Catenula lemnae Dugès, 1832

Reyes, Jhoe, Binow, Daniela, Vianna, Rogério T., Brusa, Francisco & Martins, Samantha E., 2021, Fig. 12. Majella pristis n in Periclimenaeus djiboutensis Bruce 1970, Zoological Studies 60 (22), pp. 1-33 : 4

Catenula lemnae Dugès, 1832 ( Fig. 2A )

Synonyms: Anortha gracilis Leidy, 1851 .

Catenula gracilis Leuckart, 1854 .

Derostoma catenula Leydig, 1854 .

Stenostomum monocelis Schmidt, 1878 .

Stenostomum gracile Graff, 1882 .

Stenostomum lemnae Graff, 1882 .

Studied material: Live individuals studied, three of them observed in squashed preparations. The rest, fixed in alcohol (MZUSP PL 2257).

Localities: Site 1 (23/06/2018; 28/02/2019) and Site 3 (24/06/2018; 18/02/2019; 05/06/2019), associated with benthal and phytal microhabitats.

Description: Whitish mature individuals 2120 ± 1158.2 μm (1301.1–2939 μm; n = 2) long and 105.4 ± 48.5 μm (52.2–147.2 μm; n = 3) wide, with three to eight zooids. When it is measured only the first zooid, they are 275.4 ± 86.7 μm (195.3–367.4 μm; n = 3) long. They present the typical habitus of the species, i.e., elongated body, rounded anterior region of the body forming the prostomium, pre-oral swelling with ciliated furrows, with a statocyst located just at the ciliated furrow level ( Fig. 2A ).

Taxonomic remarks: Morphology of individuals corresponds to descriptions given by Marcus (1945a b), Noreña-Janssen (1995) and Reyes et al. (2017), for the Neotropical region. Also, C. lemnae found here are following the descriptions, illustrations and pictures of material studied in the Palearctic and Nearctic region ( Luther 1960; Gamo 1987; Noreña et al. 2007; Larsson and Willems 2010).

Distribution: The species is widespread (cosmopolitan), it is found in Sweden ( Larsson and Willems 2010), USA ( Ruebush 1914), Ireland ( Young 2001), United Kingdom ( Young 2001), Spain ( Gamo 1987; Noreña et al. 2007), Perú (Reyes et al. 2017), Brazil ( Marcus 1945b) and Argentina ( Noreña-Janssen 1995). Also, Siberia and Japan (see Luther (1960) and references therein).

Figures

Fig. 2. Live specimens of Catenulida. (A) Catenula lemnae, chain two zooids. (B–D) Myostenostomum vanderlandi: (B) habitus of whole-mounted individual, (C) detail of the anterior brain lobe and (D) detail of the posterior brain lobe. (E–F) Stenostomum glandulosum: (E) live individual, (F) free-hand schematic representation. (G) Stenostomum grande, a single zooid. (H) Stenostomum paraguayense, intestine with some food items. (I) Stenostomum hemisphericum, free-hand schematic representation.