Endomyzostoma neridae, Summers, Mindi M., Al-Hakim, Iin Inayat & Rouse, Greg W., 2014

Summers, Mindi M., Al-Hakim, Iin Inayat & Rouse, Greg W., 2014, Turbo-taxonomy: 21 new species of Myzostomida (Annelida), Zootaxa 3873 (4), pp. 301-344 : 305-306

Endomyzostoma neridae n. sp. Summers & Rouse

Fig. 2 F–G

Holotype: AM W.43447 hologenophore (1 spm: ½—in 70% ethanol after formalin fixation; ½—95% ethanol).

Dili, Banda Sea, Timor-Leste (8° 31'15"S, 125°36'46" E). Collected using scuba on 19 September 2012 by Nerida Wilson and GWR. Genbank (COI—KM014169).

Host. Cenometra bella (Hartlaub) ( Colobometridae , Comatulida , Crinoidea). AM J.25425. Genbank (COI—KM491772).

Paratypes: AM P.90322 paragenophore (1 spm: in 70% ethanol after formalin fixation). Collected on same host as holotype.

Etymology. Named for Nerida Wilson, who collected this new species with GWR.

Diagnosis and description. Located in cysts along ambulacral grooves of the host’s arms ( Fig. 2 G). Holotype body folded along anterior-posterior axis, dorsal side inward ( Fig. 2 F). Length ~ 5 mm, width ~ 3–3.5 mm (folded) following fixation. Mouth and cloaca terminal. Five pairs of very small parapodia with noticeable chaetae midway between midline and body margin ( Fig. 2 F). Live color orange, cream in preservative.

Remarks. Endomyzostomum neridae n. sp. is the first Endomyzostoma described from a crinoid host belonging to Mariametroidea. Remscheid (1918) recorded Endomyzostoma cysticolum ( Graff, 1883) from a mariametroid, likely Amphimetra tesselata (AH Clark, 1911) in the Aru Islands ( Indonesia). The drawing of the gall and specimen cannot be distinguished from E. neridae n. sp. and may represent an earlier record. Endomyzostoma cysticolum was originally described from Cape Frio, Brazil, associated with Comactinia meridionalis , a member of Comatulidae . See discussion above regarding other Endomyzostoma .

Figures

FIGURE 2. (A – E) Live photographs of Endomyzostoma scotia n. sp. — (A, B) SIO-BIC A 3876 (non-types) on host Promachocrinus kerguelensis; cysts on centrodorsal (A) and arm, cyst cut open to show animal (B); (C – E) non-types (SIO-BIC A 3224, A 3876, A 3912) removed from cysts, ventral, arrow shows mouth, roman numerals indicate parapodia. (F – G) Live photographs of Endomyzostoma neridae n. sp. holotype (AM W. 43447) and paratype (AM P. 90322) — (F) removed from cyst, roman numerals indicate parapodia; (G) within cyst on host’s arm. (H – L) Mesomyzostoma lanterbecqae n. sp. — (H – J) Live photographs: (H, I) non-type (SIO-BIC A 3650) and paratype (SIO-BIC A 3652) within host’s coelom, arrowhead shows myzostomid in (I), (J) non-type (SIO-BIC A 3649) dissected; (K – L) SEM of non-type (SIO-BIC A 3648), (K) whole animal, (L) hook and reduced parapodia. Scalebars 5 mm (B); 1 mm (C – J); 0.5 mm (K); 10 µm (L).