Thelepus pascua (Fauchald, 1977)

Londoño-Mesa, Mario H., 2009, Terebellidae (Polychaeta: Terebellida) from the Grand Caribbean region 2320, Zootaxa 2320 (1), pp. 1-93 : 83-85

publication ID

https://doi.org/ 10.11646/zootaxa.2320.1.1

DOI

https://doi.org/10.5281/zenodo.5324864

persistent identifier

https://treatment.plazi.org/id/03F75303-AE0C-FFEA-FF7E-FCB73C8E85E5

treatment provided by

Felipe

scientific name

Thelepus pascua (Fauchald, 1977)
status

 

Thelepus pascua (Fauchald, 1977) View in CoL

Figures 25 View FIGURE 25 A-K

Euthelepus pascua, Fauchald, 1977b:57–58 View in CoL , Figs 12 View FIGURE 12 D-H.

Thelepus pascua, Hutchings & Glasby, 1986:114 View in CoL (comb. nov.).

Type material: Holotype: USNM 53093 About USNM (1) Galeta Reef , Panama, 17.III.1972. Coll. K. Fauchald.

Description: Holotype incomplete, 35 segments, 4.5mm long, 0.5mm wide ( Figs 25A, B View FIGURE 25 ). Upper lip short, semicircular. Lower lip short, wide ( Figs 25C,D View FIGURE 25 ). Tentacular membrane short; eyespots absent. No tentacles remaining. Twelve ventral shields; anterior most shields wider and swollen, and decreasing in width. Two single pairs of branchiae on segments 2–3 ( Figs 25E,F View FIGURE 25 ); each branchia with a long, stout filament on each side, as long as 7 thoracic segments. First pair arising more laterally than second pair (second pair incomplete, missing left filament); each branchiae near anterior margin of segments. Nephridial papillae not seen. Notopodial glandular tissue not developed. Notopodia from segment 3; 32 pairs of notopodia; oar-like chaetae on two lengths ( Figs 25 View FIGURE 25 G-I). Pairs of neuropodia small on segment 6, then more visible and distinguishable, but low and flattened. Thoracic uncini ( Figs 25J View FIGURE 25 from Fauchald, 1977b; 25K) with dental formula MF:2–4:4–5:7; PP developed as a heel; PF absent; Oc slightly convex; Cp with three series of accessory teeth decreasing in size; Sr narrow; SrP as square button close to rounded AP; SrA absent; AF absent; Bs strongly curved. Pygidium missing.

Staining pattern: Only ventral shields stain deeply. Other structures do no stain.

Discussion: The holotype is the only specimen known so far. Hutchings and Glasby (1986) transferred the species from Euthelepus to Thelepus because of the lack of lateral lappets. After their revision, they stated that the specimen has 29 segments with notochaetae, which was missing in the original description. Nevertheless, there are 32 segments with notochaetae, with the last ones not easily visible. Further, the holotype includes an anterior fragment, without the abdominal portion; thus, the abdominal neuropodia reported in the original description might belong to a lost abdominal fragment lost. No other species in the genus has been described with a single pair of branchial filaments. On the other hand, chaetae were never drawn in the original and subsequent descriptions. Oar-like chaetae have not been reported in this subfamily. Thus, the number of single branchial filaments and the presence of paleate chaetae confirm the validity of the species.

Type locality: Galeta Reef , Laurencia Zone, Panama, Atlantic Ocean .

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Terebellida

Family

Terebellidae

Genus

Thelepus

Loc

Thelepus pascua (Fauchald, 1977)

Londoño-Mesa, Mario H. 2009
2009
Loc

Thelepus pascua, Hutchings & Glasby, 1986:114

Hutchings, P. A. & Glasby, C. J. 1986: 114
1986
Loc

Euthelepus pascua, Fauchald, 1977b:57–58

Fauchald, K. 1977: 58
1977
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