Bactrochondria papilla Ju-Shey, 2000, sp. nov.
Creators: name: Ju-Shey
Publisher: name: Zenodo
Year: 2000
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Maxillopoda
Cyclopoida
Chondracanthidae
Bactrochondria
Bactrochondria papilla

description: Bactrochondria papilla sp. nov.   
(®gures 3±4)  
 Material examined. Twenty-seven adult mm (each with attached l) found on gill ®laments of Cynoglossus dubius (Regan): eight collected on 14.ii.1994 and 19 collected on 20 July 1994. Holotype (USNM 285492) and ten paratypes (USNM 285493) have been deposited in the US National Museum of Natural History, Smithsonian Institution, Washington, DC, and the remaining paratypes and other specimens kept in the author’s (IHK) collection.   
 Female. Body (®gure 3A) greatly elongated and cylindrical, 2.52±4.56 mm long and 0.37±0.52 mm wide. Head (®gure 3B) longer than wide, 0.60Ö 0.37 mm (not including ināted antennule), with prominent cephalic process (a swollen base tipped with a nipple-like protrusion) at each anterolateral corner (®gures 3C, F). Neck region formed by ®rst pediger, remaining prosomal somites fused into a long, cylindrical trunk. Genital double somite indistinguishably fused to trunk (®gures 3A,D), carrying a central vermiform process on ventral side. Abdomen like a narrow ring attached to genital double somite (®gure 3D). Caudal ramus (®gure 3D) a pointed spiniform process carrying three setae and one tubercle. Longest egg sac 8.64 mm long, nearly twice as long as its body length.   
Antennule (®gure 3E) with ināted base and cylindrical tip; armature being (from proximal to distal) 1-1-2-1-7. Antenna (®gure 3F) two-segmented; terminal segment an uncinate hook. Labrum (®gure 3G) with smooth posterior margin. Mandible (®gure 3H) two-segmented; terminal blade with 21 to 27 teeth on convex (inner) side and 12 to 16 teeth on convex (outer) side. Maxillule (®gure 3I) with three blunt, terminal setae. Maxilla (®gure 3J) two-segmented; ®rst segment robust but unarmed; second segment bearing one small, simple, basal seta, one large seta with hyaline tip and a row of seven to nine teeth along inner edge of terminal process. Maxilliped (®gure 4A) three-segmented; ®rst segment largest but unarmed, second segment expanded distally with enlarged inner corner armed with two patches of denticles, and terminal segment reduced to a small claw attached to non-swollen outer distal corner of second segment. Leg 1 (®gure 4B) with greatly enlarged, process-like protopod carrying an outer basal seta and much reduced, knob-like rami. Endopod unarmed, but exopod tipped with ®ve short setae, four terminal and one subterminal. Leg 2 (®gure 4C) biramous; protopod largely fused to trunk and only identi®able by its outer, basal seta. Both rami rod-like, with exopod larger than endopod and tipped with four short setae, three terminal and one subterminal.  
 Male. Body (®gure 4D) 388 m m long, cephalosome moderately swollen. Genital somite (®gure 4E) with prominent ventrolateral ridges but abdomen small and indistinct. Caudal ramus (®gure 4E) a spiniform process bearing a medial seta and a ventral tubercle at base. Antennule (®gure 4F) elongate and cylindrical, with terminal portion set oOE in a posteroventrally directed knob; armature being 1-1-1- 2-8. Antenna (®gure 4G) a strongly recurved hook bearing an inner setule. Mandible (®gure 4H) with fewer teeth on terminal blade, 14 on convex side and seven to eight or concave side. Paragnath (®gure 4I) a spinulose lobe. Maxillule (®gure 4J) with two terminal elements. Maxilla (®gure 4K) with seven teeth on inner surface of terminal process. Maxilliped (®gure 4L) with much reduced, terminal claw visible in lateral view only (®gure 4M). Leg 1 (®gure 4N) reduced to a seta and a tiny knob tipped with two setules and a small tubercle, or only two setules (®gure 4O).   
 Etymology. The speci®c name papilla is Latin (= nipple, teat, bud), it refers to the reduction of the endopod on leg 2 to a bud-like structure.   
 Remarks. The new species can be distinguished from its two congeners by the following three characters:   
 Since Yamaguti (1939) failed to describe the ®ne structures of B. longitruncus, it is impossible to point out if there are further diOEerences among these three species. However, more diOEerences from B. hoi are given after the redescription of that species.
description: Published as part of Ju-Shey, 2000, Chondracanthid copepods parasitic on flatfishes of Kerala, India, pp. 709-735 in Journal of Natural History 34 (5) on pages 714-717, DOI: 10.1080/002229300299372, http://zenodo.org/record/10083161