Pleurobranchus reticulatus, Rang, 1842

Grzelak, Katarzyna & Sørensen, Martin V., 2022, Echinoderes galadrielae Grzelak & amp; Sørensen 2022, sp. nov., Zoological Studies 55 (15), pp. 1-31 : 26

publication ID

https://doi.org/ 10.5281/zenodo.7225407

persistent identifier

https://treatment.plazi.org/id/7B5BA125-7B5A-0278-4E30-7C88FCF52AB0

treatment provided by

Valdenar

scientific name

Pleurobranchus reticulatus
status

 

Distiction between Pleurobranchus reticulatus View in CoL and P. areolatus of the present study and sensu

Goodheart et al. (2015)

Pleurobranchus reticulatus and P. areolatus were misidentified for a long time because of their simple descriptions, without photographs of living animals. However, living specimens are clearly distinguished by the color of the rhinophores ( Table 1), at least in specimens from Brazil. In mature or juvenile specimens of P. reticulatus , the color of the rhinophores is variable (dark orange, red, dark red or black), but with a single color in each specimen ( Figs. 1 View Fig A-B); while in P. areolatus , the color has the same pattern as the dorsum (with white blotches) ( Fig. 1C View Fig ). Moreover, P. reticulatus is larger (up to 120 mm long) and has more pinnae (12-16) free from the body wall than P. areolatus (up to 50 mm long, with 9 pinnae). The diameter of the mantle tubercles is quite different in P. areolatus (125 - 375 μm, Fig. 1C View Fig ) and P. reticulatus (1-3 mm, Fig. 1 View Fig A-B). Additionally, the penis of P. reticulatus has a more developed leaflet attached in the convex portion of the penis ( Figs. 3 View Fig C-D) in comparison to P. areolatus ; the gonopore is surrounded by two wide flaps in P. reticulatus , which is absent in P. areolatus ; the prostate is tubular and highly convoluted in P. reticulatus , while in P. areolatus is elongated with the proximal portion rounded, seems detached circle ( Fig. 7D View Fig ); and, the jaws of P. areolatus , the smaller species, have more rows and fewer platelets per row (80 transverse rows and 35 platelets per row) than P. reticulatus (59-70 transverse rows and 39-46 platelets per row) ( Table 1). In Brazil, P. reticulatus is a common species, while P. areolatus is rare and until now was only recorded from northeastern Brazil ( Padula et al. 2012).

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