A. V. Chernyshev

System of Families of Enoplan Nemerteans of the Order Eumonostilifera (Nemertea: Enopla)

The paper is a review of the family-level classifications of the order Eumonostilifera. The elaboration of a phylogenetic system of Eumonostilifera is not yet possible. Some new groups, presumably monophyletic, have been distinguished, which are considered to be of a family rank (Neesiidae fam. n., Sacconemertidae stat. n., Zygonemertidae fam. n., Prostomatidae, Acteonemertidae fam. n., and Potamonemertidae fam. n.). The proposed system is a typological one; however, it can be used as a basis for further taxonomical and phylogenetic studies.

Classification System of the Higher Taxa of Enoplan Nemerteans (NEMERTEA, ENOPLA)

The main classifications of the subclass Enopla were revised, and a new classification of enoplan nemerteans was proposed. The status of the orders Pelagica, Reptantia, and Bdellomorpha remained unchanged. The group Monostilifera was classified into two genera: Cratenemertea ord. n. and Eumonostilifera ord. n. The following new taxa were distinguished: Sagaminemertida infraord. nov., Sagaminemertidae fam. nov., Uniporida infraord. nov., Drepanophorida infraord. nov., and Korotkevitschiidae fam. nov.

Nemertean larvae of the ototyphlonemertidae family in the plankton of Peter the Great Bay, Sea of Japan

Larvae of two nemertean species,Ototyphlonemertes (O.) martynovi Chernyshev, 1993 andOtotyphlonemertes (Norenburgia) sp., found in the neritic plankton of Peter the Great Bay, the Sea of Japan are described. The larvae of both species had two statocysts and a pair of eyes, but differed in the number of statoliths and in their tactile cirri. Changes of some traits during ontogenesis are discussed.

Larval development of nemerteans of the genus Quasitetrastemma (Nemertea: Monostilifera)

Data on the larval development of Quasitetrastemma stimpsoni and Q. nigrifrons are presented. In both species, fertilization is external; the development passes through a free-swimming larval stage, the “hidden larva.” The larva has three pairs of eyes. After settling, the eyes of the second pair fuse with eyes of the first pair or are completely reduced. The basis and stylets are formed in 7–8 days after fertilization. Larvae of Q. stimpsoni settle on day 9–10 after fertilization; and Q. nigrifrons, on day 7–8.

New Species of the Genus Hubrechtella (Nemertea, Anopla) from the Sea of Japan and Validation of the Family Hubrechtellidae

The paper includes a description of Hubrechtella juliae sp. nov. from Peter the Great Bay. Based on the paraphyly of the family Hubrechtiidae s.l., we propose to combine the genera Hubrechtella, Tetramys, and Coelia into the family Hubrechtellidae fam. nov.

The Larvae of Unarmed Nemerteans in Peter the Great Bay (Sea of Japan)

Nemertean pilidia belonging to the groups magnum, pyramidale, gyrans, recurvatum, and auriculatumwere found in Peter the Great Bay. Pilidium auriculatumis probably a little-known ribbon worm of the family Hubrechtiidae, which has never before been found in the Sea of Japan. Larvae of two species of the order Archinemertea were also found.

Food and feeding behavior of the nemerteanTortus tokmakovae

The food and feeding behavior of the suctorial nemerteanTortus tokmakovae Chernyshev, 1991, inhabiting the intertidal zone of Peter the Great Bay are studied. Laboratory observations show that this tortus is capable of attacking and consuming 6 species of amphipods, Mysidae gen. sp. mysids andPandalus sp. shrimps. Moreover, the tortuses suck the tissues of various dead crustaceans. Several tortuses may together attack and consume one amphipod. It is suggested thatT. tokmakovae play a significant role in intertidal communities.

Nemerteans of the genus Ototyphlonemertes (Enopla: Ototyphlonemertidae) from Van Phong Bay (South Vietnam)

Two species of the interstitial nemerteans from the intertidal zone of Van Phong Bay (southern Vietnam) are described. By the structure of the proboscis and statocysts, the nemertean Ototyphlonemertes ani sp. n. can be referred to the species group “Lactea” (sensu Envall, Norenburg, 2001), but it differs from other species of this group by the presence of cerebral organs and caudal cirri. The second species new for the region is very similar to O. martynovi, but differs from it in having 2 to 3 cephalic cirri in group C (instead of 4 to 6 cirri found in O. martynovi).

First finds of the “sea hare” Aplysia parvula (Gastropoda: Opisthobranchia) in Peter the Great Bay, Sea of Japan

A representative of the family Aplysiidae has been discovered in Peter the Great Bay for the first time: two specimens of Aplysia parvula were collected in September 2005 near Furugelm Island. A short description of the specimens found is given.

New Data on Rotifers of Peter the Great Bay, Sea of Japan

The first records of 11 species of rotifers from Peter the Great Bay (Sea of Japan) are reported. Of these, Synchaeta grimpei, Aspelta clydona, Encentrum algente, and E. graingeri are the first records for the Pacific Ocean. Synchaeta pacifica and S. posjetica described from Peter the Great Bay by Chaga (1984) are considered as nomen dubium.