Botryllophilus curtipes, Kim & Boxshall, 2021

Kim, Il-Hoi & Boxshall, Geoff A., 2021, Copepods (Cyclopoida) associated with ascidian hosts: Ascidicolidae, Buproridae, Botryllophilidae, and Enteropsidae, with descriptions of 84 new species, Zootaxa 1, pp. 1-286 : 92-95

publication ID	https://doi.org/ 10.11646/zootaxa.4978.1.1
publication LSID	lsid:zoobank.org:pub:9C7C1723-73EB-4FBE-A47A-54627DEB8F93
DOI	https://doi.org/10.5281/zenodo.5582598
persistent identifier	https://treatment.plazi.org/id/3729879B-FFBE-FFA9-FA93-FECDD133192F
treatment provided by	Plazi
scientific name	Botryllophilus curtipes
status	sp. nov.

Treatment

Botryllophilus curtipes sp. nov.

( Figs. 57-59 View FIG View FIG View FIG )

Type material. Holotype ♀ (MNHN-IU-2018-1972, dissected and mounted on a slide) from budẚstçma renẚerẚ (Hartmeyer, 1912) (MNHN-IT-2008-4188 = MNHN A3 About MNHN / 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 View FIG ) 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 View FIG ). Posterior part of body ( Fig. 57B View FIG ) 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 View FIG ) 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 View FIG ) 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 View FIG ) 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 View FIG ). Second endopodal segment of left antenna ( Fig. 57F View FIG ) 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 View FIG ) broad, unornamented, with short posteromedial lobe. Mandible ( Fig. 57G View FIG ) 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 View FIG ) 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 View FIG ) 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 View FIG ) 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 View FIG 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 View FIG ) 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 View FIG ) 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.