Umbilibalcis lata ( Dall, 1889b )

Souza, Leonardo Santos De, Pimenta, Alexandre Dias & Barros, José Carlos Nascimento De, 2021, Revision of the deep-sea Eulimidae (Gastropoda, Caenogastropoda) from off Northeast Brazil, Zootaxa 4927 (4), pp. 451-504 : 493-495

publication ID

https://doi.org/10.11646/zootaxa.4927.4.1

publication LSID

lsid:zoobank.org:pub:AED51D9E-1751-4010-A8E1-B72AE428821A

DOI

https://doi.org/10.5281/zenodo.4557520

persistent identifier

https://treatment.plazi.org/id/03E687A2-FF94-FFF2-FF5F-82B0FD6241A9

treatment provided by

Plazi

scientific name

Umbilibalcis lata ( Dall, 1889b )
status

 

Umbilibalcis lata ( Dall, 1889b)

( Figure 24 View FIGURE 24 A–I)

Aclis (supranitida var.?) lata Dall, 1889b: 324–325 , plate 18, figure 8.

Aclis lata: Dall (1889a: 126 , plate 18, figure 8) [reproduced from original illustration].

Hemiaclis lata: Bartsch (1947: 18 , plate 4, figure 4)

Umbilibalcis lata: Bouchet & Warén (1986: 444–445 , figure 1056–1057).

Type material. Holotype USNM 126790 View Materials ( Figure 24A View FIGURE 24 ). Type locality. Barbados, 183 m.

Material examined. Type material; USA: USFC stn. 2404 (28°44′N 85°16′W, 110 m), coll. 15/iii/1885: USNM 323963 View Materials [1 dd]; USBF stn. 20030 (~24°25′N 82°58′, 164 m): GoogleMaps USNM 407033 View Materials [1 dd]. Antigua and Barbuda: English Harbor, S.U.I. stn. 496 (219 m): USNM 459689 View Materials [1 dd]. Barbados: Off Pelican Islands, S.U.I. Expedition stn. 454 (182 m): USNM 459677 View Materials [1 dd]; Off Lazareto, S.U.I. Expedition stn. 497 (171 m): GoogleMaps USNM 459708 View Materials [1 dd]. Brazil: Rio Grande do Norte: (04°51′S 35°06′W, 375 m), 24/xi/2001: MNRJ 35200 View Materials † [1 dd]; GoogleMaps Bahia: (11°35′31″S 37°12′18″W, 510 m), 30/x/2000: GoogleMaps MNRJ 35268 View Materials † [3 dd]; REVIZEE-Central V stn. 504 (14°28′55″S 38°54′03″W, 278 m), coll. Supply Boat Astro Garoupa, 02/vii/2001: GoogleMaps IBUFRJ 14399 † [5 dd]; Espírito Santo: REVIZEE-Central V stn. 25a (19°33′28″S 38°45′28″W, 230 m), coll. Supply Boat Astro Garoupa, 28/vi/2001: GoogleMaps IBUFRJ 19717 † [3 dd]; Rio de Janeiro: Campos Basin (22°18′53″S 40°11′59″W, 200 m), coll. Supply Boat Astro Garoupa, 18/xii/2004: GoogleMaps MNRJ 31867 View Materials † [2 dd]; GoogleMaps Campos Basin (22°42′33″S 40°41′24″W, 110 m), coll. 19/ix/2003: GoogleMaps MNRJ 31881 View Materials † [2 dd], MNRJ 31895 View Materials † [1 dd]; GoogleMaps PADCT stn. 6541: GoogleMaps MNRJ 28285 View Materials † [3 dd]; PADCT stn. 6627: MNRJ 28287 View Materials † [1 dd]; Cabo Frio VII stn. 6194 (24°03′36″S 44°07′36″W, 134 m), coll. RV Almirante Saldanha, 01/iv/1983: GoogleMaps IBUFRJ 19727 † [1 dd]; S„o Paulo: REVIZEE Sul stn. 6672: MNRJ 28289 View Materials † [1 dd]; PADCT stn. 6573: MNRJ 23226 View Materials † [1 dd]; GoogleMaps Paraná: REVIZEE Sul stn. 6653: MNRJ 28288 View Materials † [1 dd]; GoogleMaps Santa Catarina: REVIZEE Sul stn. 6695: MNRJ 28290 View Materials † [1 dd]; PADCT stn. 6595: MNRJ 28283 View Materials † [7 dd]; PADCT stn. 6606: MNRJ 28286 View Materials † [1 dd]; GoogleMaps Rio Grande do Sul: off Bojuru (220 m), coll. RV Almirante Saldanha, xi/1979: MORG 21416 † [1 dd] GoogleMaps .

Redescription (Holotype). Shell conical, straight, reaching about 5.4 mm long, 2.4 mm wide. Larval shell brownish, partially broken. Teleoconch with about 8.0 whorls, slightly convex outline; suture distinct, sloping; subsutural region not visible; surface polished, presenting slightly opisthocline axial lines; incremental scars slightly demarcated, appearing at irregular intervals. Last whorl about 45% of the shell length; base rounded.Aperture wide, pear shaped, acute posteriorly and rounded anteriorly; outer lip thin, slightly prosocline, sinuous, slightly retracted near the suture, reaching a maximum projection in the middle of its height, retracted at distal region; inner lip sinuous, sloping, reflected and well demarcated. Umbilicus present. Shell whitish.

Measurements. Holotype USNM 126790, 10 whorls (protoconch partially broken), SL= 5.4 mm; BWL= 2.5 mm; AL= 1.6 mm; SW= 2.4 mm; AW= 1.2 mm. IBUFRJ 14399, 10 whorls, SL= 5.0 mm; BWL= 2.3 mm; AL= 1.4 mm; SW= 2.2 mm; AW= 1.1 mm.

Remarks. The protoconch is partially broken in the holotype of Umbilibalcis lata ( Figure 24A View FIGURE 24 ), but the general shape, dimensions and sculpture fits perfectly with specimens from Brazil ( Figure 24 View FIGURE 24 B–I). The protoconch of the shells from Brazil have about 3.0 whorls, the first (embryonic) whorl with a smooth surface, the remaining whorls with strongly opisthocline axial lines ( Figure 24 View FIGURE 24 H–I). The protoconch is about 270 μm wide and 390 μm in height. A weak brownish band close to suture is present on the protoconch of fresh specimens. The outer lip of the holotype is also partially broken, but it seems uniform in all specimens that the proximal area is slightly advanced, giving a prosocline outline.

Umbilibalcis lata differs from U. crassula Bouchet & Warén, 1986 and U. subumbilicata (Jeffreys, 1883) by the higher number of protoconch whorls (3.0 vs. 1.5 in U. crassula and U. subumbilicata ) and by the straighter outer lip ( Bouchet & Warén 1986).

Geographical distribution. USA: Florida (present study); Antigua and Barbuda (present study); Barbados ( Dall 1889b); Brazil: Rio Grande do Norte, Bahia, Espírito Santo, Rio de Janeiro, S„o Paulo , Paraná, Santa Catarina, Rio Grande do Sul (present study).

Bathymetric distribution. From 60 m to 375 m.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Littorinimorpha

Family

Eulimidae

Genus

Umbilibalcis

Loc

Umbilibalcis lata ( Dall, 1889b )

Souza, Leonardo Santos De, Pimenta, Alexandre Dias & Barros, José Carlos Nascimento De 2021
2021
Loc

Umbilibalcis lata: Bouchet & Warén (1986: 444–445

Bouchet, P. & Waren, A. 1986: 445
1986
Loc

Hemiaclis lata:

Bartsch, P. 1947: 18
1947
Loc

Aclis (supranitida var.?) lata

Dall, W. H. 1889: 325
1889
Loc

Aclis lata: Dall (1889a: 126

Dall, W. H. 1889: 126
1889