Caecum moorei ( Marincovich, 1973 )

Raines, Bret K., 2020, A Rosetta Stone for eastern Pacific Caecidae (Gastropoda: Caenogastropoda), Zootaxa 4827 (1), pp. 1-146 : 115-118

publication ID

https://doi.org/ 10.11646/zootaxa.4827.1.1

publication LSID

lsid:zoobank.org:pub:2CE528C2-DE07-4155-B37D-BE2C342A3901

DOI

https://doi.org/10.5281/zenodo.4453328

persistent identifier

https://treatment.plazi.org/id/03A3DF49-FF90-FFF4-FF44-FB5FFBAC3992

treatment provided by

Plazi

scientific name

Caecum moorei ( Marincovich, 1973 )
status

 

Caecum moorei ( Marincovich, 1973) View in CoL

Figures 93 View FIGURE 93 A–J, 94A–J, 95A–B, 126E

Fartulum moorei Marincovich, 1973: 30 View in CoL , fig. 64, holotype LACM 1591 About LACM , Iquique , Chile.

Fartulum moorei View in CoL —di Geronimo et al. 1995: 116, fig. 6; Ramírez et al. 2003: 259; Mattano & Zelaya 2013: 170.

Material examined. In addition to the type material the following lots were examined. NHMLAC: LACM 1975 About LACM - 33.10 About LACM , Algarrobo , Valparaiso Prov., Chile, 3–8 m, 3 sh ; LACM 1975 About LACM - 30.14 About LACM , Montemar , Valparaiso Prov., Chile, 3–8 m, 4 sh ; LACM 1975 About LACM - 19.18 About LACM , Antofagasta, Antofagasta Prov., Chile, intertidal to 7 m, 2 sh ; LACM 1975 About LACM - 21.13 About LACM , Antofagasta, Antofagasta Prov., Chile, 8–24 m, 8 sh ; LACM 1975 About LACM - 28.15 About LACM , Los Molles , Aconcagua Prov., Chile, intertidal, 16 sh ; LACM 1975 About LACM - 12.13 About LACM , Iquique , Tarapaca Prov., Chile, intertidal, 30 sh ; LACM 1964 About LACM - 16.26 About LACM , Iquique , Tarapaca Prov., Chile, intertidal, 148 sh ; LACM 1975 About LACM - 46.10 About LACM , Chiloe Island , Los Lagos Prov., Chile, 3–7 m, 24 sh ; LACM 1975 About LACM - 41.11 About LACM , Gulf of Corcovado , Los Lagos Prov., Chile, intertidal, 20 sh ; LACM 1975 About LACM - 43.12 About LACM , Gulf of Corcovado , Los Lagos Prov., Chile, 3–15 m, 45 sh ; LACM 1972 About LACM - 76.22 About LACM , Pucusana , Lima Dept., Peru, intertidal to 7 m, 70 sh ; LACM 1935 About LACM - 156.6 About LACM , Independencia Bay , Ica Dept., Peru, 71 m, 70 sh ; LACM 1970 About LACM - 66.13 About LACM , Iquique , Tarapaca Prov., Chile, intertidal, 40 sh ; LACM 1938 About LACM - 205.5 About LACM , Independencia Bay , Ica Dept., Peru, 16 m, 100+ sh ; LACM 1974 About LACM - 23.7 About LACM , Ancon , Lima Dept., Peru, 2 m, 2 sh ; LACM 1974 About LACM - 21.20 About LACM , Ancon , Lima Dept., Peru, 1–3 m, 9 sh ; LACM 1935 About LACM - 159.3 About LACM , Chincha Islands , Ica Dept., Peru, 63 m, 3 sh ; LACM 1938 About LACM - 211.2 About LACM , South Guanape Island , La Libertad Dept., Peru, 63 m, 10 sh .

Original diagnosis. “Teleoconch cylindrical, slightly tapered posteriorly, broadly curved for its whole length, curvature increasing slightly near aperture. Septum slightly depressed, strongly projecting, basically hemispherical but with broadly pointed dorsal mucro, angled nearly 90° to right.Apertural end circular, somewhat oblique. Surface sculpture lacking. Teleoconch light buff colored, septum white. Dimensions (in mm): total length 1.55, diameter in middle of teleoconch and at aperture 0.38, diameter at posterior end 0.32. Operculum: Circular, light to dark brown, multispiral.” Marincovich (1973: 30).

Description. Protoconch multispiral (about 1.8 whorls), planispiral, smooth ( Fig. 94A View FIGURE 94 ), transition to teleoconch I marked by axial line ( Fig. 94A View FIGURE 94 ). Teleoconch I short, sculptured by axial growth lines ( Fig. 94B View FIGURE 94 ), transition to teleoconch II marked by slight axial incised line ( Fig. 94D View FIGURE 94 ). Teleoconch II about 1.5 times length of teleoconch I, sculptured with numerous axial growth lines ( Fig. 94C View FIGURE 94 ), transition to teleoconch III marked by axial incised line ( Figs. 94D, F View FIGURE 94 ). Teleoconch III sculptured with numerous axial growth lines crossed by thin diffuse striae ( Fig. 94E View FIGURE 94 ), transition to teleoconch IV marked by suture ( Fig. 95A View FIGURE 95 ). Teleoconch IV with identical characters as previous stage ( Fig. 94H View FIGURE 94 ), transition to teleoconch V marked by suture ( Fig. 95A View FIGURE 95 ). Teleoconch V (last growth stage) average size for genus [Tol 2.33–2.56 mm], larger than previous stage, tubular, somewhat thin, moderately and regularly arched [Larc: 0.88–0.97 mm; Arc: 0.24–0.26 mm], subcylindrical, translucent to creamy white with brown mottling ( Figs. 93 View FIGURE 93 A–B, 94J). Surface smooth with traces of longitudinal striae and axial growth lines ( Fig. 94I View FIGURE 94 ). Posterior [Dpe: 0.46–0.53 mm] with thick edge, squared shoulder ( Fig. 94J View FIGURE 94 ). Septum mucronate, slightly inflated ( Fig. 94J View FIGURE 94 ). Mucro heel-like, positioned along dorsal margin, usually covered by septum in adult stage ( Fig. 93C View FIGURE 93 ). Aperture [Da: 0.56– 0.62mm] smooth ( Fig. 94J View FIGURE 94 ). No varix. Lip smooth ( Fig. 93C View FIGURE 93 ). Periostracum thin, textured, brown ( Figs. 93 View FIGURE 93 G–H). Operculum thin, light brown; exterior surface with 5–6 concentric rings ( Figs. 93 View FIGURE 93 D–E). Conceptual reconstruction of growth stages shown in Fig. 95A View FIGURE 95 .

Distribution and Habitat. From Guanape Islands, Peru to south of Puerto Montt, Chile. Intertidal to 71 m. Common on sand and rubble substrates.

Remarks. The type material of Caecum moorei is comprised of eight subadult specimens (LACM 1591, Fig. 93E View FIGURE 93 ). While it does bear similarities to C. dextroversum , fresh C. moorei can be easily distinguished by the shell’s glossy surface and unique periostracum sculpture, which is finer and more sinuous ( Fig. 93F View FIGURE 93 ). The distribution of C. moorei may actually overlap with C. dextroversum near northern Peru. However, no lots examined have contained both species. Mattano & Zelaya (2013) extended the range of C. moorei to 42 o S.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

SubClass

Caenogastropoda

Order

Littorinimorpha

Family

Caecidae

SubFamily

Caecinae

Genus

Caecum

Loc

Caecum moorei ( Marincovich, 1973 )

Raines, Bret K. 2020
2020
Loc

Fartulum moorei

Mattano, N. & Zelaya, D. G. 2013: 170
Ramirez, R. & Paredes, C. & Arenas, J. 2003: 259
Geronimo, I. di & Privitera, S. & Valdovinos, C. 1995: 116
1995
Loc

Fartulum moorei

Marincovich, L. Jr. 1973: 30
1973
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