Melanella sarissa ( 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 : 474-476

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.4542997

persistent identifier

https://treatment.plazi.org/id/03E687A2-FFA9-FFC7-FF5F-825EFD7442F1

treatment provided by

Plazi

scientific name

Melanella sarissa ( Watson, 1883 )
status

 

Melanella sarissa ( Watson, 1883)

( Figure 12 View FIGURE 12 A–L)

Eulima sarissa Watson, 1883: 119–120 .

Eulima sarissa: Watson (1886 : plate 37, figure 6a–b).

Melanella cinca Dall, 1927: 65 . syn. nov.

Melanella sarissa : Lange-de-Morretes (1949: 83); Rios (1994: 104, plate 34, figure 430 [reproduced from original illustration]); Rios (2009: 192, figure 471 [reproduced from original illustration]).

Type material. Holotype NHMUK 1887.2 View Materials .9.1599 ( Figure 12 View FIGURE 12 A–B). Melanella cinca Dall, 1927 : Syntype USNM 108028 View Materials ( Figure 12D View FIGURE 12 ), USFC stn. 2668, off Georgia, USA .

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

Material examined. Type material; USA: USFC stn. 2668: USNM 108036 View Materials b [4 dd], USNM 108036 View Materials h [2 dd]; USFC stn. 2415 (30°44′N 79°26′W, 805 m), coll. 01/iv/1885: USNM 108379 View Materials b [1 dd] GoogleMaps . Puerto Rico: North of Culebra Island, off St. Thomas , Challenger stn. 24: NMW 1955.158 View Materials .26254 [1 dd] ; Brazil: Pernambuco: Challenger stn. 120 (08°37′S 34°28′W, 1234 m), coll. 09/ ix/1873: NMW 1955.158 View Materials .00652 [3 dd]; GoogleMaps Rio de Janeiro state, continental slope of Campos Basin: Oceanprof I stn. 44: IBUFRJ 19708 † [1 dd]; (22°22′37″S 40°06′28″W, 650 m), coll. RV Gyre, 22–24/viii/2009: MNRJ 28845 View Materials † [1 dd] GoogleMaps .

Measurements. Holotype NHMUK 1887.2.9.1599, 10 whorls, SL= 4.0 mm; BWL= 1.7 mm; AL= 1.1 mm; SW= 1.2 mm; AW= 0.7 mm. NMW 1955.158.26254, 10 whorls, SL= 4.0 mm; BWL= 1.8 mm; AL= 1.2 mm; SW= 1.2 mm; AW= 0.7 mm. MNRJ 28845, 10 whorls, SL= 3.8 mm; BWL= 1.8 mm; AL= 1.0 mm; SW= 1.2 mm; AW= 0.6 mm. IBUFRJ 19708, 9 whorls, SL= 3.5 mm; BWL= 1.7 mm; AL= 1.1 mm; SW= 1.1 mm; AW= 0.6 mm. Syntype of M. cinca, USNM 108028, 8 whorls, SL= 2.5 mm; BWL= 1.1 mm; AL= 0.7 mm; SW= 0.8 mm; AW= 0.5 mm.

Remarks. Watson (1883) only reported material from Challenger stn. 122 in the original description. A survey in the NMW revealed other specimens of M. sarissa collected from Challenger stn. 24 (NMW 1955.158.26254), in Puerto Rico, and stn. 120 (NMW 1955.158.00652), in Pernambuco, but as they are from different localities, we do not include them in the type series. Thus, the shell of NHMUK 1887.2.9.1599 may be inferred as the holotype by monotypy.

Shell features of Melanella sarissa fits the wide concept of the genus Melanella , however one specimen from MNRJ 28845 ( Figure 12E View FIGURE 12 ) with a well-preserved shell shows brownish spiral bands at the suture of the protoconch. The holotype of M. sarissa is also well-preserved but has no color pattern. Nevertheless, the specimen from MNRJ 28845 ( Figure 12E View FIGURE 12 ) fits perfectly in shape and size with the type of M. sarissa . Species of Melanella are usually glassy and lack brownish bands, but we maintain this classification for now.

This species remained for decades without citations in the literature, Lange-de-Morretes (1949) listed Melanella sarissa in his catalogue of Brazilian mollusks based only on the original description. Rios (1970, 1975, 1985) did not list M. sarissa in his catalogues and included the species only in the most recent editions ( Rios 1994, 2009). Melanella sarissa is rediscovered after more than a century, with new records from the southeast Brazil. Melanella cinca Dall, 1927 ( Figure 12D View FIGURE 12 ), only known from the type locality off Fernandina, Florida, is a junior synonym of M. sarissa . The holotype of M. cinca is a young specimen but has a similar outline of the initial whorls and dimensions ( Figure 12D View FIGURE 12 ), including the protoconch ( Figure 12L View FIGURE 12 ). Besides these features, the aperture is also similar in shape to the specimens of M. sarissa from Brazil. Thus, the geographic distribution of M. sarissa is greatly enlarged, occurring from Florida, USA to Rio de Janeiro, Brazil.

Based on the new material reported here, we can add to the original description that M. sarissa has 4.0 protoconch whorls, with a maximum diameter and height of 340 µm and 470 µm, respectively. Otherwise, the whole shell lacks microscopic sculpture, incremental scars are present and appear at irregular intervals, and the body whorl comprises about 45% of the shell length.

Melanella sarissa resembles M. hians ( Figure 9J View FIGURE 9 ) but differs by the proportionally smaller length (holotype of M. sarissa , ~10 whorls, SL= 4.0 mm vs. syntype of M. hians NHMUK 1887.2.9.1588, 10 whorls, SL= 10.01 mm).

Melanella sarissa has similar dimensions to M. ira Dall, 1927 , from off Georgia and Fernandina, USA, but differs by being more conical and by the larger lateral expansion of the aperture.

Geographical distribution. USA: Georgia ( Dall 1927); Puerto Rico (present study); Brazil: Pernambuco ( Watson 1883) and Rio de Janeiro (present study).

Bathymetric distribution. From 538 m to 806 m.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Caenogastropoda

Family

Eulimidae

Genus

Melanella

Loc

Melanella sarissa ( Watson, 1883 )

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

Melanella sarissa

Rios, E. C. 2009: 192
Rios, E. C. 1994: 104
Lange-de-Morretes, F. 1949: 83
1949
Loc

Melanella cinca

Dall, W. H. 1927: 65
1927
Loc

Eulima sarissa

Watson, R. B. 1883: 120
1883