Photo of the day (91): spoons made of Turbo marmoratus

I have taken these photos of spoons and cutlery in a shop in Hội An, Central Vietnam.spoons made of shellsspoons made of shellsThese spoons are made of some gastropod shells, most probably of green turban Turbo marmoratus. With the shell length up to 20 cm (or up to 25 cm) it is the largest species of the family Turbinidae. It’s distribution is Indo-Pacific. As of 1974 it has been listed as a “common” species. The shell is commercially important as a source of nacre (mother of pearl) and it is the most important commercial species of Turbinidae in the tropical Indo-West Pacific. It is intensively harvested and exploited in some countries. Many of its populations has been reduced.


Dance S. P. (ed.) (1974). The Encyclopedia of Shells. Blanford Press, ISBN 0713706988, pages 52-53.

Dwiono S.A.P., Pradina & Makatipu P.C. (2001) Dwiono, S., & Pradina, M. P. (2001). Spawning and seed production of the green snail (Turbo marmoratus L.) in Indonesia. SPC Trochus Information Bulletin# 7. Poka–Ambon, Indonesia, 7.

Turbo marmoratus Linnaeus, 1758. accessed August 15, 2019.


Photo of the day (90): Lymnaea stagnalis

Lymnaea stagnalis is a species of a common holarctic freshwater snail from the family Lymnaeidae. It usually inhabits standing waters and also temporary pools. What will happen to Lymnaea stagnalis snails when is the temporary pool out of water?

This is a temporary pool in the southern part of the Litovelské Pomoraví Protected Landscape Area, Czech Republic at June 29, 2018.Lymnaea stagnalisFortunately Lymnaea stagnalis can survive outside water for some time. Most of them were still alive.

Lymnaea stagnalisThere are also some Stagnicola turricula snails (those smaller ones) among Lymnaea stagnalis. It is also species from the family Lymnaeidae.Lymnaea stagnalis and Stagnicola turriculaReferences


Photo of the day (89): Babylonia areolata

Babylonia areolata is a species of a sea snail from the Indo-Pacific. It is a predatory species.

It can be found on sandy bottom from Taiwan to Ceylon. It lived also in Japan in Late Miocene (about 11 to 5 million years ago) and in Pliocene (about 5 to 2.5 million years ago). My photos of Babylonia areolata are from southern Vietnam.Babylonia areolataThere is also visible on the previous photo, that the siphon is not a tube, but it is a part of the mantle rolled into a shape of a tube.

The shape of its shell is buccinoid. So it was classified in the family Buccinidae with the superfamily Buccinoidea in the 20th century. The family Babyloniidae was established in 1971 but it has became more widely used since 2005. The family Babyloniidae has been classified within the superfamily Muricoidea since 2005. The family Babyloniidae is unassigned to a certain superfamily as of 2019. Although the higher taxonomy is unclear and (nearly) always changing, its generic placement is quite stable and this species belong to the genus Babylonia since 1838.

A view of a live Babylonia areolata showing the shape of the shell:Babylonia areolataBabylonia areolata is commercially important species. It is also produced in aquaculture. It is an edible snail and it is a part of cuisine of Vietnam, Thailand and China and probably in other countries as well. It is sold in markets in Vietnam sometimes.

They are being stored in markets in bowls with sea water like this. Number of live Babylonia areolata in a bowl of water:Babylonia areolataThe color of the shell is yellow and it has three rows of brown spots. It is very easy distinguishing feature, because Babylonia areolata is the only Babylonia of 14 Babylonia species that has three rows of spots. The color of a live animal is yellow.

A brown operculum is attached at dorsal part of the foot in a live snail. The shape of the operculum is drop-like. There are are clear growth lines on the operculum.

Or you can see them in markets on plates without water. Live Babylonia areolata on sold in a street in Gò Vấp District, Ho Chi Minh City. Babylonia areolata is on the bottom right. There are also other water snails; freshwater Pila ampullacea, and other sea snails, bivalves and crustaceans:Babylonia areolataThe growth lines on the operculum are much more clear on the photo:Babylonia areolataMenu with ten different dishes made of Babylonia areolata in a street restaurant in Gò Vấp District, Ho Chi Minh City. You can get a dish for about 70.000 Vietnamese đồng there:Babylonia areolata menuVietnamese food with Babylonia areolata, lemon grass and red pepper in a soup from Cần Giờ District, Ho Chi Minh City:Babylonia areolataReferences

Altena C. O. van Regteren & Gittenberger E. (1981). “The genus Babylonia (Prosobranchia: Buccinidae)“. Zoologische Verhandelingen 188: 1-57, + 11 plates.

MolluscaBase (2019). MolluscaBase. Babylonia areolata (Link, 1807). Accessed through: World Register of Marine Species at: on 2019-07-21

Photo of the day (88): snails at Sebaldus shrine

The shrine of St. Sebaldus is supported by sculptures of snails. That is a nice work from the Renaissance.

St. Sebaldus is a patron saint of Nuremberg (in Bavaria, Germany). The bronze shrine of St. Sebaldus is in the middle of the St. Sebaldus Church in Nuremberg. It was made by German sculptor Peter Vischer the Elder (1455-1529) and his sons in 1508-1519.

There are 12 different snail sculptures holding the shrine. They all represent stylommatophoran land snails with right-handed shell. You can see four of them here:

Snail sculpture at Sebaldus shrine

Snail sculpture at Sebaldus shrine. Photo by Rodrigo B. Salvador, CC-BY-4.0.

Snail sculpture at Sebaldus shrine

Snail sculpture at Sebaldus shrine. Photo by Rodrigo B. Salvador, CC-BY-4.0.

Snail sculpture at Sebaldus shrine

Snail sculpture at Sebaldus shrine. Photo by Rodrigo B. Salvador, CC-BY-4.0.

Snail sculpture at Sebaldus shrine

Snail sculpture at Sebaldus shrine. Photo by Rodrigo B. Salvador, CC-BY-4.0.

I cloud not found much information about these snail sculptures so it remains a mystery, at least for me. But I think that they were made for aesthetic purposes only, because snail shells are beautiful and shells would seem incomplete without live gastropods. I also try to present live gastropods on this blog instead of shells only.

You can see similar blog post about the same shrine at “(52) Nürnberg St. Sebald“, as well as other old sculptures of snails. And the whole blog “Hunting for snails ~ snails in art” is worth to read.

A short note about snails in the church is on “Reliquarian” blog post at “Winter of Discontent: Saint Sebaldus, Protector Against Cold Weather, Takes a Sabbatical“.


(in German) Sebaldusgrab. St. Sebald, Nürnberg. accessed 2019, February 12.

Photo of the day (87): Megalobulimus

This is the snail shell container that is used by shamans of Yanomami South American Indians for keeping hallucinogenic yopo. The container was made from the shell of a land snail from the genus Megalobulimus (family Strophocheilidae).
MegalobulimusIt is on display in the Náprstek Museum of Asian, African and American Cultures in Prague. It is a part of the temporary exhibition Indians in 2017-2019 as the previous post.

It was made by Yanomami tribe and it was collected in Brazil in 1989. Yanomami belong to a big group of South American tropical forest cultures. Their religion is shamanism. Various hallucinogenic stuff helps to shamans to communicate with the realms of supernatural powers.

Yopo sniffing powder can be prepared like this. Only shamans should do this because it is causing intoxication. Take seeds of Anadenanthera peregrina tree. Roast them on a clay pot. Crush them into powder. You can add some lime or lime fired from crushed shells. Add some water. Made a paste. Form a small cakes from the paste. Dry the paste on a pot by the fire. When the paste is solid, mill it into a powder.

The whole set looks like this:MegalobulimusA snail shell container is used for storing the yopo “cakes”. It is made of the shell, a wood and of burned bee’s wax:
MegalobulimusWooden plate or a friction bowl is used to crush the yopo into a very fine powder. Yopo is inhalated from the plate too:
Wooden plateA hair brush is used to manipulate with the powder. A hair brush was made from anteater hairs and of burned bee’s wax. A stem is made of bones, of wood and of burned bee’s wax. It is used for sniffing the yopo powder:
a stem made of bonesA woven box is used to store all of those things.

For example there is very similar set depicted from Puerto Ayacucho in Venezuela on the figure 1. Puerto Ayacucho is about 500-600 km far away from the area where where Yanomami tribe exist.

Grossmann (1957) wrote, that Guahibo Indians produce yopo while adding calcium of snail shells to make yopo effective.  Nieves-Rivera et al. (1995) wrote, that Taino Indians from Caribbean added crushed shells to the yopo powder. The powder was made from big marine shells probably of true conchs Lobatus gigas, Lobatus costatus and Strombus pugilis. Altschul (1972) specified that Otomac culture from the area of Orinoco obtained the lime “… by firing the shells of large snails which the Indians eat and which they collect on river flood-banks.” That makes sense, because no matter how will you add calcium. Either from lime, from marine shells or from non-marine snail shells.

The Megalobulimus species could be Megalobulimus oblongus (Müller, 1774), but it is hard to be sure.
MegalobulimusAnother view of the container and the shell:

Altschul, S. R. (1972). The genus Anadenanthera in Amerindian cultures. Mass., Harvard University.

Fish, M. S., & Horning, E. C. (1956). Studies on hallucinogenic snuffs. Journal of Nervous and Mental Disease, 124(1), 33-37.

Grossmann, E. N. (1957). Herbs in Folk Medicine. Western Folklore, 16(4), 290-292.

Nieves-Rivera, A. M., Muñoz-Vázquez, J., & Betancourt-López, C. (1995). Hallucinogens used by Taíno Indians in the West Indies. Atenea, 15(3), 125-141.

Photo of the day (86): Scyllaea pelagica

Scyllaea pelagica is a species of a nudibranch.

When I saw this sea slug for the first time, it resembled a floating rag to me. A very small floating rag. It is even waving in the water and it will bent easily in the smallest water current.

Scyllaea pelagicaScyllaea pelagicaI suppose that such appearance gives to a slug an advantage against predators. The brown coloration gives a resemblance to surroundings between the Sargassum brown algae. Its waving is a cryptic behaviour. Those are two ways of a camouflage.

Its constant movement and bending in every unobvious angles is a challenge for taking photos of this sea slug.

Its body length can reach up to 45 mm. My specimen comes from southern Croatia. The whole distribution of this species is large, because it can be found in all tropical and temperate seas. It is the only species from the family Scyllaeidae in Mediterranean Sea.

Let’s taken a closer look in a clearer position. Right side view of the Scyllaea pelagica heading right:
Scyllaea pelagicaLeft side view of the Scyllaea pelagica heading left:
Scyllaea pelagicaIts rhinophores are very small and they are hidden in rhinophore sheaths. Its head with mouth and with rhinophore sheaths looks like this from underside:
Scyllaea pelagicaThere are two pairs of lobes on its dorsal part of the body. Underside view:
Scyllaea pelagicaThere are also visible dendritic gills on the dorsal part and between lobes. Gills are transparent or white in color.
Scyllaea pelagicaThere is a genital pore on the right side of the body. It lies in front of the first pair of lobes. There is also anus on the right side of the body. It lies between those lobes.
Scyllaea pelagicaThere are also beautiful blue spots on the sides and on the dorsal part of the body.

Where are eyes? I found no eyes in my photos. I am also not sure what exactly are orange like structures inside the body of the slug.


Rudman, W.B., 2004 (March 10) Scyllaea pelagica Linnaeus, 1758. [In] Sea Slug Forum. Australian Museum, Sydney.

Cataneo-Vietti R., Chemello R. & Giannuzzi-Savelli R. (eds.) 1991 Atlas of Mediterranean nudibranchs. Atlante dei Nudibranchi del Mediterraneo. La Conchiglia, Roma, page 22 (only mention its occurrence and nothing more).

Photo of the day (85): dress with cowries

This is a Native American woman’s dress with cowrie shells.

The dress is on display in the Náprstek Museum of Asian, African and American Cultures in Prague. It is a part of the temporary exhibition Indians in 2017-2019.

dress with cowrie shellsIt is a woman’s dress made of cotton. The bodice is decorated with six lines of cowrie shells (family Cypraeidae). They are probably shells of money cowrie Monetaria moneta, that is the most common cowrie.

dress with cowrie shellsThe dress is from the first half of the 20th century. It comes from the Western Plains Indians. According to the Museum staff is was made by Crows or by Cheyennes. Shells comes from the Indo-Pacific tropical waters and therefore they were imported to the Great Plains.

There is also a belt made of hide and of cloth. There were used porcupine quills in the embroidery of the belt:
dress with cowrie shellsSuch cowries decorations were used also by other Native American tribes, including for example Sioux. Decorating by Crows with elk teeth looks very similar. Elk teeth were probably used in times when cowries were not available yet.

The same style of the dress is shown for example on this 1904 photo:

Cheyenne baby in dress with cowrie shells

1904 photo of Cheyenne baby by American photographer Jessie Tarbox Beals (1870-1942). Public domain. It comes from the website of Missouri Historical Society.

It depicts the Cheyenne baby. There are only four rows of cowrie shells. It seems that there are money cowrie Monetaria moneta shells too, but there are also some ring cowrie Monetaria annulus shells on the right sleeve and on the right part of the dress (on the left part on the photo).



Photo of the day (84): Recluzia lutea

Recluzia lutea (Bennett, 1840), synonym: Recluzia rollandiana Petit de la Saussaye, 1853, is a species of a marine pelagic snail. This means that this snail does not live on the sea bottom, but it lives in the water column. Surprisingly this snail has no swimming fins. This species does not live in the whole water column, but in its the most upper part, closer to the surface level. Therefore it is a part of neuston and such gastropods are called neustonic gastropods. Simply said: Recluzia lutea float on the sea surface. There is also the term ‘plankton’ used for these gastropods: that means it is only able to drift and it cannot swim against the water current. This species is holoplanktonic, which means that it is planktonic for its entire life. It live under a raft-like float made from air bubbles and mucus. It has not yet been observed how the float is constructed by Recluzia.

Recluzia lutea

Shells of Recluzia lutea. Photo by Rodrigo B. Salvador, CC-BY-4.0.

These shells of Recluzia lutea were found way up in the Matinhos River, Paraná state, in southern Brazil, after a storm event, and sent to the Zoology museum in São Paulo.


Beu A. G. 2017: Evolution of Janthina and Recluzia (Mollusca: Gastropoda: Epitoniidae). Records of the Australian Museum, 69(3): 119–222. DOI: 10.3853/j.2201-4349.69.2017.1666

S. van der Spoel, L.J. Newman & K.W. Estep (accessed December 13, 2018) Recluzia rollandiana. Marine Species Identification Portal.

Photo of the day (83): Pleurodonte isabella

Pleurodonte isabella (Férussac, 1822) is a neotropical land snail from the family Pleurodontidae. It is also known as “Pleurodonte sp. Barbados” among snail pet keepers. It is variable in color: it can be brown, yellow, orange, blue or purple.

Pleurodonte isabellaIt is endemic to Barbados. It is widespread and abundant there. It inhabits natural environment as well as disturbed habitats. There is wet season and dry season in Barbados. Temperature ranges from 21 to 31 °C. But snails keepers recommend to keep this species in temperature 22-24 °C and in humidity 70-80 %.

It is herbivorous species. It is nuisance occasionally when it eats gingers Zingiber sp. and heliconias Heliconia sp. flowers. It was also reported as a pest on Citrus.

Various right side views:
Pleurodonte isabellaPleurodonte isabellaPleurodonte isabellaI also tested, if Pleurodonte isabella eat Canna indica ‘Auguste Ferrier’. It is cultivated variety with reddish leaves. This flower occurs in the same areas as Pleurodonte isabella, but it has molluscicidal activity. Various extracts of Canna indica kills freshwater molluscs, because it is nerve agent to them. I found that, that Pleurodonte isabella avoid eating this plant in terrarium. So it seems that they are clever enough to not poison itself.

The width of the shell of this specimen is 18 mm, the height of the shell is 13 mm.

Umbilical view:
Pleurodonte isabellaI did not identify this species by myself. I was able to get some information about ecology of Pleurodonte isabella, but I failed to get information about proper identification of the species. I am glad that an expert in Neotropical malacolofauna helped me in identification/verification.


Ciomperlik M. A. , Robinson D. G., Gibbs I. H. , Fields A., Stevens T. & Taylor B. M. (2013). Mortality to the Giant African Snail, Lissachatina fulica (Gastropoda: Achatinidae), and Non-Target Snails using Select Molluscicides. Florida Entomologist, 96(2): 370-379. DOI: 10.1653/024.096.0257.

Pollard G. V. & Alleyne E. H. (1986). Insect pests as constraints to the production of fruits in the Caribbean. In: Pests and Diseases as Constraints in the Production and Marketing of Fruits in the Caribbean. IICA, 31-61. page 43.

Tripathi, S. M., & Singh, D. K. (2000). Molluscicidal activity of Punica granatum bark and Canna indica root. Brazilian Journal of Medical and Biological Research, 33(11): 1351-1355. DOI: 10.1590/S0100-879X2000001100014.

Tripathi, S. M., Singh, V. K., Singh, S., & Singh, D. K. (2004). Enzyme inhibition by the molluscicidal agent Punica granatum Linn. bark and Canna indica Linn. root. Phytotherapy Research, 18(7), 501-506. DOI: 10.1002/ptr.1168. Accessed December 8, 2018. Accessed December 8, 2018.

Photo of the day (82): Palaeotachea

These are photos of a shell of a snail from the genus Palaeotachea from the Early or Middle Miocene of the Pfaffenhofen district in Bavaria, Germany. I thank my friend and paleomalacologist Rodrigo B. Salvador who has kindly shared the following photos. Paleomalacologist is a biologist who study prehistoric molluscs.

The genus Palaeotachea belongs to the subfamily Helicinae, within the well known family Helicidae. All species of the genus Palaeotachea lived in the Early or in the Middle Miocene and all of them are extinct now. There are recognized at least 11 species within the genus. It was hypothetized that Palaeotachea species lived in habitats varying from from scrublands to humid woods. In the middle of the Middle Miocene something happened and all Palaeotachea species died out. Instead of them other species from the other genus – Megalotachea sylvestrina also from the family Helicidae – started to thrive.

This certain shell is possibly Palaeotachea silvana. That means it is an interesting species worth to know for everybody who is interested in Tertiary of Europe.


Apertural view of Palaeotachea. Photo by Rodrigo B. Salvador, CC-BY-4.0.


Apertural view of Palaeotachea. It is the previous image rotated to the main position. Photo by Rodrigo B. Salvador, CC-BY-4.0.

When will you rotate the image into the main or standard position like this, you can much more easily measure the width and the height of the shell. The width of this shell is about 21 mm.


Apical view of Palaeotachea. Photo by Rodrigo B. Salvador, CC-BY-4.0.


Apical view of Palaeotachea. It is just rotated the previous image. Photo by Rodrigo B. Salvador, CC-BY-4.0.

So what’s interesting in Palaeotachea silvana?

Palaeotachea silvana (Klein, 1853) is an extinct species, that has lived in Middle Miocene.

The specific name silvana is an adjective of the Latin word silva, that means forest or wood. Unfortunately I do not know why the author has chosen this specific name. It was described by physician of the German army (Generalstabsarzt, it is a second highest military rank for physicians in the army) and naturalist Adolf von Klein (1805–1891 or 1892) from Kingdom of Württemberg (now Baden-Württemberg in southwest Germany). The description was published in local journal Jahreshefte des Vereins für vaterländische Naturkunde in Württemberg that could be translated as Yearbook of the Association for Natural History in Württemberg. He described this species under the name Helix silvana in 1853. Later other names were used for this species: Cepaea silvana (Klein, 1853) and Megalotachea silvana (Klein, 1853). These names are considered as synonyms.

Helix crepidostoma Sandberger, 1872 is the type species of the genus Palaeotachea. But the Palaeotachea silvana can be considered as the most important species of the genus. Palaeotachea silvana is an index fossil. Index fossil is a species that is a common and widely distributed in a certain relatively short period. Palaeotachea silvana is an index fossil of Silvana Beds. It is also spelled Silvana-beds, and Silvanaschichten or Silvanakalk in German language. Silvana Beds got its name directly after this species. Palaeotachea silvana is most commonly found fossil in Silvana Beds. Silvana Beds’ range is from 15.8 to 13.8 myr (millions years ago). This means that range of Silvana Beds approximately correspond to older part of the Middle Miocene. Palaeotachea silvana is known at least from the following countries: Hungary, Austria, Baden-Württemberg in Germany and Bavaria in Germany.

The width is some shells of Palaeotachea silvana usually reach about 22 mm, but unusually big shells may have shell width up to 28 mm. There are sometimes visible by naked eye or under the UV light two or three bands on shells of Palaeotachea silvana, but this specimen has no bands. The shell has 4 – 4½ whorls. For other details about shell description see both works Salvador et al. 2015.

The mean annual temperature in the Central Europe in the Middle Miocene was about 19 °C. Yes, it was really hot those days.

References (sorted chronologically, newest first)

Höltke, O.; Salvador, R. B.; Rasser, M. W. 2018. Miocene continental gastropods from the southern margin of the Swabian Alb (Baden-Württemberg, SW Germany). Neues Jahrbuch fur Geologie und Palaontologie, Abhandlungen 287(1): 17–44. DOI: 10.1127/njgpa/2018/0704.

Salvador, R. B.; Höltke, O.; Rasser, M. W. 2018. Miocene continental gastropods from Dischingen, Germany. Palaeodiversity 11(1): 11–19. DOI: 10.18476/pale.11.a2.

Salvador, R. B.; Tütken, T.; Tomotani, B. M.; Berthold, C.; Rasser, M. W. 2018. Paleoecological and isotopic analysis of fossil continental mollusks of Sandelzhausen (Miocene, Germany). Paläontologische Zeitschrift 92(3): 395–409. DOI: 10.1007/s12542-017-0400-6.

Salvador, R. B. & Rasser, M. W. 2017. Fossil terrestrial and freshwater Gastropoda from the Early/Middle Miocene of Heuchlingen, Germany. Archiv für Molluskenkunde 146(2): 233–241. DOI: 10.1127/arch.moll/146/233-241.

Salvador, R. B.; Höltke, O.; Rasser, M. W. 2017. Fossil land and freshwater gastropods from the Miocene of Hohenmemmingen, Germany. Palaeodiversity 10: 41–48. DOI: 10.18476/pale.v10.a4.

Höltke, O.; Salvador, R. B.; Rasser, M. W. 2016. Paleobiogeography of Early/Middle Miocene terrestrial gastropods in Central Europe: an approach using similarity indices. Palaeogeography, Palaeoclimatology, Palaeoecology 461: 224–236. DOI: 10.1016/j.palaeo.2016.08.027.

Salvador, R. B. & Rasser, M. W. 2016. Fossil land and freshwater gastropods from the Middle Miocene of Bechingen and Daugendorf, southwestern Germany. Archiv für Molluskenkunde 145(1): 111–124. DOI: 10.1127/arch.moll/1869-0963/145/111-124.

Salvador, R. B. & Rasser, M. W. 2016. The fossil land and freshwater snails of Oggenhausen (Middle Miocene, Germany). Revista Brasileira de Paleontologia 19(1): 41–52. DOI: 10.4072/rbp.2016.1.04.

Salvador, R. B.; Höltke, O.; Rasser, M. W.; Kadolsky, D. 2016. Annotated type catalogue of the continental fossil gastropods in the Staatliches Museum für Naturkunde Stuttgart, Germany. Palaeodiversity 9: 15–70. DOI: 10.18476/pale.v9.a3.

Salvador, R. B.; Pippèrr, M.; Reichenbacher, B.; Rasser, M. W. 2016. Early Miocene continental gastropods from new localities of the Molasse Basin in southern Germany. Paläontologische Zeitschrift 90(3): 469–491. DOI: 10.1007/s12542-016-0291-y.

Salvador, R. B.; Prieto, J.; Mayr, C.; Rasser, M. W. 2016. New gastropod assemblages from the Early/Middle Miocene of Riedensheim and Adelschlag-Fasanerie, southern Germany. Neues Jahrbuch fur Geologie und Palaontologie, Abhandlungen 279(2): 127–154. DOI: 10.1127/njgpa/2016/0546.

Salvador, R. B.; Rasser, M. W.; Höltke, O. 2015. Fossil gastropods from Miocene Lake Randeck Maar and its hinterland (SW Germany). Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, 277(3): 251–273. DOI: 10.1127/njgpa/2015/0505.

Salvador, R. B.; Sach, V. J.; Valentas-romera, B. L. 2015. The fossil continental mollusks in the Upper Freshwater Molasse (Middle Miocene) of the districts of Biberach, Ravensburg and Neu-Ulm, Germany. Revista Brasileira de Paleontologia 18(2): 201–216. DOI: 10.4072/rbp.2015.2.02.

Klein A. v. 1853. Conchylien der Süßwasserkalkformation Württembergs. – Jahreshefte des Vereins für vaterländische Naturkunde in Württemberg, 9: 203–223. Plate 5, figure 2.