Alteutha wanae, Song & Chullasorn, 2025
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publication ID |
https://doi.org/10.5281/zenodo.16967477 |
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persistent identifier |
https://treatment.plazi.org/id/03EF9849-122C-6C5D-FCEC-FDD2F91898FE |
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treatment provided by |
Felipe |
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scientific name |
Alteutha wanae |
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sp. nov. |
Alteutha wanae View in CoL sp. nov. ( Figs. 1-5 View Fig View Fig View Fig View Fig View Fig )
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F4C607F0AE79
Type locality. Lake Songjiho , Jukwang-myeon , Goseonggun, Gangwon-do, July 10, 1994 .
Material examined. Holotype: adult female ( NNIBR: NNIBRIV136397 ) dissected on 12 slides; adult male allotype ( NNIBR: NNIBRIV136396 ) dissected on 12 slides, 1 female and 1 male paratype ( NNIBR: NNIBRIV136394- 5 ) preserved in 70% ethanol.
Etymology. The specific name of Alteutha wanae sp. nov. is dedicated to first author’s wife Kyung Wan Kang. Additional materials. 3♀♀, Daejin, Yeongdeok-gun,
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Gyeongsangbuk-do, July 24, 1992; 1♀ (dissected) , Geumjin-ri , Yeongdeok-gun , Gyeongsangbuk-do, Sep. 25, 1998. 3♀♀, 2♂♂ , Dongdo, Dokdo Island , Ulleung-gun , Gyeongsangbuk-do, using light trap, July 14, 2021 .
Description of female. Habitus ( Fig. 1A View Fig ). Body length ranging from 0.86-0.92 mm (n = 5), measured from tip of rostrum to posterior margin of caudal ramus. Cephalothorax with scattered many sensilla on its surface as figured. Widest at posterior margin of cephalothorax. All somites of prosome ornamented with sensilla on surface and serrated distal margin.
Urosome ( Fig. 1A View Fig ) tapering posteriorly, 5-segmented, consisting of P5-bearing somite, genital double-somite, 2 free urosomites, and anal somite. Genital double-somite ( Figs. 1A View Fig , 5B View Fig ) wider than long, with transverse surface ridges dorsally and laterally, and ornamented with several sensilla on surface. P6 ( Fig. 5B View Fig ) represented by 2 bare setae on single plate over gonopores.
Caudal ramus ( Fig. 5A View Fig ) about 1.2 times as long as wide. Each ramus with 7 setae: seta I bare, arising from subdistal lateral surface; seta II strong and bipinnate, with normal base, inserted next to seta I; seta III slender and bare; seta IV and seta V well-developed, former bipinnate and latter multipennate; seta VI bare and shortest; seta VII bare, as long as seta VI, arising from subdistal dorsal surface between setae V and VI.
Rostrum ( Fig. 2A View Fig ) wide and rounded rectangular, cover- ed with numerous dents, with several setules on surface.
Antennule ( Fig. 2A View Fig ) 8-segmented; segment 1 ornament- ed with setules on anterior margin, with apinnate seta distally; segment 2 longest; segment 4 with aesthetasc fused to a seta, arising from pedestal; segment 5 shortest; distal 3 segments subequal in length. Setal formula as follows: 1-[1 pin], 2-[1 pin + 11 bare], 3-[8], 4-[3 + (1 + ae)], 5-[2], 6-[2], 7-[4], 8-[2], 9-[5 + acrothek].
Antenna ( Fig. 2B View Fig ) consisting of basis, two-segmented exopod and endopod. Basis longer than wide, ornamented with numerous small spinules anteriorly, with one bipinnate seta. Exopod two-segmented; first segment longer than second one, with several setules on outer margin and two bipinnate setae; second segment with 2 distal and 1 lateral bipinnate setae. Endopod 2-segmented; first segment with one bipinnate abexopodal seta on middle; second segment with many small spinules anterior surface and several spinuls on posterior surface distally, with hyaline frills on middle and subdistally. Subdistal armature consisting of 1 bare and 2 pinnate setae, and 1 serrate spine; distal armature consisting of 2 pinnate, 4 geniculate setae, and 1 serrate spine.
Mandible ( Fig. 2C View Fig ) gnathobase long well-developed with 9 distal cuspidate teeth and 1 bipinnate seta on dorsal corner as depicted. Palp consisting of basis, 1-segmented exopod, and 1-segmented endopod. Basis armed with many setules on surface, and with 2 setae. Exopod smaller than endopod, with 1 lateral and 2 distal bipinnate setae. Endopod with 1 lateral and 4 distal bipinnate setae.
Maxillule ( Fig. 2D, E View Fig ) arthrite of praecoxa well-developed, with 9 distal spines/setae (all pinnate distally) and 2 setae on surface. Coxa with several setules on outer margin. Coxal endite with 4 bipinnate setae; epipodite with 3 bipinnate setae. Basis elongate with 2 setular rows on surface, and with 6 elements (2 geniculate, 3 bare, and 1 strong bipinnate seta). Exopod one-segmented with 3 short bipinnate setae.
Maxilla ( Fig. 2F View Fig ) syncoxa with many setules along outer surface, and with 3 endites fused to syncoxa; proximal endite somewhat apart from others, covered with setules on surface and 1 bipinnate and 2 plumose setae distally; middle endite with 2 plumose setae, and distal endite with 3 plumose setae. Basis drawn into strong claw with 2 accessory setae; Endopod represented by small protrusion bearing 3 pinnate setae.
Maxilliped ( Fig. 2G View Fig ) subchelate, well-developed, prehensile. Praecoxa elongated and unarmed. Syncoxa armed with setular rows as depicted, and with 2 bipinnate subdistal setae. Basis with several setular rows and 1 small seta on palmar surface (arrow). Endopod shorter than basis and drawn out into strong, curved claw, accessory armature consisting of 1 bare seta.
P1 ( Fig. 3A View Fig ). Coxa longitudinally elongate, ornamented with spinular rows along both margins and on distal surface, and with a pore as figured. Basis transversally elongate, with setules on inner and outer margins and with a pore on subdistal outer surface; with inner and outer bipinnate seta. Exopod 3-segmented, much longer than endopod; exp-1 widened distally, with inner and outer spinules, and 1 outer bipinnate seta; exp-2 longer than exp-1, with setules along outer margin, 1 small outer bipinnate seta, and 1 pinnate inner seta; exp-3 small, with 1 geniculated seta and 4 strong, outwardly curved pinnate claws. Endopod 3-segmented and gradually narrowed; ornamented with setules on outer anterior surface, with 1 plumose inner seta; enp-2 with long setules on outer margin and with 1 bipinnate inner seta; enp-3 with long setules on outer margin, 1 outer, 2 distal, and 2 inner setae, all of which bipinnate.
P2 ( Fig. 3B View Fig , Table 1). Coxa wider than long, ornamented with long and short setules on outer margin and on anterior surface. Basis much wider than long, with several setules on outerodistal and on half proximal inner margin, and with 1 bare outer seta. Exopod with 3 segments, a little longer than endopod; exp-1 with setules on outer margin and anterior surface, with 1 bipinnate outer spine and 1 plumose inner seta; exp-2 with outer setules as in exp-1, with 1 bipinnate outer spine and 1 plumose inner seta; exp-3 with spinules and two pores as figured, 3 bipinnate outer spines, 2 terminal setae, and 2 plumose inner setae. Endopod with 3 subequal segments; enp-1 with outer long setules and 1 plumose inner seta; enp-2 with outer long setules and with 2 plumose inner setae; enp-3 with outer setules, and with 1 outer bipinnate seta, 2 distal bipinnate setae, and 2 inner plumose setae.
P3 ( Fig. 4A View Fig ). Coxa wider than long, with outer setules and one pore as figured. Basis much wider than long, with setules on outer margin, with 1 bare outer seta. Exopod with 3 segments, a little longer than endopod; exp-1 with setules on outer margin and anterior surface, with 1 bipinnate outer spine and 1 plumose inner seta; exp-2 with outer setules as in exp-1, with 1 bipinnate outer spine and 1 plumose inner seta; exp-3 with outer setules, 3 bipinnate outer spines, 2 terminal setae, and 3 plumose inner setae. Endopod with 3 subequal segments; enp-1 with outer long setules and 1 plumose inner seta; enp-2 with outer long setules and short setules on posterior surface and with 2 plumose inner setae; enp-3 with outer long setules and short setules on posterior surface, and with 1 outer bipinnate seta, 2 distal bipinnate setae, and 3 inner plumose setae.
P4 ( Fig. 4B View Fig ). Coxa wider than long, with setules and one pore as figured. Basis much wider than long, with setules on outer margin, with 1 bare outer seta. Exopod with 3 segments, a little longer than endopod; exp-1 with setules on outer margin, anterior and posterior surfaces, with 1 bipinnate outer spine and 1 plumose inner seta; exp-2 with setules as in exp-1, with 1 bipinnate outer spine and 1 plumose inner seta; exp-3 with setules as in exp-2, 3 bipinnate outer spines, 2 terminal setae, and 3 plumose inner setae (middle inner seta thicker than others). Endopod with 3 subequal segments; enp-1 with outer long setules and 1 plumose inner seta; enp-2 with outer long setules and short setules on posterior surface and with 2 plumose inner setae; enp-3 with outer long setules and short setules on posterior surface, and with 1 outer bipinnate seta, 2 distal bipinnate setae, and 2 inner plumose setae.
P5 ( Fig. 5C, D View Fig ). Both rami completely separated. Baseoendopod small, longer than wide, ornamented with tiny setules on outer distal half surface, with 1 long pinnate seta and 4 short setae. Exopod elongated as long as about 3 times, with many setules along outer surface, with 1 bare seta on middle (about 40% proximally), 3 apical strong spines with blunt tip and 1 spine bearing 1 setule and distally fused, and 1 sharp inner process bearing 1 setule.
Description of male. Total body length ranging from 0.77-0.85 mm (n = 6), measured as in the female specimen ( Fig. 1B View Fig ). Urosome tapering posteriorly. Cephalothorax a little wider than long, with lots of sensilla on surface as depicted.
Urosome ( Fig. 1B View Fig ) 6-segmented, comprising P5-bearing somite, genital somite, third to fifth urosomites, and anal somite. Each somite bearing setules along distal margin except for last two somites.
P6 ( Fig. 5G View Fig ) represented by 1 strong bipinnate spine with blunt tip.
Antennule ( Fig. 5E View Fig ) with 7 segments; segment 1 with long anterior setules and 1 bipinnate seta; segment 2 longest; segment 5 much swollen, with aesthetasc and seta fused basally. Setal formula as follows: 1-[1 bipinnate], 2-[1 pinnate + 11 bare], 3-[6 bare + (1 + ae)], 4-[2 bare], 5-[7 bare + (1 + ae)], 6-[1 bare + 1 serrate projection], 7-[2], 8-[11+ acrothek].
Antenna, mouth appendages, and P1, P2, P3, P4 as in female.
P5 ( Fig. 5F View Fig ). Both rami distinctly separated. Baseoendopod elongate, with setules on distal half as depicted, armed with 1 naked seta and 1 bipinnate seta. Exopod about 2 times as long as wide, with many setules along outer margin, and with 3 strong bipinnate distal spines with blunt tip, 2 bipinnate outer setae, and 1 bare seta on anterior surface (about 40% proximally).
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