Lissosabinea arthuri, Taylor & Collins, 2009

Taylor, Joanne & Collins, David J., 2009, New records of the shrimp genus Lissosabinea (Caridea: Crangonidae) from Australia including descriptions of three new species and a key to world species., Memoirs of Museum Victoria 66 (1), pp. 175-187 : 177-186

Lissosabinea arthuri sp. nov.

Figures 3–4 .

Lissosabinea tridentata . — Poore, 2004: 139.

Not Lissosabinea tridentata Pequegnat, 1970 : pp. — Dardeau & Heard, 1983: 29, fig. 15.

Type material. Holotype. Australia, Vic , (38°09.80' S, 149°41.71' E – 38°10.11' S, 149°41.01' E), 260–265 m, 22 Apr 2000 (stn SS01-2000 199), NMV J59767 (female specimen, cl. 7.3 mm) . Paratypes. Same locality as holotypes, NMV J52086 (2 male specimens, cl. 5.6 mm, 5.8 mm) .

Etymology. Named for the second authors grandfather, Arthur C. Collins. His extensive work on Australian foraminiferans unknowingly helped inspire a career.

Type locality. Victoria, Australia, 260–265 m.

Distribution. Known only from type location.

Description. Based on holotype female.

Rostrumdirectedforward, laterallycompressed, overreaching distal margin of first segment of antennular peduncle; distal part truncate, with deep ventral blade; dorsal surface with median ridge scattered with setae; lateral tooth strong, arising from 0.56 of rostrum; ventral margin straight, unarmed.

Carapace 1.70–1.80 times as long as wide. Middorsal carina sharp, extending nearly to posterodorsal margin of carapace, armed with two large teeth; epigastric tooth falling far short of base of rostrum arising at 0.24 of carapace length; second tooth arising from 0.57 of carapace length. Dorsal surface of carapace with few irregularly scattered setae. Antennal tooth small, not reaching anterior margin of cornea of eye. Branchiostegal tooth directed forward, falling short of anterior margin of antennal basicerite. Pterygostomian angle without tooth. Lateral face of carapace with relatively large hepatic and one post hepatic tooth, but epibranchial tooth absent; epibranchial carina conspicuous.

Fifth thoracic somite without sternal tooth in female.

Second abdominal somite smooth on dorsal surface. Third somite with middorsal carina in posterior 0.50; posterodorsal margin of somite strongly produced posteriorly, partially covering fourth somite. Sixth somite about 2.40 times as long as high; dorsal surface flat on midline. Telson with two pairs of minute dorsolateral spines; posterolateral angle with one short blunt spine and two pairs of longer spines (broken); terminal process pointed.

Antennular peduncle reaching 0.58 of antennal scale; stylocerite falling short of distal margin of first segment, spiniform. Antennal scale about 0.57 of carapace length and 2.72 times as long as wide, lateral margin straight, distal blade rounded; basicerite with ventrolateral spine reaching mid point of first segment of antennular peduncle.

Mouthparts not dissected.

First pereopod with palm about 3.20 times as long as wide; cutting edge of palm strongly oblique; pollex large, triangular, not recurved; carpus armed with two moderately large spines on lateral margin; merus with strong dorsodistal spine not reaching distal margin of anteriorly extended carpus, distolateral margin without tooth; ventral lamina terminating distally in subacute tooth. Second pereopod falling far short of mid-length of merus of first pereopod; dactylus about 0.38 length of propodus; propodus not widened distally. Third pereopod slender; ischium about 2.90 times as long as merus. Fourth pereopod moderately stout, overreaching antennal scale by length of dactylus and 0.30 of propodus; dactylus compressed laterally, about 0.45 times as long as propodus, propodus with distal tuft of setae; carpus 0.73 times as long as propodus; merus about seven times as long as wide, unarmed on dorsodistal margin; ischium 0.69 times as long as merus. Fifth pereopod similar to fourth, ischium 0.51 times as long as merus.

Colour. Unknown in life, faded in ethanol.

Remarks. In the paratype males the sternal tooth on the fifth thoracic somite is well developed extending beyond the base of spur on fourth somite. See remarks for L. beresfordi sp. nov.

Figures

Figure 3. Lissosabinea arthuri sp. nov., holotype female (cl. 7.3 mm), NMV J59767, Victoria Australia. A, entire animal in lateral view; B, carapace, dorsal view; C, first and second abdominal somites, dorsal view; D, third to sixth abdominal somites, dorsal view; E, telson and uropods, dorsal view; F, telson, dorsal view (magnified x 4.2 relative to F); G, left first pleopod (setae omitted); H, left second pleopod (setae omitted); I, left third pleopod (setae omitted).

Figure 4. Lissosabinea arthuri sp. nov., holotype female (cl. 7.3 mm), NMV J59767, Victoria Australia. A, subchela of right first pleopod, dorsal view; B, subchela of left first pleopod, lateral view; C, left second pereopod, lateral view; D, left second pereopod, lateral view (magnified x 2.0 relative to D); E, left third pereopod, lateral view; F, left fourth pereopod, lateral view; G, right fifth pereopod, lateral view.