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Naumovia Gen. N. for Plumularia Microtheca Naumov, 1960, A

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Naumovia Gen. N. for Plumularia Microtheca Naumov, 1960, A © Zoological Institute, St.Petersburg, 1997 Naumovia gen. n. for Plumularia microtheca Naumov, 1960, a deepwater North Pacific species, with remarks on other genera and species of the family.~Kirchenpal{eriidae (Cnidaria, Hydrozoa) S.D. Stepanjants, -A.L. Peiia Cantero, O.V. Sheiko & A. Svoboda Stepanjants, S.D., Pefla Cantero, A.L.. Sheiko, O.V. & Svoboda, A. 1997. Naumovia gen. n. for Plumularia microtheca Naumov, 1960, a deepwater North Pacific species, with remarks on other genera and species of the family Kirchenpaueriidae (Cnidaria, Hydrozoa). Zoosystematica Rossica, 6(112): 9-20. A re-description of Plumulal'ia microtheca Naumov, 1960 (originally placed in Plumu­ lariidae) is given. This species is referred to the new genus Naumovia and to the family Kirchenpaueriidae. Some comments on other genera and species of this family are given. S.D. Stepanjants, Zoolol(ical Institute, Russian Academy ()!'Sciences, Universitetskaya nab. I, St. Petersburl( 11J1J()34, Russia. A. L. Pena Cantero, Departamento de Biolol(w Animal, Facultad de Ciencias Biolo[?icas, £-461()O Burjassot, Valencia, Spain. 0. V. Sheiko, Kamchatka Institute of £coloI(Y, Partizanskaya 6, Petropavlovsk-Kam­ chatsky 683000, Russia. A. Svoboda, Rhur-Universitiit, Universitdtsstr., 150, Bochum D-4468, Germany. Introduction sulevitch, 1980, H. plumularioides (Clark, 1877), Hydrodendron gracilis (F'raser, 1914) A joint investigation of bipolarity problems (cf. Antsulevitch, 1987) must be revised. (Stepanjants, Svoboda & Vervoort, 1996, This publication concerns Plumularia mi­ 1997) raised questions on taxonomic posi­ crotheca Naumov, 1960, which is placed here tion ofcertain species of hydroids discovered in a new genus Naumovia (the description of earlier in seas of the Northern and Southern the genus is given after redescription of the hemispheres. In particular, representatives type species). of the family Kirchenpaueriidae have not been recorded from Eurasian Arctic Seas, Naumovia microtheca (Naumov, 1960), comb. n. the North Pacific bordering Asia and the (Figs 1-9) Black Sea, whereas species of this family are common in the North Atlantic, the eastern Plumularia microtheca Naumov, 1960: 462. part of the North Pacific and the Southern Ocean. This prompted us to revise the taxo­ Lectotype (designated here). Colony composed of nomic position of certain species from the c. 40 small stems, rising frol11 a filiform hydrorhizum, Arctic Seas, the North Pacific and the Black growing on the polysiphonic stem ofanother hydroid Sea. For example, the taxonomic status of colony. Sea of Okhotsk, depth 2300 m, "Vityaz", Plumularia microtheca Naumov, 1960, P. SL143, 3. 1Q.1949. Deposited in collection ofthe Zoo­ logical Institute of the Russian Academy of Sciences magellanica moneroni Naumov, 1960, P. (ZIN RAS), No. 10294/1. Fragments in Kamchatka fragiiis Hamman, 1882, P. linkoi Naumov, Institute of Ecology (KOOP, No. KIE 1/1547) and in 1960, Schizotricha divergens Naumov, 1960 National Museum of Natural History, Leiden, The (cf. Naumov, 1960), Halecium linkoi Ant- Netherlands (slide No. 3572), o oN oC/) -<C/) :-l i'J oC/) C/) n » < £. Figs 1-2. 1, lectotype colony of Nau!l1l11'iul11icrocheca drifted along the other hydroid stem; 2. stem of the lectotype colony of N. !l1icmcheca. 0- ZOOSYST ROSSICA Vol. 6 • SD. Stepanjants & al.: NauJ110via Kell. 11. 11 Puralectotypes. (No. 1). Six stems attached to Hydrothecal internodes with only mesial small stones by thin hydrorhiza from the Bering Sea, superior nematophore placed in front of hy­ Commander Islands, Medny Isl., depth 110 m, drothecal rim and sometimes closed by a "Vityaz", St. 529, 19.08.1950; in collection of ZIN thin theca, without nematophore below hy­ RAS (No. 10295/2), fragments in KOOP (No. KIE 2/1548). (No. 2). Four stems and two colony frag­ drotheca (Fig. 7, C, D, E, F). It is remark­ ments from the Kuril Islands, Paramushir Isl., depth able that there are no nematocysts in the zo­ 296 m, "Lebed", SI. 132, 3.08.1954; in collection of oids (gastrozooids and nematophores). Only ZIN RAS (No. 10296/3) and in KOOP (No. KIE one type of nematocyst could be found in 311549). (No. 3). Colonies from the Sea of Okhotsk, stem tissue (see below). In colonies from depth 506 m, "Vityaz", St. 2758, 21.05.1954, also lesser depths (see below), two types of nema­ considered by Naumov as P. microthew ( o. 4 111 tocysts have been observed; this seems to in­ ZI N collection), belong to another species. dicate a linkage between the cnidome and Description of lectotype. Hydrorhizum the bathymetric distribution of this species. (stolon) filiform, developing on polysiphonic Gonothecae situated on cauline apophyses stem of unidentifiable hydroid of which the (Fig. 7, A); one gonotheca per apophysis. In stem, composed of c. 20 closely adnate tubes, lectotype colony, all gonothecae are imma­ cut off at the top and expanded into a plate at ture, therefore the sex cannot be distin­ the base, without apophyses, branches, hy­ guished. drothecae or zooids (Figs 1-5). One tube Measurements (in mm): Substrate colony: growing on the surface of the supporting length of stem c. 140; basal diameter of stem stem not. parallel to remaining tubes but 4.5; distal diameter of stem 1.5. Naumovia forming loops around them (Fig. 6); it may microtheca: length of stems up to 80; diame­ be treated as filiform hydrorhizum of the ex­ ter of stems 1.04-2.60; hydrocladial length 4­ amined species. 10; hydrocladial diameter 0.7-0.9; number of Stems of lectotype colony irregularly ar­ hydrothecae per hydrocladium 5-14; number ranged around the stem of the supporting of ahydrothecate internodes per hydro­ colony (Fig. 6). Cnidome ofsubstrate colony cladium I (occasionally more); length of hy­ and these stems showing distinct differences drothecate internodes 0.52-0.72; diameter of (see below). hydrothecate internodes 0.09-0.12; length of Stems of the investigated colony broken ahydrothecate internodes 0.15-0.19; diame­ up into internodes (about 30 per stem), with­ ter of ahydrothecate internodes 0.07-0.09; out hydrothecae and nematophores. Each hydrothecae: length of abcauline wall 0.10­ cauline internode with 1-5 apophyses sup­ 0.13, length of adcauline wall 0.10-0.12, di­ porting hydrocladia. Apophyses alternately arranged either in one plane or in slightly ameter of aperture 0.13-0.17; gonothecae: different planes (Fig. 7, A). Each stem bear­ length c. 0.6, diameter 0.26-0.45. ing 20-90 hydrocladia. Sometimes hydro­ Nematocysts (in ~m): microbasic mastigo­ cladium connected with apophysis through phores (rhabdoids sensu Boshenova, 1988) 'an intermediate ahydrothecate internode 9-10 x 2.5-2.6 and 6-6.5 x 2. Capsulae ofsub­ (Fig. 7, A. B). Each apophysis with two ne­ strate-colony stem belonging to another type matophores: one on upper part of apophysis haplonemes: 15-16 x 5 (Fig 7, G, H). and sometimes provided with bithalamic ne­ Description ofparalectotypes. No. 1. All 6 matotheca, the other, sometimes obscure, at . stems most probably are fragments of the axil between apophysis and cauline inter­ same colony, whose filiform hydrorhiza node and without nematothecae (Fig. 7, B-D). weaves the black stones druse. Stems emerg­ Hydrocladia unbranched and divided into ing from filiform hydro"rhiza and divided 5-15 internodes per hydrocladium. Each hy­ into illegible internodes bearing 3-5 apo­ drocladial internode with hydrotheca placed physes per internode. on middle of internode (4-15 hydrothecae Hydrocladium divided into 7-15 hydrothe­ per hydrocladium); sometimes .' -2 ahy­ cate and 1-3 ahydrothecate internodes (Fig. drothecate internodes present (FIg. 7, D). 8, A, B). Shape and distribution of hydrothe­ Hydrocladial walls with thick perisarc (Fig. cae and nematophores as in the lectotype 7, B, D, F). Hydrotheca low; adcauline wall colony (Fig 8, A-D). entirely adnate, slightly shorter than the ab­ Measurements (in mm): length of stems cauline one; hydrothecal aperture slightly 60-130; diameter of stems 0.39-0.46; length tilted adcaudally. Hydrothecal rim even and of hydrocladia 6-19; length of hydrothecate smooth. Perisarc of abcauline hydrothecal internodes 0.39-0.49; diameter of internodes wall and hydrothecal base thickened (Fig. 3, 0.10-0.13; length of ahydrothecate inter- E, F). Figs 3-4. Naumol'io microtheco, lectotype colony. 3, hydrorhiza drifted along the polysiphonic stem of the other species of hydroid; 4, fragment ofthe stem ofT the substrate colony. ZOOSYST. ROSSICA Vol. 6 • S. D. Slel'Unjunts & ul.: Nuumol'iu Ken. 11. 13 Fig. 5. NUl/nulI.iu microlhem. lectotype colony. hydrorhiza drifted along a fragmcnt of the polysiphonic stem of the substrate colony. nodes 0.07-0.09; hydrothecae: length of ab­ length of hydrocladial internodes 0.52-0.59; cauline wall 0.13-0.16, length of adcauline hydrothecae: length of abcauline wall 0.09­ wall 0.11-0.13, diameter of aperture O.JI­ 0.11, length of adcauline wall 0.09-0.10: di­ 0.13; gonothecae (Fig. 8, E): length 1.6-1.9, ameter of aperture 0.13-0.14. diameter 0.43-0.49. Nematocysts (in ~m): microbasic mastigo­ Nematocysts (in ~m): microbasic mastigo­ phores (rhabdoids) 5.2-6 x 1.8-2 (Fig. 9, f). phores (rhabdoids) in two dimensional No. 3. This material was identified by D. V. groups: 9.5-10.5 x 3 and 6-6.5 x 2 (Fig. 8, F). Naumov as P. microtheca too (see above). No. 2. These colonies belong probably to One colony with monosiphonic stem and NmUI101';a lIlicrotheca (Fig. 9, A-f). They dif­ divided inlo 38 internodes: 'each one with fer from the lectotype colony in having 2 one apophysis connected with unbranched apophyses per cauline internode and slightly hydrocladium through a short ahydrbthe­ smaller hydrothecae. Colonies are sterile. cate internode (F.'ig. 10, A. B). Up to 4 hy­ Measurements (in mm): length of stems 6­ drothecate internodes per hydrocladium.
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