Enterocola tuberculatus Kim &amp; 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
Enterocola
Enterocola tuberculatus

description: <i>Enterocola tuberculatus</i> sp. nov. (Figs. 142, 143) <b>Type material.</b> Holotype &amp;female; (MNHN-IU-2014-21554) and 1 &amp;female; paratype (dissected, MNHN-IU-2014-21472) from <i>mçlysyncratçn cerebellum</i> Monniot F. &amp; Monniot C., 2001 (MNHN-IT-2008-7078 = MNHN A2 / POL/96); Papua New Guinea, CRCHO 262, Brooker Ils., Louisiades, Site Brooker CH (11°03.09’S, 152°28.62’E) depth 12 m, CRRF coll., 01 June 1998. <b>Etymology.</b> The specific name alludes to the presence of a large dorsal tubercle on the first pedigerous somite of the new species. <b>Description of female.</b> Body (Fig. 142 A-C) eruciform, curved dorsally; body length 760 μm, maximum width 244 μm (across cephalic shield). Cephalic shield with obscure posterior margin. First pedigerous somite with weak tergal folds posterolaterally, but with large mid-dorsal projection (Fig. 142A); second to fourth pedigerous somites each with pair of large, lamellate dorsolateral tergal folds and single, broad ventral interpodal protrusion between left and right legs. Genitoabdomen (Fig. 142D) short, unsegmented dorsally, but 4-segmented ventrally, with distinct anal prominence. Caudal rami elongate, unarmed, originating close to each other; each ramus (Fig. 142D) about 3.5 times longer than wide (102×29 μm), slightly broadened proximally, with rounded distal margin. Rostrum absent. Antennule (Fig. 142E) unsegmented, more than twice as long as wide (approximately 39×18 μm), with rounded distal margin, nearly parallel anterior and posterior margins; armed with 5 small setae at antero- distal corner. Antenna (Fig. 142F) incompletely 2-segmented, 2.34 times longer than wide (103×44 μm); proximal segment unarmed; distal segment as long as, but narrower than, proximal segment, and ornamented with fine spinules on concave surface; armed with 5 setae, lengths of setae I-V 17, 12, 12, 17, and 25 μm; medial seta (seta I) spinulose and distinctly thicker than other 4 setae; setae II and III positioned close to each other. Labrum destroyed; palp (Fig. 142G) spinulose, bulbous, markedly inflated in distal half. Mandible (Fig. 142H) spinulose, slender, much narrower than labral palp. Maxillule as usual for genus; distal sclerotized part of precoxa (Fig. 142I) weakly bilobed; endite of precoxa tipped with 1 spinulose spine and more than 10 stiff setules; palp (Fig. 142K) armed with 5 spines on distal margin and 1 naked seta on lateral margin. Maxilla (Fig. 142L) 2-segmented; proximal segment with unarticulated, spinulose mediodistal process; distal segment distally bifurcate, with 1 minute seta proximally on posterior surface. Maxilliped absent. Legs 1-4 (Fig. 142M; 143 A-C) each consisting of incompletely 2-segmented protopod and unsegmented rami; protopods unarmed. Exopods of legs 1, 2, and 4 with pointed distal tip and minute cusp subdistally on lateral margin; exopod of leg 3 elongate (Fig. 143B) and thin distally. Endopods 51×35, 48×22, 55×27, and 48×20 μm, respec- tively, in legs 1-4. Enodpods of legs 3 and 4 with convex lateral margin. Lengths of laterodistal and mediodistal setae on endopods 68 and 49, 59 and 47, 65 and 52, and 68 and 59 μm, respectively, in legs 1-4. Laterodistal setae on endopods longer than endopodal segments, 1.39, 1.26, 1.25, and 1.15 times longer than mediodistal setae on legs 1-4, respectively. Leg 5 (Fig. 143D) unarmed, wider than long (98×167 μm). <b>Male.</b> Unknown. <b>Remarks.</b> The most conspicuous feature of <i>b</i>. <i>tuberculatus</i> <b>sp. nov.</b> is the presence of a large dorsal tubercle on the first pedigerous somite, which serves to differentiate the new species from its congeners. The presence of any dorsal tubercles or projections has been recorded in only three species: there is a tapering posterior projection on the cephalic shield in <i>b</i>. <i>dẚcaudatus</i> (see Marchenkov &amp; Boxshall, 2005), there are 2 tubercles (one each on the second and third pedigerous somites) in <i>b</i>. <i>quadrẚsetus</i> <b>sp. nov.</b>, and 2 tubercles (one each on the cephalosome and first pedigerous somite) in <i>b</i>. <i>parvus</i> <b>sp. nov.</b> The caudal rami of <i>b</i>. <i>tuberculatus</i> <b>sp. nov.</b> are elongate, 3.2 times longer than wide. This is another potential diagnostic feature of the new species, because in other species of <i>bnterçcçla</i> the length/width ratio of the caudal rami seldom exceeds 3.0. The exceptions are <i>b</i>. <i>bẚlamellatus</i> Sars, 1921, <i>b</i>. <i>dẚcaudatus</i>, <i>b</i>. <i>quadrẚsetus</i> <b>sp. nov.</b>, and <i>b</i>. <i>rçbustus</i> <b>sp. nov.</b> all of which have caudal rami with a length to width ratio of about 3. These four species are easily separated from <i>b</i>. <i>tuberculatus</i> <b>sp. nov.</b> by their lack of a dorsal tubercle on the first pedigerous somite. The antenna of <i>bK tuberculatus</i> <b>sp. nov.</b> is armed with 5 setae. This feature is shared with some varieties of <i>b</i>. <i>fulgens</i> and by four other species, <i>b</i>. <i>adnatus</i>, <i>b</i>. <i>latẚceps</i>, <i>b</i>. <i>parapterçphçrus</i>, and <i>b</i>. <i>mabulensẚs</i> <b>sp. nov.</b> (Table 6). All of these species also lack any dorsal tubercles or projections.
description: Published as part of <i>Kim, Il-Hoi &amp; 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</i> on pages 219-221, DOI: 10.11646/zootaxa.4978.1.1, http://zenodo.org/record/4820443
description: {"references": ["Marchenkov, A. &amp; Boxshall, G. A. (2005) Three new species of bntercccla van Beneden, 1860 (Crustacea: Copepoda: Cyclopoida) from ascidian hosts. Systemat \u1e9ac maras \u1e9atclcgy, 61, 223 - 234. http: // doi. org / 10.1007 / s 11230 - 005 - 3171 - 5", "Sars, G. O. (1921) An acccunt cf the Crustacea cf kcrway w \u1e9ath shcrt descr \u1e9apt\u1e9acns and f \u1e9agures cf all the spec \u1e9aesK sclK 8 K CcpepcdaK Mcnstr \u1e9allc\u1e9ada and kctcdelphyc \u1e9ada. Bergen Museum, Bergen, 91 pp., 37 pls."]}