Trigonostomum vanmecheleni Artois et al., 2013

Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas & Artois, Tom, 2023, Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama, Organisms Diversity & Evolution (New York, N. Y.) 23 (4), pp. 631-681 : 662-663

Trigonostomum vanmecheleni Artois et al., 2013

( Fig. 19 )

Trigonostomum sp. 3 in Diez et al. (2023)

Known distribution. Venice, Italy ( Artois et al., 2013).

Material and distribution. Cuba: Observations on live animals. Five whole mounts and one specimen for molecular analyses from Bahía Larga (May 25, 2017) (HU XIX.4.37– XIX.4.41); on leaves of T. testudinum , 0.5 m deep, salinity 32‰. Six whole mounts from Bueycabón (25 May 2018 and 20 May 2021) (HU XIX.4.42– XIX.4.47); on leaves of T. testudinum and S. filiforme , 0.5 m deep, salinity 32‰. Remarks. The stylet proper ( Fig. 19a, c : st, 19f) is 48–54 µm long (x =52 µm; n =4), 10–17 µm wide proximally (x =15 µm; n = 4), and 3 µm wide at its midpoint (n = 5). The broader plate ( Fig. 19c : pl1, 19d) of the mantle is 31–36 µm long (x = 33 µm; n = 3) and 12–19 µm wide proximally (x = 15 µm; n = 3). The narrower plate ( Fig. 19c : pl2, e) is 28–35 µm long (x = 32 µm; n = 3) and 13–21 µm wide proximally (x = 17 µm; n = 3). The bursal appendage is 111–115 µm long (x = 113 µm; n = 2) and 15–23 µm wide proximally (x = 19 µm; n = 2). In one specimen, the distal part of the bursal appendage ( Fig. 19a : ba, 19b) appears to be branched in four thin tubes, and in other specimens, clearly in six.

Figures

Fig.19 Trigonostomum vanmecheleni Artois et al., 2013. a Atrial organs. b Bursal appendage. c Hard structures of the copulatory bulb. d, e Mantle plates. f Stylet. a, f From whole mounts. Structures oriented with the anterior end toward the top of the plate