Saturday, January 6, 2018

[Mollusca • 2018] Revision of Platydoris angustipes and Description of A New Species, Platydoris guarani, (Gastropoda: Nudibranchia) from southeastern Brazil Based on Comparative Morphology


Platydoris guarani
de Lima & Simone, 2018


Abstract
Platydoris angustipes (Mörch, 1863) is a common nudibranch in the Western Atlantic, ranging from Florida, USA, to Rio de Janeiro, Brazil. In this study, we examined the anatomy of P. angustipes along its distribution, including its type material. Our analysis shows consistent differences between the Caribbean and Brazilian populations, mainly in the reproductive system, radular teeth and odontophore musculature. This strongly suggests that the two populations actually belong to distinct species. The Brazilian population is described herein as a new species, Platydoris guarani sp. n.

Key Words: Discodorididae, Platydoris angustipes, Platydoris guarani, new species

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Family Discodorididae Bergh, 1891
Genus Platydoris Bergh, 1877
Type species: Doris argo Linnaeus, 1767,
by subsequent designation (O’Donoghue 1929).

• Platydoris angustipes (Mörch, 1863)

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Figure 7. Platydoris guarani, living animals. A. Dorsal view, specimen from Papagaio, Cabo Frio, Rio de Janeiro (MZSP 97331). B. Same, ventral view.

Platydoris guarani, living animals. C. Living animal with spawning, specimen from Enseada da Meia Lua, Cabo Frio, Rio de Janeiro (MZSP 97625).  

Figure 7. Platydoris guarani, living animals.
A. Dorsal view, specimen from Papagaio, Cabo Frio, Rio de Janeiro (MZSP 97331). B. Same, ventral view. C. Living animal with spawning, specimen from Enseada da Meia Lua, Cabo Frio, Rio de Janeiro (MZSP 97625).
All photograph by V. Padula. 

•  Platydoris guarani sp. n.

Etymology: The specific epithet is a noun in apposition, derived from the native Guarani indigenous people, some tribes of which still reside in Rio de Janeiro.

Diagnosis: Body of orange color, with a white ribbon on its edge and brown spots just above the ribbon (they can be seen both dorsally and ventrally). Radula with outermost teeth not spatulate, with apex hook-shaped; cusp simple and smooth. Presence of m4a and m7b odontophore muscles. Gonad readily visible. Absence of spines on internal surface of penis and vagina.

Distribution: Brazil (Valdés et al. 2006). Pernambuco: Fernando de Noronha (García et al. 2002); Alagoas: Saco da Pedra (Padula et al. 2012); Bahia: Praia de Itapoã (García et al. 2008); Rio de Janeiro: Cabo Frio: Ilha Comprida; Arraial do Cabo: Prainha (Alvim and Pimenta 2014).

Habitat: Under stones, associated with sponges and ascidians (García et al. 2002), from 0 to 17 m depth.


 Patricia O. V. de Lima and Luiz Ricardo L. Simone. 2018. Revision of Platydoris angustipes and Description of A New Species of Platydoris (Gastropoda: Nudibranchia) from southeastern Brazil based on Comparative Morphology. Zoosystematics and Evolution. 94(1); 1-15.  DOI: 10.3897/zse.94.14959


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