Myzostoma susanae Summers, Al-Hakim & Rouse, 2014, n. sp.
Creators: name: Summers, Mindi M.
name: Al-Hakim, Iin Inayat
name: Rouse, Greg W.
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Myzostomida
Myzostomidae
Myzostoma
Myzostoma susanae

description: Myzostoma susanae n. sp. Summers & Rouse
Fig. 6 J–M
Myzostoma coriaceum (Fig. 1 A; DNA from other specimen)— Lanterbecq et al. (2006)
Holotype: SAM E3879 hologenophore (1 spm: ½—in 70% ethanol after formalin fixation; ½—95% ethanol). Mermaid Cove, Lizard Island Reef, Australia (14°38’51.1” S, 145°27’9.6” E), 6 m. Collected using scuba on 18 November 2001 by GWR. Genbank (COI—KM014200).
Host. Comaster schlegelii (Carpenter) (Comatulidae, Comatulida, Crinoidea). SAM K2025. Genbank (28S—KM491766).
Etymology. Named for Susan Rouse, mother of GWR, in honor of her birthday.
Diagnosis and description. Holotype body circular, ~ 5 mm in diameter following fixation. Body margin with 20 very small, thin cirri (Fig. 6 J–M). Mouth and cloaca on ventral surface, in line with first and last pair of parapodia respectively. Five pairs of parapodia. Lateral organs closer to parapodia than body margin (Fig. 6 L). Live and preserved color bright white.
Remarks. There are five other species with short marginal cirri recorded from feather stars, all of which are large in size (> 3 mm) (Table 1). Myzostoma seymourcollegiorum Rouse & Grygier, 2005 has low parapodial cirri and thicker marginal cirri and is also clearly different from DNA sequence data, though it is closely related to M. susanae n. sp. (Summers & Rouse 2014). Myzostoma seymourcollegiorum is found in southern Australia, associated with Cenolia trichoptera (Müller) and possibly Cenolia glebosus Rowe et al. (Rouse & Grygier 2005), though the latter association has yet to be assessed with DNA sequencing. The other four species with short marginal cirri were all described by Graff and his descriptions were all brief. Myzostoma brevicirrum Graff, 1884a was described from Tonga (31 m depth), collected with Clarkcomanthus comanthipinnus (Gislén). Specimens were up to 5 mm in diameter, transparent yellow-ish in color (one specimen was brown), and with a proboscis with papillae. Myzostoma pallidum Graff, 1877 and Myzostoma triste Graff, 1877 were described from Bohol, Philippines. Myzostoma pallidum was found on three species of crinoids— Comatula solaris and Comanthus parvicirrus (hosts revised in Graff, 1884a). Specimens were ~ 3 mm in diameter and pale grey-brown with a dirtyyellow edge, the drawing showing a proboscis with papillae. Myzostoma triste was recorded from Comanthus parvicirrus (in Graff, 1884a). Material was around 4.5 mm long and 4 mm wide and dark brown in color. Myzostoma coriacium Graff 1884a was described from Port Denison, Australia associated with Colobometra perspinosa (though host identification seems dubious). The diameter of the three specimens were between 2.7 to 9 mm, with the margins bent downwards. The specimens were darkish brown in color. The lateral organs described as located midway between the parapodia and body margin (though the drawing shows them closer to the parapodia). Myzostoma susanae n. sp. is distinguishable from all of these species based on color and host.
description: Published as part of Summers, Mindi M., Al-Hakim, Iin Inayat & Rouse, Greg W., 2014, Turbo-taxonomy: 21 new species of Myzostomida (Annelida), pp. 301-344 in Zootaxa 3873 (4) on pages 319-321, DOI: 10.11646/zootaxa.3873.4.1, http://zenodo.org/record/252208