Travisia zieglerae

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Taxonavigation

Ordo: Capitellida
Familia: Capitellidae
Genus: Travisia

Name

Travisia zieglerae Wiklund & Neal & Glover & Drennan & Muriel Rabone & Dahlgren, 2019 sp. nov. – Wikispecies link – ZooBank link – Pensoft Profile

Material examined

Type locality

Pacific Ocean, CCZ, 12°27.26’N 116°36.77’W, depth 4137 m, in mud between polymetallic nodules.

Additional material examined

Travisia glandulosa McIntosh, 1879, holotype BMNH 1921.5.1.2431 and specimen of Monro (1930)^[1], Travisia gravieri McIntosh, 1908, holotype BMNH 1921.5.1.2429.

Description

This species is represented by 21 specimens. It is a small species 1.2–7.5 mm long and 0.25–0.8 mm wide for 21–24 segments, 19 or 20 of which chaetigerous and 2–4 posterior-most achaetigerous. Preserved specimens pale yellow (Fig. 29A), live specimens translucent (Fig. 29B) Holotype in good condition, 6 mm long and 0.8 mm wide (at the widest point). Body robust, compact, grub like, anteriorly (commonly on chaetigers 1–7) somewhat enlarged then tapering posteriorly and relatively slender. Body surface rugose, with transverse rows of small squarish lobes.
Prostomium short, smooth, conical (Fig. 29C). Peristomium trapezoidal, rugose, with squarish papillae larger and then in subsequent segments, two transverse rows observed using Shirlastain A (Fig. 29C). Mouth as a broad transverse slit extending to chaetiger 1 (Fig. 29D).
Branchiae absent. Parapodia biramous, located on row with largest lobes, both rami well separated (Fig. 29C, E). Parapodial lappets present, observable from chaetiger 2 and well developed from chaetiger 8. Chaetigers in anterior (inflated) half distinctly triannulate, with three transverse rows of small, squarish lobes, subsequent segments becoming less distinctly annulated, with the last four achaetigerous segments uniannulate; lobes always largest on the ventral most row. Interramal sense organs present, best observed on stained specimen (Fig. 29E). Chaetae all long, smooth, slender capillaries (Fig. 29F).
Pygidium short, thick (only slightly longer wide), ventrally with keel-like very thick lobe. In distal view (Fig. 29G) with circlet of about 10 smaller, thinner lobes located dorsally to large ventral keel-like lobe.

Shirlastain pattern

Prostomium stains strongly and stain is retained even after one week. Interramal sense organs observed as darkly red stained spots (Fig. 29E).

Morphological variation

Number of segments is slightly variably and appears to be linked to size, with the smallest specimens possessing 21 segments (19 of which chaetigerous), while the largest specimen possessed 24 segments (20 of which chaetigerous). Body shape remains mainly consistent, although some specimens were slightly thinner or thicker. Thick, keel-like ventral lobe on pygidium observed consistently, but the detection of slenderer lobes differs (probably an artefact of preservation) and some occasionally appear inflated (Fig. 29G).

Remarks

Differences between the known Travisia species and the species delineated herein are discussed in the Remarks section for Travisia sp. (NHM_1244), see below.

Genetic data

GenBank MN217470–MN217490 for 16S and MN217512 for 18S. Travisia zieglerae sp. nov. fall within a clade consisting of the other Travisia species in this study as well as other Travisia species on GenBank and the taxon Neolipobranchus sp., a result similar to Martinez et al. (2014), suggesting a paraphyletic genus Travisia (Fig. 32).

Ecology

Found in polymetallic nodule province of the eastern CCZ.

Etymology

Named in honor of Amanda Ziegler, member of the science party of the ABYSSLINE AB02 cruise onboard the RV Thomas G. Thompson.

Original Description

Wiklund, H; Neal, L; Glover, A; Drennan, R; Muriel Rabone, ; Dahlgren, T; 2019: Abyssal fauna of polymetallic nodule exploration areas, eastern Clarion-Clipperton Zone, central Pacific Ocean: Annelida: Capitellidae, Opheliidae, Scalibregmatidae, and Travisiidae ZooKeys, 883: 1-82. doi

Images

Figure 29. Travisia zieglerae sp. nov. A Lab image, whole specimen, pre-stain (holotype [specimen NHM_1431]) B Live images, whole specimens (specimen NHM_1911 [left], specimen NHM_188 [right]) C Lab image, lateral anterior, (holotype, stained, pr = prostomium, pp = parapodial lappets) D Lab image, distal anterior, (holotype, stained, m = mouth) E Lab image, lateral posterior, (holotype, stained, pp = parapodia, io = interramal organs) F Detail of capillary chaeta (paratype NHM_140) G Lab image, pygidium, distal view (left) and lateral view (right), with pygidial features outlined in a fine white line (holotype, stained, vl = ventral lobe). Scale bar: 1 mm (A).

Figure 32. Phylogenetic analysis of Scalibregmatidae and Travisiidae. 50% majority rule tree from the Bayesian analyses using 18S and 16S, with posterior probability values on nodes. Twenty taxa from GenBank were included, and Opheliidae was chosen as outgroup following the annelid phylogeny of Weigert and Bleidorn (2016)^[2].

Other References

↑ Monro C (1930) Polychaete worms.Discovery Reports2: 1–222.
↑ Weigert A, Bleidorn C (2016) Current status of annelid phylogeny. Organisms, Diversity and Evolution 16(2) 345–362. https://doi.org/10.1007/s13127-016-0265-7

[B65-1] Monro C (1930) Polychaete worms.Discovery Reports2: 1–222.

[B97-2] Weigert A, Bleidorn C (2016) Current status of annelid phylogeny. Organisms, Diversity and Evolution 16(2) 345–362. https://doi.org/10.1007/s13127-016-0265-7

[1]

[2]

Travisia zieglerae

Contents

Taxonavigation

Name

Material examined

Type locality

Additional material examined

Description

Shirlastain pattern

Morphological variation

Remarks

Genetic data

Ecology

Etymology

Original Description

Images

Other References

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