Brusa F et al. (2017), Two new species of Syndesmis (Platyhelminthes, ...

ECB-ART-45403

Int J Parasitol Parasites Wildl 2017 Mar 01;62:54-58. doi: 10.1016/j.ijppaw.2017.03.002.

Show Gene links Show Anatomy links

Two new species of Syndesmis (Platyhelminthes, Rhabdocoela, Umagillidae) from the sea urchin Pseudechinus magellanicus (Echinodermata, Echinoidea) in the Southwestern Atlantic Ocean.

Brusa F , Montes MM , Marcotegui P , Martorelli SR .

???displayArticle.abstract???
In this paper, we describe two new species of Syndesmis living in Pseudechinus magellanicus in the Southwest Atlantic Ocean. The new species have a long stylet in the male reproductive system, which is different from that of the known species of the genus. Specimens of Syndesmis selknami n. sp. have a ∼220-μm-long stylet (∼1/3 of the body length, 0.69 mm). This ratio is unique because only four species (Syndesmis echinorum, Syndesmis rubida, Syndesmis inconspicua and Syndesmis echiniacuti) have similar stylet lengths but are larger in body sizes (3-5 mm). Specimens of Syndesmis aonikenki n. sp. have a ∼148-μm-long stylet (∼1/10 of the body length, 1.11 mm). Syndesmis pallida has a similar ratio but the uterus is located posteriorly, and the filament glands are very small and located in the posterior region of the body. These are the first flatworms reported parasitizing Pseudechinus magellanicus.

???displayArticle.pubmedLink??? 28377883
???displayArticle.pmcLink??? PMC5369334
???displayArticle.link??? Int J Parasitol Parasites Wildl

Species referenced: Echinodermata
Genes referenced: LOC100887844

???attribute.lit??? ???displayArticles.show???

References [+] :

Brusa, A new Paravortex (Platyhelminthes, Dalyellioida) endoparasite of Mesodesma mactroides (Bivalvia, Mesodesmatidae) from Uruguay. 2006, Pubmed


	Fig. 1. Schematic reconstruction of Syndesmis selknami n. sp. in dorso-ventral view. Abbreviations: eg, egg; f, filament; fg, filament glands; ov, ovary; st, stylet; t, testes; vit, vitellaria.
	Fig. 2. Syndesmis selknami n. sp. A, D, whole mount preparations. B, C, E, F, sagittal sections of the body. Abbreviations: b, brain; ed, ejaculatory duct; eg, egg; f, filament; fg, filament glands; i, intestine; ov, ovary; sp, sensory pit; sr, seminal receptacle; t, testes; u, uterus; vc, vacuolar cells; vit, vitellaria. The white arrow heads marks the proximal part of the stylet and black arrow heads mark the distal part.
	Fig. 3. Schematic reconstruction of Syndesmis aonikenki n. sp. in dorso-ventral view. Abbreviations: eg, egg; f, filament; fg, filament glands; ov, ovary; st, stylet; t, testes; vit, vitellaria.
	Fig. 4. Syndesmis aonikenki n. sp. A, B, whole mount preparations. C, sagittal section of the body. Abbreviations: ed, ejaculatory duct; eg, egg; f, filament; fg, filament glands; i, intestine; ma, male atrium; ov, ovary; sr, seminal receptacle; st, stylet; u, uterus; va, vagina; vit, vitellaria.