimens for sale do not typically have the
basal attachment. We found only one with a base and it
was sent for SEM imaging.
Vertebrates & Conodonts
Thelodont Scales - £2/$3
Gothemshammer - Halla Beds
Silurian fish scales. Tiny
examples of the only vertebrate
evidence so far discovered in
much of Gotland.
Craspedobolbina clavata
(Male) £3/$5
Mulde Marl, Mulde
Excellent, complete specimen
often with both valves still
articulated. Typical specimens
measure ~3mm long.
We no longer sell the above sponge spicules as individual items, but we can provide the matrix in which they are found so
that you can pick them yourself. Price is £3/$5 per sample.
Triemilomatella prisca  £2/$3
Dapps - Upper Mulde Marl
Distinct species
Beyrichia dactyloscopica £2/$3
Dapps - Upper Mulde Marl
Complete valve.
Mystery plate £1/$2
Ygne - upper Visby
An unusual armour? plate that
has wide flat top and a long thin
attachment spine. Suggestions?