Caecum sepimentum Folin, 1868

Albano, Paolo G. & Pizzini, Mauro, 2011, Notes on Caecidae (Mollusca: Gastropoda) from southern Mozambique, with the description of a new species, African Invertebrates 52 (1), pp. 1-1 : 6-9

Caecum sepimentum Folin, 1868

Figs 4A, 4B

Caecum sepimentum :)ROLQ Ɨ868: 84, SO. 9,, ¿J. 7.

Caecum sepimentum var. arcuata [sic] Folin, 1879: 809 [no pls].

Caecum septimentum : /LJKWIRRW Ɨ99ƻ: Ɨ, 4±ƽ, ¿JV ƻ, ³>PLVVSHOOLQJ@.

Caecum maculata +DEH, Ɨ 96³: ƻ³6, WH[W‒¿J. ƻ>FRUUHFW VSHOOLQJ WR EH Caecum maculatum ]. Syn. n.

Caecum berberense /DGG, Ɨ97ƻ: ƻƻ±ƻ³, SO. ƽ, ¿JV ƗƗ, Ɨƻ. Syn. n.

Original description:

“ Testa valde elongata, angusta, sat solida, subcylindrica, interdum paulo conica, arcuata, alba, QLWLGD; annulis XX-XXV validis, latis, rotundatis, interdum subacutis cincta, ultimo latiore VXOFDWR; interstitiis subaequalibus FRQFDYLV; aperturam versus parum WXPHVFHQWH; apertura valde contracta, paulo GHFOLYL; septo subplanato, haud extante, vix mamillato, marginibus nullis, operculo?

Long.: 0,0026; diam.: 0,000 4.”

Redescription:

Tube subcylindrical, slightly curved, crossed by 20–25 pronounced rings having subrounded surface with interspaces as large as rings. In many specimens “halving” of the ring can be noticed, usually at base of central rings ( Fig. 4B ). Aperture surrounded by swelling crossed by 4–5 rings that become closer as diameter decreases. This swelling, ZKLFK DW ¿UVW WLJKWHQV, VXEVHTXHQWO\ HQODUJHV IRUPLQJ VPDOO DQG VKDUS HGJH WKDW KHPV aperture, perfectly circular. Longitudinal microsculpture crossing entire tube can be seen on both rings and interspaces; in some specimens it is visible only near septum DQG DSHUWXUH. 6HSWXP GRPH‒VKDSHG DQG JHQHUDOO\ TXLWH ÀDW XQGHU FXWWLQJ SODQH; WUDFHV of temporary septum can often be noticed. Protoconch planispiral, smooth and vitreous, showing small suture that separates it from teleoconch. Operculum corneous, light brown; external surface crossed by 3–4 concentric small rings; internal surface, seen in SUR¿OH, KDV VWDLU‒OLNH VKDSH (³ VWHSV) DQG SUHVHQWV VXQNHQ QXFOHXV. 6KHOO FRORXU ZKLWH, fresh specimens have dark brown periostracum.

Soft parts unknown.

Mean dimensions: length 2.8 mm, min. diameter 0.4 mm; max. diameter 0.7 mm.

Type material examined: C. sepimentum : 23 syntypes from Mauritius and Reunion Islands on the same glass slide at the MNHN ( Kisch 1959) ( Figs 4C, 4D ). Note: Type material of C. sepimentum var. arcuata has not been found.

Type locality: C. sepimentum : Mauritius. C. sepimentum var. arcuata: Flinders Passage , Cape York ( Australia). Material examined: 2 sh. (Loc 2035) (P.G. Albano coll.).

Additional material examined: SOUTH AFRICA: KwaZulu-Natal: 1 sh., Mission Rocks, N of St Lucia (J.P. Marais coll.); 16 spec. + 47 sh., Leadsman Shoal, outer portion - 24–26 m, sorted from stone washings (NMSA E2677); 2 spec., Leadsman Shoal, Raggie Reef, - 8–14 m, a mixed algal and coral reef, 1–2 km N of Leven Point, sorted from stone washings (NMSA E2725); 3 spec. + 9 sh., Leadsman Shoal, outer portion, - 25–28 m (NMSA E6929); 2 spec., Leadsman Shoal, - 15 m, scrapings + broken down coral rubble (NMSA E2273); 1 spec. + 8 sh., Stn. Zb7, off Bokler Point (27°00.5'S: 32°54.7'E), - 50 m, coral rubble, dead Lithothamnion, R.V. Meiring Naudé , 6.vi.1987 (NMSA E1588); 1 sh., Sodwana Bay, Two-Mile Reef, outer edge, sorted from stone washings, - 15–17 m (NMSA D5304); 5 sh., Stn. Za21, SE of Kosi R. Mouth (ƻ6°ƽƽ.ƻ‵6:³ƻ°ƽƽ.Ɵ‵(), ‒ƽƟ P, ¿QH VDQG, GUHGJHG 5.9. 10'3, 8.YL.Ɨ987 (106$ (ƗƽƗ6); Ɨ VSHF. + Ɨ6 VK., between Bhanga Neck and Kosi Bay, Reef off Marker 13 N, c. - 13 m, hand-dredged sand (NMSA S3118); 1 sh., Stn. Zm7, off Cape Vidal (29°07.1'S: 32°36.6'E), - 145 m, medium sand, dredged R.V. NMDP, 10.vi.1988 (106$ (7ƽƽƟ); Ɨ VK., 6WQ. =I8, RII +XOO\ 3RLQW (ƻ7°Ɵ.4‵6±³ƻ°46.4‵6:³ƻ°46.4‵(), ‒4Ɵ P, ¿QH VDQG, GUHGJHG RV NMDP, 5.vi.1987 (NMSA E1658); 4 sh. (worn), Stn Zk2, off Gipsy Hill (27°48.8'S: 32°38.4'E), - 50 m, dredged RV NMDP, 8.vi.1988 (NMSA 4184); 1 sh. (worn), Stn Za19, off Kosi Estuary (26°56.7'S: 32°54.7'E), - 50 m, coarse sand, shells, dredged RV NMDP, 8.vi.1987 (NMSA E1630); 22 sh. (worn), Stn Zo4, off Cape St Lucia (28°31.8'S: 2°26.9'E), - 76–80 m, coarse sand, dredged RV NMDP, 12.vi.1988 (NMSA E5197); 1 spec. + 2 sh., Sodwana Bay, Two Mile Reef, sorted from stone washings, - 10–15 m (NMSA E769); 3 spec., off Kosi Bay, main reef, 1–2 km S of Estuary, sorted from stone washings, - 9–17 m (NMSA D9833); 1 sh., off Kosi Bay, main reef, 1–4 km S of Estuary, - 9–17 m (NMSA D9267); 12 spec. + 19 sh., Kosi Bay, main reef, 1–4 km S of Estuary Mouth, c. - 18 m, underwater pump (NMSA S4252); 2 spec. + 4 sh. (some in alcohol), Kosi Bay, main reef, 1–4 km S of Estuary Mouth, c. - 20 m, underwater pump (NMSA S2526); 12 spec. + 11 sh., Kosi Bay, main reef, 1–4 km S of Estuary Mouth, - 20–22 m, underwater pump (NMSA S2010); 8 spec. + 4 sh., Kosi Bay, main reef, 1–4 km S of Estuary Mouth, - 23–24 m, underwater pump (NMSA S2918); 1 sh., Stn Zn7, SE of Mission Rocks (28°17.5'S: 32°34.2'E), - 100 m, medium sand, dredged RV NMDP 11.vi.1988 (NMSA E5191); 2 sh. (worn), Stn Zk4, NE of Gipsy Hill (27°45.2'S: 32°39.8'E), - 110 m, sponge, stones, dredged RV NMDP, 8.vi.1988 (NMSA E5204); 14 sh., Stn Zb5, off Boteler Point (27°00.0'S: 32°55.2'E), - 70 m, coral rubble, dredged RV NMDP, 6.vi.1987 (NMSA E1566); 2 spec. + 21 sh., Stn Zn1, SE of Mission Rocks (28°17.5'S: 32°32.6'E), - 50 m, old coral rubble, Lithothamnion , dredged RV 10'3, ƗƟ.YL.Ɨ988 (106$ (6ƻƽƻ); ƻ VK.,6WQ =NƗ, RII *LSV\ +LOO (ƻ7°49.7‵6:³ƻ°³8.ƻ‵(), ‒47±ƽƟ P, ¿QH VDQG, dredged RV NMDP, 8.vi.1988 (NMSA E5663); 2 spec. + 1 sh., between Bhanga Neck and Kosi Bay, reef off Marker 13 N, c. - 8 m, underwater pump (NMSA S2738); 2 spec. + 1 sh., Leadsman Shoal, main portion of coral reef, - 7–11 m (NMSA E6774); 14 sh., Stn. Ze2, off Rock Is. (27°17.2'S: 32°48.0'E), - 62 m, sandstone, coral, marine growths, dredged RV NMDP, 5.vi.1987 (NMSA E1542); 1 sh., Stn Zn1, SE of Mission Rocks (28°17.5'S: 32°32.6'E), 50 m, old coral rubble, Lithothamnion , dredged RV NMDP, 10.vi.1988 (NMSA E7493); 46 sh., Stn Zk3, off Gipsy Hill (27°47.4'S: 32°38.9'E), - 65–70 m, broken shell, dredged RV NMDP, 8.YL.Ɨ988 (106$ (ƽ89³); ƻ VK., 6WQ. =N6, RII *LSV\ +LOO (ƻ7°48.9‵6:³ƻ°³8.4‵(), ‒ƽƟ P, ¿QH VDQG,GUHGJHG 59 NMDP, 8.vi.1988 (NMSA E7497); 7 sh., Stn Zl5, NE of Leven Point (27°55.0'S: 32°38.8'E), - 250 m, coarse sand, dredged RV NMDP, 9.vi.1988 (NMSA E5883); 1 sh., Stn Zm9, off Cape Vidal (28°08.3'S: 32°36.9'E), - 200 m, sponge rubble, dredged RV NMDP, 11.vi.1988 (NMSA E5887); 1 sh., off Kosi Bay, main reef, 1–2 km S of Estuary, sorted from stone washings, - 9–17 m (NMSA D9892); 1 spec., Leadsman Shoal, Raggie Reef, mixed algal and coral reef, 1–2 km N of Leven Point, - 8–12 m (NMSA E6814); 4 sh., off Richards %D\, ‒ƽƟ P, ¿QH TXDUW]LWH, %URNHQ 6KHOO, H[&6,5:DWHU 5HVHDUFK (106$ $6ƗƗƻ); Ɨ VK., RII 6RGZDQD %D\, - 50 m, shell grit, ex CSIR Water Research (NMSA A5087); 7 sh., off Kosi Bay, - 50 m, shell grit, ex CSIR, 1975 Water Research (NMSA A4963); 26 sh., off Kosi Bay, - 100 m, ex CSIR Water Research, 1977 (NMSA A5898); 20 sh., off Sodwana Bay, - 100 m, ex CSIR, 1976, (G3) (NMSA A5553); 3 sh., off Kosi Bay, - 50 m, shell grit, ex CSIR Water Research (NMSA A5964); 1 sh., off Durban Bluff, 10 km 130 SE of Cooper Lighthouse, - 210 m, cone dredge, ex CSIR, 1974 (Ecor 5) (NMSA A2993); 7 spec. + 5 sh., Aliwal Shoal, - 9–15 m (NMSA E6165); 5 spec. + 12 sh., Aliwal Shoal, - 16 m, hand dredged sand (NMSA S5943); 1 larval shell cf. sepimentum , South Coast, Landers Reef, off Scottburg Area, - 45 m, scuba, April 1988 (J.P. Marais coll.); 5 spec. + 39 sh., South Coast, Landers Reef, off Scottburg Area, - 33 m, scuba (J.P. Marais coll.); 3 spec. + 135 sh., South Coast, Aliwal Shoal, off Umkomaas Area, - 27 m, scuba (J.P. Marais coll.); 5 spec. + 19 sh., Aliwal Shoal, off Scottburgh, - 25–27 m, sand and reef debris (NMSA S7186); 34 spec. + 55 sh., Aliwal Shoal, off Scottburgh, c. - 14 m, underwater pump (NMSA S8627); 6 spec. + 1 sh., Aliwal Shoal, Cracker Reef, - 23 m (NMSA E7168); 2 spec. + 9 sh., Aliwal Shoal, off Scottburgh, - 10–20 m, sand (NMSA S6822); 7 sh., South Coast, Landers Reef, off Scottburg Area, - 45 m, scuba (J.P. Marais coll.); 3 spec. + 5 sh. (1 juv.), Landers Reef, off Park Rynie, - 30 m, slightly muddy sand (NMSA E1671); 1 sh., Landers Reef, - 20–30 m, sorted from stone washings (NMSA E2317); 7 spec. (1 juv.) + 5 sh., Aliwal Shoal, off Scottburgh, - 10 m, sand and reef debris (NMSA S8247); 3 sh., Park Rynie, - 50 m, coarse sand, 25.ii.1976, ex CSIR Water Research 1977 (NMSA B240); cf. sepimentum 2 sh. (worn), T.O. Strand, 2 km N of Port Edward (NMSA E1664). Eastern Cape: 1 sh., Mzamba, beach drift (NMSA A6285); cf. sepimentum 3 sh., 0]DPED, EHDFKGULIW (106$ '³ƟƻƗ)..(1<$: ³ VK.,.LOL¿, ODJRRQ LQVKRUH RI FRUDO UHHI, VDQG IURP EDVH of coral outcrops, c. - 4 m (NMSA K7997). MAURITIUS: 3 sh., Pointe Radeau, S of Roches Noires, shell debris, near Reef Gap (NMSA K9511); 2 sh., Riambel Lagoon, beach drift (NMSA K9821); 8 sh., Gris Gris, debris on Surf Beach opposite Reef-Break (NMSA K9186). RÉUNION: 10 spec. + 3 sh., Cap La Houssaye, dived - 8–17 m, varied bottom (NMSA K5444); 46 spec. + 25 sh., Cap La Houssaye, - 6– 12 m.

Comparative material examined:

C. vertebrale Hedley, 1899 holotype AMS C5917. Type locality: Funafuti Atoll, Ellice Group, in the sandy shore of the lagoon ( Fig. 4H ).

C. maculatum Habe, 1963 holotype NMNS. Type locality: Ankyaba , Kakeroma-jima, near Amami-Oshima Islands, Japan ( Fig. 4G ).

C. berberense Ladd, 1972 holotype, lot 650429 at USNM. Type locality: drill hole E-1, Eniwetok ( Marshall Islands), depth 1,260–1,270 ft [384.1–387.1 m], Early Miocene ( Figs 4E, 4F ).

Figures

Fig. 4. (A, B) Caecum sepimentum Folin, 1868, adult, Inhaca I. (Loc. 2035): (A) shell, scale bar 1 mm; (%) ULQJV VFXOSWXUH, VFDOH EDU ƗƟƟ ȝP; (&, ') V\QW\SH DW 01+1: (&) VKHOO, VFDOH EDU Ɨ PP; (') ULQJV VFXOSWXUH,VFDOH EDU ƗƟƟ ȝP; ((, )) Caecum berberense Ladd, 1972, holotype at USNM: (()VKHOO,VFDOH EDUƗ PP; ()) ULQJV VFXOSWXUH,VFDOHEDU ƗƟƟ ȝP; (*) Caecum maculata Habe,1963, holotype at NMNS; (H) Caecum vertebrale Hedley, 1899, holotype at AMS, scale bar 1 mm.