The number of zoeal stages in larval development of Nihonotrypaea petalura (Stimpson, 1860) (Decapoda: Axiidea: Callianassidae) from Russian waters of the Sea of Japan

Larval development of the symbiotic crab Sestrostoma balssi (Shen, 1932) (Varunidae: Gaeticinae) inhabiting Russian waters of the Sea of Japan is described and illustrated for the first time from material reared in the laboratory. The development includes five zoeal and a single megalopal stages. The first megalopa was attained at 20–22°C 35 days after hatching. The present paper is the first description of the complete larval development in the genus Sestrostoma. The larvae of S. balssi share all principal characters of the family Varunidae but are distinguished from the typical varunid larvae by the absence of a well-developed antennal exopod in the zoea and the presence of an 8-segmented antennal flagellum in the megalopa.

Download Full-text

The larval development of the mud shrimp Upogebia issaeffi (Balss, 1913) (Decapoda: Gebiidea: Upogebiidae) reared under laboratory conditions

Zootaxa ◽

10.11646/zootaxa.3269.1.3 ◽

2012 ◽

Vol 3269 (1) ◽

pp. 31 ◽

Cited By ~ 8

Author(s):

ELENA S. KORNIENKO ◽

OLGA M. KORN ◽

DARYA D. DEMCHUK

Keyword(s):

Larval Development ◽

Sea Of Japan ◽

Zoeal Stage ◽

The Sea Of Japan ◽

Laboratory Conditions ◽

Mud Shrimp ◽

First Time ◽

Russian Waters

Larval development of the mud shrimp Upogebia issaeffi (Balss, 1913) (Decapoda: Gebiidea: Upogebiidae) is describedand illustrated for the first time from material reared in the laboratory. The development includes four zoeal and a singlemegalopal stages. At 20–22°C the first megalopa was attained 12 days after hatching. U. issaeffi is distinguished from U.major, the second upogebiid species inhabiting Russian waters of the Sea of Japan, by the presence of the fourth zoeal stage and considerably more intensive larval setation.

Download Full-text

Henricia djakonovisp. nov. (Echinodermata, Echinasteridae): a new sea star species from the Sea of Japan

PeerJ ◽

10.7717/peerj.2863 ◽

2017 ◽

Vol 5 ◽

pp. e2863 ◽

Cited By ~ 2

Author(s):

Anton Chichvarkhin

Keyword(s):

New Species ◽

Sea Of Japan ◽

Common Species ◽

Sympatric Species ◽

Variable Number ◽

The Other ◽

The Sea Of Japan ◽

Sea Star ◽

The Pacific ◽

Russian Waters

A new sea star species,H. djakonovisp.n., was discovered in Rudnaya Bay in the Sea of Japan. This is a sympatric species of the well-known and common speciesHenricia pseudoleviusculaDjakonov, 1958. Both species are similar in body size and proportions, shape of skeletal plates, and life coloration, which distinguishes them from the otherHenriciaspecies 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 onlyHenriciaspecies in Russian waters of the Pacific that possesses such spines with a massive, smooth, bullet-like tip. The spines inH. pseudoleviusculaare 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 inH. pseudoleviuscula.

Download Full-text