Pyrunculus hoernesi

Pyrunculus hoernesi (Weinkauff, 1866)

Pyrunculus hoernesi @ Croatia by Pero Ugarković

Taxonomic note: Pyrunculus hoernesi was originally described by Weinkauff (1866) as Bulla (Cylichna) hoernesi, reflecting the broad concept of Bulla then applied to many small cephalaspideans. During the following century, the species was generally assigned to the genus Cylichna, appearing in the literature under the combinations Cylichna hoernesi and Cylichna hoernesii. The latter is now regarded as an incorrect subsequent spelling, while the currently accepted name is Pyrunculus hoernesi (Weinkauff, 1866) (MolluscaBase, 2026; WoRMS Editorial Board, 2026). Likewise, Cylichna cuneata Tiberi, 1868 is currently considered a junior synonym of P. hoernesi (Tringali & Oliverio, 2001). The transfer of the species to Pyrunculus resulted from a revised interpretation of retusid systematics based on shell morphology and anatomical characters. Although species of Pyrunculus and Cylichna are superficially similar, they differ in several diagnostic features, particularly shell shape and the structure of the gizzard, which in Pyrunculus bears three subtriangular chitinous plates, each provided with two blunt tubercles (Tringali & Oliverio, 2001). The taxonomy of Mediterranean retusids has long been complicated by their minute size, simple shell morphology and the scarcity of anatomical studies, resulting in frequent misidentifications and nomenclatural inconsistencies. The revision by Tringali and Oliverio (2001) clarified the identity of the Mediterranean representatives of Pyrunculus and established the taxonomic framework currently adopted by MolluscaBase and the World Register of Marine Species (Bouchet et al., 2017; MolluscaBase, 2026).

Synonyms

• Bulla (Cylichna) hoernesi Weinkauff, 1866
• Cylichna cuneata Tiberi, 1868
• Cylichna hoernesii (Weinkauff, 1866)

Description
Pyrunculus hoernesi is a minute bubble snail with a shell reaching approximately 6 mm in length, although most living individuals are smaller (Tringali & Oliverio, 2001). The shell is relatively solid, smooth and glossy, uniformly porcelaneous white and devoid of any colour pattern. It is elongate-pyriform in outline, gradually tapering towards the posterior end, with its greatest width situated near the beginning of the lower third of the shell (Tringali & Oliverio, 2001). The aperture is long and narrow throughout most of its length, becoming slightly broader anteriorly. The columella is nearly straight, with a slight sinuous curvature, while the outer lip is thin and evenly rounded. The apex is deeply sunken within a narrow apical umbilicus and is surrounded by a series of short axial riblets. Fine spiral striae are present on the basal portion of the shell but generally require magnification to be clearly observed (Tringali & Oliverio, 2001). The living animal is delicate and translucent, with the exposed soft parts varying from ivory-white to pale cream and closely matching the shell in colour. The cephalic shield is broad and smooth, with two triangular posterior lobes. The parapodia are small and leave most of the shell exposed, while the eyes are inconspicuous or not readily visible in living specimens (Moro et al., 2009).

Biology
Pyrunculus hoernesi is an infaunal species inhabiting unconsolidated marine sediments, including fine sand, muddy sand and mixed soft bottoms, from the shallow sublittoral to depths exceeding 100 m (Tringali & Oliverio, 2001; Gofas et al., 2011). Living individuals are rarely encountered, and most records are based on specimens recovered through sediment sampling (Tringali & Oliverio, 2001). The diet of P. hoernesi has not been documented, and its feeding preferences remain unknown (Tringali & Oliverio, 2001). Its reproductive biology has not been studied. No information is available on spawning, egg masses, embryonic development, larval stages or reproductive behaviour (Tringali & Oliverio, 2001). Likewise, no studies have described its behaviour or life history under natural conditions.

Etymology

• Pyrunculus, from Greek “pyrus”, pear and “con{unculus}”, diminutive suffix. Small and pear shaped.
• Hoernesi, in honor of the Austrian palaeontologist and mineralogist Dr. Moritz Hörnes (1815-1868), father of the palaeontologist Prof. Dr. Rudolf Hörnes (1850-1912), who published “Die Gasteropoden der Meeresablagerungen der ersten und zweiten Miocanen Mediterran-Stufe in der osterreicheische-ungarischen Monarchie…”.

Distribution
Pyrunculus hoernesi has been recorded from both the western and eastern Mediterranean Sea and the northeastern Atlantic Ocean (Tringali & Oliverio, 2001). In the Atlantic, confirmed records include the Atlantic coasts of the Iberian Peninsula, Madeira, the Canary Islands and Norway (Bouchet, 1975; Moro et al., 2009; Gofas et al., 2011). The species has been reported from shallow sublittoral habitats to depths exceeding 100 m (Tringali & Oliverio, 2001; Gofas et al., 2011).

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Bouchet, P. (1975). Opisthobranches de profondeur de l’océan Atlantique: I – Cephalaspidea. Cahiers de Biologie Marine 16: 317-365.
Bouchet, P., Rocroi, J. P., Hausdorf, B., Kaim, A., Kano, Y., Nützel, A., Parkhaev, P. et al. (2017). Revised classification, nomenclator and typification of gastropod and monoplacophoran families. Malacologia, 61(1-2), 1-526.
Capdevila, M., Folch, J. (2009). Fauna malacològica del Parc Subaquàtic de Tarragona (el Tarragonès, Catalunya, Espanya). SPIRA Vol. 3 Núms. 1-2 Pàg. 33-51.
Cervera, J. L., Calado, G., Gavaia, C., Malaquías, M. A. E., Templado, J., Ballesteros, M., García-Gómez, J. C., Megina, C. (2004). An annotated and updated checklist of the opisthobranchs (Mollusca: Gastropoda) from Spain and Portugal (including islands and archipelagos). Boletín Instituto Español de Oceanografía, 20(1-4), 1-111.
Gofas, S., Moreno, D., Salas, C. (2011). Moluscos marinos de Andalucía. Universidad de Málaga, Servicio de publicaciones e intercambio científico.
Long, S. J. (2006). Bibliography of Opisthobranchia 1554-2000. Bayside Books & Press, Tustin, CA, U.S.A. 672p.
McDonald, G. (2009). Bibliographia Nudibranchia. 2nd Online Edition, Annotated. 1072 pp  Institute of Marine Sciences, University of California, Santa Cruz. Disponible en: http://escholarship.org/uc/item/8115h0wz
Moreno, D., Templado, J. (1998). Nuevas aportaciones al conocimiento de los opistobranquios del sureste español. II. Iberus 16 (2): 39-58.
Moro, L., Ortea, J., Bacallado, J. J., Herrera, R., Espinosa, J., Caballer, M. (2009). Nuevas aportaciones al inventario de las babosas marinas del archipiélago canario (Mollusca: Opisthobranchia y Sacoglossa). Revista de la Academia Canaria de Ciencias, 21(3-4), 109-143.
Ozturk, B., Dogan, A., Bitlis-Bakir, B., Salman, A. (2014). Marine Molluscs of the Turkish Coasts: An Updated Checklist. Tübitak, Turkish Journal of Zoology 38. https://doi.org/10.3906/zoo-1405-78
Peñas, A., Rolán, E., Luque, A., Templado, J., Rubio, F., Moreno, D., Sierra, A. (2006). Moluscos marinos de la zona de la isla de Alborán. Iberus, supplement 6.
Templado, J., Villanueva, R. (2010). Checklist of Phylum Mollusca. pp. 148-198 In Coll, M., et al., 2010. The biodiversity of the Mediterranean Sea: estimates, patterns, and threats. PLoS ONE 5(8):36pp.
Tringali, L. P. (1995). Known range of Pyrunculus hoernesii (Weinkauff, 1866) extended (Gastropoda: Opisthobranchia: Cephalaspidea). Notiz CISMA 17: 3-4.
Tringali, L. P., Oliverio, M. (2001). The recent Mediterranean species of the genus Pyrunculus Pilsbry, 1895 (Opisthobranchia, Cephalaspidea, Retusidae). Bollettino Malacologico 37(5-8):151-162; figs. 1-45.
Weinkauff, H. C. (1866). Nouveau supplément au catalogue des coquilles marines recueillies sur les côtes de l’Algérie. Journal de Conchyliologie 14: 227-248.
WoRMS Editorial Board. (2026). World Register of Marine Species. WoRMS. Disponible en: http://www.marinespecies.org
Bibliography based on the works by Steve Long, 2006. Bibliography of Opisthobranchia 1554-2000 and Gary McDonald, 2009. Bibliographia Nudibranchia, with later updates from other resources.

Further reading

• Biodiversity Heritage Library
• Flickr pictures
• Interim Register of Marine and Nonmarine Genera
• NCBI GenBank
• OBIS - Search by Taxon
• World Register of Marine Species

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