Microchlamylla gracilis

Microchlamylla gracilis  (Alder & Hancock, 1844)

Microchlamylla gracilis @ Netherlands 24-03-2017 by Stefan Verheyen










































Microchlamylla gracilis  (Alder & Hancock, 1844)

 Classification according to Bouchet et al. (2017)
Taxonomic source: World Register of Marine Species (AphiaID: 1048134).

Taxonomic note: The classification of the Flabellinidae had remained fairly stable until in 2017 a series of works appeared (Furfaro et al., 2017; Korshunova et al., 2017) that intended to clarify the status of the Flabellinidae family. The main objective of the paper by Furfaro et al. was to molecularly characterize the Mediterranean species while the paper by Korshunova et al. wanted to delve into the phylogenetic relationships between various members of the Flabellinidae family and the other families of aeolidaceans.
Both works were based on the combination of molecular and morphological techniques and, in fact, do not offer very different results, but differ on the size and origin of the studied samples and, mainly, on the interpretation of the results. After the appearance of the paper by Furfaro et al., many Mediterranean species of the genera Calmella, Flabellina and Piseinotecus were grouped under the common genusFlabellina, but had certain problems with some species that did not fit well with the proposed classification (e.g,Flabellina babai) , discovered that the Mediterranean and Atlantic populations ofFlabellina ischitana correspond to two different cryptic species, and noted the problems of the cryptic group formed by Calmella cavolini / Flabellina confusa / Piseinotecus gaditanus, indicating the need for further studies to clarify their status.
Curiously, these studies were being carried out practically in parallel by the group of Korshunova et al. but on a much wider sample of species that included specimens from the Arctic, North Atlantic, Pacific and Indian Oceans. This second paper confirms the polyphily of the family Flabellinidae, but the interpretation of these results becomes a real revolution for the taxonomy of the aeolidaceans, especially for the family Flabellinidae.
Both papers show that there are two well differentiated clades (groups) in the Flabellinidae: species like Coryphella pedata and similars, with cerata that come directly from the back, and species like Flabellina affinis and similars, with cerata of each group coming from a stalk or pod. Although Furfaro et al. consider the species of both clades belonging to the genusFlabellina within the family Flabellinidae, Korshunova et al. distinguishes two families: Coryphellidae and Flabellinidae sensu stricto, also creating many different genera in these families to include the species they study. Its taxonomic proposal, curiously, solves the problems found by Furfaro et al.
In a way, both papers complement to each other, although in the paper by Korshunova et al. it is evident the lack of studies on tropical flabellinid species and those from southern America and Africa, so the subject has not been settled. The proposal to create new genera to collect small groups of species, instead of multispecific genera, seems to be the trend in some of the phylogenetic works of recent years. We hope to see new papers expanding the knowledge on the aeolidaceans soon. A detailed discussion of this exciting controversy can be found at (https://opistobranquis.info/en/flabellinidae/).


  • Coryphella gracilis (Alder & Hancock, 1844)
  • Coryphella rufibranchialis var. clavigera Odhner, 1929
  • Eolis gracilis Alder & Hancock, 1844 (original)
  • Eolis smaragdina Alder & Hancock, 1851
  • Flabellina gracilis (Alder & Hancock, 1844)




  • Microchlamylla. After “micro” and “chlamylla“; in reference to the unusually long vas deferens
    of this genus typical for the genus Chlamylla of the family Paracoryphellidae, but
    smaller body size and discontinuous notal edge, common in the family Coryphellidae.
  • Gracilis. From Latin “gracilis”, thin, tiny.


Known georeferenced records of the species: Microchlamylla gracilis
: GROC 2010-2011
: Enric Madrenas
: João Pedro Silva
: Bernard Picton
: Manuel Ballesteros.
: M@re Nostrum
: Altres fonts
: Marine Regions

References for the species: Microchlamylla gracilis

    Cantabria: Hidalgo (1916, as Coryphella).

    General: Bergh, 1875:635; Brown & Picton, 1979:19; Colgan, 1914:186; Dekker, 1989:101; Eliot, 1906c:359; Farran, 1909:7; Garstang, 1890:440; Hayward, Wigham, & Yonow, 1990:724; Hoffmann, 1926:20; Kuzirian, 1979:241; Lemche, 1936:138; 1938:26; Nordsieck, 1972:73; Picton, 1978:88; Picton & Morrow, 1994:94[P]; Pruvot-Fol, 1954b:424; Roginskaya, 1987d:189; Swennen, 1987:40; Thompson, 1988:250; Thompson & Brown, 1984:109[P] as Coryphella gracilis

    Sources: Cervera et al., 2004, Ballesteros, 2007 & 2016, McDonald, 2006 and other sources.


    Western Mediterranean:0 out of 5 stars
    Eastern Mediterranean:0 out of 5 stars
    Atlantic Ocean:0 out of 5 stars

This chart displays the monthly observation probability for Microchlamylla gracilis based on our own records.

More pictures


    Abbott, R. T. 1974. American seashells. The marine mollusca of the Atlantic and Pacific coast of North America. Van Nostrand, New York. 663 pp., 24 pls. [October 1974].
    Adams, A. A., and H. Adams. 1853. The genera of recent Mollusca, arranged according to their organization. London (van Voorst): pp.1-256, pls 1-32, 1853; 257-484, pls 33-60, 1854 (1); 1-92, pls 61-72, 1854; 93-284, pls 73-96, 1855; 285-412, pls 97-112, 1856; 413-540, pls 113-128, 1857; 541-661, pls 129-138, 1858 (2). vol 2; pp 45-78 Oct.-Nov. 1854; pp 97-99 Jan 1855; p 632-635 Nov 1858; pls. 62-68, 137, fig. 14; pl 138, fig. 1.
    Aerts, L. A. M. 1994. Seasonal distribution of nudibranchs in the southern delta area, S W. Netherlands. J. Molluscan Stud. 60(2):129-139.
    Alder, J. 1848. Catalogue of the Mollusca of Northumberland and Durham. Transactions of the Tyneside Naturalists’ Field Club 1:97-209, 358-365.
    Alder, J. 1869. Account of the British Nudibranchiata. Jeffrey’s British Conchology 5:18-94.
    Alder, J., and A. Hancock. 1843. Notice on a British species of Calliopaea d’Orbigny and on four new species of Eolis with observations on the development and structure of the nudibranchiate mollusca. Annals and Magazine of Natural History 12: 233-236.
    Alder, J., and A. Hancock. 1854. A monograph of the British nudibranchiate Mollusca: with figures of all the species. Ray Society, London.
    Alder, J., and A. Hancock. 1844. Description d’un genre nouveau de mollusques nudibranches, et de quelques especes nouvelles d’eolides. Annales des Sciences Naturelles, Paris, series 3, 1:190-191.
    Alder, J., and A. Hancock. 1844. Description of a new genus of nudibranchiate Mollusca, with some new species of Eolis. Annals and Magazine of Natural History 13: 161-167 [novembre].
    Alder, J., and A. Hancock. 1845. Report on the British nudibranchiate Mollusca. Report 14th Meeting of the British Association for the Advancement of Science; pp 24-29.
    Alder, J., and A. Hancock. 1847. A monograph of the British nudibranchiate Mollusca: with figures of all the species. Ray Society, London. Ray Society, London.
    Alder, J., and A. Hancock. 1855. A monograph of the British nudibranchiate Mollusca: with figures of all the species. Ray Society, London.
    Anderson, J. 1999. Flabellina gracilis accessed through: Scottish Nudibranchs on 2014-12-21. (http://www.nudibranch.org/Scottish Nudibranchs/flabellina-gracilis.html).
    Ballesteros, M., E. Madrenas, and M. Pontes. 2021. OPK - Opistobranquis. (https://opistobranquis.info/).
    Beaumont, W. I. 1900. Part II.–The benthos (dredging and shore collecting). VII.–Report on the results of dredging and shore- collecting; pp 754-798, In: The fauna and flora of Valencia Harbour on the west coast of Ireland. Proceedings of the Royal Irish Academy, series 3, 5(3):667-854.
    Beaumont, W. I. 1900. XII–Report on the opisthobranchiate Mollusca; pp 832-854, In: The fauna and flora of Valencia Harbour on the west coast of Ireland. Proceedings of the Royal Irish Academy, series 3, 5(3):667-854.
    Bergh, L. S. R. 1885. Beitrage zur Kenntniss der Aeolidiaden. VIII. Verhandlungen der koniglich-kaiserlich Zoologisch- botanischen Gesellschaft in Wien (Abhandlungen) 35(1):1-60, pls. 1- 7.
    Bergh, L. S. R. 1875. Beitrage zur Kenntniss der Aeolidiaden. III. Verhandlungen der koniglich-kaiserlich Zoologisch-botanischen Gesellschaft in Wien (Abhandlungen) 25:633-658, pls. 13-15.
    Bergh, L. S. R. 1878. Malacologische Untersuchungen, In: Reisen im Archipel der Philippinen von Dr Carl Gottfried Semper. Zweiter Theil. Wissenschaftliche Resultate. Band 2, Theil 2, Heft 14; pp 603-645, I-L, pls. 66-68.
    Bergh, L. S. R. 1887. VIII. Die Nudibranchien Gesammelt warhrend der fahrten des “Willem-Barents” in das nördliche Eismeer. Bijdragen tot de Dierkunde afleverung, Amsterdam. Onderzoekingstochter van  de “Willem-Barents” Exped. Gedeelte 13(4):1-37, pls. 1-3.
    Bergh, L. S. R. 1908. Malacologische Untersuchungen, In: Reisen im Archipel der Philippinen von Dr Carl Gottfried Semper. Zweiter Theil. Wissenschaftliche Resultate. Band 9, Theil 6, Heft 3; pp 119-181, pls. 9-12.
    Bergh, L. S. R. 1890. Die cladohepatischen Nudibranchien. Zoologische Jahrbucher, Abtheilung fur Systematik Geographie und Biologie der Thiere 5:1-75.
    Bergh, R. 1892. System der Nudibranchiaten Gasteropoden. Malacologische Untersuchungen. In: Reisen im Archipel der Philippinen von Dr. Carl Gottfried Semper. Zweiter Theil#Wissenschaftliche Resultate. Band 7, Theil 5. [pp. 1–51, pls 1–4, Mar. 1897; pp. 53–115, pls 5–8, Dec. 1897; pp. 117–158, pls 9–12, Nov. 1898; pp. 159–208, pls 13–16, 27 Mar. 1900; pp. 209–256, pls 17–20, 29 Jan. 1901; pp. 257–312, pls. 21–24, 15 Oct. 1901; pp. 313–382, pls 25–29, 7 Oct. 1902].
    Brown, G. H., and B. E. Picton. 1979. Nudibranchs of the British Isles — a colour guide. Underwater Conservation Society, Manchester, by R. Earll.
    Cella, K., L. Carmona, I. Ekimova, A. Chichvarkhin, D. Schepetov, and T. M. Gosliner. 2016. A Radical Solution: The Phylogeny of the Nudibranch Family Fionidae. PLoS ONE 12/2016; 11(12):e0167800.
    Cervera, J. L., J. Templado, J. C. García-Gómez, M. Ballesteros, J. Ortea, F. J. García, J. Ros, and A. A. Luque. 1988. Catálogo actualizado y comentado de los Opistobranquios (Mollusca, Gastropoda) de la Península Ibérica, Baleares y Canarias, con algunas referencias a Ceuta y la isla de Alborán. Iberus, supl. 1: 1-84.
    Cervera, J. L., G. Calado, C. Gavaia, M. A. E. Malaquías, J. Templado, M. Ballesteros, J. C. García-Gómez, and C. Megina. 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. L.
    de Montaudouin, X., and P.-G. Sauriau. 2000. Contribution to a synopsis of marine species  richness in the Perthuis Charentais Sea with new insights in soft-bottom macrofauna of the Marennes- Oléron Bay. Cahiers de Biologie Marine 41(2):181-222.
    Debelius, H., and R. H. Kuiter. 2007. Nudibranchs of the world. IKAN- Unterwasserarchiv, Frankfurt.
    Edmunds, M. 1991. Does warning coloration occur in nudibranchs. Malacologia 32(2):241-255.
    Eliot, C. N. E. 1910. A monograph of the British nudibranchiate Mollusca: with figures of the species; Figures by the late Joshua Alder and the late Albany Hancock, and others. Ray Society, London.
    Evertsen, J., and T. Bakken. 2013. Diversity of Norwegian sea slugs (Nudibranchia): new species to Norwegian coastal waters and new data on distribution of rare species. Fauna Norvegica 32: 45-52.
    Evertsen, J., and T. Bakken. 2005. Nudibranch diversity (Heterobranchia, Gastropoda) along the coast of Norway. Fauna Norvegica, 25: 1-37.
    Farran, G. P. 1915. Results of a biological survey of Blacksod Bay, Co. Mayo. Department of Agriculture & Technical Instruction for Ireland Fisheries Branch. Dublin. Scientific Investigations, 1914, (III):1-72, pl I.
    Farran, G. P. 1909. Nudibranchiate Mollusca of the trawling grounds of east and south Coasts of Ireland. Department of Agriculture & Technical Instruction for Ireland Fisheries Branch. Dublin. Scientific Investigations, 1907, (6):1-18.
    Fernández-Ovies, C. L. 1981. Contribución a la clasificación morfológica de las puestas de los opistobranquios (Mollusca: Gastropoda). Boletín de Ciencias de la Naturaleza del Instituto de Estudios Asturianos 28: 3-12.
    Flanders Marine Institute. 2018. Maritime Boundaries Geodatabase: Territorial Seas. Maritime Boundaries Geodatabase. (http://www.marineregions.org/).
    Forbes, E., and S. C. T. Hanley. 1850. A history of the British Mollusca, and their shells, vol III. Including the families of Gasteropoda from Neritidae to Elysiadae, x + 616 pp, pls. 80-120, 114A-114D, EE, GG, HH, JJ-LL, OO-PP, RR-VV,.
    Furfaro, G., D. Salvi, E. Mancini, and P. Mariottini. 2017. A multilocus view on Mediterranean aeolid nudibranchs (Mollusca): Systematics and cryptic diversity of Flabellinidae and Piseinotecidae. Molecular Phylogenetics and Evolution 118: 13–22.
    Garcia, F. J., and H. Bertsch. 2009. Diversity and distribution of the Gastropoda Opisthobranchia from the Atlantic Ocean: A global biogeographic approach. Scientia Marina. 73: 153–160.
    Garstang, W. 1890. A complete list of the opisthobranchiate Mollusca found at Plymouth; with further observations on their morphology, colours, and natural history. J. Mar. Biol. Assoc. U.K., new series, 1:399- 457, pls. 27-28.
    Gosse, P. H. 1856. A manual of marine zoology for the British Isles, vol 2, 239 pp. London.
    Hayward, P. J., G. D. Wigham, and N. Yonow. 1990. Mollusca I: Polyplacophora, Scaphopoda, and Gastropoda; pp. 628-730, In: , The marine fauna of the British Isles and north-west Europe, volume 2, xvi + 996 pp. Oxford University Press.
    Hidalgo, J. C. 1916. Datos para la fauna española (Moluscos y Braquiópodos). Boletín de la Real Sociedad Española de Historia Natural 16: 235-246.
    Hoffmann, H. 1926. I. Opisthobranchia, In: Die Tierwelt der Nord- und Ostsee, Lieferung III, Teil IX; pp 1- 52. Akademische Verlagsgesellschaft, Leipzig.
    Høisæter, T. 1986. An annotated check-list of marine molluscs of the Norwegian coast and adjacent waters. Sarsia 71(2):73-175.
    Jeffreys, J. G. 1862. British Conchology. London, van Voorst : Vol. 1: pp. CXIV + 341 [1862]. Vol. 2: pp. 479 [1864] Il frontrespizio reca la data 1863 ma in effetti pubblicato nel 1864. Vol. 3: pp. 394 [1865]. Vol. 4: pp. 487 [1867]. Vol. 5: pp. 259 [1869]. J. Van Voorst.
    Just, H., and M. Edmuns. 1985. North atlantic nudibranchs (Mollusca) seen by Henning Lemche. Ophelia supplement 2: 1-150.
    Knight, C. 1867. Natural history or second division of “The English cyclopædia,”, vol. 4, 1292 pp. Bradbury, Evans, & Co., London.
    Korshunova, T. A., A. V. Martynov, T. Bakken, J. Evertsen, K. Fletcher, I. W. Mundiata, H. Saito, K. Lundin, M. Schrödl, and B. Picton. 2017. Polyphyly of the traditional family Flabellinidae affects a major group of Nudibranchia: aeolidacean taxonomic reassessment with descriptions of several new families, genera, and species (Mollusca, Gastropoda). ZooKeys 717: 1-139.

    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

Cite this article as:

Ballesteros, Manuel, Enric Madrenas, Miquel Pontes (2021) "Microchlamylla gracilis" in OPK-Opistobranquis. Published: 15/10/2014. Accessed: 27/01/2021. Available at (https://opistobranquis.info/en/Ba6Nu)

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