Chloeia nuda de Quatrefages, 1866

Salazar-Vallejo, Sergio I., 2023, Revision of Chloeia Savigny in Lamarck, 1818 (Annelida, Amphinomidae), Zootaxa 5238 (1), pp. 1-134 : 90-91

Chloeia nuda de Quatrefages, 1866 indeterminable

Fig. 42

Chloeia nuda de Quatrefages, 1866: 390–391 ; Hartman 1959: 131; Solís-Weiss et al. 2004: S2; Salazar-Vallejo et al. 2014: 11 (list).

Type material. Indonesia. Holotype ( MNHN IA-TYPE 81), Moluccas Islands , Amboina, Expédition d’Urville (probably collected in October 1827 after Dumont d’Urville 1830: 51), Hombron & Jacquinot, coll. (after the label), no further data.

Description. Holotype (MNHN 81 complete, without most appendages and chaetae ( Fig. 42A ). Body blunt at both ends, subcylindrical, slightly wider anteriorly; 50 mm long, 8 mm wide, 33 chaetigers.

Prostomium anteriorly entire ( Fig. 42B, C ). Eyes blackish, small, anterior eyes 2× larger than posterior ones. Median antenna lost, base in anterior caruncular margin, relative length to caruncle or lateral antennae unknown. Lateral antennae bases close to each other, right lateral antenna slightly longer than right palp, both damaged. Mouth ventral on chaetigers 2–3. Pharynx not exposed.

Caruncle damaged, without epidermis, sigmoid, trilobed, tapered posteriorly, tip lost, reaching chaetiger 3. Median ridge eroded, with about 21 vertical folds, partially concealing lateral lobes. Lateral lobes narrow, with about 18 vertical folds.

Bipinnate branchiae from chaetiger 4, continued throughout body, some segments with parallel, others with convergent branchial stems; progressively larger to distal body third, smaller thereafter. Six to seven lateral branches in median segments.

Parapodia biramous, cirriform branchiae lost, presence along anterior chaetigers and relative size to dorsal cirri unknown. Dorsal cirri mostly lost, a few remaining longer than bipinnate branchiae along median chaetigers, apparently as long as branchiae in posterior chaetigers. Second ventral cirri lost; size relation to adjacent cirri and orientation unknown. A few complete ventral cirri directed ventrolaterally, as long as one subsequent segment.

Chaetae almost all broken; some remaining without tips. Chaetal types unknown.

Anus terminal; left anal cirrus on site, digitate, 7–8× longer than wide.

Live pigmentation. Unknown. Preserved specimen pale, chaetae mostly lost, few remaining transparent; body almost completely without pigmentation including prostomium, and dorsal cirri. Dorsum with a thin longitudinal dark line along chaetigers 3–8; venter pale.

Remarks. Because of the almost complete lack of chaetae, de Quatrefages (1866: 391) named this species as naked. The specimen was very damaged; he noted almost all remaining chaetae were broken. Horst (1910: 172) regarded C. nuda as indeterminable; his conclusion is herein confirmed.

Figures

FIGURE 42. Chloeia nuda de Quatrefages, 1866, holotype (MNHN 81), indeterminable. A. Left lateral view. B. Anterior region, dorsal view. C. Same, after Methyl green staining. Scale bars: A, 4.7 mm; B, 1.3 mm; C, 1 mm.