Ancylomenes kuboi Bruce 2010, sp. nov.
Creators: name: Bruce, A. J.
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Palaemonidae
Ancylomenes
Ancylomenes kuboi

description: <i>Ancylomenes kuboi</i> sp. nov. (Figs. 1–2) <b>Material examined.</b> (i) 1 holotype female, 1 male paratype, 1 sex unknown, CLs 3.0, 3.5 mm, FRV <i>Soela</i>, stn NWS–17, B4, Northwest Shelf, Western Australia, 19°05.3’S, 118°53.8’E, 80 m, beam trawl, 26 April 1983, NTM Cr015049; (ii) 1 female paratype, CL 2.2 mm, FRV <i>Soela</i>, stn NWS–15, B4, Northwest Shelf, Western Australia, 19°05.4’S, 118°53.3’E, 80 m, epibenthic sledge, 27 April 1983, NTM Cr015054. <b>Additional, non-type material examined:</b> (iii) 1 male, CL 2.2 mm; 1 female, CL 3.7 mm, FRV <i>Soela</i>, stn NWS-23, B4, Northwest Shelf, Western Australia, 19°03.5’S 119°03.1’E, 82 m, epibenthic sledge, 28 April 1983, NTM Cr.015047; (iv) 1 ov. female, CL 2.8 mm, FRV <i>Soela</i>, stn BT–10, Northwest Shelf, Western Australia, 19°04.6’S, 118°57.9’E, 81 m, beam trawl, 30 June 1983, NTM Cr 015052; (v) 3 males, 1 ov. female, CL 2.7, 2.4, 2.0; 3.3 mm, Nha Trang Bay, Vietnam, scuba, 9.2 m, 5 September 2008, leg. Z. &amp;Dcaron; uriš &amp; I. Horká, #122A, on <i>Actinodendron</i> sp., QM W28917. <b>Diagnosis</b>. A species of <i>Ancylomenes</i> closely resemblin <i>g</i> <i>A. tosaensis</i> (Kubo, 1951). R, 1+6–8/1; third abdominal tergite posteriorly feebly produced, bluntly subcarinate; with small angular interocular process; second pereiopod with fingers completely edentate, without proximal diastema, sparsely setose, subequal to palm length, carpus longer than palm; ambulatory propodi with slender simple dactyli, about 0.3 of propodus length, 9.5 times longer than basal width, propodus with single short terminal distoventral spine about 0.05 of dactylus length. <b>Description</b>. A typical member of the genus <i>Ancylomenes</i> Okuno &amp; Bruce, 2009. Rostrum (Figs. 1A–B) reaching to about distal margin of proximal segment of antennular peduncle, about 0.68 of CL, slightly arched, at about 8° to longitudinal carapace axis, dorsal carina well developed, convex, extending onto anterior carapace, with 7–9 small acute teeth, posterior tooth on carina, posterior to orbital margin, well separated from second tooth, more anterior teeth closer, ventral margin feebly concave, densely setose, with small acute preterminal tooth; inferior orbital angle acutely produced, with well developed ventral flange, antennal spine marginal, well below inferior orbital angle level, hepatic spine lower still, anterior to level of epigastric spine; third abdominal tergite posterodorsally produced, bluntly carinate, rounded or slightly angular in profile, second pereiopod (Fig. 1C) exceeding antennular peduncle by carpus and chela, chela (Fig. 1D) about 0.85 of CL, palm oval in section, about 3.2 times longer than depth, fingers (Fig. 1E) subequal to palm length, dactylus slender, about 6.3 times longer than proximal depth, with strongly hooked tip, cutting edge laminar, without teeth, fixed finger similar, carpus about 1.5 times palm length, merus subequal to carpal length, ischium 1.25 times carpal length; third pereiopod with dactylus (Fig. 1G) about 0.38 of propodus length, slender, 9.5 times longer than basal width, unguis about 0.3 of corpus length, corpus without distal accessory tooth, propodus (Fig. 1F) about 0.75 of CL, feebly bowed, about 17.0 times longer than depth, sparsely setose, with single, very small, distoventral spine (Fig. 1H) only, length about 0.5 of the distal propodus width. <b>Measurements</b> (mm). Holotype female, postorbital carapace length, 3.6; carapace and rostrum, 6.0; total body length, (approx.) 21.0; second pereiopod chela, 3.0. <b>Systematic position</b>. Most closely related to <i>A. tosaensis</i> (Kubo, 1951), and <i>A. okunoi</i> sp. nov., the only other Indo-West Pacific species of the genus <i>Ancylomenes</i> group known to have simple ambulatory dactyli. All other species of this group have biunguiculate dactyli, although in some species the accessory tooth may be relatively small. <i>Ancylomenes kuboi</i> sp. nov. is readily distinguished from both these species by the very short distoventral spines on the ambulatory propodi. <b>Host</b>. The specimens from Vietnam were found in association with <i>Actinodendron</i> sp. [Actiniaria]. <b>Colouration</b>. The colouration of the Vietnamese specimens is illustrated in Fig. 2. Field notes for specimen (i) are: third abdominal segment with submedian red dorsal spots outlined in white on the anterior portion, posterior region with carina white with red apical spot; rostrum transparent; second pereiopods with palm with distal two thirds yellow, proximal third whitish, fingers deep purple, carpus with distal third whitish, proximal two thirds ventrolaterally purple. <b>Etymology</b>. The specimen is named in honour of Prof. Itsuo Kubo (1909-1968), of the Tokyo University of Fisheries, Japan, in recognition of his studies on pontoniine shrimp, including the original description of <i>Periclimenes tosaensis</i>. <b>Remarks</b>. A full illustrated description is not provided as this species conforms so closely to <i>A. tosaensis</i> and the other species of <i>Ancylomenes</i>. The salient features outlined above should enable it to be readily recognised. The Northwest Shelf specimens are not in good condition. All specimens except one have intact rostra. The female holotype specimen (i) and the paratype (ii) each have a single second pereiopod. The third specimen lacks much of the abdomen. The holotype and (ii) also lack the posterior half of the telson. Only the female (iv), CL 2.8 mm, is ovigerous, with ova of normal length, about 0.5 mm. The Vietnamese specimens are in good condition with intact rostra, the female, CL 3.3, has a dentition of 1+7/1 and the males, CLs 2.7, 2.4 and 2.0, have 1 +6/1, the female and two males have both second pereiopods.
description: Published as part of <i>Bruce, A. J., 2010, Ancylomenes kuboi and A. okunoi spp. nov. (Decapoda: Pontoniinae), from the Australian Northwest Shelf, Vietnam and the Philippines *, pp. 169-176 in Zootaxa 2372 (1)</i> on pages 170-171, DOI: 10.11646/zootaxa.2372.1.17, http://zenodo.org/record/5305309
description: {"references": ["Kubo, I. (1951) Some macrurous decapod crustacea found in Japanese waters, with descriptions of four new species. Journal of Tokyo University of Fisheries, 38, 259 - 289."]}