Thursday, January 12, 2017

[Invertebrate • 2017] Henricia djakonovi • A New Sea Star Species (Echinodermata, Echinasteridae) from the Sea of Japan


Henricia djakonovi Chichvarkhin, 2017


Abstract

A new sea star species, Henricia djakonovi sp.n., was discovered in Rudnaya Bay in the Sea of Japan. This is a sympatric species of the well-known and common species Henricia pseudoleviuscula Djakonov, 1958. Both species are similar in body size and proportions, shape of skeletal plates, and life coloration, which distinguishes them from the other Henricia species inhabiting the Sea of Japan. Nevertheless, these species can be distinguished by their abactinal spines: in both species, they are short and barrel-like, but the new species is the only Henricia species in Russian waters of the Pacific that possesses such spines with a massive, smooth, bullet-like tip. The spines in H. pseudoleviuscula are crowned with a variable number of well-developed thorns. About half (<50%) of the abactinal pseudopaxillae in the new species are oval, not crescent-shaped as in H. pseudoleviuscula.
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Keywords:  Sea of Japan, East sea, New species, Asteroidea, Spinulosida, Taxonomy


Henricia djakonovi  Chichvarkhin, 2017

Figure 4: Henricia djakonovi in natural environment, Rudnaya Bay, 5 Oct 2015 (specimen not preserved).
DOI: 10.7717/peerj.2863   

Ecology: The species was found on solid rock at the depths of 14–18 m at water temperature of 2–6°C.

Etymology: The name is dedicated to A.M. Djakonov, the famous Russian (Soviet) echinoderm taxonomist who described several species in the genus Henricia.


Anton Chichvarkhin. 2017. Henricia djakonovi sp. nov. (Echinodermata, Echinasteridae): A New Sea Star Species from the Sea of Japan.
 PeerJ. DOI: 10.7717/peerj.2863 

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