Acanthochondria zebriae Ju-Shey, 2000, sp. nov.
Creators: name: Ju-Shey
Publisher: name: Zenodo
Year: 2000
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Maxillopoda
Poecilostomatoida
Chondracanthidae
Acanthochondria
Acanthochondria zebriae

description: Acanthochondria zebriae sp. nov.   
(®gures 1±2)  
 Material examined. Twenty-four adult and three juvenile mm (19 with attached l) on gill ®laments of Zebrias synaturoide s (Gilchrist): four adults and three juveniles collected on 11 March 1994 and 20 adults collected on 26 December 1994. Holotype (USNM 285490) and eight paratypes (USNM 285491) 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 junior authors’ (IHK) collection.   
 Female. Body (®gure 1A) elongated and cylindrical, measuring 1.69±1.94 mm long. Head (®gure 1B) longer than wide, 403Ö 273 m m (not including ināted antennule), with small rounded knob at each anterolateral corner and ventrally protruded oral region (®gure 1C). First pediger narrower than head. Second pediger with remaining prosomal somites fused into a long, cylindrical trunk bearing a pair of posterolateral processes (®gures 1D, E). Genital double somite slightly longer than wide, 135Ö 123 m m, and abdomen distinctly wider than long, 37Ö 65 m m. Caudal ramus (®gure 1D) a spiniform, pointed process bearing four setae. Egg sac about as long as trunk.   
Antennule (®gure 1F) ¯eshy and ināted; armature being (from proximal to distal) 1-1-2-2-2-7. Antenna (®gure 1G) two-segmented; terminal segment sharply curved and covered with minute tubercles on terminal area of basal half before bend. Labrum with smooth, straight posterior margin. Mandible (®gure 1H) twosegmented; terminal blade with 31 to 33 teeth on convex (inner) side and 28 to 32 teeth on concave (outer) side. Paragnath (®gure 1I) a small spinulose lobe. Maxillule (®gure 1J) with two terminal elements. Maxilla (®gure 1K) two-segmented; ®rst segment robust and unarmed; second segment bearing one small, simple, basal seta, one large seta with hyaline tip and a row of 22 to 29 teeth on terminal process. Maxilliped (®gure 2A) three-segmented; ®rst segment largest but unarmed, second segment with long spines on greatly protruded inner distal corner, and terminal segment reduced to a small hook situated opposite to tuft of spinules on inner-distal corner of second segment. Both leg 1 (®gure 2B) and leg 2 (®gure C) nearly unilobate, with ināted, bluntly pointed exopod continuous with protopod and carrying a much reduced endopod tipped with a seta. Terminal region of exopod with six setae on leg 1 and four setae on leg 2.  
 Male. Body (®gure 2D) 217 m m long, with swollen cephalosome and cylindrical metasome and urosome. Genital somite (®gure 2E) with usual ventrolateral ridges. Abdomen (®gure 2E) indistinguishably fused with genital segment. Caudal ramus as in female but naked. Antennule reduced to a simple seta (see ®gure 2D). Antenna (®gure 2F) with small seta on basal segment and a conical process on basal part of terminal hook. Mandible (®gure 2G) with fewer teeth on terminal blade, 17 on convex side and ten on concave side. Maxilla (®gure 2H) with eight or nine teeth on inner side and single one on outside of terminal process. Maxilliped (®gure 2I) essentially as in female, but terminal claw relatively larger. Leg 1 (®gures 2D, J) reduced to a simple spiniform seta. Leg 2 absent.   
 Etymology. The speci®c name zebriae refers to the host of the present species.   
 Remarks. According to Ho and Kim’s (1995) designation of the variable appendages useful in species identi®cation in the genus Acanthochondria, the antennule of the new species belongs, undoubtedly, to Type G±I, but its legs do not ®t well to any of the ®ve types. Basically, the legs of A. zebriae are attributable to Type A, but no species of Acanthochondria with Type A leg has its endopods on both legs 1 and 2 reduced to a small knob as in the present species. Furthermore, no species of Acanthochondria has the male with leg 2 missing and leg 1 reduced to a spiniform seta. The subchelate female maxilliped is another unusual feature of the present 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 page 711, DOI: 10.1080/002229300299372, http://zenodo.org/record/10083161