Caobangia abbotti Jones 1974

Caobangia abbotti

Caobangia sp. [in part] Jones, 1969: figs. 2, 3.

MATERIAL EXAMINED.—Malaysia, Sabah: [1] Mile 4, Tambunan Trail, Ranau (05°58′N, 116°41′E), from Brotia pageli (Thiele) (USNM-M 608099), coll. B. C. Walton, 30 August 1953 (USNM-W 50669, holotype; USNM-W 50644, 50654-60, paratypes), wet and dry material; [2] Gomatong, near Kinabatangana (05°42′N, 118°23′E), from Brotia pontificalis pageli (Thiele) (MCZ 185605), coll. H. G. Keith (USNM-W 50645, paratypes), dry material; [3] Penokok River, near Kiau, Mt. Kinabalu (06°03′N, 116°31′E), from Brotia pontificalis agrestis (Reeve) (USNM-M 590308), elevation 4,000 feet (USNM-W 50646, paratypes), dry material. Malaysia, Sarawak: [4] Robin River at Dana Amu (01°03′N, 110°26′E), from Brotia pontificalis von deni Busch (MCZ 227189), coll. D. Thomas, 1956 (USNM-W 50647, paratypes), dry material. Republic of the Philippines, Mindanao Island, [5] San Ramon River, San Ramon [30 km northeast of Zamboanga] (07°00′N, 121°55′E), from Balanocochlis glans Philippi (USNM-M 591929), coll. M. E. McDonald, “attached to large rocks in rushing current” (USNM-W 50648, paratypes), dry material; [6] San Ramon River, San Ramon (07°00′N, 121°55′E), from Balanocochlis glans Philippi (USNM-M 543951), coll. R. T. Abbott, 1945 (USNM-W 50649, paratypes), dry material. Palawan Island: [7] Qwahig River, Puerto Princesa (09°44′N, 118°44′E), from Stenomelania sp. (USNM-M 259372) (USNM-W 50650, paratypes), dry material. Samar Island: [8] Basey (11°17′N, 125°04′E), from [?] Antimelania asperata (Lea), (USNM-W 311026), coll. M. Smith (USNM-W 50651, paratypes), dry material; [9] Stream just east of Napuro (12°02′N, 124°42′E), from Stenomelania sp. (USNM-M 543943), coll. R. T. Abbott, 7 July 1945, water temperature 80°F (USNM-W 50652, paratypes), dry material. Luzon Island: [10] Jovellar River, Jovellar (13°04′N, 123°36′E), from Brotia dactylus Lea (MCZ 96693), coll. P. de Mesa (USNM-W 50653, paratypes), dry material.

DISPOSITION OF ADDITIONAL PARATYPES.—AHF Poly 1091; BMNH ZB 1973.122; MCZ; MNHNP AE 1091; NSMT Pol. P 103; RNHL 14773; UZMC; ZIL; ZMA Pol. 2601; ZMH 13530.

DESCRIPTION.—The external morphology of C. abbotti agrees with the account given in the section on generic characteristics (Figures 8a-d, 20). There are from 4 to 9 ventral palmate hooks in the first setiger, and from 5 to 11 dorsal, very long, limbate capillary setae, provided with narrow limbations. The palmate hooks bear from 7 to 15 small teeth in an arc distal to the central fang and, although the terminal teeth of the series are stouter than the others, they may be subequal, to perceptibly longer than the others (Figures 9b, 13a,k-r). Thoracic setigers 2 to 7 bear unilimbate capillary setae in progressively decreasing numbers: from 14 to 2 longer upper ones, and from 10 to 1 shorter ventral ones (Figures 10, 13b-d). The anterior abdominal region usually has from 3 to 8 transverse rows of low avicular hooks (14 rows on one specimen) (Figures 8, 13i); the first row may contain as many as 116 individual hooks, their numbers decreasing progressively. One individual with 6 rows showed the following sequence: 104; 75; 58; 26; 8; and 5. The hooks are accompanied by up to 5 short capillary setae (Figure 13e). Posterior to the region of hooks the limbate capillary setae are similar, but shorter; in the posterior region they are blunt and brushlike (Figure 13f-h). The last 2 to 4 brushlike setae may be accompanied by from 1 to 3 tall, long-necked hooks (Figure 13j). As many as 37 obscured segments are reflected by the 37 fascicles observed along the length of the body of one specimen.