Stenostomum simplex Kepner and Carter, 1931

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 : 8

Stenostomum simplex Kepner and Carter, 1931 ( Fig. 3E )

Studied material: Two whole-mounted individuals photographed alive.

Localities: Site 2 (9/10/2018), associated with benthal microhabitat.

Description: Small whitish animals have a fusiform shape. The anterior region has two small ciliated pits connected to the brain lobes. Two lateral light-refracting bodies associated with the posterior brain lobe. The mouth is located in the first third of the body. The intestine has excretophores, which are located laterally along the entire gut.

Taxonomic remarks: Identification is confirmed based on the habitus of live specimens and general morphology, both corresponding to the description and illustration given by Kepner and Carter (1931), Nuttycombe and Waters (1938) and Marcus (1945b).

Distribution: USA ( Kepner and Carter 1931; Nuttycombe and Waters 1938) and Brazil ( Marcus 1945b).

Figures

Fig. 3. Live specimens of Stenostomidae and Macrostomidae. (A–C) Stenostomum cf. pegephilum: (A) chain with two zooids, (B) schematic representation, (C) detail of the muscular pharynx. (D1–2) Stenostomum saliens: (D1) detail of the anterior region of the body and (D2) dorsal view of the habitus of a specimen. (E) Stenostomum simplex (scale bar not available). (F–G) Stenostomum tuberculosum: (F) individual with three zooids, (G) schematic representation. (H–I) Macrostomum quiritium: (H) dorsal view of a mature specimen, (I) detail of the penis stylet. (J) Macrostomum tuba, detail of the penis stylet.