Spirobranchus manilensis, Sivalingam & Kupriyanova & Quek & Yap & Teo, 2022

Sivalingam, Pavarne Shantti, Kupriyanova, Elena K., Quek, Zheng Bin Randolph, Yap, Nicholas Wei Liang & Teo, Serena Lay Ming, 2022, The nomenclatural and taxonomic status of Pomatoleios kraussii var. manilensis Pillai, 1965, Zootaxa 5200 (4), pp. 396-400 : 397-398

Spirobranchus manilensis sp. nov.

Figs 1–3 ; Table S1

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Synonymy

Pomatoleios kraussii var. manilensis .— Pillai, 1965: 169, Fig. 22H [Manila Bay, Philippines, description] [name unavailable following Code Articles 10.2, 15.2 and 45.6.3, see above].

Pomatoleios kraussii manilensis .— Paxton & Chou, 2000: 229 [South China Sea, list] [name unavailable following Code Article 45.5.1, see above].

Pomatoleios kraussi var. manilensis .—Salazar-Vallejo et al., 2014: 36–37 [Philippine and China seas, list] [name unavailable following Code Articles 10.2, 15.2 and 45.6.3, see above] [Specific epithet misspelt].

Spirobranchus manilensis .— Glasby et al., 2016: 217 [South China Sea, list] [name unavailable following Code Article 45.5.1, see above].

Spirobranchus kraussii var. manilensis .— Simon et al., 2019: 225, 229 [name only, comparative material in taxonomic study] [name unavailable following Code Articles 10.2 and 15.2, see above].

Spirobranchus manilensis .— Sivananthan et al., 2021: 46–51, Figs 6–8, Table 2 [new description] [name unavailable following Code Article 45.5.1, see above].

Type material. Holotype: NHM1965.33.34 , collected from and among farmed oysters in Binakayan , Cavite, Manila Bay, Philippines; Fig. 3 . Paratypes: Nine specimens (6 “de-tubed”; 3 preserved within tubes). NHM1965.33.35 (1 spec.), NHM1965.33.36 (1 spec.), NHM1965.33.37 (1 spec.), NHM1965.33.38 (1 spec.), NHM1965.33.39 (1 spec.), NHM1965.33.40 (1 spec.), NHM1965.33.41 (1 spec.), NHM1965.33.42 (1 spec.), NHM1965.33.43 (1 spec.); all material collected from and among farmed oysters in Binakayan, Cavite, Manila Bay, Philippines.

Diagnosis. Tube white ( Figs 1A–B ), sub-trapezoidal in cross-section ( Figs 1C–D ). Radiolar crown attached to two lobes, with 12–17 radioles arranged in a circle in each lobe. Operculum funnel-shaped. Opercular endplate calcareous, circular, with deep concavity ( Figs 2A–B , Fig. 3C ), except in one specimen with a shallower endplate protruding slightly from opercular ampulla ( Fig. 2C , red arrow) with indistinct, concentric ovoid-shaped markings ( Fig. 2D ). Collar chaetae absent, except in one specimen which had collar chaetae on both sides of body. Abdomen with 38–61 chaetigers, between one to three achaetous segments anteriorly.

Etymology. The specific epithet “manilensis” was originally coined by Pillai (1965) in his unavailable varietal name, as a reference to Manila Bay, where the species was found.

Remarks. We refer readers to Sivananthan et al. (2021) for a full description of S. manilensis sp. nov.. The reported count of seven specimens in Sivananthan et al. (2021) excluded three specimens that were preserved within their tubes. Details of holotype and paratypes of S. manilensis sp. nov. are provided in Supplementary Information, Table S1 .

Figures

FIGURE 1. Tube morphology of Spirobranchus manilensis sp. nov. paratypes. A, B—Top view of tubes of paratypes NHM1965.33.40 (A) and NHM1965.33.39 (B); C, D—Sub-trapezoidal cross-sections of tubes of paratypes NHM1965.33.39 (C) and NHM1965.33.43 (D). Scale bars—A–B: 2 mm, C–D: 1 mm.

FIGURE 2. Opercular endplate in paratypes of Spirobranchus manilensis sp. nov.. A, B—Opercular endplate with deeper and broader area of concavity.This structure was observed in majorityof S. manilensis sp. nov. specimens,including NHM1965.33.41 (A) and NHM1965.33.42 (B); C—Side view of operculum of anomalous specimen in type series (NHM1965.33.38), showing slight protrusion of endplate (red arrow); D—Top view of opercular endplate of specimen in C, faintly showing concentric ovoid markings. Scale bars—A–C: 1 mm, D: 0.5 mm.

FIGURE 3. Spirobranchus manilensis sp. nov. holotype (NHM1965.33.34).A—Complete holotype; B—Peduncle of holotype; C—Top view of opercular endplate of holotype, showing deep concavity. Scale bars—A: 2 mm, B: 1 mm, C: 0.5 mm.