Proschizorhynchella caudociliata, Takeda & Kajihara, 2018

Takeda, Naoya & Kajihara, Hiroshi, 2018, A New Genus and Five New Species of Kalyptorhynchia (Platyhelminthes: Rhabdocoela) Discovered in Northern Japan, Species Diversity 23 (1), pp. 1-11 : 4-5

publication ID

https://doi.org/ 10.12782/specdiv.23.1

publication LSID

lsid:zoobank.org:pub:A9B333A2-FD81-476A-A805-D280C2194964

DOI

https://doi.org/10.5281/zenodo.5527056

persistent identifier

https://treatment.plazi.org/id/EF0E025A-25F2-4ECA-9289-03921ED663C7

taxon LSID

lsid:zoobank.org:act:EF0E025A-25F2-4ECA-9289-03921ED663C7

treatment provided by

Felipe

scientific name

Proschizorhynchella caudociliata
status

sp. nov.

Proschizorhynchella caudociliata View in CoL sp. nov.

( Figs 6 View Fig , 7 View Fig ; Table 1 View Table 1 )

Material examined. Holotype: ICHUM 4863 View Materials , adult, whole mount, 42°33′25″N, 141°55′42″E, Mukawa , Hokkaido, Japan, intertidal sand, 20 May 2012 GoogleMaps . Paratypes: ICHUM 4262, 4264, 4265, three adults, whole mounts, same data as holotype.

Description. Living animal body approximately 3.0 mm long and 0.3 mm wide ( Fig. 6 View Fig ). Proboscis 230–270 µm long, 70–80 µm wide ( Fig. 6 View Fig ). Pair of black eyes situated behind proboscis ( Fig. 6 View Fig ). Two testes, each 150–280 µm in diameter ( Fig. 6 View Fig ). Yolk gland 750 µm long, 110 µm wide ( Fig. 6A View Fig ). Two adhesive girdles present; anterior one located at level of posterior end of pharynx, posterior one near caudal end; each girdle composed of six adhesive papillae arranged in regular intervals ( Fig. 6A View Fig ). Pharynx 220 µm long, 150 µm wide ( Fig. 6 View Fig ). Pair of seminal vesicles, each 150–310 µm long, 10–30 µm wide, located posterior to pharynx ( Fig. 6A View Fig ). Male copulatory organ 160 µm long, 50 µm wide ( Fig. 6A View Fig ). Stylet cone shaped, 45 µm long, 12 µm wide, comprised of thin sclerotic sheet rolled up four times ( Figs 6A View Fig , 7 View Fig ). Ovary 120 µm long, 60 µm wide, located posterior to pharynx ( Fig. 6A, B View Fig ). Uterus, 90 µm long, 40 µm wide, located around ovary ( Fig. 6A View Fig ). Common genital pore opening on ventral side of body between two adhesive girdles ( Fig. 6A View Fig ). Bursa 190 µm long, 80 µm wide, located around common genital pore ( Fig. 6A View Fig ). Large oval structure (adhesive gland?) 120 µm long, 100 µm wide, located at the caudal end ( Fig. 6A View Fig ). Caudal end covered with long tactile cilia ( Fig. 6A View Fig ).

Etymology. The specific name refers to the long tactile cilia on the caudal region, which look like a brush.

Remarks. Proschizorhynchella caudociliata can be distinguished from all congeners, except Proschizorhynchella papillata ( Doe, 1974) and P. shibazakii sp. nov., based on the characteristics listed in Table 1 View Table 1 . These three species, however, can be distinguished on the basis of two characteristics: (i) four coils of the copulatory stylet in P. caudociliata and three in P. papillata and P. shibazakii and (ii) a vacuolated region and long tactile hair present near the caudal end in P. caudociliata but absent in P. papillata and P. shibazakii .

ICHUM

Invertebrate Collection of the Hokkaido University Museum

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