Botryllophilus curtipes Kim & Boxshall 2021, sp. nov.
Creators: name: Kim, Il-Hoi
name: Boxshall, Geoff A.
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Maxillopoda
Cyclopoida
Ascidicolidae
Botryllophilus
Botryllophilus curtipes

description: Botryllophilus curtipes sp. nov.   
(Figs. 57-59)  
 Type material. Holotype ♀ (MNHN-IU-2018-1972, dissected and mounted on a slide) from budẚstçma renẚerẚ (Hartmeyer, 1912) (MNHN-IT-2008-4188 = MNHN A3 / EUD/281); Ibo Is., Mozambique, AURACEA 1995 cruise, Stn Pl 20, depth 6 m, Monniot coll., 16 November 1995.   
 Etymology. The specific name is from the Latin curt (=short) and pes (=a foot), referring to the short leg 5.   
 Description of female. Body (Fig. 57A) rather stout, consisting of broader anterior and narrower posterior parts; body length 1.10 mm. Anterior part of body broadening posteriorly, divisible by dorsal and lateral constrictions into cephalosome and 4 pedigerous somites; fifth pedigerous somite 388 μm wide, with convex lateral margins (Fig. 57B). Posterior part of body (Fig. 57B) consisting of genital and 4 abdominal somites, indistinctly defined from fifth pedigerous somite. Genital somite about 117×227 μm; genital apertures located dorsally. Four abdominal somites gradually narrowing posteriorly 89×188, 110×166, 105×141, and 154×114 μm, respectively. Caudal ramus (Fig. 57C) with short inner margin and much longer outer margin, armed with 4 claws and 1 seta; 1 outer distal claw rounded at tip.   
Rostrum absent. Antennule (Fig. 57D) small, 113 μm long, 4-segmented; first and second segments expanded; fourth segment with 2 traces of sutures on posterior side; armature formula 9 (3 large and 6 small), 4 (3 large and 1 small), 2 (1 large and 1 small), and 11+aesthetasc. Antenna (Fig. 57E, F) 4-segmented, including obscure coxa; basis and first endopodal segment unarmed; second endopodal segment of right antenna 3.2 times longer than wide (68×21 μm), armed with 7 setae; all setae shorter than segment, ornamented with several minute spinules at tip (Fig. 57E). Second endopodal segment of left antenna (Fig. 57F) slightly shorter (61×21 μm) than that of right antenna; setae unornamented, 2 outer distal setae 95 and 76 μm long, distinctly longer than segment.  
Labrum (Fig. 58A) broad, unornamented, with short posteromedial lobe. Mandible (Fig. 57G) with coxal gnathobase bearing distal bifurcate tooth and 2 short teeth on medial margin; palp with 9 setae, as usual for genus. Maxillule (Fig. 57H) with 6 setae on arthrite of precoxa; palp consisting of coxobasis and endopod; coxobasis with 2 medial and 3 outer setae and weakly pronounced distal lobe; endopod wider than long, distinctly articulated from coxobasis, armed with 3 setae. Maxilla (Fig. 57I) indistinctly 3-segmented with 3, 4, and 3 setae on first to third segments, respectively; distal seta on third segment naked and carried on digitiform process. Maxilliped (Fig. 58B) 4-segmented; syncoxa broad and unarmed; basis with 2 small setae; first endopodal segment unarmed; second segment slightly longer than first, with 1 small seta; terminal claw as long as second endopodal segment, bearing 2 minute denticles (proximal and subdistal).  
Legs 1-4 (Figs. 58 C-H, 59A, B) biramous, asymmetrical, with 1-segmented exopods and 2-segmented endopods; coxa unarmed; basis with 1 seta on outer margin and patch of spinules at inner distal corner. Inner subdistal seta on exopod of left leg 1 rudimentary. One seta on second endopodal segment of left leg 1 small. Second endopodal segment of right legs 2-4 armed with 1 spine in addition to setae. Numbers of spines (Roman numerals) and setae (Arabic numerals) on right and left legs 1-4 as follows:  
Leg 5 (Fig. 57A, B) small, lobate, about 1.3 times longer than wide (100×77 μm), with rounded distal margin; armed with 1 proximal and 3 distal setae, all small (shorter than leg segment). Leg 6 (Fig. 59C) represented by 1 spinule and 1 spinule-like process on genital operculum; several spinules on surface adjacent to leg 6.  
 Male. Unknown.   
 Remarks. The combination of armature on the exopods of right legs 1-4 (7-6-6-4) and left legs 1-4 (7-5-5-4) of B. curtẚpes sp. nov. is unique within Bçtryllçphẚlus. The combination of armature on the endopods of the right legs (7- 7-6-6) and left legs (8-7-6-6) of B. curtẚpes sp. nov. is also unusual; the former combination is shared only with B. mẚllarẚ and the latter combination is shared only with B. stenurçsus sp. nov. and B. pentachaetus sp. nov.
description: Published as part of Kim, Il-Hoi & Boxshall, Geoff A., 2021, Copepods (Cyclopoida) associated with ascidian hosts: Ascidicolidae, Buproridae, Botryllophilidae, and Enteropsidae, with descriptions of 84 new species, pp. 1-286 in Zootaxa 1 on pages 92-95, DOI: 10.11646/zootaxa.4978.1.1, http://zenodo.org/record/4820443