Prkic,Tisselli &GlUNCHI Novapex 8 (3-4): 103-1 10, 10 décembre 2007 On the discovery ofSemipallium coruscans coruscans (Hinds, 1845) (Bivalvia: Pectinidae) in the Adriatic Sea ' Jakov PRKIC Getaldiceva 1 1, 21000 Split, Croatia [email protected] Morena TISSELLI & Luigi GlUNCHI Via Novara 19, San Zaccaria -48100 Ravenna, Italy [email protected] KEYWORDS. Bivalvia, Pectinidae, Semipallium coruscans coruscans, Manupecten pesfelis, Adriatic Sea. ABSTRACT. The report ofSemipallium coruscans coruscans (Hinds, 1845) from the Adriatic Sea is the subject of discussion. Some juvénile pectinid species collected in association with Corallium rubrum (Linné, 1758) were studied and one ofthe authors (J. P.) noticed thatjuvénile spécimens ofManupecten pesfelis (Linné, 1758) show great similarity with S. coruscans coruscans (Hinds, 1845) reported from the Adriatic Sea. Subsequently we decided to make a broader study ofthèse two species and at the end ofour study we can confirm that the report of Semipallium coruscans coruscans from the Adriatic Sea is a misidentification of Manupecten pesfelis. We noticed that Semipallium coruscans coruscans was transferred to the genus Pascahinnites Dijkstra & Raines, 1999. INTRODUCTION SYSTEMATICS The work of Siletic (2004) about the discovery of a Family PECTINIDAE Wilkes, 1810 CHLAMYDINAE single spécimen ofSemipallium coruscans coruscans Subfamily von Teppner, 1922 (Hinds, 1845) from Mljet Island, Croatia came to the GenusManupecten Monterosato, 1889 knowledge ofthe first author and he noticed that this Manupectenpesfelis (Linné, 1758) spécimen is very similar to some spécimens from his GenusSemipallium Jousseaume in Lamy, 1928 collection already identifiée! as juvénile spécimens of Semipallium coruscans coruscans (Hinds, 1845) Manupecten pesfelis (Linné, 1758). To confirm his supposition we tried to find some other spécimens and Distribution of the two species. The distribution of met with success. In some shell grit collected by Manupecten pesfelis was reported by Linné (1758) fishermen on red coral, offMljet Island at depths from from "O. Africano" (incorrect locality) as stated by 60 to 90 m, we found many pectinid spécimens, some Dijkstra (1999) who gives a new restricted locality: of which were M. pesfelis at différent stages of "Mediterranean Sea". It was also reported by Wagner growth. (1991) as: 'The species is confined to the Moreover, Siletic confirmed her first report in a Mediterranean and the adjacent area of the Atlantic second work (Siletic, 2006) where she specified that Océan from Portugal to the Azores and south to Cape the spécimen was collected at depth of 80 m, on a Verde" and about habitat he wrote: "On gravelly or colony of Ce/lariafistulosa (Linné, 1758) a Bryozoa corallinous bottoms from 10 to 250 m". Some years less calcified than red coral. after Dijkstra & Goud (2002) reported: After examination ofthe spécimens from Mljet Island "Mediterranean Sea and adjacent région of eastern we compared them with some spécimens of S. Atlantic from Portugal southwards to the Cape Verde coruscans coruscans from Raiatea Island, French Islands. Living littorally to bathyal depths among Polynesia, and so far as possible we compared shells coral rubble or gravel on sandy bottoms. Présent ofa similarsize. material dead in 0-540 m". Recently Raines & Poppe Afterthis articlehadbeen reviewedby référéesand accepted by theeditor, theauthors becameawareofasimilarwork published byTrono& Resta(2007). Notwithstanding,theydecided to publish theirpaperbecause itcontainsusefill illustrationsand important information aboutthedistribution and thedescription ofboth species. Trono, D. & Piccioli Resta,G. 2006(2007). Sull'errata segnalazionedi Semipallium coruscans coruscans (Hinds. IS45) (Bivalvia: Pectinidae) in Mediterraneo. Bolletino Malacologico42(9-12): 101-105. 103 V PkMi . I issl LLI& Cill III Semipallium coruscans coruscans va the Adriatic Sea i2()0(i) report it as: "From Mediterranean Sea and the eroded a i\nc reticulating pattern of lamellae covers adjacent Atlantic Océan; from Portugal to Cape Verde the vvhole \al\e (Figs 31, 34). Left valve lias primary including the A/ores and Canarj Islands" and about ribs more pronounced, more rounded and the habitat the\ report: "'littoral to sublittoral zone, under mtercostals spaces are larger than the ribs. In the right rocks on gravellj sandy bottoms with coral rubble". \al\e thèse ribs are tlattened and larger than We report that M. pesfelis on the Dalmatian coast is intcrcostals spaces. The number ofsecondary riblets is rather common in the infralittoral zone, and in coral varied on and between primary ribs. Ribs of anterior bottoms. In shell grit coming from red coral bottoms. auricles are also différent and in the left valve thèse 40-100 m deep, live specimens are of small or ribs are nodulous while in the right valve they are médium si/e while big specimens are rare and usually lamellose. On the dorsal margin of posterior auricles dead. there are 5-6 strong tubercles (Fig. 33). lt li\es. attached with a byssus, in fissures in the rocks The sculpture ofjuvénile specimens is quite différent and in poorly lit caves because it is adverse to light, so from that ofadult ones. mm it is difficult to flnd live specimens because they live In our smallest spécimen of 2.5 (Figs 1-2) both deep in the fissures. valves are sculptured with thin radial striae and a It also likes the old walls built to protect the small shagreen microsculpture is not yet formed, only harbours and many big and beautiful specimens were microscopic lamellae and grooves are visible. mm collected in thèse places at a depth of 1-2 m. In our spécimen of 3.6 (Fig. 3), which is almost The first author never found this species under stones identical to that figured in the work ofSiletic (2004), where, on the contrary, Mimachlamys varia varia already is présent a shagreen microsculpture and some (Linné, 1758) and Talochlamys multistriata (Poli, secondary riblets are formed. 1795) are very common. In our spécimen of6.7 mm (Figs 4-5) both valves are CLEMAM (2007) gives a différent genus to thèse sculptured with primary and secondary riblets, species but we prefer to use the names proposed by irregularly arranged, and a shagreen microsculpture Dijkstra & Goud (2002) and Dijkstra & Gofas (2004) covers the entire surface of the valves except in the because we noticed that CLEMAM is not updated umbonal area. In this growth stage tubercles on the with the names used in thèse two works. dorsal margin ofauricles are notyet formed. The type locality ofSemipallium coruscans coruscans In our spécimen of 13.0 mm (Figs 6-7) there is already is: Anna Maria Port, Nukuhiva, Marquesas Islands a sculpture similar to that in adult specimens. Primary and it lives byssally attached in areas with clear water radial costae are well formed and secondary radial and it prefers areas through which strong streams run riblets are on and between the primary ribs. On the on the external side ofthe reefs or the passage to the anterior auricle of the left valve the ribs become internai lagoon, at a depth of about few dm up to nodulous and on the edge ofposteriorauricle there is a about 20 m (Dijkstra, 1983). The report of Raines & strong tubercle. In this spécimen too the entire surface Poppe (2006) is short: "Indo-Pacific région, to include of both valves is covered with a shagreen the eastern and southern coast ofAfrica". The habitat microsculpture. is stated as: "littoral zone, byssally attached to rocks orcoral on sandy bottom", no depth is given. Semipallium coruscans coruscans. The sculpture of The species is not reported for the Red Sea by Oliver our specimens (Figs 8-13) consist of 14 or 15 primary (1992) and Orlin & Dekker (2000) as already stated radial ribs, regularly arranged, and numerous by Siletic (2004) so it cannot be considered a secondary riblets mostly on primary ribs and very few lessepsian migrant. between them. The layerwith shagreen microsculpture is eroded in ail our specimens and a fine reticulating Material examined. Manupecten pesfelis from Mljet pattern of lamellae covers the valves. Only on left Island (Croatia) 60-90 m deep: 1 spécimen of2.5 mm, valve ofour spécimen of5.5 mm is one small part of 1 spécimen of3.6 mm, 1 spécimen of 6.7 mm and 1 this shagreen microsculpture preserved (Fig. 21). mm spécimen of 13.0 ail from Giunchi-Tisselli In between the secondary riblets a séries of collection ex Jakov Prkic collection (Figs 1-7). microscopic pits can be seen. Semipallium coruscans coruscans from Raiatea Island On the dorsal margin ofauricles tubercles are absent. (French Polynesia): spécimen of 5.5 mm, 1 1 spécimen of 9.0 mm and 1 spécimen of 10.7 mm ail Discussion and conclusion. The main différences that from Giunchi-Tisselli collection (Figs 8-13). distinguish M. pesfelis from S. coruscans coruscans are the large tubercles on the auricles and distinctly Description of our material. Manupecten pesfelis. lower number of primary ribs (7 or 8 against 14 or The sculpture of adult specimens consists of 7 or 8 15). The adult specimens are also much bigger (65-85 primary radial ribs and numerous secondary radial mm against 15-22 mm). M riblets on and between primary ribs. The entire surface The comparison ofjuvénile specimens of pesfelis ofthe shell is covered with a layer consisting ofvery and S. coruscans coruscans of about the same size, fine honeycomb-like microsculpture, giving the shell a also show some différences. shagreen look. This layer is relatively soft and it can The shMagreen microsculpture is similar in both species be easily removed or damaged. When removed or but in pesfelis it is more prominent and the cells 104 & PRK.IC,TlSSELLI GlL'NCHI Novapex 8 (3-4): 103-1 10. 10 décembre 2007 Figures 1-7. Manupectenpesfelis (Linné. 1758) from Mljet Island (Croatia). 60-90 m. 1-2. H = 2.5 mm. 1. right valve. 2. left valve; 3. H = 3.6 mm, left valve: 4-5. H = 6.7 mm. 4. right valve, 5. left valve: 6-7. H = 13.0 mm. 6. right valve. 7. left valve. 105 V l'Kkli . I InsI LL1& Cill III Semipallium coruscans coruscans in the Adriatic Sea Figures 8-13. Semipallium coruscans coruscans (Hinds, 1845) from Raiatea Island (French Polynesia). 8-9. H = 5.5 mm, 8. right valve, 9. left valve; 10-11. H = 9.0 mm, 10. right valve, 11. left valve; 12-13. H = 10.7 mm, 12. right valve, 13. left valve. 106 Prkic,Tisselli & GlUNCHI Novapex 8 (3-4): 103-1 10, 10 décembre 2007 are deeper and larger than those in S. coruscans ACKNOWLEDGEMENTS coruscans. It seems that, in the second species, this microsculpture is very délicate and consequently itMis We wish to thank Dr. H.H Dijkstra (University of usually eroded while in juvénile spécimens of Amsterdam, The Netherlands) for some information pesfelis it is usually very well preserved. about bibliography. In the Indo-Pacific species primary radial ribs are well formed and regularly arranged in ail three spécimens REFERENCES (Figs 8-13) while in M. pesfelis thèse ribs are irregularly arranged (Figs 3-5). Only in size of 13 mm CIESM: Atlas ofExotic Molluscs in the M. pesfelis (Figs 6-7) show well-formed primary ribs Mediterranean but they are différent in number and shape than those http://www.ciesm.org/atlas/appendix3.html (seen in S. coruscans coruscans ofthe similar size. 17 May 2007). Also the sculpture of auricles is différent and in M. CLEMAM: Check List ofEuropean Marine Mollusca. pesfelis radial and concentric sculpture are more http://www.somali.asso.fr/clemam/index.html prominent (Figs 14-29). In the size of 13 mm M (seen 17 may 2007). pesfelis already has one strong tubercle on the edge of Dijkstra, H.H. 1983. Pettinidi rari e poco noti. La XV posteriorauricles (5-6 in adult ones). Conchiglia, (176-177): 3-5. The séries of microscopic pits which are visible in Dijkstra, H.H. 1999. Type spécimens ofPectinidae between secondary riblets of S. coruscans coruscans (Mollusca: Bivalvia) described by Linnaeus (1758- are notprésent in M.pesfelis. 1771). ZoologicalJournaloftheLinnean Socierw Siletic (2004) described S. coruscans coruscans (from 125:383-443. & Indo-Pacific région) as follows: "exterior shell surface Dijkstra, H.H. Gofas, S. 2004. Pectinoidea main characteristic are: 12-15 primary tripartite radial (Bivalvia: Propeamussiidae and Pectinidae) from ribs, from which 1-2 intercostals secondary radial some north-eastern Atlantic seamounts. Sarsia riblets are formed, determining about 65 secondary 89(l):33-78. riblets and a shagreen microsculpture between the Dijkstra, H.H. & Goud, J. 2002. Pectinoidea(Bivalvia, & costae". This description agrées very well with our Propeamussiidae Pectinidae) collected during spécimens from Raiatea Island. the Dutch CANCAP and MAURITANIA She described the single spécimen from Croatia as expéditions in the south-eastern région ofthe follows: "Our spécimen of Semipallium coruscans North Atlantic Océan. CANCAP-Project mm mm coruscans is 4.8 high and 5.2 long 14 radial contribution No. 127. Basteria, 66 (1-3): 31-82. ribs are présent, with some secondary riblets in initial Oliver, P. G. 1992. BivalvedSeashells oftheRedSea. stage that however form a strongly developed Ed. Verlag Christa Hemmen (Wiesbaden) and shagreen microsculpture on the lower halfofthe shell, National Muséum ofWales (Cardiff) printed in near the ventral side of the shell. The colour of the Darmstad, 330 pp. shell is yellowish-brown, with white tinges and Orlin, Z. & Dekker, H. 2000. Check-list ofRed Sea blotches in the centre ofthe shell, and a brownish part Mollusca. Soortenlijst van Rode Zee Mollusca. near the umbo, at the beginning ofthe auricles". Our Spirula, 47 (supplément), 46 pp. mm & spécimen of3.6 (Fig. 3) agrées very well with this Raines, B.K. Poppe, G. T. 2006. TheFamily description. Pectinidae. A Conchological Iconography by After thèse observations it is obvious that the only Poppe G. T. & Groh K. Edited by ConchBooks, spécimen figured by Siletic (2004) belongs to the Hackenheim, 402 pp. same species as our spécimens from Mljet Island so Paulay, G. 2003. Marine Bivalvia (Mollusca) of that the report of Semipallium coruscans coruscans Guam. Micronesica, 35-36: 218-243. from Adriatic Sea should be considered as a Siletic, T. 2004. First record ofSemipallium coruscans misidentification ofManupectenpesfelis. coruscans (Hinds, 1845) (Bivalvia: Pectinidae) in Ourconclusion is also supported by CLEMAM (2007) the South Adriatic Sea (Mljet Island, Croatia). and CIESM (2007): they do not report this alien Bollettino Malacologico, 40 (5-8): 57-59. species in their lists. Siletic, T. 2006. Marine fauna ofthe Mljet National We notice now that Semipallium coruscans coruscans Park (Adriatic Sea, Croatia). 5. Mollusca: (Hinds, 1845) should be placed in the genus Bivalvia. Natura Croatica, 15 (3): 109-169. Pascahinnites Dijkstra & Raines, 1999 as stated by Wagner, H.P. 1991. Review ofthe European Paulay (2003). Pectinidae (Mollusca: Bivalvia). Vita Marina. 41 : 3-48. 107 M PRICK . Ilssl LLI& (ill III Semipallium coruscans coruscans in the Adriatic Sea Figures 14-17. Manupecten pesfelis (Linné, 1758) from Mljet Island (Croatia), 60-90 m, size 6.7 mm. 14. auricles ofthe right valve, 15. détail ofthe right valve, 16. auricles ofthe left valve, 17. détail ofthe left valve; 18-21. Semipallium coruscans coruscans (Hinds, 1845) from Raiatea Island (French Polynesia), size 5.5 mm. 18. auricles ofthe right valve, 19. détail ofthe right valve, 20. auricles ofthe left valve, 21. détail ofthe left valve. Scale bar= mm. 1 108 PRKIC,TlSSELLI & GlL'NCHI Novapex 8 (3-4): 103-1 10, 10 décembre 2007 Figures 22-25. Mamtpecten pesfelis (Linné, 1758) from Mljet Island (Croatia). 60-90 m, H = 13.0 mm. 22. auricles ofthe right valve, 23. détail ofthe right valve, 24. auricles ofthe left valve. 25. détail ofthe left valve: 26-29. Semipallium corusccms coruscans (Hinds, 1845) from Raiatea Island (French Polynesia), H = 9.0 mm. 26. auricles ofthe right valve, 27. détail ofthe right valve, 28. auricles ofthe left valve, 29. détail ofthe left valve. Scale bar= mm. 1 109 l'Kkli . l'issl LLI& Gll N< III Semipallium coruscans coruscans in the Adriatic Sea Figures 30-34. Manupectenpesfelis (Linné, 1758). 30. spécimen from Secca délie Murelle (Viterbo, Italy), H 22.0 mm, 31. détail ofsculpture; 32. spécimen from Altafiumara (Reggio Calabria, Italy), H = 60.0 mm, 33. détail ofauricles, 34. détail ofsculpture. 110