Graptacme semistriolata (Guilding, 1834)

Caetano, Carlos Henrique Soares, Scarabino, Victor & Absalão, Ricardo Silva, 2006, Scaphopoda (Mollusca) from the Brazilian continental shelf and upper slope (13 º to 21 ºS) with descriptions of two new species of the genus Cadulus Philippi, 1844, Zootaxa 1267, pp. 1-47 : 22-24

Graptacme semistriolata (Guilding, 1834)

Figs. 46–47

+ Dentalium semistriolatum Guilding 1834: 34 , pl. 3, figs. 1–5.

+ Dentalium (Graptacme) semistriolatum: Henderson 1920: 69 , pl. 11, figs. 1–3, 8, 9; Maury 1922: 37; Turner 1955: 313; Warmke and Abbott 1961: 224, fig. 34a; Abbott 1974: 386; Penna­Neme 1974: 111.

+ Graptacme semistriolatum: Scarabino 1985: 199 , pl. 72, fig. 1019; 1994: 307, pl. 106, fig. 1507; Cabral and Mello 1994: 38, fig. 10; Díaz and Puyana 1994: 256, pl. 71, fig. 1042.

+ Graptacme semistriolata: Redfern 2001: 190 , pl. 76, figs. 781a, 781b.

Type material

not located.

Type locality

"in arenosis Oceani Caribaei" (by original designation).

Diagnosis

Shell medium (to 46 mm), rapidly tapering, well curved. Translucent, brilliant, salmon tint at apex, alternating opaque bands throughout. Numerous longitudinal striae at apex; remainder smooth. Long, narrow, irregular slit at apex usually placed laterally. Section circular throughout.

Material examined

IBUFRJ 14249, sta 42, 5 lv, 9 dd; IBUFRJ 14247, sta 49, 1 lv, 2 dd.

Distribution

USA: Bermuda and Florida; Caribbean Sea: off St. Martin; Cuba (Henderson 1920); Bahamas (Redfern 2001); Virgin Islands (Turner 1955); Progreso, Southern Mexico ( Baker 1891); Brazil: Amapá to São Paulo (Penna­Neme 1974; Scarabino 1975, 1985, 1994). Living 20 to 75 (Penna­Neme 1974) and in unknown condition down to 150 m.

Remarks

Steiner and Kabat (2004) considered G. semistriolata as a junior synonym of G. semistriata (Turton, 1819) , from tropical East Pacific waters. According to these authors, this pattern of distribution could suggest the existence of sibling species. We prefer to maintain both species as valid until further taxonomic and/or molecular studies better resolve their status.

Figures

FIGURES 39 – 56. Genus Graptacme and Fustiaria. (39 – 43) Graptacme calamus, (39 – 40) Lectotype USNM 68117, 19 mm, (41 – 43) IBUFRJ 14232, 18 mm; (44 – 45) Graptacme perlonga, IBUFRJ 13866, 61 mm; (46 – 47) Graptacme semistriolata, IBUFRJ 14247, 35 mm; (48 – 52) Fustiaria liodon, (48) Holotype ANSP 35554, 25 mm, (49 – 52) IBUFRJ 14252, 30 mm; (53 – 56) Fustiaria stenoschiza, (53 – 54) Syntype ANSP 71081, 35 mm, (55 – 56), IBUFRJ 10587, 26 mm.