Linguimaera garitima Krapp-Schickel, 2003, sp. nov.

Linguimaera garitima sp. nov. Figures 5–7 Material examined. Holotype. Australia. Tasmania, eastern Bass Strait, 82 km ENE of North Point, Flinders I. (39˚27.7´S, 148˚41.4´E), 293 m, coarse sand, naturalist’s dredge, G.C.B. Poore on HMAS Kimbla, 28 Mar 1979 (stn BSS 36), NMV J52321 (1 male 7 mm). Paratype. Collected with holotype, NMV J52322 (1 female 7 mm). Other material. Collected with holotype, NMV J20371 (8 males, 16 females 17 juveniles). Diagnosis. Similar to L. leo sp. nov. but: body smaller, articles narrower, coxa 1 anterodistally more lengthened and anteriorly excavated, gnathopod 1, 2 propodus rectangularly narrow, setae long, gnathopod 2 male the smaller ones similar to gnathopod 2 female in totally lacking palmar tooth; pereopod 7 basis about twice as long as wide. Telson about as long as wide, distal strong robust seta between half and two thirds of telsonlength. Description. Adult male, female 5.5–8 mm. Head: lateral cephalic lobes rounded, anteroventral corner rectangular. Eyes more than twice as long as large, upper part narrowed. Antenna 1 peduncle scarcely longer than flagellum, peduncle article1 shorter than article 2; flagellum of up to 34 articles, accessory flagellum of 6 articles; antenna 2 gland cone short, article 4 longer than article 5, flagellum subequal to peduncle article 5, of 9 articles. Mandibular palp article 1 longer than wide; article 2: article 3 = 1.6, both with long setae, article 3 also distally. Coxa 1 anterodistally acute and anteriorly excavated; gnathopod 1 propodus narrow, more than twice as long as wide. Gnathopod 2 of female with narrow and long propodus lacking a defining tooth on the palmar corner, with palm oblique, crenulate. Gnathopod 2 of male propodus palm almost transverse, blunt robust defining tooth on (about rectangular) palmar corner; ratio of propodi gnathopod 1: gnathopod 2 = 0.5. Pereopods 3, 4 merus not widened; female pereopod basis narrower. Uropod 1 peduncle as long as rami.. Uropod 3 rami with thinner robust setae. Telsonic lobes with long robust seta which is clearly longer than half telsonlength. Etymology. During my stay at Museum Victoria, Melbourne, Gary Poore and Tim O’Hara were extremely helpful on many occasions, and furthermore were strongly involved in the collection of the material. The specific epithet is a combination of their names and expresses my gratitude; used as an adjective. Distribution. Bass Strait, coarse shell, 293 m. Discussion. This clade seems strikingly conservative and though checking very thoroughly, there are not many easy characters separating this species from the much shallower L. leo (if not dealing with mature males), except: much greater depth, smaller body size, mandibular palp ratio article 2 to article 3 longer (1.65 vs 1.8 in L. leo), palmar corner of male gnathopod 2 with about right angle (vs oblique) and (most reliable character) a long robust seta on telsonic lobes (much shorter in L. leo).滨海舌形虫（Linguimaera garitima）新种 图5—7 检视标本。正模标本：澳大利亚塔斯马尼亚州巴斯海峡东部，弗林德斯岛诺斯角东北偏东82公里处（39°27.7′S，148°41.4′E），水深293米，粗砂底，自然历史拖网采集，G.C.B.普尔搭乘HMAS Kimbla号舰艇采集，1979年3月28日（站位BSS 36），标本号NMV J52321（1只雄性，体长7毫米）。 副模标本：与正模同批采集，标本号NMV J52322（1只雌性，体长7毫米）。 其他标本：与正模同批采集，标本号NMV J20371（8只雄性、16只雌性及17只幼体）。 鉴别特征：与L. leo（Linguimaera leo）新种近似，但存在以下差异：体型更小，体节更窄；第一底节前腹角更延长且前缘凹陷；第一、第二腮足掌节呈窄矩形，刚毛较长；雄性第二腮足较小个体与雌性第二腮足类似，完全不具掌齿；第七步足基节长约为宽的2倍。尾节长约与宽相等，末端粗壮刚毛长度约为尾节总长的1/2至2/3。 形态描述：成体雄、雌体长5.5~8毫米。 头部：侧头叶圆形，前腹角呈矩形。眼长约为宽的2倍以上，上部收窄。第一触角柄节略长于鞭节，柄节第一节短于第二节；鞭节最多由34节组成，副鞭节具6节；第二触角腺锥短小，第四节长于第五节，鞭节与柄节第五节近等长，具9节。大颚须第一节长大于宽；第二节与第三节长度比为1.6，两节均具长刚毛，第三节末端亦具刚毛。第一底节前腹角尖锐且前缘凹陷；第一腮足掌节狭长，长约为宽的2倍以上。 雌性第二腮足掌节狭长，掌角无界定齿，掌缘斜向且具细锯齿。雄性第二腮足掌节掌缘近横直，掌角（近矩形）具钝而粗壮的界定齿；第一腮足与第二腮足掌节长度比为0.5。 第三、第四步足长节不膨大；雌性步足基节较窄。第一尾足柄节与内、外肢等长。第三尾足内、外肢具较细的粗壮刚毛。尾节叶具长粗壮刚毛，其长度明显超过尾节总长的一半。 词源：笔者在墨尔本维多利亚博物馆访学期间，Gary Poore与Tim O’Hara多次提供了极为重要的帮助，二人亦深度参与了本次标本的采集工作。本种加词由二人姓名组合而成，以表达笔者的感激之情，作为形容词使用。 分布：巴斯海峡，粗贝壳质底，水深293米。 讨论：该演化支形态极为保守，尽管经过细致检视，除以下特征外，难以找到易于区分该种与栖息环境更浅的L. leo（若非针对成熟雄体）的鉴别性状：栖息水深更深、体型更小、大颚须第二节与第三节长度比更大（本种为1.65，L. leo为1.8）、雄性第二腮足掌角近直角（L. leo为斜向），以及（最可靠的性状）尾节叶具长粗壮刚毛（L. leo的该刚毛短得多）。