Paradentalium infractum ( Odhner, 1931 ) Odhner, 1931

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 : 12-13

publication ID

https://doi.org/ 10.5281/zenodo.173183

publication LSID

lsid:zoobank.org:pub:DD06702D-A18D-4323-9CAE-D8F315FCCCC7

DOI

https://doi.org/10.5281/zenodo.6258396

persistent identifier

https://treatment.plazi.org/id/CC6E8784-FFF1-FFB4-FF54-FEB8FCE3D499

treatment provided by

Plazi

scientific name

Paradentalium infractum ( Odhner, 1931 )
status

n.comb.

Paradentalium infractum ( Odhner, 1931) n.comb.

Figs. 16–19 View FIGURES 1 – 19

+ Dentalium infractum Odhner 1931: 1 , pl. 1, figs. 1–3, 8, 10, 12, pl. 2, figs. 15–17, 22, 23. + Dentalium (Dentalium) infractum: Scarabino 1973: 195 , pl. 1, figs. 2, 2 a.

+ Dentalium (Antalis) infractum: Penna­Neme 1974: 110 , figs. 2, 4, 5, 6.

+ Dentalium (Antalis) elegantulum Penna­Neme 1974: 108 , figs. 1, 3.

+ Antalis infractum: Scarabino 1985: 198 , pl. 72, fig. 1013; 1994: 306, pl. 106, fig. 1501. + Antalis infracta: Steiner and Kabat 2001: 440 ; 2004: 602.

Type material

Holotype SMNH 1554; Paratypes SMNH 6337, 12 lv, SMNH 6338, 4 dd.

Type locality

"Küste von [Coast of] Uruguay ", 33 °00’S – 51 ° 10 ’W, 80 m (by original designation) but corrected to South Brazil by Scarabino (1973).

Diagnosis

Shell up to 49 mm long, slender, slightly curved, white to yellowish, polished, shining. Six thin primary ribs on posterior half of the shell, dorsal one larger than the others. Anterior half smooth. Secondary ribs present, number variable. Intercostals spaces straight to convex. Apical section hexagonal, oral section circular.

Material examined

Holotype MZUSP 18699; Paratypes MZUSP 18700, 4 dd; MZUSP 18702, 2 dd, of D. elegantulum ; IBUFRJ 7900, sta AV 10,1 dd; IBUFRJ 8024, sta D 1, 1 lv; IBUFRJ 7981, sta D 4, 1 dd; IBUFRJ 14240, sta Y 5, 7 lv, 34 dd; IBUFRJ 14241, sta C 27, 3 lv, 8 dd; IBUFRJ 14242, sta 27, 2 dd; IBUFRJ 14243, sta R 2 # 1, 12 dd; IBUFRJ 14244, sta R 3 # 2, 2 dd; MORG 13864, off São Luiz, Maranhão, 33 m, 1 dd.

Distribution

Brazil: Maranhão (this study), Alagoas, Bahia to Rio Grande do Sul ( Odhner 1931; Penna­Neme 1974; Scarabino 1973, 1975, 1985, 1994); Uruguay ( Scarabino 1973). Living 40–190 m, shells 5 to 269 m (this study).

Remarks

Odhner (1931) described the species from off Uruguay but, as observed by Scarabino (1973), the latitude given by the author corresponds, in fact, to South Brazil. Penna­Neme (1974) identified specimen number MNRJ 3646 as one of the paratypes of D. elegantulum , but it could not be found in MNRJ.

Antalis cerata ( Dall, 1881) and Paradentalium disparile ( Orbigny, 1853) are the most similar species to P. infractum in the western Atlantic. Paradentalium infractum and A.

cerata shared the pattern of alternating sculptured and smooth portions along the shell extent but the latter showns an apex with nine to twelve ribs while P. infractum shown a hexagonal apical section. Additionally, A. cerata has microscopic reticulation in the intercostals spaces (see Fig. 22 View FIGURES 20 – 38 ). The apex is composed of six ribs in both Paradentalium disparile and P. infractum , but in P. d i s p a r i l e the secondary ribs are more numerous and strongest occurring over the entire shell ( P. disparile has no smooth portion).

SMNH

Saskatchewan Museum of Natural History

MZUSP

Museu de Zoologia da Universidade de Sao Paulo

MNRJ

Museu Nacional/Universidade Federal de Rio de Janeiro

Kingdom

Animalia

Phylum

Mollusca

Class

Scaphopoda

Order

Dentaliida

Family

Dentaliidae

Genus

Paradentalium

Loc

Paradentalium infractum ( Odhner, 1931 )

Caetano, Carlos Henrique Soares, Scarabino, Victor & Absalão, Ricardo Silva 2006
2006
Loc

Antalis infractum:

Steiner 2001: 440
Scarabino 1985: 198
1985
Loc

Dentalium (Antalis) infractum: Penna­Neme 1974 : 110

Penna-Neme 1974: 110
1974
Loc

Dentalium (Antalis) elegantulum Penna­Neme 1974 : 108

Penna-Neme 1974: 108
1974
Loc

Dentalium infractum

Scarabino 1973: 195
Odhner 1931: 1
1931