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The genus Afer Conrad, 1858 (Gastropoda : Buccinidae), with descriptions of a new subgenus and a new species from western Africa PDF

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Preview The genus Afer Conrad, 1858 (Gastropoda : Buccinidae), with descriptions of a new subgenus and a new species from western Africa

K. Fraussen NOVAPEX 9(1): 41-48, 10 avril 2008 The genus Afer Conrad, 1858 (Gastropoda: Buccinidae), with descriptions of a new subgenus and a new species from western Africa Koen FRAUSSEN Leuvensestraat 25, B-3200 Aarschot, Belgium [email protected] KEY WORDS.Afer, Streptosiphon, Sénégal, Mauretania, new subgenus, new species. ABSTRACT. A remarkable species ofAfer from Mauretania is described as new. The generic placement is based on protoconch morphology, which is identical to the other known Afer species. Conchological characteristics ofthe teleoconch whorl are peculiar and serve as the basis for the new subgenus Praecantafer subgen. nov. to accommodate the new species: Afer (Praecantafer) echinatus sp. nov. Species formerly assigned to Streptosiphon Gill, 1867 are confirmed as distinct from typicalAferConrad, 1858 and the status ofStreptosiphon is restored at the subgeneric level. INTRODUCTION ZMA: Zoologisch Muséum, University of Amsterdam, Amsterdam, Netherlands The description ofthis new species is based on two ZMB: Muséum fur Naturkunde (Zoologisches spécimens that were collected some 30 years apart. Muséum), Humboldt Universitât, Berlin, Germany Both spécimens originate from the by-product of fisheries surveys carried out on the rich bottoms of SYSTEMATICS the coastal Sahara upwelling, extending from southern Morocco to Mauritania. The holotype was BUCCINIDAE Rafinesque, 1815 collected in 1982 onboard R/V N'Diago by Dr Bertrand Richer de Forges while he was working for GenusAferConrad, 1858 the Centre National de Recherche Océanographique Afer Conrad 1858. Type species: "Fusus afer et des Pêches (CNROP) in Nouadhibou, Mauretania. (Lamarck)" by original désignation = Murex afer The origin of the paratype is less précise. It was Gmelin, 1791 (type locality: "Habitat ad Sénégal"). collected during a fishery survey carried in the 1950s onboard R/VPrésident Théodore Tissierby what was The genus Afer went through a confusing taxonomic then the French Institut Scientifique et Technique des history. It was placed in several families: "Fusidae" Pêches Maritimes (ISTPM); regrettably, the samples by Tryon (1881: 69, for Afer afer), Buccinidae by were incompletely labelled and the station data are Tryon (1881: 99, for Streptosiphon porphyrostoma), lost, but we know that the survey sampled southern "Vasidae" (now Turbinellidae) by Thiele (1931: 343) Morocco and/or Mauretania. Although the région is and Wenz (1941: 1306), Fasciolariidae by Abbott the target of intensive commercial fisheries, it has (1959: 15), Buccinidae by MacNeil (1960: 75, with remained almost unexplored by académie research Siphonofusus Kuroda & Habe, 1954 a synonym of vessels, and the new Afer may be less rare than Afer), Turbinellidae by Abbott & Dance (1986: 210) indicated by the finding ofjust two spécimens in 30 and Vaught (1989: 52, as a subgenus of Tudivasum years. Rosenberg & Petit, 1987). Not untill 2000 (Fraussen & Hadorn, 2000: 28-42), when the radulae of the Abbreviations. known Atlantic species were prepared and the placement in Buccinidae confirmed. BM(NH): British Muséum (The Natural History The genus was used in a broad sence by Fraussen & Muséum), London, England Hadorn (2000: 28-42) and Monsecour & Monsecour K.BIN: Koninklijk Belgisch Instituut voor (2005: 23-32), without subgeneric splitting. In the Natuurwetenschappen, Brussels, Belgium présent study Streptosiphon is recognized as distinct K.F: Collection Koen Fraussen, Aarschot, Belgium. from typical Afer and retracted from its synonymy. KMMA: Klaipeda Maritime Muséum and Aquarium, Streptosiphon is restored at the subgeneric level. In Klaipeda, Lithuania addition, Praecantafer subgen. nov. is described to MNHN: Muséum national d'Histoire naturelle, accommodate the peculiar Afer {Praecantafer) Paris.France echinatus sp. nov. NMBE: Naturhistorisches Muséum Bern, Bern, Still no opportunity has appear to study the radula of Switzerland Afercumingi(Reeve, 1844), a species from Japan and Taiwan. A. cumingi is conchologically similar to the 41 k KM SM \ The gcnus AferConrad, 1858 I West \frican species, but the louer columellar tooth nov. described below), a quite columbariid shape: a is folded in .t particular waj similar to the gcnus rather short spire and a long siphonal canal. Tudicla ROding, 1798, Further stud) is needed to Euthria M. F. Gray, 1850 (type species: "Fusus confirm the generic placement ofthis species. lignarius Chiaje", this is Fusus Ugnarius Lamarck, lu the présent paper onl\ the Récent species are 1816, a junior synonym of Murex corneus Linnaeus, discussed. 1758, from Mediterranean Sea) has a similar radula \\en/ (1941) considered the following two fossil taxa and may hâve a similar shape and pattern but differs as subgenera of [fer. Further study is required to in having a smaller protoconch, usually a shorter either confirm their subgeneric status or to recognize siphonal canal and an outer lip which has a smooth theni as distinct gênera: inside or with lesser pronounced internai lirae. Hercorhyncus Conrad, 1868 (type species: Fusus Euthriostoma Marche-Marchard & Brebion, 1977 tippanus Conrad. 1860) from the Cretaceous of the (type species: Euthriostoma gliberti Marche- USA. placed in Vasidae. as subgenus of Afer, by Marchard & Brebion, 1977, by original désignation) Wenz, 1941; placed in Fusininae, by Sohl 1964a differs in having a small protoconch. The shells are (220) & 1964b (376); placed in Fasciolariidae easily recognized by the large, heavy, white shells (Cretaceous Group) by Snyder(2003: 237). with high spire. Streptopelma Cossmann. 1901 (type species: Peristernia linteus Tate, 1888) from the Eocene of Range. West Africa, from Ivory Coast in the south Australia, placed in Vasidae, as subgenus ofAfer, by {A. (A.) afer) to Morocco (Agadir) in the north (A. Wenz, 1941; placed in Fasciolariidae (Peristernia (Streptosiphon) lansbergisi). Maybe also West- Group)bySnyder(2003: 311). Pacific [should "Afer" cumingi (Reeve, 1844) be shown to be referable to this genus]. Diagnosis. Shell thick, solid. Shape broadly fusiform SubgenusAferConrad, 1858 or slender. siphonal canal rather long, open. Figs. 7-8 Protoconch typical, papilliform, higher than broad, whorls smooth and glossy. Teleoconch whorls Diagnosis. Shell thick, solid. Shape from moderately usually with angular shoulder. Sculpture consisting slender with short spire to elongate with élégant of. usually dominant, spiral cords in combination spire, siphonal canal long, open. Protoconch typical with axial ribs. Aperture oval, columella curved, for genus. Whorls with slightly angular shoulder, callus narrow and thin or broad and thick. Outer lip sculpture consisting of sharp spiral cords with broad thick. usually with numerous internai knobs, interspaces and of narrow, rather sharp axial ribs. occasionally smooth. Aperture oval, columella gently curved, callus narrow Radula typical buccinid. Central tooth with broad and rather thin, outer lip thick with numerous internai base (rather triangular or semi-oval), tricuspid. knobs, edge sharp. Latéral teeth with 3 pointed cusps, outermost cusp Radula typical buccinid. Central tooth rather largest. triangular, base concave, top slightly elevated, tricuspid, cusps of equal size, central cusps Comparison. The genus Afer is characterized by the eventually slightly larger. Latéral teeth with 3 pointed multispiral, papilliform protoconch, higher than cusps, outermost cusp largest. broad. smooth. glossy, with nicely rounded tip. Serratifusus Darragh, 1969 (type species: Fusus Comparison. The subgenus Afer is characterized by craspedotus Tate, 1888, OD, from the Miocène of the sharp spiral sculpture and the narrow columellar southeast Australia) differs in having a smaller lip. The radula ofA. {A.) afer is similar to the radula protoconch with a deviated axis for the firstwhorl, an of Euthria cornea (Linnaeus, 1758), as figured by even longer siphonal canal which may be bended or Cooke (1917, fig. 1), with a rather triangular central torsed and a radula with more rectangular central tooth with concave base. For différences with cusp. The genus Serratifusus has, together with Afer Streptosiphon and Praecantafer subgen. nov. See (and especially its subgenus Praecantafer subgen. comparisons under those subgenera. Figures 1-6 1-6.Afer{Praecantafer) echinatus sp. nov., MNHN 1-2. Mauretania, continental shelf, N. O. "N'diago" stn. 85, 20°07'N, 17°38'W, 200 m, holotype 9964, 26.7 mm; 3-4. operculum ofholotype; 5-6. Dredged between Morocco and Sénégal, R. V. "Président-Theodore-Tissier" cruise, paratype MNHN 9965, 29.5 mm. 42 K. Fraussen NOVAPEX 9(1): 41-48, 10 avril 2008 43 K I K U ssl \ I lie genus Afer Conrad, 1858 Range. West Vfrica, mainlj from Sénégal I. (A.) The radula ofA. (S.) porphyrostoma is similar to afer i> known from as soutfa as [vorj Coast. A. (A.) the radula of Buccinulum vittatum (Quoy & pseudofusinus is known from as nortfa as northem Gaimard, 1833) as llgured by Cooke (1917, Figs. Mauriiania aiul from fisherman off the C'unuiy 4-5) (his fig. 4 being forma littorinoides), with a Islands rhe next two species arc included m the broad, ratheroval central tooth. subgeiuiv The subgenus Afer can be distinguished by its sharper spiral sculpture, its narrow inner lip Afer (Afer) afer(Gmelin, 1791) (callus) and in having a radula with a more Figs. 7-8 triangular central tooth with a more concave base and sharper edges. For différences with Murex afer Gmelin. 1791: 3558, sp. 129 (type Praecantafer subgen. nov. see comparisons under locality: Sénégal "Habitat ad Sénégal"). that subgenus. The spécimen llgured by Adanson (1757, pi.8, tlg.18 "Lipin") is considered the type. This Range. West Africa. A. (S.) porphyrostoma is spécimen is probably lost. known from Sénégal. A. (S.) lansbergisi is known from Mauritania in the south, along Western Afer(Afer)pseudofusinus Fraussen & Hadorn, Sahara, to Morocco (Agadir) in the north. The next 2000 two species are included in the subgenus. Aferpseudofusinus Fraussen & Hadorn, 2000: 32- Afer(Streptosiphon)porphyrostoma 34, figs. 1-3, 5-6 (type locality: continental shelf (Reeve, 1847) offMauriiania, Meteor stn. 60.78, 17°17' N, 16°28' Figs. 9-10 W, 95 m deep). HolotypeMNHN6315. Fasciolaria porphyrostoma Reeve, 1847: pi.5, sp.l 1 (type locality: "Eastern Seas" is erroneous). SubgenusStreptosiphon Gill, 1867 Sometimes, and also by Reeve himself, referred to Figs. 9-10 "Adams & Reeve, Voy.Sam.", meaning the publication of "The Zoology of the Voyage of Streptosiphon Gill, 1867: 152, as genus, type H.M.S. Samarang" in 1848-1850. The author of species by original désignation: Tudicla this species however is Reeve, 1847. porphyrostoma (Reeve, 1847). Probable holotype in BM(NH), nr. 1875.12.10.163 (Delsaerdt, 1993:91). Diagnosis. Shell thick, solid. Shape moderately slender with short, conical spire, siphonal canal Junior synonym: Tudicla recurva A. Adams, 1854: long, open. Protoconch typical for genus. Whorls 135-136, sp. 26, pl.28, fig.4 (type locality: with slightly angular shoulder, smooth, sculpture "Sénégal"). consisting ofFine spiral lines as interspaces and of 5 syntypes in BM(NH) nr. 1992158. broad, rather blunt axial ribs. Aperture oval, columella gently curved, callus broad and rather Afer(Streptosiphon) lansbergisi Delsaerdt, 1993 thick, forming a wide inner lip, outer lip thick with numerous internai knobs, edge sharp. Afer lansbergisi Delsaerdt, 1993: 89-96, 5 figs. Radula typical buccinid. Central tooth broad, (type locality: "near the coast of Sierra Leone, in weakly curved, tricuspid, cusps of equal size. 15-40mdepth"). Latéral teeth with 3 pointed cusps, outermost cusp Holotype in KMMA, nr. KJM 7642 largest. For the history of the confusion between A. Comparison. Streptosiphon is characterized by its porphyrostoma and spécimens of A. lansbergisi, rather smooth shell and the broad columellar lip. see Delsaerdt (1993: 92). Figures 7-12 7-8.Afer(Afer) afer(Gmelin, 1791), 34.6 mm, protoconch 1.5 mm, Gorée, Sénégal, KF nr. 2959. 9-10.Afer(Streptosiphon)porphyrostoma (Reeve, 1847), 38.7 mm, protoconch 1.7 mm, M' Bour, Sénégal, 10-20 m, KF nr. 2360. 11-12.Afer{Praecantafer) echinatus sp. nov., holotype, 26.7 mm, protoconch 1.3 mm, offMauretania, 200 m, MNHN. 44 K. Fraussen NOVAPEX 9 (1 ): 41-48, 1 avril 2008 45 - k I K U ssl \ Thegenus [ferConrad, 1X58 Praecmntmfer subgen. no\ interspaces a fine groove. Remaining whorl suddenly becoming angulate, gradually stronger, forming a rypc species. [fer(Praecantafer)echinatus sp. nov. canna. Penultimate whorl with a second carina parlly concealed under louer suture. Body whorl with 3 Diagnosis. Shell thîn but solid. Shape strong carinae which are ornamented with sharp axial columbariiform, spire rather short, siphonal canal lamellae and 12 smoother spiral cords of différent long, straight, open. Protoconch rather papilliform, Strength on base and siphonal canal. higher than broad, typical tbr genus. Whorls with First 1/8 teleoconch whorl smooth. Ibllowing 1/8 angular shoulder. Sculpture consisting of at least 2 weakly waved. Further worls stringly knobbed on the pronounced, peripheral spiral cords \\ith broad carinae. Subsutural slope smooth, suprasutural part interspaces. Spiral cords on base and siphonal canal slightly waved. weaker. Axial sculpture consisting ofsharp spines on Aperture round. Outer lip thin, simple, edge sharp. top of spiral cords. Aperture oval, columella gently Columella smooth (holotype, subadult). Paratype curved, câlins narrow and rather thin, outer lip with 2 small abapical eolumellar knobs, 1 small usuallj thick without internai knobs, edge blunt. adapical eolumellar knob and some irregular lirae, eolumellar lip thin. sharp. Siphonal canal long. Comparison. The subgenus Afer differs from slender, open. Praecantafer in having a larger number of spiral Operculum corneus, pale brown, ovate, nucleus cords. a shorter siphonal canal, an outer lip with terminal. internai lirae and a sharp edge. The subgenus Animal and radula unknown. Streptosiphon differs in having a smoother sculpture, a usuall} shorther siphonal canal, an outer lip with Comparison. Afer (Praecantafer) echinatus sp. nov. internai lirae and a sharp edge. is characterized by the columbariid shape with a long siphonal canal and a rather broad spire with sharp Range. Only known from the type species. OffWest spiral cords and short spines. Africa, in deep water. Etymology. Afer (Praecantafer) echinatus sp. nov. is Etymology. Praecantafer subgen. nov. is named named after the Latin expression echinatus after the Latin expression praecantare (verb), (adjective), meaning "with spines" or"spiny". meaning "bewitching" which refers to the enchanting ACKNOWLEDGMENTS shell. Afer(Praecantafer) echinatus sp. nov. fm grateful to Jerry Harasewych (National Muséum Figs. 1-6. 11-12. ofNatural History, Smithsonian Institution, USA) for calling my attention to this new species, Philippe Type material. Holotype. 26.7 mm, Mauretania, Bouchet and Virginie Héros (Muséum national continental shelf. N. O. "N'diago" campagne 1981 d'Histoire naturelle, France) for the loan of the type stn. 85. 20°07,N, 17°38'W. 200 m, MNHN 9964. material, Pierre Lozouet (Muséum national d'Histoire Paratype, 29.5 mm. R. V. "Président-Théodore naturelle, France) for bibliographical help, Kevin Tissier" cruise, dredged between Morocco and Monsecour (Belgium) and Yves Terryn (Natural Art, MNHN Sénégal, 9965. Belgium) for digital photography and to David Monsecour(Belgium) forcorrecting the Engish text. Type loeality. Mauretania, continental shelf, N. O. "N'diago" campagne 1981 stn. 85, 20°07'N, REFERENCES 17°38-\V. 200 m. Abbott, R. T. 1959. The family Vasidae in the Indo- Range. Only known from the type material. Pacific. Indo-Pacific Mollusca, 1(1): 15-32. Abbott, R. T. & Dance, S. P. 1986. Compendium of Description. Shell thin, fragile, up to 29.5 mm in Seashells. A colorGuide to More than 4200 ofthe length. Shape columbariiform, with broad, short World's Marine Shells. éd.3. Florida, American spire, siphonal canal elongate. Aperture together with Malacologists, 411 pp. siphonal canal equal to or slightly longer than 2/3 of Adams, A. 1854. Description ofThirty-nine New total shell length. 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