Chloeia wangi, Salazar-Vallejo, 2023

Salazar-Vallejo, Sergio I., 2023, Revision of Chloeia Savigny in Lamarck, 1818 (Annelida, Amphinomidae), Zootaxa 5238 (1), pp. 1-134 : 119-120

Chloeia wangi sp. n.

urn:lsid:zoobank.org:act:6814B35A-04BA-4FC6-B6BC-FF053F25AD60

Fig. 57

Type material. Philippines. Holotype ( MNHN IA-TYPE 2055 ), Sta. DR137 (12°03´S, 122°06´E), rectangular dredge, 56 m (52 m in label), 6 Jun. 1985.

Diagnosis. Chloeia with bipinnate branchiae from chaetiger 5, progressively smaller posteriorly, with a white basal spot; anterior prostomial area blackish; anterior eyes 5–6× larger than posterior ones; dorsum pale; notochaetae furcates; neurochaetae furcates.

Description. Holotype (MNHN IA-TYPE 2055) complete, some notochaetae broken, many dorsal cirri lost; body fusiform, truncate anteriorly ( Fig. 57A ), slightly bent ventrally, tapered posteriorly, 9 mm long, 3 mm wide, 20 chaetigers.

Holotype pale; dorsum pale; branchiae pale with a white basal spot; caruncle pale, dorsal cirri pale; chaetae transparent. Venter pale, with a whitish longitudinal midventral band.

Prostomium anteriorly entire; anterior prostomial area blackish, barely separated into two lateral spots ( Fig. 57B, C ). Eyes reddish, anterior eyes 5–6× larger than posterior ones. Median antenna inserted at anterior caruncular margin, twisted, as long as caruncle, about 3× longer than lateral antennae. Lateral antennae bases separate from each other, slightly longer than palps. Mouth ventral on chaetigers 2–3. Pharynx not exposed.

Caruncle pale, bent laterally, trilobed, reaching chaetiger 3. Median ridge plicate, with about 26 vertical folds, concealing right lateral lobe. Lateral lobes narrow, with about 24 vertical folds.

Bipinnate branchiae from chaetiger 5, continued throughout body, parallel throughout dorsum, progressively larger to chaetiger 7, progressively smaller posteriorly. In median segments, branchiae with 7–8 lateral branches.

Parapodia biramous, notopodia with cirriform branchiae along chaetigers 1–4, progressively smaller than dorsal cirri. Dorsal cirri about as long as bipinnate branchiae along median segments, slightly longer in posterior chaetigers. Second ventral cirri with cirrophores slightly larger and cirrostyles about 2× longer than adjacent ones, directed dorsally. Other ventral cirri directed ventrolaterally, as long as one subsequent segment.

Chaetae variably broken, especially notochaetae, most neurochaetae complete. Complete chaetae with distal fragile hoods, often projected distally. Notochaetae furcates, major tines 3–4× longer than minor ones in anterior ( Fig. 57D ), and median chaetigers ( Fig. 57F ); harpoon-chaetae not seen. Neurochaetae furcates, major tines 3× longer than minor ones in anterior chaetigers ( Fig. 57E ), 3–5× longer in median chaetigers ( Fig. 57G ).

Posterior end tapered ( Fig. 57H ); pygidium with anus terminal; anal cirri pale, ovoid, tapered, 2–3 longer than wide.

Live pigmentation. Unknown.

Etymology. The specific epithet is after Dr. Zhi (Albert) Wang, formerly in the Hong Kong Baptist University, and now in the State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China, in recognition of his publications on polychaetes and especially after his joint publication of the last Western Pacific species of Chloeia . The derived name is a noun in the genitive case ( ICZN 1999, Art. 31.1.2).

Remarks. Chloeia wangi sp. n. is being described with a juvenile collected subtidally in The Philippines; it belongs in the group longisetosa because there is no dorsal pigmentation pattern, and its bipinnate branchiae start in chaetiger 5. Further, because harpoon notochaetae are rare in median segments, it resembles C. inermis de Quatrefages, 1866 , redescribed above from New Zealand. These two species differ regarding the size of its median antenna to caruncle, the basal pigmentation of bipinnate branchial stems, and type of notochaetae. Thus, in C. wangi the median antenna is as long as caruncle, branchial stems have a basal white spot, and notochaetae are furcates with major tines 3–4× longer than minor ones, whereas C. inermis has median antenna shorter than caruncle, branchial stems without basal spots, and notochaetae are spurred or aciculars.

Distribution. The Philippines, in sediments at 56 m water depth.

Figures

FIGURE 57. Chloeia wangi sp. n., holotype (MNHN IA-TYPE 2055). A. Dorsal view. B. Anterior region after Shirlastain-A. C. Same, frontal view. D. Chaetiger 4, notochaetal tips. E. Same, neurochaetal tip. F. Chaetiger 13, notochaetal tip. G. Same, neurochaetal tips. H. Posterior region, dorsal view. Scale bars: A, 1.1 mm; B, H, 0.4 mm; C, 0.3 mm; D, 50 μm; E, 80 μm; F, 20 μm; G, 30 μm.