Spirotropis guancha Ortega & Gofas 2019
- Dataset
- The unknown bathyal of the Canaries: new species and new records of deep-sea Mollusca
- Rank
- SPECIES
- Published in
- Ortega, José Rafael, Gofas, Serge (2019): The unknown bathyal of the Canaries: new species and new records of deep-sea Mollusca. Zoosystema 41 (26): 513-551, DOI: 10.5252/zoosystema2019v41a26
Classification
- kingdom
- Animalia
- phylum
- Mollusca
- class
- Gastropoda
- order
- Neogastropoda
- family
- Drilliidae
- genus
- Spirotropis
- species
- Spirotropis guancha
description
DESCRIPTION Shell medium-sized, biconical with a tall and turreted spire, and the last whorl a little more than half of the total height. Protoconch of 1.5 whorls, globose, with the last half-whorl ornamented by a few flexuous incremental lines, separated from the teleoconch by an indistinct line. Teleoconch of about 7 regularly increasing whorls; teleoconch whorls distinctly shouldered, with a distinct subsutural rim, then a concave subsutural ramp between this and the shoulder. Shoulder bearing a series of axially elongate knobs (about 15 on penultimate whorl, becoming attenuated on the last whorl where approaching the outer lip). Labial notch well developed and deep, situated at the termination of the subsutural ramp, as is usual in the genus. Siphonal canal short and wide. Colour opaque white, without gloss. Dimensions of holotype, 16.2 mm height × 6.4 mm diameter, of paratypes, 10.7 × 4.3 to 20.1 × 7.6 mm.
description
urn: lsid: zoobank. org: act: 3 CA 92 AAD- 586 D- 47 F 5 - 9 AD 7 - D 00450 C 50 F 6 E
discussion
REMARKS Spirotropis guancha n. sp. most resembles S. centimata (Dall, 1889), originally described from SE United States and subsequently reported from the Azores and from off western Morocco (Bouchet & Warén 1980). Spirotropis guancha n. sp. has a globose and smooth, whitish, paucispiral protoconch denoting non-planktotrophic development whereas S. centimata has a conical, yellowish protoconch of c. 2.5 whorls, with a suprasutural keel, denoting a planktotrophic development. The thick subsutural rim of S. guancha n. sp. is not seen in S. centimata, which also has much more prominent knobs along the shoulder. The aperture of S. guancha n. sp. is wider, the siphonal canal is shorter and broader than in S. centimata. We figure for comparison (Fig. 20 A-C) a specimen of the latter species collected off SW Morocco by R / V Talisman.
distribution
TYPE LOCALITY. — Off NW Gran Canaria, 28 ° 08.26 ’ N, 15 ° 51.99 ’ W / 28 ° 08.47 ’ N, 15 ° 51.66 ’ W, 470 - 485 m.
etymology
ETYMOLOGY. — An adjective derived from the name of the aboriginal people of Canary Islands, the Guanches.
materials_examined
TYPE MATERIAL. — Holotype. spm., MNHN-IM- 2000 - 34271 and 1 paratype (sh.) from SEAMOUNT 2 DW 128. Paratypes. 1 sh., MNHN-IM- 2000 - 34272 from DW 126. — 1 spm., MNHN-IM- 2000 - 34273 from DW 130.