Sphaerephesia longipapillata
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Ordo: Phyllodocida
Familia: Sphaerodoridae
Genus: Sphaerephesia
Name
Sphaerephesia longipapillata (Desbruyères, 1980) comb. n. – Wikispecies link – Pensoft Profile
Type locality
Bay of Biscay, 47°31'N, 9°35'W, 4150 m.
Material examined
Holotype: MNHN TYPE 1283, Bay of Biscay, 47°31'N, 9°35'W, 4150 m.
Diagnosis
Body elongated, almost rounded in cross section, with blunt anterior end. Head appendages smooth, without spurs, median antenna shorter than other appendages. Antenniform papillae not conspicuous. Dorsum with four longitudinal rows macrotubercles in a single transverse row per segment, from segment 2. Macrotubercles large, sessile, spherical. Additional small spherical papillae on dorsum with unclear arrangement due to sediment covering epithelium. Ventrum with small hemispherical papillae. Parapodia digitiform from chaetiger 3, with 7–8 elongated papillae, larger papilla in dorso-distal position. Acicular lobe from segment 2. Ventral cirri digitiform surpassing acicular lobe tip. Approximately 20–25 compound chaetae with long blades (ca. 8–12 times as long as wide), showing slight gradation within fascicles.
Remarks
The holotype has large, turgid, and almost spherical dorsal macrotubercles, but it is covered by a thin layer of sediment that makes the assessment of the number and arrangement of the small epithelial papillae over the dorsal and ventral body surface difficult (therefore Fig. 15E and F not necessarily accurate). A feature not highlighted in the original description is the number of chaetae, that can reach up to 30 in some mid-body fascicles, all with relatively long blades, measuring 8–12 times as long as wide. Sphaerephesialongipapillata comb. n. is distinguished from other congeners in the combination of three features: elongated and almost cylindrical body, presence of large (occupying most of the dorsum surface) and spherical macrotubercles, not pear-shaped (Fig. 15E) and chaetae with medium-long blades (ca.ten times longer than wide). The parapodia and parapodial papillae in the holotype are stretched, but it could be due to muscular relaxation of this particular specimen. The sigmoid acicula could not be verified in the opaque specimen. Two other NE Atlantic Sphaerephesia species with similar body shape and chaetae are S.philippi comb. n. and S.artabrensis comb. n., but both present pear-shaped macrotubercles in at least posterior chaetigers. Moreover, S.artabrensis comb. n. has less parapodial papillae (3–4 on each parapodium). Sphaerephesialongipapillata comb. n. was also characterised by the length of a dorso-distal parapodial papilla, a feature that could vary after fixation (Helm and Capa 2015[1]). However, the dorso-distal papilla is longer than the others in the material examined, and could be a distinct diagnostic feature together with the high number of chaetae per fascicle.
Distribution
Only known from type locality.
Habitat
No details were provided in the original description.
Taxon Treatment
- Capa, M; Nygren, A; Parapar, J; Bakken, T; Meißner, K; Moreira, J; 2019: Systematic re-structure and new species of Sphaerodoridae (Annelida) after morphological revision and molecular phylogenetic analyses of the North East Atlantic fauna ZooKeys, 845: 1-97. doi
Images
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Other References
- ↑ Helm C, Capa M (2015) Comparative analyses of morphological characters in Sphaerodoridae and allies (Annelida) revealed by an integrative microscopical approach. Frontiers in Marine Science 1: 82. https://doi.org/10.3389/fmars.2014.00082
