Caecum sepimentum de Folin, 1868

Vannozzi, Angelo, 2023, The Caecidae from BIOMAGLO Expedition in the Mayotte-Glorieuses area (Mollusca, Gastropoda), Zoosystema 45 (12), pp. 421-434 : 424

publication ID	https://doi.org/10.5252/zoosystema2023v45a12
publication LSID	lsid:zoobank.org:pub:5EB87A24-068B-40F3-B76B-79E4F48C478A
DOI	https://doi.org/10.5281/zenodo.8183518
persistent identifier	https://treatment.plazi.org/id/03A4967B-FFD4-FFDE-B347-FBAAF3FC9527
treatment provided by	Felipe (2023-07-24 11:53:16, last updated 2024-11-26 22:09:11)
scientific name	Caecum sepimentum de Folin, 1868
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Caecum sepimentum de Folin, 1868 View in CoL

( Fig. 2 View FIG A-C)

Caecum sepimentum de Folin, 1868: 84 View in CoL , pl. 6, fig. 7. — Vannozzi 2019b: 73, fig. 7E and synonymy therein.

† Caecum afrum Selli, 1974: 308 View in CoL , pl. 16, figs 11-13.

TYPE MATERIAL. — Lectotype. Mauritius • dd; Mauritius ; MNHN-IM-2000-24907 selected by Pizzini et al. (2013: 5, fig. 8D).

Paralectotypes. Mauritius • 20 dd; same data as for lectotype; MNHN-IM-2000-24908 .

TYPE LOCALITY. — Indian Ocean , Mauritius.

MATERIAL EXAMINED — Îles Éparses • 5 Dd; Mozambique Channel, Banc Du Geyser, Biomaglo Stn Dw 4789; 12°22’S, 46°25’E; 340-342 m depth; 22.I.2017; MNHN GoogleMaps • 5 dd worn; Mozambique Channel, Glorieuses, BIOMAGLO Stn DW 4800; 11°27’S, 47°19’E; 240-255 m depth; 24.I.2017; MNHN GoogleMaps • 14 dd (1 juv) worn; Mozambique Channel, Glorieuses, BIOMAGLO Stn DW 4801; 11°27’S, 47°19’E; 385-410 m depth; 24.I.2017; MNHN GoogleMaps • 32 dd (9 juv, 1 growth stage, 2 fragm) mostly worn; Mozambique Channel, Glorieuses, BIOMAGLO Stn DW 4807; 11°30’S, 47°28’E; 97-124 m depth; 25.I.2017; MNHN GoogleMaps • 62 dd (9 juv); Mozambique Channel, Glorieuses, BIOMAGLO Stn DW 4808; 11°30’S, 47°28’E; 219-224 m depth; 25.I.2017; MNHN GoogleMaps • 1 dd; Mozambique Channel, Glorieuses, BIOMAGLO Stn DW 4814; 11°30’S, 47°29’E; 694-733 m depth; 25.I.2017; MNHN GoogleMaps • 3 dd worn; Mozambique Channel, Glorieuses, BIOMAGLO Stn DW 4818; 11°37’S, 47°20’E; 797-816 m depth; 26.I.2017; MNHN GoogleMaps .

Mayotte • 42 dd (1 juv); Mozambique Channel, S Mayotte, BIOMAGLO Stn DW 4820; 13°05’S, 45°06’E; 295-336 m depth; 27.I.2017; MNHN GoogleMaps • 10 dd; Mozambique Channel, S Mayotte, BIOMAGLO Stn DW 4826; 13°05’S, 45°07’E; 489-496 m depth; 27.I.2017; MNHN GoogleMaps • 4 dd; Mozambique Channel, W Mayotte, BIOMAGLO Stn DW 4846; 12°41’S, 44°58’E; 439-502 m depth; 30.I.2017; MNHN GoogleMaps • 11 dd (1 juv); Mozambique Channel, W Mayotte, BIOMAGLO Stn DW 4847; 12°41’S, 44°57’E; 738-763 m depth; 30.I.2017; MNHN GoogleMaps • 16 dd (1 juv); Mozambique Channel, NW Mayotte, BIOMAGLO Stn DW 4848; 12°35’S, 44°55’E; 399- 402 m depth; 30.I.2017; MNHN GoogleMaps • 5 dd mostly worn; Mozambique Channel, SW Mayotte, BIOMAGLO Stn DW 4851; 13°01’S, 44°57’E; 660-664 m depth; 03.II.2017; MNHN GoogleMaps • 5 dd; Mozambique Channel, SW Mayotte, BIOMAGLO Stn DW 4853; 13°00’S, 44°56’E; 665-669 m depth; 03.II.2017; MNHN GoogleMaps • 18 dd (6 juv); Mozambique Channel, W Mayotte, BIOMAGLO Stn DW 4854; 12°56’S, 44°58’E; 455-465 m depth; 04.II.2017; MNHN GoogleMaps • 11 dd (2 juv, 1 growth stage) worn; Mozambique Channel, NW Mayotte, BIOMAGLO Stn DW 4860; 12°31’S, 44°55’E; 486-646 m depth; 05.II.2017; MNHN GoogleMaps • 7 dd worn; Mozambique Channel, SE Mayotte, BIOMAGLO Stn DW 4864; 12°56’S, 45°15’E; 455-487 m depth; 07.II.2017; MNHN GoogleMaps • 20 dd (1 juv) worn; Mozambique Channel, NE Mayotte, BIOMAGLO Stn DW 4871; 12°44’S, 45°19’E; 462- 486 m depth; 08.II.2017; MNHN GoogleMaps .

Comoros • 11 dd (3 juv, 3 fragm); Mozambique Channel, SE Moheli, BIOMAGLO Stn DW 4836; 12°25.2’S, 43°55.9’E; 82-88 m depth; 28.I.2017; MNHN GoogleMaps • 1 dd (juv); Mozambique Channel, SW Moheli, BIOMAGLO Stn DW 4841; 12°23’S, 43°33’E; 154-333 m depth; 29.I.2017; MNHN GoogleMaps • 1 dd (fragm) worn; Mozambique Channel, SW Moheli, BIOMAGLO Stn DW 4842; 12°23’S, 43°33’E; 388- 420 m depth; 29.I.2017; MNHN GoogleMaps • 1 dd; Mozambique Channel, SE Moheli, BIOMAGLO Stn DW 4843; 12°28’S, 43°54’E; 509- 530 m depth; 29.I.2017; MNHN GoogleMaps .

DISTRIBUTION. — Whole Indo-West Pacific. From the east coast of Africa (Red Sea to eastern South Africa) to Maldives, Papua New Guinea, Philippines, Japan, Australia, New Caledonia, French Polynesia, Hawaii ( Hedley 1903; Kay 1979; Lightfoot 1992a; Hasegawa 2000; Albano & Pizzini 2011; Pizzini & Raines 2011; Pizzini et al. 2013; Vannozzi et al. 2015; Vannozzi 2017, 2019b; Blatterer 2019; unpublished data). Allochthonous to the Mediterranean Sea ( Pagli 2009; Ovalis & Mifsud 2014).

DIAGNOSIS. — Shell of average size for the genus. Tube subcylindrical, evenly arched. Sculpture of about 21 strong rings with a somewhat subtriangular profile. Aperture preceded by a swelling, ending with several concentric small rings. Microsculpture of fine longitudinal threads. Septum almost flat without mucro, lying below the cutting plane. Periostracum brownish. Colourless or creamy, often with darker blotches. Juveniles showing a conical and more curved tube. Transition to the adult stage smooth. Protoconch multispiral with about 1.9 whorls. Operculum circular, terraced. Length 2.5 mm.

REMARKS

Caecum sepimentum is by far the commonest caecid in the entire Indo-West Pacific, and represents the vast majority of the caecids collected during the BIOMAGLO Expedition, occurring in almost all stations.

References

ALBANO P. G. & PIZZINI M. 2011. - Notes on Caecidae (Mollusca: Gastropoda) from southern Mozambique, with the description of a new species. African Invertebrates 52 (1): 1 - 10. https: // doi. org / 10.5733 / afin. 052.0101

BLATTERER H. 2019. - Mollusca of the Dahab region (Gulf of Aqaba, Red Sea). Denisia 43: 1 - 480. https: // www. zobodat. at / pdf / DENISIA _ 0043 _ 0001 - 0480. pdf

FOLIN L. DE 1868. - Les rivages de l'Ile Maurice, in DE FOLIN L. & PERIER L. (eds), Les Fonds de la Mer 1: chap. 17, 82 - 88, pls 6, 9 - 11. https: // www. biodiversitylibrary. org / item / 108784

HASEGAWA K. 2000. - Caecidae, in OKUTANI T. (ed.), Marine Mollusks in Japan. Tokai University Press, Tokyo: 170 - 173.

HEDLEY C. 1903. - Studies on Australian Mollusca. Part 7. Proceedings of the Linnean Society of New South Wales 27: 596 - 619. https: // www. biodiversitylibrary. org / item / 29995

KAY E. A. 1979. - Hawaiian Marine Shells. Reef and shore fauna of Hawaii. Section 4: Mollusca. Bernice P. Bishop Museum Special Publication 64 (4), 653 p. http: // hbs. bishopmuseum. org / pubs-online / pdf / sp 64 - 4. pdf

LIGHTFOOT J. 1992 a. - Hawaiian Caecidae. Hawaiian Shell News 40 (7): 1, 4 - 5. Reprinted in Of Sea & Shore 15 (3): 171 - 173.

OVALIS P. & MIFSUD C. 2014. - On the presence of Caecum sepimentum de Folin, 1868 (Gastropoda: Caecidae) in the Mediterranean Sea. Triton 29: 3, 4.

PAGLI A. 2009. - Untitled, in Forum Natura Mediterraneo. Accessed through: http: // www. naturamediterraneo. com / forum / topic. asp ‰ TOPIC _ ID = 95634 on 2023 - 02 - 26.

PIZZINI M. & RAINES B. 2011. - The Caecidae from French Polynesia with description of eight new species (Caenogastropoda: Rissooidea). Bollettino Malacologico 47 (1): 23 - 46. https: // www. biodiversitylibrary. org / part / 190468

PIZZINI M., RAINES B. & VANNOZZI A. 2013. - The family Caecidae in the South-West Pacific (Gastropoda: Rissooidea). Bollettino Malacologico 49 (suppl. 10): 1 - 78. https: // www. biodiversitylibrary. org / part / 291987

SELLI R. 1974. - Molluschi quaternari di Massaua e di Gibuti, in Missione geologica dell'Azienda Generale Italiana Petroli (A. G. I. P.) nella Dancalia meridionale e sugli altipiani hararini (1936 - 1938). Documentazione Paleontologica, Accademia Nazionale dei Lincei 4 (2): 151 - 444, pls 1 - 30.

VANNOZZI A., PIZZINI M. & RAINES B. 2015. - Revision of South African Caecidae (Mollusca: Gastropoda). African Invertebrates 56 (1): 99 - 136. https: // doi. org / 10.5733 / afin. 056.0109

VANNOZZI A. 2017. - The family Caecidae (Mollusca: Gastropoda) from the Central Philippines. Bollettino Malacologico 53 (2): 121 - 149. https: // www. biodiversitylibrary. org / item / 278548

VANNOZZI A. 2019 b. - The family Caecidae (Mollusca: Gastropoda) from northern Papua-New Guinea. Bollettino Malacologico 55 (1): 72 - 104.

Figures

FIG. 2. — Side and ventral views of Caecum Fleming, 1813 species from BIOMAGLO Expedition: A-C, C. sepimentum de Folin, 1868 from Stn DW4848; A, B, specimens with preserved colour pattern; C, juv.; D, C. succineum de Folin, 1880 from Stn DW4854; E-H, C. iricolor n. sp.; E, F, holotype MNHN- IM-2000-38696, length 2.33 mm; G, H, paratype MNHN-IM-2000-38697 from type locality; I-M, C. biomaglo n. sp.; I, J, holotype MNHN-IM-2000-38700, length 2.46 mm; K, L, paratype MNHN-IM-2000-38701 from type locality; M, paratype from Stn DW4854 MNHN-IM-2000-38702; N, Caecum sp. from Stn DW4847, length 2.4 mm. Scale bar: 1 mm.