Myzostoma debiae, 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 : 310

Myzostoma debiae n. sp. Summers, Al-Hakim & Rouse

Fig. 4 A–B

Holotype: MZB.Pol. 0 0 127 paragenophore (1 spm: in 70% ethanol after formalin fixation). Kri Eco Jetty, Raja Ampat, Indonesia (0°33'27.42"S, 130°40'36.23"E), less than 20 m. Collected at night using scuba on 26 October 2013 by MMS and GWR.

Host. Comactinia titan Messing ( Comatulidae , Comatulida , Crinoidea). SIO-BIC E6159 ( DNA subsample only). Genbank (COI—KM491778).

Paratypes: SIO-BIC A3794 paragenophores (3 spms: 2—in 70% ethanol after formalin fixation; 1—in 9% ethanol following fixation in DMSO). Same host and locality. Genbank (COI—KM014210).

Etymology. Named for Deborah Summers, mother of MMS.

Diagnosis and description. Holotype body circular, diameter ~ 4 mm following fixation. Body margin with 20 medium-long cirri ( Fig. 4 A–B). Mouth and cloaca on ventral surface. Mouth, cloaca, and 8 lateral organs positioned midway between margin and parapodia, alternating with the latter. Extended proboscis with 9 long, triangular papillae ( Fig. 4 B). Five pairs of parapodia. Paired penes in line with third pair of parapodia. Dorsal color pattern with margin resembling ten white hearts ( Fig. 4 A).

Remarks. Myzostoma debiae n. sp. is distinct in its dorsal color pattern, the margin resembling ten white hearts. It can be further distinguished from other disc-shaped myzostomids by its cirri, which are equal in length, as well as its association with Comactinia titan . Other disc-shaped myzostomids with long cirri show noticeable differences in cirral length, the most anterior and posterior pairs longer than the rest. Paratype SIO-BIC A3794 (fixed in formalin—Figure 4 A–B) has 7 papillae on the proboscis.

Figures

FIGURE 4. (A – B) Live photographs of Myzostoma debiae n. sp. paratype (SIO-BIC A 3794) — (A) dorsal, showing characteristic color and patterning; (B) ventral, extended penises adjacent to third pair of parapodia and extended proboscis with seven papillae. (C) Live photograph of Myzostoma miki n. sp. holotype (SIO-BIC A 3662), dorsal, unique honeycomb pattern shown. (D – G) Myzostoma eeckhauti n. sp. paratypes (SIO-BIC A 3668) — (D) dorsal; (E – G) SEM, (E) ventral, specimen with only three pairs of parapodia—all other types had five pairs; (F) smooth extended proboscis, (G) parapodia with hook. (H – I) Live photograph of Myzostoma hollandi n. sp. holotype SIO-BIC A 3791 — (H) dorsal; (I) ventral, showing six acirrate caudal processes and eight distinctive anterior triangular cirri. (J – K) Live photographs of Myzostoma indocuniculus n. sp. paratypes (SIO-BIC A 3763) — (J) dorsal showing two wide bunny ear-shaped caudal processes; (K) from the side, showing the cirri on the body margin and their relative lengths. Scalebars 2 mm (A-B); 1 mm (C – E, H – K); 100 Μm (F, G).