Marshallora ostenta Rolán & Fernández-Garcés, 2008: 94
Marshallora ostenta
Lee 2009: 89
Unraveling one of the ‘ Big Five’: update of the taxonomy of Triphoridae (Gastropoda, Triphoroidea) from Brazil
Fernandes, Maurício Romulo
Pimenta, Alexandre Dias
European Journal of Taxonomy
2020
2020-06-12
665
665
1
170
6R5RP
Rolan & Fernandez-Garces, 2008
Rolan & Fernandez-Garces
2008
[470,1118,510,537]
Gastropoda
Triphoridae
Marshallora
Animalia
19
20
Mollusca
species
ostenta
Figs 7–8, 23L, 54, 83
Marshallora ostenta Rolán & Fernández-Garcés, 2008: 94, figs 7A–N, 8E–F. Marshallora ostenta– Lee 2009: 89.
Material examined Holotype CUBA• Cienfuegos Bay; MNCN 15.05/47055. Paratypes See Rolán & Fernández-Garcés (2008). Other material BRAZIL– North Brazil• 11 specs; REVIZEE-Norte III st. 176; UFMA* • 1 spec.; REVIZEE-Norte III st. 192; UFMA*. – Amapá• 1 spec.; 03º58′43″ N, 49º33′24″ W; 2001; MNRJ 32570* • 1 spec.; AMASSEDS st. 4134; MORG 43335• 1 spec.; AMASSEDS st. 3210; MNRJ 33801*. – Rio Grande do Norte• 1 spec.; BPot 1-MR31; MNRJ 31536* • 1 spec.; BPot 1-MR41; MNRJ 31538* • 1 spec.; BPot 2-MR32; MNRJ 31657* • 2 specs; BPot 2-MR41; MNRJ 31540* • 1 spec.; BPot 2-MR45; MNRJ 31541*. – Sergipe• 1 spec.; Petro/UFS st. E5-A1; with soft part preservation; UFS• 1 spec.; Petro/UFS st. 15.3; UFS• 1 spec.; Petro/UFS st. 18.1; UFS. – Bahia• 4 specs; Baía de Todos os Santos; May 1997; MNRJ 34430* • 1 spec.; Parcel Paredes, Alcobaça; depth 0–3 m; 8 Jan. 2000; P.J. Souzaand E. Gonçalvesleg.; MZSP 56305*. – Espírito Santo• 1 spec.; REVIZEE-Central C1-VV24; MORG 40378• 2 specs; REVIZEE-Central C1-VV24; MORG 52253• 3 specs; REVIZEE-Central C1-VV31; IBUFRJ 19484• 1 spec.; REVIZEE-Central C1-C65; MORG 39090* • 1 spec.; 19º25′08″ S, 39º15′59″ W; depth 46 m; Oct. 2003; MNRJ 31169* • 1 spec.; 19º25′37″ S, 39º22′22″ W; depth 43 m; Oct. 2003; MNRJ 30750* • 1 spec.; REVIZEE-Central C1-VV38; IBUFRJ 19614• 1 spec.; REVIZEE- Central C6-R2#1-1; IBUFRJ 19506• 1 spec.; 20º14′ S, 40º12′ W; Jun. 2008; MNRJ 32659* • 1 spec.; 20º42′00″ S, 40º24′28″ W, Ilha Escalvada; depth 10–15 m; Jan. 2013; W. Vieiraleg.; MNRJ 34026* • 2 specs; 20º42′ S, 40º06′ W; depth 43 m; 27 Aug. 1979; IBUFRJ 19551• 6 specs; 20º47′ S, 40º34′ W; Nov. 2007; MNRJ 32412* • 1 spec.; 20º47′ S, 40º34′ W; Sep. 2007– Oct. 2008; MNRJ 17227* • 1 spec.; 20º47′ S, 40º34′ W; Sep. 2007– Oct. 2008; MNRJ 30838* • 1 spec.; 20º47′ S, 40º34′ W; Sep. 2007– Oct. 2008; MNRJ 31017* • 1 spec.; 20º47′ S, 40º34′ W; Sep. 2007– Oct. 2008; MNRJ 31029* • 1 spec.; 20º47′ S, 40º34′ W; Sep. 2007– Oct. 2008; MNRJ 31139* • 1 spec.; 20º47′ S, 40º34′ W; Mar. 2010; MNRJ 31047* • 2spec; 20º47′ S, 40º34′ W; Mar. 2010; MNRJ 31087* • 1 spec.; 20º47′ S, 40º34′ W; Mar. 2010; MNRJ 31092* – Rio de Janeiro• 2 specs; HAB 13-H2; MNRJ 18588* • 1 spec.; HAB 16- G1; MNRJ 18623* • 1 spec.; REVIZEE-Central C1-D1-2; IBUFRJ 19532• 1 spec.; REVIZEE-Central C1-D3; IBUFRJ 12881. UNITED STATES OF AMERICA– Georgia• 1 spec.; 30º54′18″ N, 80º36′12″ W; depth 35 m; 4 Sep. 1980; R/V Bagbyleg.; with soft part preservation; USNM 848771.
Description Shell sinistral, elongated, cyrtoconoid to slightly ovoid, moderately convex profile, up to 4.4 mmlong, 1.4 mmwide, length/width ratio 2.4 to 3.4. Protoconch multispiral, conical, 0.47–0.55 mmlong, 0.40– 0.45 mmwide, 4.75–5.25 convex whorls; embryonic shell dome-shaped, covered by small granules in its abapical portion; larval shell with two spiral cords strengthening through first whorl, soon becoming distinct, but adapical one disappears about one whorl after its emergence or as late as at last whorl; adapical cord can be much weaker than abapical one; cords respectively situated at ~39% and 60%–69% of penultimate whorl height; ~27 nearly rectilinear to slightly sigmoid axial ribs. Teleoconch with up to nine whorls; two spiral cords (adapical and abapical) at beginning, abapical one continuous to that of protoconch; median spiral cord emerges in fourth or fifth whorl (rarely in sixth whorl), reaching same size as other cords after 0.5 to 1.5 whorl; on body whorl, spiral cords are 0.9–1.5 × as wide as distance between them; 20–23 nearly orthocline axial ribs at fifth whorl; rounded nodules, with moderately large to medium size; suture distinct, well developed, with small sutural cord; slightly wavy to nearly smooth subperipheral cord, two smooth basal cords; no supranumerical cords; ovate aperture, 0.58–0.79 mmlong, 0.45–0.61 mmwide, length/width ratio 1.2–1.3; anterior canal short, open or partly closed by the projection of outer lip, 0.18–0.31 mmlong, 0.17–0.25 mmwide, length/width ratio 0.9–1.4; posterior canal as small sinus, 0.07–0.12 mmlong. Protoconch light-brown to golden, embryonic shell whitish; teleoconch with faint cream to light brown background, one or two initial whorls often slightly clearer or even white.
Remarks Rolán & Fernández-Garcés (2008)hesitated about the taxonomic integrity of M. ostenta, which may constitute a species with a considerable conchological variation or more than one species. They warned for the chromatic variation, the emergence of the median spiral cord of the teleoconch, and the number of whorls and spiral cords of the protoconch. Differences in the size and shape of adult shells ( Fig. 7) also occur. Agreeing with the previous authors, an in-depth analysis of anatomy and DNA may solve this taxonomical problem. Meanwhile, shells from Brazilare allocated under this name. The shell illustrated by Garcia & Lee (2011)as M. ostentafrom Louisiana(southern USA) is dark and with a much rectilinear profile, not being recognized as belonging to this species. Shells from Brazilhardly ever show a slightly different coloration in the adapical spiral cord (somewhat darker or clearer) in relation to the remaining teleoconch ( Fig. 7F–S), as sometimes observed in shells from the typematerial. Shells of Marshallora modesta(C.B. Adams, 1850)and Marshallora nigrocincta(C.B. Adams, 1839)are darker than those of M. ostenta, never acquiring a white coloration in the initial whorls of the teleoconch ( Rolán & Fernández-Garcés 2008). In addition, M. ostentais found in a wider bathymetric range than the two former species, which are mainly restricted to the littoral zone. Geographical records USA: Georgia(this study), Florida ( Rolán & Fernández-Garcés 2008; Lee 2009); Cuba( typelocality); Brazil: Amapá, Rio Grande do Norte, Sergipeto Rio de Janeiro(this study). Bathymetric distribution Depth: 3–92 m(this study).
2636392544
[189,748,834,861]
MNCN
Cuba
Cienfuegos Bay
19
20
MNCN 15.05/47055.
1
Cienfuegos Bay
holotype
2636392821
[189,653,939,965]
19
20
1
2636393255
[189,1061,1043,1070]
UFMA
Brazil
North Brazil
19
20
11
North Brazil
2636393412
Brazil
Amapa
19
20
1
Amapa
2636393540
[589,1266,1079,1107]
MNRJ
Brazil
3.9786112
21
-49.556667
19
20
MNRJ 32570
1
North Brazil
2636392608
MORG
Brazil
19
20
MORG 43335
1
North Brazil
2636393028
MNRJ
Brazil
Rio Grande do Norte
19
20
MNRJ 33801
1
Rio Grande do Norte
2636393306
[329,779,1154,1181]
MNRJ
Brazil
19
20
MNRJ 31536
1
North Brazil
2636393462
[818,1267,1154,1181]
MNRJ
Brazil
19
20
MNRJ 31538
1
North Brazil
2636392742
MNRJ
Brazil
19
20
MNRJ 31657
1
North Brazil
2636392413
[595,1066,1192,1219]
MNRJ
Brazil
19
20
MNRJ 31540
2
North Brazil
2636393408
MNRJ
Brazil
Sergipe
19
20
MNRJ 31541
1
Sergipe
2636392810
[528,1279,1229,1256]
Brazil
Petro
19
20
1
North Brazil
2636393399
UFS
Brazil
Petro
19
20
1
North Brazil
2636392814
[521,928,1266,1292]
UFS
Brazil
Petro
19
20
1
North Brazil
2636392935
1997-05
MNRJ
Brazil
Baia de Todos os Santos
Baia de Todos
19
20
MNRJ 34430
4
Bahia
2636393196
2000-01-08
MZSP
P. J. Souza & E. Goncalves
Brazil
2
Alcobaca
Parcel Paredes
19
20
MZSP 56305
1
Espirito Santo
2636392658
MORG
Brazil
19
20
MORG 40378
1
Bahia
2636393011
[394,1039,1377,1404]
MORG
Brazil
19
20
MORG 52253
2
Bahia
2636392719
IBUFRJ
Brazil
19
20
IBUFRJ 19484
3
Bahia
2636392541
[521,1122,1414,1441]
MORG
Brazil
19
20
MORG 39090
1
Bahia
2636392426
2003-10
MNRJ
Brazil
46
-19.418888
21
-39.266388
19
20
MNRJ 31169
1
46
Bahia
2636392317
2003-10
MNRJ
Brazil
43
-19.426945
21
-39.372776
19
20
MNRJ 30750
1
Bahia
2636392441
[516,1146,1488,1515]
IBUFRJ
Brazil
19
20
IBUFRJ 19614
1
Bahia
2636392586
R, IBUFRJ
Brazil
Central
19
20
IBUFRJ 19506
1
Bahia
2636392429
[638,1270,1524,1552]
2008-06
MNRJ
Brazil
-20.233334
1268
-40.2
19
20
MNRJ 32659
1
Bahia
2636392766
2013-01
MNRJ
W. Vieira
Brazil
13
-20.7
Ilha Escalvada
21
-40.40778
19
20
MNRJ 34026
1
Bahia
2636393327
[189,1037,1598,1626]
1979-08-27
IBUFRJ
Brazil
43
-20.7
1266
-40.1
19
20
IBUFRJ 19551
45
43
Bahia
2636392834
2007-11
MNRJ
Brazil
-20.783333
1266
-40.566666
19
20
MNRJ 32412
6
Bahia
2636392600
[522,1274,1635,1663]
2007-09
2008-10
2007-09
MNRJ
Brazil
-20.783333
1266
-40.566666
19
20
MNRJ 17227
1
Bahia
2636392537
2007-09
2008-10
2007-09
MNRJ
Brazil
-20.783333
1266
-40.566666
19
20
MNRJ 30838
1
Bahia
2636393199
2007-09
2008-10
2007-09
MNRJ
Brazil
-20.783333
1266
-40.566666
19
20
MNRJ 31017
1
Bahia
2636392553
[474,1264,1709,1737]
2007-09
2008-10
2007-09
MNRJ
Brazil
-20.783333
1266
-40.566666
19
20
MNRJ 31029
1
Bahia
2636392481
2007-09
2008-10
2007-09
MNRJ
Brazil
-20.783333
1266
-40.566666
19
20
MNRJ 31139
1
Bahia
2636393167
2010-03
MNRJ
Brazil
-20.783333
1266
-40.566666
19
20
MNRJ 31047
1
Bahia
2636392762
[393,1023,1783,1812]
2010-03
MNRJ
Brazil
-20.783333
1266
-40.566666
19
20
MNRJ 31087
2
Bahia
2636393563
2010-03
MNRJ
Brazil
-20.783333
Rio de Janeiro
1266
-40.566666
19
20
MNRJ 31092
1
Rio de Janeiro
2636393367
[734,1156,1822,1849]
HAB, MNRJ
Brazil
19
20
MNRJ 18588
2
Bahia
2636393549
HAB, MNRJ
Brazil
19
20
MNRJ 18623
1
Bahia
2636393422
[438,1058,1859,1886]
IBUFRJ
Brazil
19
20
IBUFRJ 19532
1
Bahia
2636393132
IBUFRJ
Brazil
19
20
IBUFRJ 12881
1
Bahia
2636392487
1980-09-04
R, V
R / V Bagby
United States of America
35
30.904999
Georgia
20
-80.60333
19
20
USNM 848771
1
Georgia