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Comprehensive Description

provided by Smithsonian Contributions to Zoology
Caobangia brandti

Caobangia sp. [in part] Jones, 1969: figs. 1, 4–8.

MATERIAL EXAMINED.—Thailand: [1] Maenam Kaek [Kaek River] at Sakunothayan Waterfall [Wang Nok Nang Aen Waterfall], about 33 km east of Phitsanulok, Phitsanulok Province (16°51′N, 100°32′E), from Brotia (Paracrostoma) pseudosulcospira pseudosulcospira Brandt (USNM-M 704230), coll. R. A. M. Brandt, 6 January 1968 (USNM-W 50663, holotype; USNM-W 50614, 50622–26, 50630, paratypes), wet and dry material; [2] Maenam Kaek at Gaeng Song Waterfall, about 45 km east of Phitsanulok, Phitsanulok Province (16°49′N, 100°36'E), from Brotia (Paracrostoma) pseudosulcospira armata Brandt (USNM-M 704231), coll. R. A. M. Brandt, 6 January 1968 (USNM-W 50615, paratypes), wet and dry material; [3] Kaek Noi River at Thung Salaeng Luang Botanical Garden, about 71 km east of Phitsanulok, Phitsanulok Province (16°52'N, 100°47'E), from Brotia (Brotia) binodosa binodosa (Blanford) (USNM-M 704232), coll. R. A. M. Brandt, 16 December 1967 (USNM-W 50616, 50627–29, paratypes), wet and dry material; [4] Huai Chieng Nam [part of the Kaek Noi River], about 90 km east of Phitsanulok, Phitsanulok Province (16°48′N, 100°55′E), from Brotia (Brotia) binodosa subgloriosa Brandt (USNM-M 704233), coll. R. A. M. Brandt, 17 May 1966 (USNM-W 50617, paratypes), wet and dry material; [5] Maenam Chi [Chi River] near Sarakham, Maha Sarakham Province (16°12′N, 103°17′E), from Anulotaia cf. mekongensis Brandt (USNM-M 419887), coll. H. M. Smith, 21 March 1929 (USNM-W 50618, paratypes), dry material. Laos: [6] Sedone River at Pakse (15°08′N, 105°48′E), from Cipangopaludina chinensis Gray (USNM-M 704234), coll. R. A. M. Brandt, 14 March 1968 (USNM-W 50619, paratypes), dry material; [7] Mekong River at Ban Don Det, south of Khong Island, Sithandone (14°07′N, 105°48′E), from Mekongia jullieni (Deshayes) (USNM-M 704235), coll. R. A. M. Brandt, 13 March 1968 (USNM-W 50620, paratypes), dry material; [8] Mekong River at Ban Seo, south of Khong Island, Sithandone (14°06′N, 105°51′E), from Hyriopsis delaportei (Crosse and Fischer) (USNM-M 704236), coll. R. A. M. Brandt, 6 March 1968 (USNM-W 50621, paratypes), dry material.

DISPOSITION OF ADDITIONAL PARATYPES.—AHF Poly 1090; BMNH ZB 1973.121; MCZ; MNHNP AE 1092; NSMT Pol. P 102; RNHL 14772; UZMC; ZIL; ZMA Pol. 2600; ZMH 13529.

DESCRIPTION.—The external morphology of C. brandti agrees with the account given above in characterizing the genus (Figure 7). The first thoracic setiger has 4 to 8 long unilimbate capillaries and 3 to 5 palmate hooks. Palmate hooks bear from 5 to 9 teeth above the central fang (Figures 9a, 12a,i-p). The terminal teeth in the series are subequal in length and stoutness, and they may be slightly longer and stouter than the more central teeth, which may alternate in length. Thoracic setigers 2 to 7 bear unilimbate capillary setae in progressively decreasing numbers: from 7 to 1 longer upper ones and from 5 to 1 shorter ventral ones (Figure 12b,c). The abdominal segments begin at a point where the ascending gut has a midventral location. There may be as many as 11 rows of low avicular hooks (Figure 12g,j-l,n-p); each row is accompanied by 1 or 2 short limbate capillary setae just lateral to the ascending gut. The first row may be composed of up to 65 individual hooks, their numbers decreasing progressively. One individual with 11 rows showed the following sequence: 54; 56; 20; 34; 32; 23; 12; 1; 3; 1; and 2. At or beyond the last rows of hooks the accompanying limbate capillary setae are replaced by yet shorter capillaries and these, in turn, by single blunt, brushlike setae (Figure 12d-f). Finally, the last 2 to 5 of the brushlike setae are accompanied by single, tall, long-necked avicular hooks (Figure 12h). As many as 27 setal fascicles have been observed, which suggests the presence of at least that number of obscured segments. Apart from the inner ends of the setal fascicles and, to some extent, the extensions of the branchial crown skeleton, the internal anatomy shows no segmentation.
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bibliographic citation
Jones, Meredith L. 1974. "On the Caobangiidae, a new family of the Polychaeta, with a redescription of Caobangia billeti Giard." Smithsonian Contributions to Zoology. 1-55. https://doi.org/10.5479/si.00810282.175