Eulima ephamilla Watson, 1883

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 : 460-462

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.4557497

persistent identifier

https://treatment.plazi.org/id/03E687A2-FFB7-FFD5-FF5F-820FFBAA4671

treatment provided by

Plazi

scientific name

Eulima ephamilla Watson, 1883
status

 

Eulima ephamilla Watson, 1883 View in CoL

( Figure 5 View FIGURE 5 A–E)

Eulima ephamilla Watson, 1883: 116–117 View in CoL . Watson (1886: plate 35, figure 6a–c).

Eulima (“ Liostraca View in CoL ”) stenostoma auct. non Jeffreys, 1858: Dall (1889a: 126).

Eulima (Leiostraca) rectiuscula Dall, 1890: 160 (in part).

Melanella ephamilla ( Watson, 1883) : Lange-de-Morretes (1949: 82); Rios (1994: 103, plate 34, figure 426 [reproduced from original illustration]); Rios (2009: 191, figure 468 [reproduced from original illustration]).

Balcis ephamilla ( Watson, 1883) : Rios (1975: 61, plate 16, figure 239 [reproduced from original illustration]); Rios (1985: 54, plate 20, figure 242 [reproduced from original illustration]).

Type material. Lectotype (herein designated): NHMUK 1887.2 About NHMUK .9.1589 ( Figure 5A, B View FIGURE 5 ) . Paralectotypes (herein designated): NMW 1955.158 View Materials .11088 [2 dd] ( Figure 5C View FIGURE 5 ), from type locality . Holotype of Eulima rectiuscula Dall, 1890 : USNM 87343 About USNM ( Figure 5D, E View FIGURE 5 ), USFC stn. 2668 (30°58′30″N 79°38′30″W, 538 m), coll. 05/v/1886 GoogleMaps .

Type locality. Brazil: off Pernambuco, Challenger stn. 122 .

Material examined. Type material.

Measurements. Lectotype NHMUK 1887.2.9.1589, ~10 whorls (protoconch broken), SL= 8.5 mm; BWL= 3.4 mm; AL= 2.1 mm; SW= 1.8 mm; AW= 1.2 mm. Paralectotype NMW 1955.158.11088, ~10 whorls (protoconch broken), SL= 6.3 mm; BWL= 2.7 mm; AL= 1.6 mm; SW= 1.4 mm; AW= 0.9 mm. Paralectotype NMW 1955.158.11088, ~10 whorls (apex and aperture broken), SL= 8.0; BWL= 3.3 mm; AL= 1.6 mm; SW= 1.7 mm; AW= 0.9 mm. Holotype of Eulima rectiuscula, USNM 87343, ~8 whorls (apex broken), SL= 9.6; BWL= 4.0 mm; AL= 2.4 mm; SW= 2.0 mm; AW= 1.3 mm.

Remarks. The shell numbered NHMUK 1887.2.9.1589 ( Figure 5A, B View FIGURE 5 ) is the figured specimen by Watson (1886: plate 35, figure 6a–c) and is here designated as the lectotype. There are two other shells from the type locality stored in the NMW (NMW 1955.158.11088), which are here considered as paralectotypes. Watson (1883: 116) cited that “the specimen is dead and discoloured”, which could indicate that he referred to a single shell. However, Watson (1883) did not designate holotypes in his descriptions, and as other shells from the same locality were found, we prefer to consider that all were originally syntypes. See discussion for the status of types in the NMW. Watson’s (1883) description is appropriate to the lectotype and there is no need for a redescription. We only add that there is no presence of an umbilical fissure as stated by him in describing a “very minute furrow” behind the inner lip.

Eulima ephamilla presents the general shape typical of Eulima sensu stricto, with an elongated, conical shell of slowly increasing diameter, flat whorls, narrow and elongated aperture as the type species of the genus, E. glabra ( da Costa, 1778) ( Warén 1989).

MolluscaBase Eds. (2020a) cited Eulima rectiuscula Dall, 1890 , from Georgia, USA, as a junior synonym of E. ephamilla without discussion. The holotype of E. rectiuscula ( Figure 5D, E View FIGURE 5 ), collected from the USFC stn. 2668 (vide original label), also has a broken protoconch, but the general outline and dimensions are indistinguishable from the holotype of E. ephamilla . When Dall (1890) described E. rectiuscula , he also referred to samples of this species from the Caloosahatchee, a Plio-Pleistocene formation in Florida ( Allmon et al. 1996). These fossil specimens were later recognized as a distinct species described by Gardner & Aldrich (1919: 39, plate 2, figure 5), currently known as Eulima dalli . In addition to the differences pointed by Gardner & Aldrich (1919), we add that the outer lip of E. ephamilla is more retracted at the proximal area than that of E. dalli . Thus, we consider E. rectiuscula as a junior synonym of E. ephamilla and that E. dalli is a valid species known only from the Miocene and Pliocene ( Olsson & Harbison 1953). Eulima ephamilla is known only from two localities distant from each other by more than 6,000 km.

The general shape of Eulima ephamilla resembles E. incolor Bouchet & Warén, 1986 ( Figure 5F, G View FIGURE 5 ), from deep waters off Spain, and E. psila Watson, 1883 ( Figure 6 View FIGURE 6 A–M), from the western Atlantic. However, E. ephamilla can be distinguished from E. incolor by the relatively bigger shell (holotype of E. ephamilla , 10 whorls, SL= 8.5 mm vs. holotype MNHN-IM-2000-5660 of E. incolor , 11 whorls, SL= 6.6 mm) and by the more elongated shape of the aperture. The aperture of both species is oblong but the ratio AW/AL in E. ephamilla and E. incolor is very different (0.69 and 0.48, respectively). Eulima ephamilla differs from E. psila by the outline of the outer lip, which protrudes in the former ( Figure 5B, E View FIGURE 5 ) and is straight in the later ( Figure 6I View FIGURE 6 ).

Geographical distribution. USA: Florida ( Dall 1890); Brazil: Pernambuco ( Watson 1883).

Bathymetric distribution. From 538 m to 640 m ( Watson 1883; Dall 1890).

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Littorinimorpha

Family

Eulimidae

Genus

Eulima

Loc

Eulima ephamilla Watson, 1883

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

Balcis ephamilla ( Watson, 1883 )

Rios, E. C. 1985: 54
Rios, E. C. 1975: 61
1975
Loc

Melanella ephamilla ( Watson, 1883 )

Rios, E. C. 2009: 191
Rios, E. C. 1994: 103
Lange-de-Morretes, F. 1949: 82
1949
Loc

Eulima (Leiostraca) rectiuscula

Dall, W. H. 1890: 160
1890
Loc

Eulima (“ Liostraca

Dall, W. H. 1889: 126
1889
Loc

Eulima ephamilla

Watson, R. B. 1883: 117
1883
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