1 NEW SPECIES OF THE BRYOZOAN GENERA BATOPORA AND LACRIMULA (BATOPORIDAE) FROM AUSTRALIA P. L. COOK 1 & P. E. BOCK 2 1 Honorary Associate, Marine Biology Section, Museum of Victoria, GPO Box 666E, Melbourne, VIC 3001, Australia. 2 School of Ecology and Environment, Deakin University, Melbourne Campus, Burwood Highway, Burwood, Victoria COOK, PATRICIA L. & BOCK, PHILIP E. 2004:12:04. New species of the bryozoan genera Batopora and Lacrimula (Batoporidae) from Australia. Proceedings of the Royal Society of Victoria 116(2): ISSN Examination of samples of bryozoans from the south- eastern slope sediments of Australia ( Franklin SLOPE Stations 6, 7), has revealed the presence of many specimens of several genera with species which have minute, rooted colony forms. Among these are new species of the genera Batopora Reuss (B. problematica) and Lacrimula Cook (L. affinis). The structure of colonies is briefly described. The family Batoporidae is considered to contain only these two genera, although they have relationships with the discoidal genus Orbitulipora, and similarities in colony form to the genera assigned to the Conescharellinidae. Keywords: THE STRUCTURE and affinities of both Batopora and Lacrimula were described by Cook & Lagaiij (1976) in some detail. Copiously illustrated notes on the astogeny of Batopora have recently been provided by Pizzaferri & Braga (2000). Both genera include small, conical or globular (conescharelliniform) colonies, which are known from Recent examples, to be anchored by rootlets. Colonies are formed entirely by reversed frontal budding, and in this respect are similar to species of both Conescharellinidae and the genus Sphaeropora (Lepraliellidae). However, the Batoporidae does not appear to be closely related to either of these groups. Material and methods. All specimens are part of the collections of the Museum of Victoria (NMV), and were collected by the RV Franklin from two Stations: Stn 6 off Nowra NSW S E 770 m, , bottom, crinoid dominated, and Stn 7 off Nowra NSW S E 1096 m, , epibenthic sled. All the colonies of Batopora and Lacrimula were accompanied by two species of Trochosodon and four species of Conescharellina. Measurements. Lor, lor, length and width of orifice; Lov, lov, length and width of ovicell; Lav, lav, length and width of avicularian rostrum. BATOPORIDAE Neviani, 1901 Batoporideae Neviani 1901: 220 (106). Orbituliporidae Canu & Bassler 1923 part; Cook & Lagaaij 1976 part. Batoporidae (presumably for Batoporideae) Gordon & d Hondt 1997: 70. Type genus. Batopora Reuss (1867) Remarks. Batoporidae includes only Batopora and Lacrimula. Gordon & d Hondt (1997) emended Neviani s name, and regarded it as a senior synonym of Orbituliporidae in general, but did not discuss which genera had been assigned to either family. Neviani (1901) included Batopora with Conescharellina, which last is referable to the family Conescharellinidae. Canu & Bassler (1923) included a wide range of genera, the majority of which has been assigned subsequently to other families. Batopora and Lacrimula include a range of very similar forms. At present, the distinction between genera relies upon the differences in shape of primary orifice, in the origin of rootlets, and in the relationships of the ovicell. Orbituliporidae is maintained here for the discoidal genus Orbitulipora. 59
2 PATRICIA L.COOK AND PHILIP E. BOCK Fig. 1. A-D, Batopora problematica sp. nov. A, D. Holotype, NMV F98031, A. Colony, adapical view showing central kenozooid and two ovicells, x42. D. Central kenozooid showing cribrate plate, x110. B, C. Paratype, NMV F B. Lateral view of colony with ovicells, x36. C. Detail of primary orifice and ovicell, x108.
3 NEW SPECIES OF THE BRYOZOAN GENERA BATOPORA AND LACRIMULA (BATOPORIDAE) Batopora Reuss 1867 Type species. B. stoliczkai Reuss 1867: 223. pl. 2, figs 2-4. Description. Colonies usually small (up to 3 mm diameter in one species), globular or conical (conescharelliniform), all zooids originating from reversed frontal buds. Zooid orifices not sinuate, with a slightly curved antapical edge. Ovicells prominent, peristomial, not closed by the operculum. Avicularia small, interzoooidal, with paired condyles, or absent. Rootlets arising from an adapical pit, surrounded by kenozooids, or from a single, central, prominent adapical kenozooid. Recent species are from deep, or very deep water. Remarks. The type species, from the Lower Oligocene of Germany, has very small globular colonies with minute interzooidal kenozooids. A better understanding of the characters of the species B. stoliczkai, and its relationship with B. multiradiata Reuss 1869, requires revision of the European material. The genus has a long fossil record extending from the Lower Eocene of Europe (Cook & Lagaaij 1976). Gordon & d Hondt (1997) have suggested that Batopora sensu lato almost certainly includes a diversity of species which may not be strictly congeneric. It is also obvious that the increasing diversity of known forms of Lacrimula Cook makes separation of the genera somewhat arbitrary, and we agree that both Batopora and Lacrimula require revision. Gordon & d Hondt (1997) introduced a new genus group, Ptoboroa, for a previously named species, Batopora pulchrior Gordon (1989), from New Zealand, and added a new form, P. gelasinus, from New Caledonia. Both these species were illustrated with distinct adapical pores on the edge of the peristome. These pores are known to be the origin of ovicells in Conescharellinidae, the development of which was illustrated in Conescharellina by Gordon (1985, fig. 23) and in P. pulchrior by Gordon (1989, pl. 48A). The ovicells of P. pulchrior have an ectooecium and wide entooecial frontal area, and resemble those known in species of Conescharellinidae. The ovicells of Batopora and Lacrimula are peristomial and hyperstomial respectively, do not have an exposed entooecial area, and do not develop from an adapical pore. It appears therefore, that in spite of its central, cribrate rootlet kenozooid, which is almost exactly like that of B. problematica, Ptoboroa pulchrior is not a member of the Batoporidae, but is referable to a distinct genus of Conescharellinidae. Batopora problematica sp. nov. (Figs 1A-D, 2A) Holotype. NMV F98031, figured specimen SLOPE Stn 7 Paratype. NMV F98032, figured specimen. SLOPE Stn 7 Other material. SLOPE Stn 7, 10 colonies, 9 with ovicells, 1 with rootlet. SLOPE Stn 6, 5 colonies, 4 with ovicells, 1 with rootlet. Etymology. problema (Gr.), a puzzle, referring to the complex of morphological characters present. Description. Colonies small, stellate, fairly flat, with an adapical central kenozooidal rootlet tube, which has a central cribrate plate. Zooids in whorls of 4-5; frontal calcification finely granular, mainly imperforate with rare marginal frontal septular pores. The zooids have elongated peristomes, which are extended antapically, concealing a primary orifice which is curved on the antapical side in an adapical direction. Ovicells, large, prominent, peristomial, not closed by the operculum, frontal calcification similar to zooids. Avicularia absent. Remarks. B. problematica has far smaller colonies than B. murrayi Cook (1966) from the western Indian Ocean, but resembles B. lagaaiji and B. nola from eastern South Africa, described by Hayward & Cook (1979), and discussed by Cook (1981). These latter species have colonies that are similar in size to B. problematica, but are proportionally higher, with a smaller central, rootlet kenozooid. An unnamed species from a New Caledonian locality (without data), was figured by d Hondt (1986, pl. 8, fig. 2), and appears to resemble B. problematica. Gordon (1989: 81) suggested that it might be placed in the same genus as B. pulchrior. The strikingly similar appearance of Batopora problematica and the type species of Ptoboroa Gordon & d Hondt (1997), Batopora pulchrior Gordon (1989), emphasizes the complexities of morphological characters and character states found among species and putative generic groups with conescharelliniform colonies. To a certain extent, this is a result of the constraints of minute size, reversed
4 PATRICIA L.COOK AND PHILIP E. BOCK Fig. 2. A, Batopora problematica sp. nov. Paratype NMV F Detail of broken ovicell showing relationship between peristome and ovicell, x170. B-D, Lacrimula affinis sp. nov. B. Holotype NMV F Colony showing adapical kenozooids, x26. C. Paratype F98034, Antapical surface of colony showing frontal septular pores, x30. D. Paratype F98034, Orifices with avicularia, x47.
5 NEW SPECIES OF THE BRYOZOAN GENERA BATOPORA AND LACRIMULA (BATOPORIDAE) frontal budding, and a mode of life involving anchorage by rootlets into fine-grained substrata. Measurements. Av. colony diameter 2.3 mm; height 1.1 mm; diameter of central kenozooid 0.30 mm; Lov 0.23 mm; lov 0.30 mm; Lor ; lor mm. Lacrimula Cook 1966 Lacrimula Cook 1966: 217. Type species. Lacrimula burrowsi Cook 1966: 218, pl. 2, figs 2, 3, 4, text-fig. 4A. Description. Colonies stellate, conical or bell-shaped. Zooids alternating in whorls; zooid orifices large, with small paired condyles. Avicularia interzooidal or oral, small, with condyles or a bar. Adapical kenozooidal rootlet complex often associated with avicularia. Ovicells large, hyperstomial, closed by the operculum. Remarks. Like Batopora, Lacrimula has a long fossil record, extending from the Eocene of Europe and also occurs in the Miocene of Indonesia (Cook & Lagaaij 1976). Recent species from the Indian Ocean tend to be from slightly shallower depths than those of Batopora, but the large numbers of colonies from over 1000 m off Australia suggest that species of both genera probably share a similar range. Lacrimula affinis sp. nov. (Fig 2B-D) Holotype. NMV F98033, figured specimen SLOPE Stn 7. Paratype. NMV F98034, figured specimen SLOPE Stn 7. Other material. SLOPE Stn 7, 50 colonies, 8 with rootlets SLOPE Stn 6, 7 colonies, 1 with rootlet Etymology. affinis (L) - like, referring to the similarities with L. burrowsi. Description. Large, conical Lacrimula colonies, with a heavily calcified adapical area formed by kenozooids. Zooids in whorls of 5-6, bulbous; primary orifices large, rounded, with small paired condyles; peristome absent. Zooid calcification coarsely granular, mainly imperforate except for few marginal septular pores. Avicularia small, rare, on the antapical side of the orifice, with a rounded rostrum and mandible slung on complete bar. Ovicells not found. Remarks. L. affinis is very similar in appearance to L. burrowsi from the western Indian Ocean (Cook 1966). The colonies are of a comparable size, but the orifices of L. affinis are significantly larger than those of L. burrowsi. Colonies differ principally in the form and distribution of the avicularia and the small size of the orifice articular condyles. L. burrowsi frequently has large avicularia near the adapical region, but all the colonies of L. affinis have a massive development of secondary calcification in this region, and avicularia cannot be seen. The avicularia of L. burrowsi are interzooidal and have mandibles slung on elongated paired condyles; those of L. affinis are oral and antapical, and have a delicate complete bar. Ovicells in L. burrowsi and L. pyriformis Cook are known to be large, hyperstomial and closed by the operculum. Measurements. Average colony diameter 2.5 mm; height 3.3 mm; Lor 0.23 mm; lor 0.22 mm; Lav and lav, 0.11 mm. DISCUSSION These records are the first for the family Batoporidae from the Australian region. The occurrence of B. problematica and L. affinis from deep water off eastern Australia extends the known distribution of both genera to the Tasman Sea, although species are known from Fiji and New Caledonia. An unnamed species of Lacrimula from deep water (677 m.) in the China Sea was illustrated by Cook (1981, Pl.C, fig. 3), but Lacrimula sinensis Lu (1991: 73, Pl. 20, fig.3), from the South China Sea, appears to belong to the genus Characodoma, as do also the specimens of Osthimosia species he figured. Colonies of Characodoma are frequently small, rooted, and associated with conescharellinid and batoporid species under sand-fauna conditions (Cadée 1987, Cook & Bock 1996, and Rosso 1999). The large number of colonies of Batoporidae in the Australian samples described here is the direct result of the method of collection by epibenthic sled. Both B. problematica and L. affinis were found from greater depths than other species, although the range
6 PATRICIA L.COOK AND PHILIP E. BOCK of B. murrayi overlaps that of B. problematica. ACKNOWLEDGEMENTS The specimens were collected on a voyage of C.S.I.R.O. MV Franklin. Staff of the Museum of Victoria who participated in the sampling and sorting of this material include Dr Jan Just. REFERENCES. CADÉE, G. C., The shallow soft-bottom faunas of the Java Sea and Banda Sea. In Bryozoa: Present and Past, J. R. P. Ross, ed., Western Washington University, Bellingham: CANU, F. & BASSLER, R. S., North American later Tertiary and Quaternary Bryozoa. United States National Museum Bulletin 125: 1-302, pl COOK, P. L., Some sand fauna Polyzoa (Bryozoa) from Eastern Africa and the northern Indian Ocean. Cahiers de Biologie Marine 7: COOK, P. L., The potential of minute bryozoan colonies in the analysis of deep sea sediments. Cahiers de Biologie Marine 22: COOK, P. L. & BOCK, P. E., Characodoma Maplestone, a senior synonym of Cleidochasma Harmer (Cleidochasmatidae). In Bryozoans in Space and Time, D. P. Gordon, A. M. Smith & J. A. Grant-Mackie, ed., NIWA, Wellington: COOK, P. L. & LAGAAIJ, R., Some Tertiary and Recent conescharelliniform Bryozoa. Bulletin of the British Museum (Natural History), Zoology 29: , pl GORDON, D. P., Additional species and records of Gymnolaemate Bryozoa from the Kermadec region. Records of the New Zealand Oceanographic Institute 4: GORDON, D. P., The marine fauna of New Zealand: Bryozoa: Gymnolaemata (Cheilostomida Ascophorina) from the western south Island continental shelf and slope. New Zealand Oceanographic Institute Memoir 97: 1-158, pl GORDON, D. P. & D HONDT, J.-L., Bryozoa: Lepraliomorpha and other Ascophorina from New Caledonian waters. Mémoires du Muséum National d Histoire Naturelle 176: HAYWARD, P. J. & COOK, P. L., The South African Museum s Meiring Naude Cruises. Part 9, Bryozoa. Annals of the South African Museum 79: D HONDT, J.-L., Bryozoaires de Nouvelle- Caledonie et du plateau des Chesterfield. Bulletin du Muséum national d histoire naturelle série 4, 8A (4): LU LINHUANG, Holocene bryozoans from the Nansha sea area. In Quaternary Biological Groups of the Nansha Islands and the Neighbouring Waters, Edited by the Multidisciplinary Oceanographic Expedition Team of Academia Sinica to the Nansha Islands, Zhongshan University Publishing House, Guangzhou: 11-81, , pl. (Section 2) NEVIANI, A., Briozoi neogenici delle Calabrie. Palaeontographia Italica 6 (1900): PIZZAFERRI, C. & BRAGA, G., Nuove osservazioni sullo sviluppo astogenetico di Batopora rosula (Reuss), Bryozoa Cheilostomatida del Miocene del Pedeappennino Parmense. Annali dei Museo civico - Rovereto 14 (1998): REUSS, A. E., Über einige Bryozoen aus dem deutschen Unteroligozän. Sitzungsberichte der Akademie der Wissenschaften in Wien (Abt. 1) 55: REUSS, A. E., Paläontologische Studien uber die älteren Tertiärschichten der Alpen, II, Die fossilen Anthozoen und Bryozoen der Schichtengruppe von Crosara. Denkschriften der Kaiserlichen Akademie der Wissenschaften, Wien 29: ROSSO, A., Recent and fossil species of Characodoma Maplestone from the Mediterranean with description of two new species. Journal of natural history 33:
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