Caecum iricolor Vannozzi, 2023
- Dataset
- GBIF Backbone Taxonomy
- Rank
- SPECIES
- Published in
- Vannozzi, A. (2023). The Caecidae from BIOMAGLO Expedition in the Mayotte-Glorieuses area (Mollusca, Gastropoda). <em>Zoosystema.</em> 45(12): 421-434.
Classification
- kingdom
- Animalia
- phylum
- Mollusca
- class
- Gastropoda
- order
- Littorinimorpha
- family
- Caecidae
- genus
- Caecum
- species
- Caecum iricolor
description
(Figs 2 E-H; 4 A, B; 5 A, B) urn: lsid: zoobank. org: act: 4 FFA 7 AA 6 - 0863 - 48 AB-ACF 1 - 451 AD 99 D 0347
description
DESCRIPTION Shell of average size for the genus, tubular, smooth, colourless, semitransparent, iridescent. Tube cylindrical, gradually tapering toward the apex. In ventral view, tube appearing slightly dextrally twisted. Surface covered by fine growth lines, sometimes showing shallow wavy longitudinal grooves. Macula absent. Aperture somewhat inclined, preceded by a distinct swelling forming a rounded varix crossed by growth lines, then contracting and ending with a clearly reflected lip. Septum dome shaped without mucro, lying on the cutting plane. Traces of temporary septum visible at the boundary of the septum with the tube. No traces of periostracum detected. Young stages, protoconch, operculum and soft parts unknown. Holotype: length 2.33 mm, max diam 0.44 mm, min diam 0.33 mm.
discussion
REMARKS Caecum iricolor n. sp. is very similar to C. biomaglo n. sp. and may at first sight be confused with it. However, C. iricolor n. sp. is more fragile and is easily distinguished due to the more slender shape of the tube, slightly twisted and more gradually tapering toward the apex, the smaller and more protruding septum and the more gently rounded swelling and more clearly reflected lip. Furthermore, C. biomaglo n. sp. shows a fine longitudinal microsculpture (Fig. 4), while C. iricolor n. sp. has no true microsculpture apart from growth lines and only longitudinal shallow wavy grooves occasionally occur. Caecum iricolor n. sp. is also similar to C. succineum, which however is much smaller and shows several distinct rings in the abapical portion of the tube. Iridescence of the tube is not unique to C. iricolor n. sp. and occurs in several other species of Caecum, all sharing a smooth and colourless tube, e. g., C. glabrum (Montagu, 1803), C. subannulatum de Folin, 1870, C. subcylindratum Pizzini, Raines & Vannozzi, 2013, C. maraisi Vannozzi, Pizzini & Raines, 2015 and C. biomaglo n. sp.
distribution
DISTRIBUTION. — Known only from Mayotte and Banc du Geyser.
distribution
TYPE LOCALITY. — Indian Ocean, Mozambique Channel, W Mayotte, 12 ° 56 ’ S, 44 ° 58 ’ E, 455 - 465 m depth.
etymology
ETYMOLOGY. — Derived from Latin adjective iricolor due to the iridescent appearance of the surface.
materials_examined
OTHER MATERIAL EXAMINED. — Îles Éparses • 1 dd; Mozambique Channel, Banc du Geyser, BIOMAGLO Stn DW 4789; 12 ° 22 ’ S, 46 ° 25 ’ E; 340 - 342 m depth; 22. I. 2017; MNHN. Mayotte • 1 dd (fragm); Mozambique Channel, NW Mayotte, BIOMAGLO Stn DW 4860; 12 ° 31 ’ S, 44 ° 55 ’ E; 486 - 646 m depth; 5. II. 2017; MNHN • 2 dd; Mozambique Channel, S Mayotte, BIOMAGLO Stn DW 4826; 13 ° 05 ’ S, 45 ° 07 ’ E; 489 - 496 m depth; 27. I. 2017; MNHN • 1 dd (fragm); Mozambique Channel, NE Mayotte, BIOMAGLO Stn DW 4871; 12 ° 44 ’ S, 45 ° 19 ’ E; 462 - 486 m depth; 8. II. 2017; MNHN.
materials_examined
TYPE MATERIAL. — Holotype. Mayotte • dd (length 2.33 mm, Figs 2 E-F, 4 A and 5 A); Mozambique Channel, W Mayotte, BIOMAGLO Stn DW 4854; 12 ° 56 ’ S, 44 ° 58 ’ E; 455 - 465 m depth; 4. II. 2017; MNHN-IM- 2000 - 38696. Paratypes. Mayotte • 1 dd; same data as for holotype; MNHN-IM- 2000 - 38697 • 3 dd; Mozambique Channel, NW Mayotte, BIOMAGLO Stn DW 4860; 12 ° 31 ’ S, 44 ° 55 ’ E; 486 - 646 m depth; 5. II. 2017; MNHN-IM- 2000 - 38699.
Name
- Homonyms
- Caecum iricolor Vannozzi, 2023
Bibliographic References
- Vannozzi, A. (2023). The Caecidae from BIOMAGLO Expedition in the Mayotte-Glorieuses area (Mollusca, Gastropoda). <em>Zoosystema.</em> 45(12): 421-434.